Preparation method of composite foam concrete

Abstract

The invention discloses a preparation method of composite foam concrete. The method is characterized in that: main raw materials comprise, by weight, 20-85 parts of Portland cement, 5-85 parts of ultrafine aggregate, 10-20 parts of fly ash and 20-60 parts of water; the above-mentioned four concrete raw materials are stirred to form common ultrafine aggregate concrete slurry; and by taking the volume of a finished product of the common concrete slurry as 1 part, the following materials comprising 0.8-4 parts of foam, 0.5-3 parts of polyphenylene particles with the diameter of 2-4 mm and 0.5-3 parts of polyphenylene particles with the diameter of 6-8 mm are added in parts by volume for composition. The ultrafine aggregate is obtained by industrial grinding of natural stone, or waste buildingconcrete or waste glass materials, and the particle size of the ultrafine aggregate is not larger than 0.1 mm. The method has the advantages of being simple, efficient, relatively high in strength, easy to machine and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a composite foam concrete. Background technique [0002] The existing foamed concrete is a kind of foam containing a large number of closed pores formed by the foaming system of the foaming machine to fully foam the foaming agent mechanically (or physically), and evenly mix the foam with the concrete. New lightweight concrete material. It is widely used in indoor and outdoor cushions, roof insulation, non-load-bearing walls, etc. Studies have shown that the pore structure of foam concrete is affected by the water-cement ratio and the amount of air introduced. With the adjustment of the water-cement ratio and air content, the average pore diameter is 0.15mm, the pore interval is 0.05mm, and the porosity is 40%. The highest strength-quality Compare. However, in the application process, it is generally necessary to pursue higher porosity, so its strength is generally v...

AI Technical Summary

Problems solved by technology

However, in the application process, it is generally necessary to pursue higher porosity, so its strength is generally very low, and its application range is limited to a certain extent.

It has the following disadvantages: (1) The relationship between the strength of foam concrete and the foam content is: as the amount of foam increases, the strength of concrete gradually decreases, and when the foam reaches a certain amount, the strength of concrete presents a trend of accelerated decline

(2) The aggregates used in ordinary foam concrete are: lightweight aggregate (coarse aggregate) and sand (fine aggregate). When using it to produce prefabricated parts, the formed concrete is not easy to carry out secondary processing such as cutting

(3) When the concrete is mixed on a large scale, it is difficult to ensure that the air does not enter the mixing slurry, and the foam concrete itself has many fine air bubbles, and the slurry is relatively light. It is difficult to squeeze out the above-mentioned air by vibrating during pouring When the concrete is released, air masses are formed in the concrete, commonly known as "honeycomb", which seriously affects the strength of the concrete

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