Effect of Recycled Powder and Mineral Admixture on the Mechanical Properties and Microstructure of Concrete
CHEN Lijun1, LI Ying1,*, CHEN Wenhao2
1 School of Civil Engineering, Qinghai University, Xining 810016, China 2 Qinghai Provincial Key Laboratory of Energy Saving Building Materials and Engineering Safety, Xining 810016, China
Abstract: In order to improve the utilization rate of recycled powder in concrete, the mechanical properties and microstructure of single-doped recycled powder concrete and compound recycled powder, fly ash and silica ash concrete were compared. The results show that the single-doped recycled fine powder and the three-way re-mixing have different degrees of influence on the compressive strength and pore structure of the concrete, and when the dosage is less than 20%, the compressive strength of the single-doped recycled fine powder is higher than that of the re-mixed concrete when it was combined, and the porosity was also reduced relative to the re-doping time. When the dosage is higher than 20%, the compounding effect is better than that of single doping, especially when the compounding is 30%, the compressive strength of the concrete in 28 d is increased by 33.4% compared with the single doping by 30%, and the total porosity and the proportion of large pores to total pores are reduced by 4.4% and 17.77%, respectively. This shows that when the amount of recycled powder is incorporated, it will adversely affect the concrete, but after adding fly ash and silica ash, it can play a synergistic effect to improve the composite cement matrix strength and pore structure of the concrete.
陈立俊, 李滢, 陈文浩. 再生微粉与矿物掺合料对混凝土力学性能及微观结构的影响[J]. 材料导报, 2024, 38(5): 22070218-6.
CHEN Lijun, LI Ying, CHEN Wenhao. Effect of Recycled Powder and Mineral Admixture on the Mechanical Properties and Microstructure of Concrete. Materials Reports, 2024, 38(5): 22070218-6.
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2024, Vol. 38 
