NO762498L - - Google Patents
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- Publication number
- NO762498L NO762498L NO762498A NO762498A NO762498L NO 762498 L NO762498 L NO 762498L NO 762498 A NO762498 A NO 762498A NO 762498 A NO762498 A NO 762498A NO 762498 L NO762498 L NO 762498L
- Authority
- NO
- Norway
- Prior art keywords
- additive
- concrete
- carboxyl group
- mortar
- weight
- Prior art date
Links
- 239000000654 additive Substances 0.000 claims description 35
- 239000004567 concrete Substances 0.000 claims description 26
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 24
- 150000004676 glycans Polymers 0.000 claims description 24
- 229920001282 polysaccharide Polymers 0.000 claims description 24
- 239000005017 polysaccharide Substances 0.000 claims description 24
- 230000000996 additive effect Effects 0.000 claims description 22
- 239000004570 mortar (masonry) Substances 0.000 claims description 22
- 239000004568 cement Substances 0.000 claims description 8
- 150000004675 formic acid derivatives Chemical class 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 150000004804 polysaccharides Polymers 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000011148 porous material Substances 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 6
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 235000012208 gluconic acid Nutrition 0.000 description 5
- 239000000174 gluconic acid Substances 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 4
- 150000001805 chlorine compounds Chemical class 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000004014 plasticizer Substances 0.000 description 4
- 235000013339 cereals Nutrition 0.000 description 3
- 238000001033 granulometry Methods 0.000 description 3
- 230000003301 hydrolyzing effect Effects 0.000 description 3
- 229920005610 lignin Polymers 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- -1 so-called "gums" Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010525 oxidative degradation reaction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229920001277 pectin Polymers 0.000 description 2
- 239000001814 pectin Substances 0.000 description 2
- 235000010987 pectin Nutrition 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 2
- 241001504564 Boops boops Species 0.000 description 1
- 229920002101 Chitin Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 229920001202 Inulin Polymers 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 244000061456 Solanum tuberosum Species 0.000 description 1
- 235000002595 Solanum tuberosum Nutrition 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- JYJIGFIDKWBXDU-MNNPPOADSA-N inulin Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)OC[C@]1(OC[C@]2(OC[C@]3(OC[C@]4(OC[C@]5(OC[C@]6(OC[C@]7(OC[C@]8(OC[C@]9(OC[C@]%10(OC[C@]%11(OC[C@]%12(OC[C@]%13(OC[C@]%14(OC[C@]%15(OC[C@]%16(OC[C@]%17(OC[C@]%18(OC[C@]%19(OC[C@]%20(OC[C@]%21(OC[C@]%22(OC[C@]%23(OC[C@]%24(OC[C@]%25(OC[C@]%26(OC[C@]%27(OC[C@]%28(OC[C@]%29(OC[C@]%30(OC[C@]%31(OC[C@]%32(OC[C@]%33(OC[C@]%34(OC[C@]%35(OC[C@]%36(O[C@@H]%37[C@@H]([C@@H](O)[C@H](O)[C@@H](CO)O%37)O)[C@H]([C@H](O)[C@@H](CO)O%36)O)[C@H]([C@H](O)[C@@H](CO)O%35)O)[C@H]([C@H](O)[C@@H](CO)O%34)O)[C@H]([C@H](O)[C@@H](CO)O%33)O)[C@H]([C@H](O)[C@@H](CO)O%32)O)[C@H]([C@H](O)[C@@H](CO)O%31)O)[C@H]([C@H](O)[C@@H](CO)O%30)O)[C@H]([C@H](O)[C@@H](CO)O%29)O)[C@H]([C@H](O)[C@@H](CO)O%28)O)[C@H]([C@H](O)[C@@H](CO)O%27)O)[C@H]([C@H](O)[C@@H](CO)O%26)O)[C@H]([C@H](O)[C@@H](CO)O%25)O)[C@H]([C@H](O)[C@@H](CO)O%24)O)[C@H]([C@H](O)[C@@H](CO)O%23)O)[C@H]([C@H](O)[C@@H](CO)O%22)O)[C@H]([C@H](O)[C@@H](CO)O%21)O)[C@H]([C@H](O)[C@@H](CO)O%20)O)[C@H]([C@H](O)[C@@H](CO)O%19)O)[C@H]([C@H](O)[C@@H](CO)O%18)O)[C@H]([C@H](O)[C@@H](CO)O%17)O)[C@H]([C@H](O)[C@@H](CO)O%16)O)[C@H]([C@H](O)[C@@H](CO)O%15)O)[C@H]([C@H](O)[C@@H](CO)O%14)O)[C@H]([C@H](O)[C@@H](CO)O%13)O)[C@H]([C@H](O)[C@@H](CO)O%12)O)[C@H]([C@H](O)[C@@H](CO)O%11)O)[C@H]([C@H](O)[C@@H](CO)O%10)O)[C@H]([C@H](O)[C@@H](CO)O9)O)[C@H]([C@H](O)[C@@H](CO)O8)O)[C@H]([C@H](O)[C@@H](CO)O7)O)[C@H]([C@H](O)[C@@H](CO)O6)O)[C@H]([C@H](O)[C@@H](CO)O5)O)[C@H]([C@H](O)[C@@H](CO)O4)O)[C@H]([C@H](O)[C@@H](CO)O3)O)[C@H]([C@H](O)[C@@H](CO)O2)O)[C@@H](O)[C@H](O)[C@@H](CO)O1 JYJIGFIDKWBXDU-MNNPPOADSA-N 0.000 description 1
