What are the effects of admixtures on foam concrete
The U.S. and its allies plan to impose sanctions on more Russian industries and supply chains.
The US government representatives recently visited Europe to consult with allies on strengthening and enforcing sanctions to punish Russia. They also plan to take action to disrupt their critical supply chains.
The US government claims that the sanctions imposed on Russia since the invasion began on February 24 have proved extremely effective, plunging Russia into a financial crisis. The sanctions include a freeze on the Russian central bank's foreign exchange assets, a ban on hard currency transactions by major Russian banks and wealthy individuals, and export restrictions on advanced semiconductors and other technologies. The sanctions have weakened the Russian economy and left the Kremlin with fewer resources.
The volatile international political situations will continue to affect the markets and prices of many commodities like the foam concrete,foaming agent,concrete curing agent.
To study the problem of collapse mode cracking in the cast-in-place foam concrete wall, using ordinary Portland cement, fly ash, and self-made composite foaming agent as the primary raw materials, the admixtures (there are two kinds of admixtures) were studied through single-factor experiments. One is a foaming agent, and the other is concrete curing agent.
According to the characteristics of the foaming agent that the foam pore size can be adjusted freely, and the preparation is atomized and diluted during use. The pore size is more acceptable and uniform (the pore size is less than 1mm). The light foam and slurry are mixed to make a lightweight concrete microporous slurry. The porosity in the slurry accounts for 70% of the total volume of the foamed concrete. The foams in the slurry are closed by a water film. They are not connected, which improves the problem of high water absorption in traditional concrete and improves the frost resistance and impermeability of foam concrete. It has a specific activation effect on fly ash.
The slurry in the pouring and forming stage has self-leveling characteristics, good pore structure, smooth entry into the mold, and rapid thickening and forming. Ensure the stability of expansion and improve the strength of foam concrete blocks. Foamed concrete has excellent properties such as lightweight, heat preservation, heat insulation, sound insulation, etc., and it has low production investment. It can use a large amount of industrial waste residue. Its application is of great significance to building energy conservation and environmental protection, so it will gradually replace concrete construction.
According to previous studies, with the increase of fly ash content, the amount of cement decreases, and the early compressive strength of concrete drops significantly. However, fly ash has pozzolanic activity, and in an alkaline environment, with the increase of concrete age, the compressive strength of high-volume fly ash foam concrete will increase significantly. In addition, the large amount of fly ash dramatically reduces the number of harmful pores, improves the compactness of the slurry structure, and is beneficial to the later strength increase.
In recent years, the application of foamed concrete has developed rapidly, but there are still a series of problems in the cast-in-place foamed concrete insulation wall:
(1) Foam concrete has low strength and is not suitable as a load-bearing wall material;
(2) Prefabricated blocks increase the process and engineering costs;
(3) Dry shrinkage of foam concrete and cracking caused by dry-wet cycle and loose structure, due to the problems of collapsed form and easy carbonization due to the influence of pouring height, seriously restrict the broad application of foam concrete.
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