The influence of cement foaming agents on the quality of foam concrete is extremely critical, and a good cement-blowing agent can make high-quality foam concrete.

The more uniform the foam, the better the bubble diameter should be the same size

The ideal pore size distribution of the pores is as narrow as possible, which means that the pore size of the pores should be as uniform as possible, and the difference should not be too big. This correspondingly requires that the foam should be uniform and not vary in size. Foam bubble diameters can not be the same, but they should be basically similar; the bubble diameter should range as small as possible, and the maximum bubble diameter and the minimum bubble diameter between the difference should not be too large. As mentioned earlier, the requirement of uniformity of the pores formed by the foam can avoid the concentration of compressive stress in the large pores and reduce the compressive strength. If the size of the foam is not uniform, the stress is concentrated in the large bubble, and it is very easy to cause here to become a weak link, the first to crack under pressure.

The higher the foam stability, the better; the longer the foam stabilization time, the better.

The foam with good stability has a tough liquid film and good mechanical strength, which is not easy to break or deform excessively under the extrusion of slurry. In addition, it has self-water retention. The water on the liquid film is not easy to lose under the action of gravity and surface tension, which can keep the thickness and integrity of the foam liquid film for a long time so that the foam can be retained for a long time without bursting.

 1)The stability of the foam has three effects on the air holes: it can make most of the foam not disappear, and be fixed in the foam concrete after the initial setting of the paste, forming air holes. Foam stability is not good, then. Most of a small part of the foam is in the casting after the break. The formation of air holes is very little, or even soon after the casting of the paste collapses, that is, commonly known as collapsing the mold, resulting in a complete failure of the casting.

2)Good stability of the foam: the pulp does not easy to deform too much under the extrusion, there is a certain pressure to maintain its own approximate spherical, and it can ultimately form a good hole shape of the spherical air holes;

3) Stable foam, the liquid film in the pulp, is not easy to rupture is not easy to form because of the rupture of the gas after the formation of connecting holes. Therefore, it finally forms the ideal closed hole. The worse the stability of the foam, the fewer closed holes and the more connected holes. Therefore, the stability of the foam can not be based on the standard of not collapsing after pouring but should be based on the standard of not collapsing after pouring; the final formation of the pores is approximately spherical and not connected. Most people do not collapse after pouring as a measure of foam stability, which is actually a misunderstanding of the minimum standard of foam stability.

Foam stability, in the absence of standard testing instruments to determine the sinking distance, can be measured by the stable bubble time. Steady foam time should meet the needs of the initial setting of the cementitious materials used. The slurry, after the initial coagulation, in order to fix the foam, retains the foam form so that it becomes air holes.

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