- 229940029339 inulin Drugs 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000012015 potatoes Nutrition 0.000 description 1
- 238000003918 potentiometric titration Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Electromechanical Clocks (AREA)
Description
Tilsetningsmiddel for mor tel og betong.Additive for mortar and concrete.
Oppfinnelsen vedrorer et tilsetningsmiddel for mortel og betong for forbedring av bearbeidelsesegenskapene samt egenskapene til herdet mortel eller betong, særlig fasthet, vanntetthet og frostbestandighet. The invention relates to an additive for mortar and concrete for improving the processing properties as well as the properties of hardened mortar or concrete, in particular firmness, water tightness and frost resistance.
Under mortel og betong forstås ved henvisning til DIN 1045 en kunstig stein, som oppstår fra en blanding av hydraulisk binde-middel, særlig Portland-sement, tilsatsstoffer og vann ved her-ding av sement/vannblandingen. With reference to DIN 1045, under mortar and concrete is understood an artificial stone, which arises from a mixture of hydraulic binder, especially Portland cement, additives and water during hardening of the cement/water mixture.
Ved fremstillingen av mortel og betong anvendes alt etter de for bearbeidelsen eller for den herdete mortel eller betong onskede egenskaper forskjellige tilsetningsmidler. Slike tilsetningsmidler er f.eks. bl.a. mykningsmidler, luftporedanneré, luftporedannende mykningsmidler, storkningsforsinkere, storkningsakseleratorer og fortykningsmidler. In the production of mortar and concrete, different additives are used depending on the properties desired for the processing or for the hardened mortar or concrete. Such additives are e.g. blue. plasticizers, air pore forming agents, air pore forming plasticizers, setting retarders, setting accelerators and thickeners.
Mykningsmidler eller plastifiseringsmidler forbedrer bearbeid-barheten av mortel og betong, senker tilsetningsvannbehovet og oker fastheten ved ellers lik sammensetning som folge av reduksjonen av vann/sement (v/s)-forholdet. Som mykningsmidler ble hittil hovedsakelig anvendt ligninsulfonater og glukonsyre samt deres salter. De forstnevnte har den ulempe at de frem for alt ved hpyere doseringer innforer makroluft, dvs. grove luftporer og derved sterkt reduserer den gjennom den mulige vanninnsparing oppnåelige forhoyelse av fastheten. Glukonsyre og dens salter forsinker avbindingen av mortel og betong i sterk utstrekning, hvilket i bygningspråksis for det meste er uonsket av nærliggende grunner. Folgelig må tilsetningsmengden av glukonsyre og dens salter kontrolleres noyaktig, da ved en overdo-sering denne uonskede virkning forsterkes. Plasticizers or plasticizers improve the workability of mortar and concrete, lower the need for additional water and increase firmness with an otherwise similar composition as a result of the reduction of the water/cement (w/s) ratio. Until now, mainly lignin sulphonates and gluconic acid and their salts were used as softeners. The former have the disadvantage that above all at higher dosages they introduce macro air, i.e. coarse air pores and thereby greatly reduce the increase in firmness that can be achieved through the possible water savings. Gluconic acid and its salts delay the setting of mortar and concrete to a great extent, which is mostly undesirable in building practice for similar reasons. Consequently, the addition amount of gluconic acid and its salts must be carefully controlled, as in the case of an overdose this unwanted effect is amplified.
