The introduction of pores in foam concrete, on the one hand, gives it lightweight, sound insulation, thermal insulation, high fluidity, and other properties that ordinary concrete does not have. Still, from the perspective of structure and mechanics, it also introduces a large number of defects, which leads to hardened foam Significant reduction in concrete strength. Because the porosity in foam concrete is generally as high as 50-70%, and the pore diameter is mainly above 10um, the intensity of foam concrete is much lower than that of ordinary concrete. Like regular concrete, the strength of foam concrete is not a fixed value. Different types of cement materials, cement dosage, concrete mix ratio, water-cement ratio, foam dosage (that is, different volume mass), concrete superplasticizer, curing system, and the use of other additives affects the strength of foam concrete.
3. Influence of conservation conditions
The curing conditions have a significant impact on the strength and strength development of foam concrete. Foam concrete has relatively large molding water ash, so early curing should be strengthened to prevent the strength from reducing and cracking caused by excessive evaporation of water. When the curing temperature is increased, the hydration speed of the cement is accelerated, and the early development of foam concrete is rapid. The intensity has some adverse effects.
4. The impact of concrete additives
The admixtures involved in Foam concrete are concrete foaming agents, concrete superplasticizer, and stimulants for admixtures. The specific foaming agent has a more significant effect on foam concrete. It is necessary to choose a foaming agent that has small side effects on the system, high foaming ability, and high foam strength. The activator mainly targets the addition of the admixture, which will cause the early strength of foam concrete to decrease. Decrease the magnitude of the reduction, but it will also reduce the ultimate intensity; the concrete superplasticizer mainly allows the system to mix the foam and slurry evenly at a lower water-cement ratio.
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