Guotai Junan released a research report saying that under the background of carbon neutrality, the scarcity of coal mines is prominent, and the value of assets will continue to increase. The high point of capital expenditure in the coal industry appeared in 2012. Under the general direction of carbon neutrality, the overall investment in the industry has slowed down, and capital expenditure has gradually declined. From 2021 to now, the Energy Bureau of the National Development and Reform Commission has only newly approved 17.4 million tons of concrete foaming agent.
Cement is the main raw material of foam concrete. Because foamed concrete is mostly cured at room temperature and mixed with a large amount of foam, these two points determine its high cement proportion.
This is the fundamental difference between it and aerated concrete. Due to the use of autoclave, aerated concrete mainly depends on the hydration reaction of fly ash and lime under high heat and high pressure to produce gelling, and cement is auxiliary.
When foam concrete is produced at room temperature, active micro-aggregate will not produce hydration reaction quickly, and its foam still depends on the cementation of cement. Therefore, the mix proportion of foam concrete should be cement as the main body and high cement proportion should be adopted.
In general, the amount of cement should account for 50% of the total dry material. 50% should be the minimum limit for curing at room temperature. When pouring on site, the proportion of cement should account for more than 80% of the total dry material. The density of foamed concrete at room temperature is less than 600kg/m3, and the proportion of cement can not be less than 70% of the total material. When the density is less than 400kg/m3, the proportion at room temperature should account for more than 90% of the total dry material.
In the design of cement proportion, the following factors should be considered:
1. The variety of cement. The cement varieties with high early and late strength (such as double fast Portland cement) can appropriately reduce the proportion, while the cement varieties with low late strength or low early strength should increase the cement proportion.
2. The strength grade of cement. The proportion of high strength grade cement can be reduced, while that of low strength grade cement should be increased.
3. The quality of cement. The proportion of the cement of the new dry rotary kiln in the large factory can be reduced appropriately, while the cement in the shaft kiln of the small factory or the cement with a large amount of admixture should be properly increased.
4. The density and strength requirements of foam concrete. The proportion of cement with low density or high strength requirement should be increased, while that with high density or low strength requirement can be reduced.
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