Luftporedannere bevirker ved innforing av mikroluftporer frem for alt en sterk okning av frostbestandigheten og værbestandig-heten hos mortel og betong. Foruten det faktum at fastheten ned-settes ved innforing av mikroluftporer, har luftporedannere og-så den ulempe at de på grunn av den innforte lufts kompressibi-litet ikke egner seg for transport av mortel og betong ved pumper, som har stadig okende betydning. Air pore formers cause, by introducing micro air pores, above all, a strong increase in the frost resistance and weather resistance of mortar and concrete. Apart from the fact that the firmness is reduced by the introduction of micro air pores, air pore formers also have the disadvantage that, due to the compressibility of the introduced air, they are not suitable for the transport of mortar and concrete by pumps, which is of ever-increasing importance.
Fra US-patent nr. 3 432 317 er anvendelsen av polysakkarider som tilsetningsmiddel for mortel og betong kjent. For med disse polysakkarider å oppnå betraktelige kvalitetsokninger må relativt store mengde anvendes, hvilket igjen forsinker avbindingen sterkt. Forst en kombinasjon av disse polysakkaridene med relativt store mengder av vannloselige aminer og klorider gir hoye fastheter uten forsinkelse av avbindingen hos mortel og betong. Imidlertid må det regnes med at ved innholdet av klorider fremkalles en kor-rosjon av armeringene. Av denne grunn er anvendelsen av denne kloridholdige kombinasjon begrenset til ikke armert betong. The use of polysaccharides as an additive for mortar and concrete is known from US patent no. 3,432,317. In order to achieve considerable quality increases with these polysaccharides, a relatively large amount must be used, which in turn greatly delays the setting. First, a combination of these polysaccharides with relatively large amounts of water-soluble amines and chlorides gives high strengths without delaying the setting of mortar and concrete. However, it must be taken into account that the content of chlorides induces corrosion of the reinforcements. For this reason, the use of this chloride-containing combination is limited to non-reinforced concrete.
Målet for foreliggende oppfinnelse var å finne et tilsetningsmiddel for mortel og betong, som har en sterk plastifiserende og fasthetsokende virkning, og som samtidig oker vanntettheten såvel .som frostbestandigheten, uten derved å innfore makro- eller mikroluft i mortelen eller betongen. The aim of the present invention was to find an additive for mortar and concrete, which has a strong plasticizing and firmness-increasing effect, and which simultaneously increases water tightness as well as frost resistance, without thereby introducing macro- or micro-air into the mortar or concrete.
Den stilte oppgave loses ved et tilsetningsmiddel, som inneholder karboksylgruppeholdige polysakkarider, med en midlere mole-kylvekt på 400 til 4000, fortrinnsvis på 400 til 1600, og en karboksylgruppeandel på 2,5 til 25,0 vekts%. The task set is solved by an additive, which contains carboxyl group-containing polysaccharides, with an average molecular weight of 400 to 4000, preferably of 400 to 1600, and a carboxyl group proportion of 2.5 to 25.0% by weight.
Polysakkaridene som skal anvendes ifolge oppfinnelsen kan eksempelvis fremstilles ved oksydativ avbygning av hdymolekylære polysakkarider eller ved hydrolytisk avbygning av hoyeremole-kyiære karboksylgruppeholdige polysakkarider. Slike avbygnings-metoder er tilstrekkelig kjent for fagmannen. The polysaccharides to be used according to the invention can, for example, be produced by oxidative degradation of high-molecular polysaccharides or by hydrolytic degradation of high-molecular carboxyl group-containing polysaccharides. Such decomposition methods are sufficiently known to the person skilled in the art.
