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1. There are many types of cement foaming agents on the market, mainly including synthetic type, cement foaming agent manufacturer, rosin type, animal and plant protein type, composite type, resin type, and currently there are composite cement foaming agents. There are many types, and the main ingredients of each one are also different. The dilution ratios of different types of foaming agents are different. Generally speaking, synthetic blowing agents must have a high dilution ratio to produce foam. Compared with rosin and animal protein foaming, the dilution factor is lower, so we also remind everyone that when purchasing and using foaming agents, it does not mean that the dilution factor is high, so the dosage is small. What type of foaming agent do you need to distinguish. Taking synthetic foaming agents as an example, they generally need to be diluted hundreds of times, but compared with animals, they will not be diluted 40 times. The amount of foaming agent is small.
2. The concentrations of cement foaming agents of the same type from different manufacturers are also different. Especially now, there is no unified quality execution standard in the domestic foaming agent industry, let alone third-party enforced standards. Therefore, in order to have a price advantage, some manufacturers arbitrarily reduce the concentration of the foaming agent solution to reduce costs. In this way, the original dilution factor must be reduced to achieve a reasonable dilution factor.
3. Different types of foaming equipment will affect the reasonable dilution ratio. Take Beijing Zhongke Zhucheng ZK-FP-30 and ZK-FP-50 cement foaming machines as examples. Both use ZC-12 cement foaming agent. When ZK-FP-50 is used, dilution 50 times has a good effect, but ZK- FP-30 type only needs to be diluted 30 times to achieve the same effect as ZK-FP-50. Therefore, when we determine the reasonable dilution ratio of cement foaming agent, on the one hand, we must refer to the dilution ratio recommended by the manufacturer, and on the other hand, we need to directly test on our own foaming machine to determine the dilution ratio.
Like ordinary concrete, the strength of foam cement is not a fixed value. The use of different types of cementitious materials, cement dosage, concrete mix ratio, water-cement ratio, foam dosage (different volumes and masses), foaming agents, curing systems and other admixtures will affect the strength of foamed cement.
In many people's minds, cement foaming agents only play the role of foaming and reducing density. This idea is very one-sided. Cement foaming agent is actually related to the strength, thermal conductivity, solidification speed, cement foaming agent price, water absorption, pouring height and other properties of foam concrete products. What are the influencing factors of cement foaming agent?
1) Foam density: When the fluidity of the slurry is mainly controlled by the amount of additives (that is, the slurry already has good fluidity), as the water-cement ratio decreases, the strength increases; conversely, it decreases.
Analysis reason: As the water-cement ratio decreases, the amount of free water in the cement decreases, and the water absorption rate of the foam cement decreases, effectively improving the strength of the foam cement; but when the water-cement ratio continues to decrease, due to insufficient water required for cement hydration, It will absorb the moisture in the foam and produce foam, resulting in a reduction in the number of closed bubbles and a decrease in the uniformity of the cement, resulting in a decrease in strength.
2) Foam stability of cement foaming agent: The higher the foam stability of cement foaming agent, the higher the pouring height, and vice versa. The higher the pouring height, the greater the pressure of the slurry on the foam. If the bubble is unstable, it will collapse.
Based on the above situation, the impact of foam cement water-cement ratio on strength is multifaceted. The specific situation should be analyzed and the water-cement ratio should be adjusted to make the internal material structure of the foamed cement uniform and have more closed bubbles. An important way to improve the strength of foam cement.
Learn more about how to use foaming agents
Foaming agents on the market generally have higher concentrations. When Changle cement foaming agent is used, it needs to be diluted with a certain proportion of water into a foaming liquid, and then the foaming liquid is turned into foam. The concentration of foaming liquid is closely related to the foaming effect. Concentration that is too high or too low will affect the foaming effect. Only appropriate concentration can obtain high foaming ratio and high quality foam.
Foamed magnesite cement is different from ordinary foamed concrete. It not only has requirements for the quality of the foam and the fluidity of the slurry, but also requires a scientific and reasonable ratio of magnesium oxide, magnesium chloride and water. Therefore, in the production process of foamed magnesite cement, not only the technical indicators of the foaming agent must be considered, but also the impact of the usage method of the foaming agent and the dilution ratio with water on the proportion of each component of the reaction.
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