JPH035351A - Production of mortar - Google Patents

Abstract

PURPOSE:To enable nailing and to improve adhesive strength, strength, flexibil ity, and nail retentivity by kneading ordinary portland cement, fine aggregate, perlite, lignin-removed woody fiber, methylcellulose, and water. CONSTITUTION:Mortar is prepared by kneading 100 pts. (by weight, the same applied to the following) ordinary portland cement, 100-150 pts. fine aggregate, 10-20pts. perlite, 1.5-3.0 pts. lignin-removed woody fiber of 6-10mm length and 0.6-1.0mm average diameter, 0.05-0.01pts. methylcellulose, and water, and further, a foaming agent for cement is added to the above mortar, if necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for producing mortar that can be driven into nails and is applied to roof bases, walls, floors, and the like.

(Prior Art) Manufacture of nailable mortar using Boltland cement has been carried out for a long time, and a representative example is perlite mortar using perlite as the fine aggregate of the mortar.

(Problems to be Solved by the Invention) The conventional pearlite mortar has many drawbacks, such as cracking after construction, lack of stickiness in nail pull-out strength after nailing, and weakening.

Therefore, if you increase the strength of the mortar by increasing the amount of cement or mixing ordinary fine aggregate,
After a few days, normal nails cannot be driven into the area.

In addition, products with added resin emulsions have appeared in recent years, but their characteristics are not much different from those mentioned above.
There are problems such as increased manufacturing costs.

The present invention was proposed in view of the problems of the prior art, and its purpose is to allow sufficient nailing even after one month or more has passed after construction, and to maintain stable nail pull-out strength. To provide a method for producing mortar that is strong, does not cause cracks, and can be applied thickly at one time.

(Means for Solving the Problem) In order to achieve the above object, according to the method for producing mortar according to the present invention, 100 parts of ordinary Boltland cement (
(weight ratio), fine aggregate 100-150 parts (weight ratio), perlite 10-20 parts (weight ratio), lignin-removed wood fiber 1.5-3.0 parts (weight ratio), methylcellulose 0.05
~0.01 part (weight ratio) and water are kneaded.

Further, it is preferable to add a foaming agent for cement to the mortar so as to improve the workability of the mortar and the pumping performance.

(Function) According to the present invention, as described above, 100 parts of ordinary Portland cement (weight ratio, hereinafter the same incoming wire aggregate 100 to 15 parts)
0 parts, along with 10 to 20 parts of perlite, 1.5 to 3.0 parts of wood fibers from which lignin in the wood components, which adversely affects the hydration of cement, has been removed are added to further impart water retention and thickening properties. The mortar is manufactured by adding 0.05 to 0.1 part of methylcellulose and kneading it with water, so the mortar has flexibility and, after hardening, is easy to nail, which is a characteristic of wood. Furthermore, the wood fibers fulfill their original purpose, have fewer cracks than perlite mortar or sawdust mortar, prevent dripping during construction, and provide stable nail retention strength. It will be done. Furthermore, since wood fibers can be added to the mortar afterward, kneading is easy.

In addition, when a foaming agent for cement is added, the workability is improved, the pumping performance is better, the softness of the mortar is sufficiently maintained during construction, and the mortar has excellent trowel finishability.

(Example) The present invention will be described below with reference to Examples.

(il Ordinary Voltland cement: 100 parts (the same below weight ratio) (11) Fine aggregate: 100 to 150 parts 010 Add an appropriate amount of water or cement water reducer (trade name: Watersol, manufactured by Dainippon Ink & Chemicals) Mix the added water (i) (iil (ii) with a mixer for 90 seconds.

Next, 1.5 to 3.0 parts (■) of wood fibers with an average diameter of 0.6 to 1.0 mm are obtained by cutting the lauan from which the lignin in the wood components has been removed by Gvl heating steam treatment to a length of 6 to 10 mm.
Pearlite (maximum particle size 2mm); 0.1 to 0.2 parts (b) Methyl cellulose 0.05 to 0.1 parts or more Gvl
M (b) is sequentially added to ordinary Bortland cement in the mixer and mixed for about 120 seconds to produce mortar that can be driven into nails.

Next, Table 1 lists formulation examples and physical properties of mortar produced by this method.

In Table 1, the nails used for the nail retention test were 2.5 m in diameter.
It is a copper nail 25 mm long and driven to a depth of 20 mm.

In Table 1 above, the amount of pearlite is as in specimen No. 016,
When the ratio is 20 or more per 100 of the cement weight, the kneaded property tends to be rough, and the adhesion to the base and the nail retention strength are weakened, which is not preferable.

Furthermore, if the amount of wood fiber is 3.0 or more per 100 parts of the weight of cement, it tends to become bulky, resulting in unfavorable workability such as pumping performance.

Furthermore, as in specimens No. 008 and No. 39, a foaming agent (product name: Pulmix (LW-18), manufactured by Wakitachi Kagaku Sangyo) was added.
In the case of mortar added, there is less clumping of the mortar during trowel finishing, pumping performance, etc., and exhibits more favorable work properties.

Furthermore, the mortar produced by this method has a material age of 4.
It has been demonstrated that even after a few weeks, the copper nails can be sufficiently driven, sufficient retention force can be obtained, and no cracks will occur.

Note that the mortar can be manufactured satisfactorily using an ordinary concrete mixer, etc., since the mortar has excellent mixing performance.

In addition, mortar produced by mixing cement, fine aggregate, and water at the batcher plant is transported to the construction site using a concrete mixer truck, and at the same site, wood wool fibers, perlite, and methyl cellulose are added to the mortar in the mixer truck. A nailable mortar can also be produced by charging l+19 times and rotating the mixer at high speed for 2 to 3 minutes.

(Effects of the Invention) According to the present invention, as described above, 100 parts of ordinary boltland cement (weight ratio, same hereinafter) and 100 to 15 parts of fine aggregate
0 parts perlite 10-20 parts, lignin-removed wood fiber 145-3 parts, methylcellulose 0.05-0.01
Compared to conventional perlite mortar and sawdust mortar that can be driven into nails, it has fewer cracks, has better adhesion, can be applied thickly, is strong, and is flexible. It is possible to produce a mortar that has a high nailing property, can be driven into nails, and has a high nail-holding force.

Further, according to the method of the present invention, wood fibers, perlite, etc. can be added to the ordinary mortar afterward, so kneading is easy.

Furthermore, the method of the present invention is less expensive and has better fire resistance than conventional nailable latex mortar.

Furthermore, since the mortar has excellent mixing performance, it can be sufficiently manufactured using an ordinary concrete mixer, and the ordinary mortar manufactured at the plant can be transported to the site using a mixer truck and mixed with wood fibers, perlite, and methyl cellulose. It can also be produced by putting it into a mixer truck and rotating it at high speed for 2 to 3 minutes.

According to the second aspect of the invention, by adding a foaming agent for cement to the mortar, the workability of the mortar is improved and the pumping performance is improved.

Claims (1)

[Claims] 1. Ordinary boltland cement 100 parts (weight ratio), fine aggregate 100-150 parts (weight ratio), pearlite 10-2
0 parts (weight ratio) Wood fiber from which lignin has been removed 1.5 to 3.
A method for producing mortar, which comprises kneading 0 parts (weight ratio) of 0.05 to 0.01 parts (weight ratio) of methyl cellulose and water. 2. The method for producing mortar according to claim 1, wherein a foaming agent for cement is added to the mortar.