Som for den oksydative avbygning egnete hoyeremolekylære polysakkarider skal eksempelvis nevnes cellulose fra forskjellige planter, stivelse fra poteter, hvete, ris, mais og lignende og dekstrin. For den oksydative avbygning egner seg dessuten celluloselignende substanser, som lignin, hemicellulose, såkalte "Gums", kitin, inulin etc. For den hydrolytiske avbygning av boyeremolekylære karboksylgruppeholdige polysakkarider kommer bl.ai pektiner og alginater på tale. Examples of higher molecular weight polysaccharides suitable for oxidative degradation include cellulose from various plants, starch from potatoes, wheat, rice, corn and the like and dextrin. Cellulose-like substances, such as lignin, hemicellulose, so-called "gums", chitin, inulin etc. are also suitable for the oxidative breakdown. For the hydrolytic breakdown of boyeremolecular carboxyl group-containing polysaccharides, pectins and alginates are used, among others.
De karboksylgruppeholdige polysakkarider som skal anvendes ifolge oppfinnelsen har en midlere molekylarvekt bestemt ved den vaporometrisk (termoelektriske) metode, fra 400 til 4000 og en karboksylgruppeandel på 2,5 til 25,0vekts%, d.v.s. 25 til 250 mg pr. g polysakkarid. Metoden for vaporometrisk molekylar-vektsbestemmelse beskrives.avA.P. Brady, H. Huff og J.W. The carboxyl group-containing polysaccharides to be used according to the invention have an average molecular weight determined by the vaporometric (thermoelectric) method, from 400 to 4000 and a carboxyl group proportion of 2.5 to 25.0% by weight, i.e. 25 to 250 mg per g polysaccharide. The method for vaporometric molecular weight determination is described by A.P. Brady, H. Huff, and J.W.
Mc Bain i J. physic. Colloid Chem. 55, 304 (1951) samt av Ch. Chylewski og W. Simon i Chem. Heiv. Acta, 47 II, 515 (1964). Bestemmelsen av karboksylgruppeandelen utfores ved potentiome-trisk titrering. McBain in J. Phys. Colloid Chem. 55, 304 (1951) as well as by Ch. Chylewski and W. Simon in Chem. Hooray. Acta, 47 II, 515 (1964). The determination of the carboxyl group proportion is carried out by potentiometric titration.
Tilsetningsmidlene ifolge oppfinnelsen anvendes i mengder som svarer til 0,05 til 1 vekts%, fortrinnsvis 0,05 til 0,5 vekts%, karboksylgruppeholdig polysakkarid, regnet på sement. The additives according to the invention are used in amounts corresponding to 0.05 to 1% by weight, preferably 0.05 to 0.5% by weight, carboxyl group-containing polysaccharide, calculated on cement.
De nye tilsetningsmidlene ifolge oppfinnelsen oppviser betydelige fordeler overfor de kjente produkter, hvor de viktigste anskueliggjøres i det folgende: De innforer i sammenligning med de kjente ligninsulfonatene praktisk talt ingen makroluft, hvorved oppnåes en oket fasthet. I motsetning til glukonsyre og dennes salter forsinker de avbindingen ved de vanlige tilsetningsmengder i liten utstrekning. De har ikke de ovenfor anforte ulempene til de kjente luftporedannere, da den med det nye tilsetningsmiddel fremstilte herdete mortel eller betong ved god frostbestandighet viser en oket trykkfasthet (uten å innfore mikroluft). Da ingen luftporer innfores, lar den fremstilte mortel eller betong med tilsetningsmidlet ifolge oppfinnelsen seg pumpe uten vanskeligheter. The new additives according to the invention show significant advantages over the known products, the most important of which can be seen in the following: Compared to the known lignin sulphonates, they introduce practically no macro air, whereby an increased firmness is achieved. In contrast to gluconic acid and its salts, they delay the setting to a small extent at the usual addition amounts. They do not have the above-mentioned disadvantages of the known air pore formers, as the hardened mortar or concrete produced with the new additive shows an increased compressive strength (without introducing micro-air) with good frost resistance. As no air pores are introduced, the prepared mortar or concrete with the additive according to the invention can be pumped without difficulty.
