Method for preparing and testing rubber aggregate admixed foam concrete

Abstract

The invention discloses a method for preparing and testing rubber aggregate admixed foam concrete. The method comprises the following steps: determining the dry density, the strength and the heat conduction coefficient of the foam concrete according to the environment in which the foam concrete is to be applied; determining the water-cement ratio and the mix proportion of the foam concrete, wherein the water-cement ratio is 0.45 to 0.60; uniformly mixing and stirring cement, rubber aggregates and water to obtain rubber aggregate admixed cement; mixing water with a foaming agent, and pouring the obtained foaming agent solution into a foaming machine to produce foam; mixing the foam with the rubber aggregate admixed cement to form a slurry, and uniformly stirring the slurry; pouring the uniformly stirred slurry into a restrained shrinkage device; curing the poured slurry for 1 d under standard conditions, performing die stripping, and curing the cured slurry at a temperature of (20 + / -2)DE C under a relative humidity of (60 + / - 5)%; and determining the cracking time and the 28 d age crack width. The shrinkage rate of the concrete obtained through the method is 30% or more less thanthat of foam concrete, so the effect is significant, and the method is helpful for the promotion and application of the concrete in practical engineering.

Description

technical field [0001] The invention belongs to the technical fields of building materials and civil engineering, and in particular relates to a method for preparing and testing foamed concrete mixed with rubber aggregates. Background technique [0002] Concrete is a gas-liquid-solid three-phase material, and its cementitious material is mainly cement. The cement hydration process forms a large number of capillary pores, and the loss of water in the unsaturated air causes the material to shrink. Compared with ordinary concrete, foamed concrete has the characteristics of less aggregate and higher porosity, and the difference in internal structure causes the shrinkage rate of foamed concrete to far exceed that of ordinary concrete. In practical application, the application of foam concrete is seriously restricted by the cracking, hollowing and other diseases caused by the shrinkage of foam concrete. [0003] At present, domestic and foreign studies on the shrinkage propertie...

AI Technical Summary

Problems solved by technology

Among them, the research on the aggregate is mainly to add polypropylene fiber, expanded perlite, ceramsite, polystyrene particles, etc. to the foamed concrete to reduce its shrinkage, but the effect is not ideal.

In practical engineering applications, there are still limitations

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