# Study on the Performance of Foam Concrete Prepared from Decarburized Fly Ash
## 4 Conclusions  
The purpose of this paper is to prepare decarburized fly ash using high carbon fly ash raw ash and combine it with foam concrete. While improving the resource utilization rate of fly ash, the related properties of foam concrete are improved. Finally, the following conclusions are drawn:  
1. The decarburized fly ash obtained from the grinding-flotation treatment of raw high carbon fly ash using mechanical activation and a kitchen waste oil trapping agent meets the requirements for the use of Class I fly ash, with the exception of the water demand ratio.  
Figure 10: SEM analysis of H2 (a) H2-1 (b) H2-3 (c) H2-6.  
Figure 9: (a) Thermal conductivity of foam concrete with different fitting ratios (b) Thermal conductivity of different types of foam concrete.  
2. With the increase in the water-to-cement ratio and DFA substitution rate, the setting time of the composite cementitious materials and the porosity of the foam concrete showed an increasing trend.
3. With the increase in the water-to-cement ratio and DFA substitution rate, the dry density, compressive strength and thermal conductivity of the foam concrete all show a decreasing trend.
4. The dry density and thermal conductivity of the prepared foam concrete can meet the requirements of A05 grade foam concrete. The compressive strength can meet the requirements of C0.3 grade foam concrete.
5. SEM analysis verified that the deterioration of the foam concrete performance was caused by the deterioration of the Aft morphology, the reduction in hydration products and the weakening of the DFA \"secondary hydration reaction\".
6. It can be seen from the SEM that the morphology of the decarbarized fly ash is irregular, and there are a few round microbeads similar to those of fly ash. This is also reflected in the higher water demand ratio of decarbarized fly ash than Class I fly ash. This leads to the poor workability of concrete prepared with decarbarized fly ash compared to normal concrete. The decarbarized fly ash will partially replace cement to prepare recycled concrete, study its mechanical properties, thermal insulation properties, durability performance, and make a comparison with Class I fly ash. This will be a key factor for whether decarbarurized fly ash can be widely used.  
Data curation, Y.G. and C.X.; formal analysis, Z.H. and L.W.; methodology, G.Y.; resources, S.Z. and P.W.; software, P.W.; writing--original draft, Y.G.; writing--review & editing, Q.L. All authors have read and agreed to the published version of the manuscript.  
This research was funded by [National Natural Science Foundation of China] grant numbers [51878366, 51978353, and 52078261]. This research was funded by [Natural Science Foundation of Shandong Province] grant numbers [ZR2019 PEE007 and ZR2020 ME036]. This research was funded by [Major Science and Technology Innovation Project of Shandong Province] grant number [2021 SFGC0201-04]. This research was funded by [Municipal School Enterprise Cooperation Project] grant numbers [2422243, 2421073, and 2419133]. This research was funded by [Qingdao Municipal Government Procurement Project] grant numbers [ZFCG2019000063 and ZFCG2022007092]. This research was funded by [Qingdao Science and Technology Demonstration and Guidance Project] grant number [20-3-4-10-nsh].  
This statement is not required for my study.  
Not applicable.  
The study did not report any data.  
The authors declare no conflict of interest regarding the publication of this paper.  
The following abbreviations are used in this manuscript:  
\begin{tabular}{l l} HCFARA & High carbon fly ash raw ash \\ HBSAC & High-belite sulfoaluminate cement \\ DFA & Decarbarurized fly ash \\ \end{tabular}