Sammenlignet med de fra US-patentskrift nr. 3 432 317 kjente polysakkarider bevirker de nye karboksylgruppeholdige polysakkarider en bedre mykning eller plastifisering, hvilket allerede ved lav dosering resulterer i storre vanninnsparing og til-svarende hoyere trykkfasthet. Samtidig virker tilsetningsmidlene ifolge oppfinnelsen ved de vanlige tilsetningsmengder min-dre sterkt forsinkende. For å eliminere avbindingsforsinkelsen er i motsetning til de i US-patent nr. 3 43 2 317 anforte, all-tid koridholdige kombinasjoner tilsetning av i og for seg kjente kloridfrie akseleratorer, som f.eks. alkali-og jordalkalisalter, alkanolaminer, formiater etc. tilstrekkelig til tilsetningsmidlet ifolge oppfinnelsen. Av de ovenfor nevnte substanser foretrekkes formiater, særlig på grunn av sin gode virkning. Da for forhindring av forsinkelsen av avbindingen ingen av de ifolge teknikkens stand anvendte klorider trenges, består ingen korrosjonsfare, hvilket er særlig viktig ved armert eller for-spent betong. Compared to the polysaccharides known from US Patent No. 3,432,317, the new carboxyl-group-containing polysaccharides cause a better softening or plasticization, which even at a low dosage results in greater water savings and correspondingly higher compressive strength. At the same time, the additives according to the invention have a less strongly delaying effect at the usual amounts of addition. In order to eliminate the setting delay, in contrast to the always chloride-containing combinations listed in US patent no. 3 43 2 317, the addition of per se known chloride-free accelerators, such as e.g. alkali and alkaline earth salts, alkanolamines, formates etc. sufficient for the additive according to the invention. Of the substances mentioned above, formates are preferred, particularly because of their good effect. Since none of the chlorides used according to the state of the art are needed to prevent the delay in setting, there is no risk of corrosion, which is particularly important with reinforced or prestressed concrete.
På overraskende måte oppnåes med de karboksylgruppeholdige polysakkarider som skal anvendes ifolge oppfinnelsen uventet hoye fasthetsokninger. Disse er storre enn det kunne ventes på grunn av vanninnsparingen. Videre fordeler er den betydelige okning av mortelens og betongens tetthet overfor vann samt den utmer-kede frostbestandighet. In a surprising manner, unexpectedly high increases in firmness are achieved with the carboxyl group-containing polysaccharides to be used according to the invention. These are larger than might be expected due to the water savings. Further advantages are the significant increase in the density of the mortar and concrete against water as well as the excellent frost resistance.
Den uventede forbedring av egenskapene til den med de nye karboksylgruppeholdige polysakkarider fremstilte mortel og betong beror formodentlig på dannelsen av en kjemisk forbindelse mellom sement og tilsetningsmidler samt på den ved tilsetningsmidler bevirkede indre sammenbinding mellom sementsten og til-setningsstoff. The unexpected improvement in the properties of the mortar and concrete produced with the new carboxyl group-containing polysaccharides is presumably due to the formation of a chemical connection between cement and additives as well as the internal bonding between cement stone and additive caused by additives.
Det er overordentlig overraskende at de nye tilsetningsmidler forsinker avbindingen særlig ved hoyt karboksylgruppeinnhold min-dre enn glukonsyre eller dens salter eller også de kjente ikke-karboksylgruppeholdige polysakkarider, da fagmannen ut fra sin viten kunne vente noyaktig det motsatte. Denne egenskap kan bevises ved konkrete tall i den etterfølgende tabell 1. It is extremely surprising that the new additives delay the debonding, particularly with a high carboxyl group content less than gluconic acid or its salts or also the known non-carboxyl group-containing polysaccharides, as the person skilled in the art could expect exactly the opposite from his knowledge. This property can be proven by specific figures in the following table 1.
