How Does Cement Foaming Agent Affect The Performance Of Foam Concrete? ?
The cement foaming agents currently on the market are generally divided into synthetic cement foaming agents, animal and plant protein cement foaming agents, composite cement foaming agents, rosin soap cement foaming agents, etc. Each of these types of blowing agents has its own advantages and disadvantages. Among them, synthetic cement foaming agents are used by many people because of their low price, especially in the roof insulation market. The transparent and cheap foaming agents you see fall into this category. The main reason is that the roof insulation market does not pay attention to quality. In the words of the construction company itself, "Roof insulation is a crappy project." However, if this continues, the market will fail sooner or later.
The advantage of animal protein cement foaming agent is that it has good foam stability and closed cell ratio. The foaming power and stability of plant-based cement foaming agents are relatively balanced. Beijing Zhongke Zhucheng combined the advantages of these cement foaming agents to develop and produce a high-performance cement foaming agent-composite cement foaming agent. This cement foaming agent has achieved good results after many years of use.
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, water absorption, pouring height and other properties of foam concrete products. Therefore, when choosing a cement foaming agent, you should not just look at its price, but should consider the cost comprehensively. Cement cost is the main cost of foam concrete. Reducing cement costs is key to reducing the cost of foam concrete. How to reduce cement costs? Cement usage can be reduced by increasing strength. The strength of foam concrete with the same density has increased. If the strength remains unchanged, the amount of cement can be reduced and the density can be reduced, but the original strength can still be achieved. For example, the strength of the originally produced 400 density foam concrete is 0.6mpa, but by increasing the strength, 350 can be used to reach 0.6mpa. In this way, 50 kilograms of cement are saved, the strength is increased, and the thermal insulation performance is also improved. But one of the keys is to choose a good cement foaming agent.
The following is a brief introduction to the impact of cement foaming agents on the performance of foam concrete:
The strength of foam concrete is a key indicator. Foam concrete is a kind of artificial stone that has been foamed. Its density is low and its strength will naturally decrease. And the smaller the density, the greater the strength decreases. How to make foam concrete stronger has become a key factor in improving the performance of foam concrete. Choosing a good cement foaming agent can effectively improve the strength of foam concrete. A good cement foaming agent can form bright closed pores in foam concrete, thereby greatly increasing the density of the foam wall and thereby increasing its strength. Good cement foaming agents can be used at low water-cement ratios. The lower the water-cement ratio, the higher the strength. Currently, many cement foaming agents on the market can only be used under high water-cement ratios. This is the main reason why many construction teams use high water-cement ratios for construction. They look like gruel and are said to be "self-leveling." ", but the strength of foam concrete is sacrificed and becomes a "slag project". The compatibility of the cement foaming agent with the cement also affects its strength. If the cement foaming agent does not match the cement, a common problem is that The foaming agent becomes the isolation layer of the cement.
, forming a "hypothetical" phenomenon. In fact, there is no setting, forming an isolation layer that prevents the cement from fully reacting. The phenomenon shown is that the product is particularly "brittle" and has low strength.
2. Water absorption rate
Many foam concrete products on the market now have very high water absorption rates, some as high as 50%. The reason is that the closed cell ratio of foam concrete is low, and through holes are formed due to poor bubble channeling and poor foam stability of the cement foaming agent. This is all caused by the low closed cell rate of the cement foaming agent, so a good cement foaming agent can make foam concrete products have low water absorption.
3. Pouring height
The pouring height of foam concrete is directly related to the foam stability of the cement foaming agent. The higher the foam stability of the 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.
The key to controlling the density of foam concrete is the amount of foam added, so the factor that directly affects the density is the cement foaming agent. The more stable the foam of the cement foaming agent is, the easier it is to control the density, and the easier it is to make foam concrete with a lower density. On the contrary, the stability of the cement foaming agent is not good, and the design density may be 400, and 500 kg may be poured. It is also possible that the upper and lower densities are different, that is, the density is uneven. This problem is more obvious in wall pouring.
5. Thermal conductivity
The most direct factor affecting the thermal conductivity is the density of foam concrete, and the key factor in density control is the cement foaming agent. Correct a misunderstanding in the industry: It is generally believed that thermal conductivity is directly related to closed cell ratio. In fact, based on our testing of foam concrete test blocks with a density of 200 kg/cubic meter and different closed cell ratios, we found that those with high closed cell ratios are related to closed cells. Thermal conductivity does not differ significantly compared to low porosity (0.059).
To sum up: cement foaming agent affects the strength, water absorption, pouring height, density, thermal conductivity and other performance indicators of foam concrete.
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