Study on the Performance of Foam Concrete Prepared from Decarburized Fly Ash

Abstract

Although the energy structure has been gradually enriched in recent years, China, as the world’s largest producer and consumer of coal, still accounts for more than 50% of resources. Therefore, in this paper, the high carbon fly ash raw ash (HCFARA) was mechanically activated, and the flotation was treated to obtain decarburized fly ash (DFA) with a loss on ignition of 1.18%, water demand ratio of 101% and strength activity coefficient of 74.5%. With the exception of for water demand ratio, the rest meet the national requirements for the use of Class I fly ash. The foam concrete was prepared by partially replacing cement with decarburized fly ash in different proportions and at different water-to-cement ratios (0.3, 0.4 and 0.5) in order to study its dry density, porosity, compressive strength and thermal conductivity. The results show that the porosity of foam concrete grows with the increase in water-to-cement ratio and fly ash replacement rate. In addition, the dry density and thermal conductivity of the prepared foam concrete can meet the requirements of A05 grade foam concrete (Density less than 500 kg/m3, thermal conductivity less than 0.12 W/(m·k)). The compressive strength can meet the requirements of C0.3gradefoam concrete (Minimum use standard).

Structural Formation and Properties of Eco-Friendly Foam Concrete Modified with Coal Dust

“…The addition of ash of more than 40% leads to a fairly strong loss of strength and a significant deterioration in other characteristics. In general, the use of fly ash in foam concrete is justified and, with the correct selection of the formulation, allows one to obtain composites with improved thermal insulation characteristics and lower density while maintaining an acceptable reduction in compressive strength, which is also confirmed by a number of the following studies [23][24][25][26][27].…”

Application of Foamed Concrete and Cold-Formed Steel Decking as Lightweight Composite Slabs: Experimental Study On Structural Behaviour

“…With that condition, a provision of mix design is necessary. Previous researchers such as Othman et al [36], Al Qubro et al [37], Ma et al [38] and Guo et al [39] successfully developed the mix design of foamed concrete with the inclusion of additive materials. Since this experimental study intends to use RHA and PMM, the mix design proposed by Abd Rahman et al [40] was found suitable and thus adopted.…”