I tabellene ble de folgende forkortelser anvendt:In the tables, the following abbreviations were used:
PE 1 Tilsetningsmiddel som anvendes ifolge oppfinnelsen: Oppnådd ved hydrolytisk avbygning av pektin Gjennomsnittlig molekylarvekt: 600 PE 1 Additive used according to the invention: Obtained by hydrolytic breakdown of pectin Average molecular weight: 600
Karboksylgruppeinnhold :■ 11,0 %Carboxyl group content:■ 11.0%
PE 2 Tilsetningsmiddel som anvendes ifolge oppfinnelsen* PE 2 Additive used according to the invention*
Oppnådd ved oksydativ avbygning av maisstivelse Gjennomsnittlig molekylarvekt: 1 200 Obtained by oxidative breakdown of corn starch Average molecular weight: 1,200
Karboksylgruppeinnhold: 6,1 %Carboxyl group content: 6.1%
PS 1 Polysakkarid (uten karboksylgrupper) PS 1 Polysaccharide (without carboxyl groups)
Gjennomsnittlig molekylarvekt: 1 320 Average molecular weight: 1,320
Karboksylgruppeinnhold: 0Carboxyl group content: 0
PS 2 Polysakkarid (uten karboksylgrupper) PS 2 Polysaccharide (without carboxyl groups)
Gjennomsnittlig molekylarvekt: 1 700 Average molecular weight: 1,700
Karboksylgruppeinnhold: 0 Carboxyl group content: 0
Ca LS KalsiumligninsulfonatCa LS Calcium lignin sulfonate
Alle oppforte forsok ble utfort med normal Portland-sement med en spesifikk overflate ifolge Blaine på 3100 cm 2/g og folgende mineralogiske sammensetning ifolge Bogue: All the above experiments were carried out with normal Portland cement with a specific surface according to Blaine of 3100 cm 2/g and the following mineralogical composition according to Bogue:
I tabell 2 er resultatene av sammenlingingsforsok sammenfattet: Alle forsok ble utfort med betong av samme bearbeidbarhet med 300 kg normal Portiand-sement pr. m 3 og et maksimalt tilsats-stoffkorn på 32 mm med folgendé granulometri: Table 2 summarizes the results of comparison tests: All tests were carried out with concrete of the same workability with 300 kg of normal Portiand cement per m 3 and a maximum additive material grain of 32 mm with the following granulometry:
Av tabell 2 fremgår den overfor de kjente polysakkarider og ligninsulfonater hoyerevanninnsparing samt hoyere fasthet. Table 2 shows that compared to the known polysaccharides and ligninsulfonates, higher water retention and higher firmness.
Som det fremgår av tabell 3, okes ved anvendelse av det nye tilsetningsmidlet vannugjennomtrengeligheten hos mortel og betong. Forsokene ble utfort med betonger med 250 kg normal Portland-sement pr. m , maksimal tilsetningsstoffkorn: på 32 mm, granulometri som angitt for tabell 2 og stadig samme bearbeidbarhet ((Bearb: 8-9 sek.). For den egentlige proving av vannugjennom-trengelighet ble provelegemene lagret 21 dager ved romtemperatur og 90 % relativ fuktighet og 7 dager ved romtemperatur og 50 % relativ fuktighet. Selve provingen skjedde ifolge DIN 1048, avsnitt 4.7. Den ved tilsetningsmidlet ifolge oppfinnelsen oppnåelige forbedring av frostbestandigheten fremgår av tabell 4. For forsokene ble anvendt betong med samme bearbeidbarhet (Bearb: 8-9 sek.) med 300 kg normal Portland-sement pr. m 3og et maksimalt tilset-ningsstof fkorn på 3 2 mm, granulometri som angitt for tabell 2. For bestemmelse av frostbestandigheten ble betongen (ifolge SIA Teknisk Norm 162 [SNV 562 162] retningslinje 5) underkastet<1>frost/tau-sykler og reduksjonen av E-mbdul i avhengighet av an-tallet frost/tau-sykler bestemt, i As can be seen from table 3, when using the new additive, the water permeability of mortar and concrete is increased. The tests were carried out with concretes with 250 kg of normal Portland cement per m , maximum additive grain: of 32 mm, granulometry as indicated for table 2 and always the same workability ((Workability: 8-9 sec.). For the actual testing of water permeability, the test pieces were stored for 21 days at room temperature and 90% relative humidity and 7 days at room temperature and 50% relative humidity. The testing itself took place in accordance with DIN 1048, section 4.7. The improvement in frost resistance achievable with the additive according to the invention is shown in table 4. For the tests, concrete with the same workability was used (Workability: 8-9 sec .) with 300 kg of normal Portland cement per m 3 and a maximum additive grain of 3 2 mm, granulometry as specified for table 2. To determine the frost resistance, the concrete (according to SIA Teknisk Norm 162 [SNV 562 162] guideline 5 ) subjected to<1> frost/tau cycles and the reduction of E-mbdul depending on the number of frost/tau cycles determined, in
Som det fremgår av tabell 1 virker tilsetningsmidlene ifolge oppfinnelsen forsinkende på avbindingen av mortel og betong. Denne forsinkende virkning kan delvis eller helt kompenseres ved kombinasjon av tilsetningsmidlene ifolge oppfinnelsen med kjente, akselerende virkende tilsetninger som alkanolaminer, alkali- og jordalkalisalter, særlig formiater etc.. I det f 61-gend er noen mulige eksempler på slike kombinasjoner og deres avbindingsinnflytelse angitt. As can be seen from table 1, the additives according to the invention retard the setting of mortar and concrete. This delaying effect can be partially or completely compensated for by combining the additives according to the invention with known, accelerating additives such as alkanolamines, alkali and alkaline earth salts, especially formates etc.. In the f 61-gend, some possible examples of such combinations and their debinding influence are indicated .
