DD200099A1 - MIXTURE FOR FASTENING TRAFFIC SURFACES - Google Patents

Abstract

The invention relates to a mixture for the attachment of traffic surfaces such as the base course in road constructions and for load-bearing and cover layers for roadway and track fastening.The aim is the use of broken rock and secondary raw material while reducing cement consumption. The task is an optimal particle size distribution of the substance mixture. In accordance with the invention, crushed rock is intimately mixed with silica-rich lignite filter ash of pozzolanic character and magnesium chloride solution or calcium chloride solution or water.

Description

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Title of the invention

Mixture for fixing traffic areas

field of use

The invention relates to a mixture for base layers in road constructions and for wearing and cover layers in Y / ege- and Platzbefestigungen.

Characteristic of the known technical solutions

There are known mixtures of granular crushed stone, chippings and sand, called mineral concrete, which have a composition based on the concrete principle and a high load-bearing capacity in the compacted state *

For this purpose, the grain system may consist of broken, non-setting rock or blast furnace slag which has self-hardening properties owing to its chemical composition.

Due to its grain size distribution and low cohesion, this mixture tends to segregate during transport, transfer and installation. The uneven grain size arrangement thus created in the construction layer causes significant differences in density and load bearing capacity owing to the high deformation resistance of the mixture a particularly intensive compaction is required. Density deficiencies and density differences are often the causes of permanent deformation ·

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The mixtures prepared with optimum water content dry out quickly during the storage and transport processes, whereby the experimentally determined maximum dry bulk density is not reached _#

The construction layer made from the mixture must be either treated periodically with hygroscopic salts or protected by a cover layer to protect against mechanical corrosion and to ensure the required freedom from dust during air movement.

In order to improve the load carrying capacity and the processability as well as to increase the resistance to mechanical corrosion, construction layers of low aggregate concrete are produced. Cement, hydrophobized high-hydraulic limescale, finely ground blast-furnace slag as active filler as well as plug-in lime-rich composition with relatively hydraulic properties are used as binders.

The binder content of 2 to 5 % leads to a partial filling of the pore space in the mineral concrete and to a bond »The compressive strength is up to 12 MPa.

Despite the addition of the mixture setting inhibiting additives, stockpiling of the final mixture in silos is not possible.

The use of cement or hydraulic lime as a plasticizer and as a binder increases the economic and energetic effort · for the production of the building material considerably, without achieving a corresponding increase in the carrying capacity ζμ. The application of ground high . ' - ^: Oven slag is limited due to their availability and the production required for their production.

ZJe _- I., the invention;

The aim of the invention is to produce a mixture of crushed rock using secondary rolling materials with an equal reduction in cement and energy consumption.

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put.

Legend of the essence of the invention

The invention has for its object to fill the pore space of mineral concrete from non-setting, broken, cheap grain-distributed rock proportionally by an additive that prevents its segregation during the transport, handling and storage processes of the mixture, during installation and compression a reduced deformation resistance and in the long term, a bond of fine-grained. Components of the mixture for increasing the dust-free and mechanical. Ressistenz effects ». V ....

According to the invention, this object is achieved in that non-setting, broken rock favorable Konigrößenverteilung is intimately mixed with siliceous lignite filter bag pozzolanic character of fine cleaning stage of flue gases of thermal power plants and magnesium chloride solution or calcium chloride solution or water.

Ausfü currency sbe is piele

In embodiments, the invention is explained in more detail:

The mixture for producing the base course of a road. construction is metered and preferably mixed in a compulsory mixer.

The diameter of the largest grain may be 16 mm to 63 mm for different blend compositions. Pure mixtures with a maximum grain size of 16 mm diameter will be equal to mixtures with .63 mm largest grains in terms of better processability and a better adaptation of the layer thickness to conditions of the load-bearing capacity of the compacted foundation plan, but also a reduced bearing capacity of the Building material layer reached.

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The particle size distribution is based on the exponential function P = 100 (§) ^m

ρ ~ percentage of the particle size group

0d _± d

d = largest grain diameter of a crown size group

d = any grain diameter

D = largest grain diameter in the mixture

m = exponent of the distribution function

For D = 16 mm, 0.45 = m = 0.6

Pur D = 63 mm is 0.35 = m = 0.6

The addition of lignite filter ash is dependent on m. The proportion lignite filter ash is

- at D = 16 mm and m = 0.6: 5 to 20 % of the dry matter

m = 0.45: 2 to 15% of the dry matter

- at D = 63 mm and m = 0.6: 8 to 23 % of dry matter

ei = 0.35: 2 to 15% of the dry matter

Addition of make-up water containing calcium chloride or magnesium chloride up to a solution concentration of 2 % may be added or the addition of potassium hydroxide at a solution concentration of up to 2 % is 4 to 7.5% of the dry matter, depending on the particle size distribution and Share of lignite filter ash. '

As a criterion, the'Wasserzugabe applies' that the mixture flour flour receives a soil-moist consistency analogous to the consistency of a stamped concrete. The optimization of the addition of water can be carried out experimentally using the methods for consistency testing of cement concrete.

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The invention provides the following advantages:

1. The addition of lignite filter ash to crushed 0/16 mm to 0/63 ram rock in the presence of water will result in a cohesion of the mixed mortar which will remove the mixture during the handling, transport and installation processes prevented.

As a result, special technological measures for re-mixing in the place of installation are eliminated and a good uniformity of sustainability and thus high quality of the product is achieved. The concomitant increase in the für-modulus decisive for the measurement therefore also leads to a reduction of the layer thicknesses by 10 to 20 %,

2. The addition of lignite filter ash to the crushed mineral mixture facilitates the distribution of the greens in the place of installation. The required compaction energy is reduced.

3 · The lignite filter ash in the mixture causes a long-term moisturization of the mixture. In the compacted base course, this effect leads to an increase in the shear strength until a bonding of the brown coal filter ash, which dissolves the surface tension, due to its latent-hydraulic and puzzle-like properties.

4 »The lignite filter ash in the mixture does not require the use of cement. In comparison '' to cementitious mineral concrete, which has properties similar to that of the mixture produced according to the present invention with addition of siliceous lignite filter bag of pozzolanic character with a feedstock of 2 % portland cement, becomes a saving

3 out of 50 ... 1b0 kg Portland cement per et achieved «

Claims (1)

inventors claim Mixture for the attachment of traffic areas of non-binding broken rock, siliceous lignite filter bag of pozzolanic character and water, characterized in that - The non-binding, broken rock is composed according to the principle of the cavity minimum and the largest grain diameter is between 16 and 63 mm. - The siliceous lignite filter bag of pozzolanic character with a mass fraction of 5 to 23 % , depending on the particle size distribution of the crushed rock, was added - The siliceous lignite filter ashes contain at least 60 % of the particle size group smaller than 0.09 mm - The mixing water magnesium chloride or calcium chloride is added with a maximum concentration of up to 2 % with a required to achieve a moisture-moist consistency mass fraction.