# Study on the Performance of Foam Concrete Prepared from Decarburized Fly Ash
## 1 Introduction
[PERSON] [9] carried out the proportional design of self-compacting concrete and aggregate-free concrete with high admixture levels. The 28d compressive strength of both concretes reached 60 MPa when the fly ash admixture was 80%. [PERSON] [10] used rice husk ash, silica fume and fly ash to partially replace cement. While exploring the microscopic aspects, it was also found that the prepared concrete could meet the requirements of the relevant codes for compressive strength and porosity. Fly ash concrete is also more widely used in practical engineering, and [PERSON] et al. [11] examined its members such as beams and slabs and found that the deflection characteristics and cracking patterns of fly ash concrete are similar to those of ordinary concrete. It was also found that the addition of fly ash reduced the chloride ion attack on reinforced concrete [12]. In addition, other researchers have found that the effect of fly ash on concrete-related properties gradually decreases as the water-to-cement ratio increases [13]. In summary, it is clear that the research and utilization of fly ash should continue. The cementitious material of foam concrete is usually cement, but to reduce cost and relieve environmental pressure while improving its performance in all aspects, fly ash can be considered to partially replace cement. [PERSON] [14] coated the surface of sodium alginate beads with fly ash, thereby synthesizing a new type of inorganic bubbles and partially replacing them with fine aggregates to prepare foam concrete. This demonstrates that the compressive strength and thermal conductivity of the foam concrete prepared by using the new bubbles were 53.8% and 81.1% higher than those of ordinary concrete of the same density class. [PERSON] [15] found that mixing with a certain amount of fly ash can significantly improve the compressive and flexural strength of aerated concrete. [PERSON] [16] found, after two years of follow-up tests, that the addition of fly ash resulted in a decrease in concrete strength, but noted little change in thermal conductivity. [PERSON] [17] prepared a foam concrete mixed with large amounts of lime mud and fly ash. It was found that the addition of lime mud and fly ash reduced the mechanical properties and drying shrinkage of the concrete, and [PERSON] [18] came to a similar conclusion. [PERSON] [19] studied the effect law of hydrogen peroxide admixture on fly ash foam concrete using the chemical foaming method. It was found that the dry density, strength and thermal conductivity of the concrete decreased with the increase in the blowing agent admixture. It was also found that when the H\({}_{2}\)O\({}_{2}\) admixture was in the range of between 5.5 and 7.5%, it caused a significant increase in the pore size. The above-mentioned utilization of fly ash is not well purified. [PERSON] [20] found that the content of decarbarized fly ash above 45 \(\upmu\)m was greater than 12%, which could not meet the requirements for the use of Class I fly ash. In addition, polished fly ash can significantly improve the strength of fly ash concrete. In fly ash decarbonization technology, [PERSON] [21] conducted a kinetic analysis of charged fly ash particles, which can effectively improve the efficiency of decarbonization. In summary, there is still relatively little research on high carbon fly ash decarbonization technology. In addition, in some areas, the fly ash with a high carbon content generated due to technical limitations cannot be effectively utilized. In contrast to previous studies, modified kitchen waste oil is used as a novel trapping agent in this paper. This can not only effectively improve the utilization rate of kitchen waste oil, but, additionally, its ability to change the hydrophobicity of mineral surface far exceeds that of traditional petrochemical-based trapping agents (kerosene). Thus, a decarbarized fly ash with a comparable performance to Class I fly ash was obtained.