SU1759819A1 - Mixture for making cellular concrete - Google Patents

Abstract

Use: in the manufacture of wall materials for housing. The invention: in a mixture containing Portland cement, CHP ash, lime, aluminum powder and water, additional wood chips are introduced with a fraction of 5-20 mm. The components are taken in the following ratio, wt.%: Portland cement 30.6-34.6; ash CHP 22.3-25.2: lime 2.68-3.1; wood chips 0.71-9.17; aluminum powder 0.04-0.045; water the rest.

Description

The invention relates to the building materials industry and can be used in the production of wall materials for housing.

Known arbolitov mixture, including, wt.%; Portland cement 33-36; woodworking waste 21-24, chemical additive - mineralizer 0.8-1; water the rest.

The technology of production of wood concrete products involves the use of special methods of compaction of wood concrete mixture - pressing, rolling, vibropressing. Wood concrete as a material is characterized by a large-pore structure and has low strength.

The closest in technical essence to the present invention is a mixture for the preparation of cellular concrete, including Portland cement, ash, lime, aluminum powder and water.

The main disadvantage of the known mixture is the low mechanical strength of cellular concrete.

The purpose of the invention is to increase the strength of cellular concrete.

For this mixture for the preparation of cellular concrete, including Portland cement, ash, CHP, lime, aluminum powder and water, additionally contains wood chips of a fraction of 5 ... 200 mm and the components are taken in the following ratio, wt.%:

Portland cement30.6-34.6

Ash TPP22.3-25.2

Lime 2.68-3.1

0,71-9,17 wood chips

Aluminum Powder0.04-0.045

WaterEverything

An example of obtaining cellular concrete. To obtain cellular concrete, Portland cement 400 of the Teplozersky plant, water removal ash of the Khabarovsk CHPP-1, aluminum powder were used.

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PAK-3 grades, hydrated lime of the Londoko lime plant, wood shavings of the Khabarovsk plant strodetal. Calcium chloride was used as a mineralizer additive. Used shavings fraction 5-20 mm. Before introducing into the mixture, the chips were kept for 10 min in a 10% aqueous solution of calcium chloride.

Concrete mixture was prepared as follows. Cement, ash and lime, taken in a given amount, were stirred until a homogeneous mixture was obtained, then chips were added and mixed for 1 minute. Thereafter, 90-95% of the mixing water heated to 55 ° C was introduced into the mixture. Then, after stirring for 1 min, aluminum powder with the remainder of the mixing water in the form of a suspension was added to the resulting solution and the final mixing was carried out for 1 min.

The finished cell-bead mix was poured into molds - cubes with dimensions 10x 10x 10 cm. The first days the samples were kept in air, and then after removing them from the molds were placed in a chamber with a hydraulic shutter (normal hardening). At the age of 28 days, the samples were dried to constant weight, weighed, and subjected to strength testing. In parallel, according to a similar procedure, samples were prepared from a gas-ash concrete mixture in accordance with the prototype and from an arbolite mixture. The results are shown in the table.

From the analysis of the table it can be concluded that the introduction of wood chips in aerated concrete (in the amount of 0.7-4.61%) increases its strength by 32-64%. When the chip content is less than 0.7%, the increase in strength becomes negligible. At a chip concentration of more than 9%, the swelling of the mixture sharply deteriorates, the structure of concrete is characterized by the presence of a large number of large pores and cavities. Along with this, the strength of concrete is significantly reduced. Analyzing the results of the tests carried out, it should be concluded that arbolit is significantly inferior in strength not only to the material according to the invention, but also to gazozolobeton - the prototype. Using a mixture of cellular concrete as compared to the prototype allows efficient utilization of CHP ash and wood waste from woodworking plants, improving construction and technical indicators of cellular concrete properties, namely, increasing the strength, impact strength, crack resistance of products.

Claims (1)

Invention Formula Mixture for the preparation of cellular concrete, including Portland cement, CHP ash, lime, aluminum powder and water, characterized in that, in order to increase strength, it additionally contains wood chips of a fraction of 5-20 mm with the following content of components, wt.% : Portland cement30.6-34.6; Ash TPP22.3-25.2; Lime 2.68-3.10; Wood chips fraction 5-20 mm 0,71-9,17; Aluminum powder0,040-0,045; Water the rest.