Claims (6)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH944775A CH599066A5 (en) | 1975-07-18 | 1975-07-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO762498L true NO762498L (en) | 1977-01-19 |
Family
ID=4352097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO762498A NO762498L (en) | 1975-07-18 | 1976-07-16 |
Country Status (9)
| Country | Link |
|---|---|
| AT (1) | AT359417B (en) |
| BE (1) | BE844145A (en) |
| CH (1) | CH599066A5 (en) |
| DE (1) | DE2630799C3 (en) |
| FI (1) | FI761980A7 (en) |
| FR (1) | FR2318127A1 (en) |
| NO (1) | NO762498L (en) |
| SE (1) | SE425383B (en) |
| ZA (1) | ZA764113B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0006279B1 (en) * | 1978-02-22 | 1982-01-27 | Imperial Chemical Industries Plc | Cementitious composition, a method to prepare it and shaped article derived therefrom |
| NZ192046A (en) * | 1978-11-15 | 1981-02-11 | Bp Chemicals Co | Cementitious composition comprising an acid formate of ammonium, sodium or potassium as an accelerator |
| US4219362A (en) * | 1979-02-28 | 1980-08-26 | Merck & Co., Inc. | Sag resistant Portland cement compositions |
| DE3829328C1 (en) * | 1988-08-30 | 1989-12-07 | Wolfgang Dipl.-Chem. Dr. 1000 Berlin De Ortlepp | Coating composition for preventing asbestos fibre pollution from asbestos/binder building material |
| JP3172932B2 (en) * | 1994-07-05 | 2001-06-04 | 大成建設株式会社 | Method for producing hydraulic composition using generated soil |
| US6033469A (en) * | 1995-07-25 | 2000-03-07 | Dyckerhuff Ag | Injection preparation suspension free of sodium bentonite |
| DE19537616C2 (en) * | 1995-07-25 | 1998-01-22 | Dyckerhoff Ag | Sodium bentonite-free injection medium suspension |
| US20220185733A1 (en) * | 2020-12-11 | 2022-06-16 | Sika Technology Ag | Cementitious compositions comprising oxidatively degraded polysaccharide as water reducing agents |
-
1975
- 1975-07-18 CH CH944775A patent/CH599066A5/de not_active IP Right Cessation
-
1976
- 1976-06-23 SE SE7607253A patent/SE425383B/en unknown
- 1976-07-02 AT AT487776A patent/AT359417B/en not_active IP Right Cessation
- 1976-07-07 FI FI761980A patent/FI761980A7/fi not_active Application Discontinuation
- 1976-07-08 DE DE2630799A patent/DE2630799C3/en not_active Expired
- 1976-07-12 ZA ZA764113A patent/ZA764113B/en unknown
- 1976-07-15 BE BE168925A patent/BE844145A/en unknown
- 1976-07-15 FR FR7621672A patent/FR2318127A1/en not_active Withdrawn
- 1976-07-16 NO NO762498A patent/NO762498L/no unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE425383B (en) | 1982-09-27 |
| FI761980A7 (en) | 1977-01-19 |
| DE2630799A1 (en) | 1977-02-03 |
| ATA487776A (en) | 1980-03-15 |
| DE2630799C3 (en) | 1980-10-09 |
| SE7607253L (en) | 1977-01-19 |
| FR2318127A1 (en) | 1977-02-11 |
| BE844145A (en) | 1976-11-03 |
| ZA764113B (en) | 1977-06-29 |
| CH599066A5 (en) | 1978-05-12 |
| AT359417B (en) | 1980-11-10 |
| DE2630799B2 (en) | 1979-02-01 |
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