Zhuo Ke-Xian, Liu Guo-Tao, Lan Xue-Wei, Zheng Dong-Ping, Wu Si-Quan, Wu Pei-Zong, Guo Yong-Chang, Lin Jia-Xiang
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Guangdong GW Metal Industry Group Co., Ltd., Guangzhou 510030, China.
Materials (Basel). 2022 Mar 18;15(6):2243. doi: 10.3390/ma15062243.
The influence of different replacement ratios of steel-slag powder as cement-replacement material on the fracture performance of concrete is studied in this paper. A three-point bending fracture test is carried out on slag powder-cement-based concrete (SPC)-notched beams with steel-slag powder as cementitious materials, partially replacing cement (0%, 5%, 10%, 15%, and 20%). Load-deflection curves and load-crack-opening displacement curves of SPC-notched beams with five different replacement ratios of steel-slag powder were obtained. The effects of different steel-slag-powder replacement ratios on the fracture properties (fracture energy, fracture toughness, and double-K fracture parameters) of the SPC were analyzed and discussed. The results showed that the incorporation of appropriate steel-slag powder can affect the fracture performance of SPC. Compared with concrete without steel-slag powder, adding appropriate steel-slag powder can effectively improve the bond performance between aggregate and matrix because the steel-slag powder contains hydration activity substances such as calcium oxide and aluminium trioxide. The fracture energy and fracture toughness of SPC increased and then decreased with the increase in steel-slag-powder replacement ratios, and the SPC concrete showed best fracture performance with a 5% steel slag powder replacement ratio. Its fracture energy increases by 13.63% and fracture toughness increases by 53.22% compared with NC.
本文研究了钢渣粉作为水泥替代材料的不同替代率对混凝土断裂性能的影响。以钢渣粉为胶凝材料，对部分替代水泥（0%、5%、10%、15%和20%）的矿渣粉 - 水泥基混凝土（SPC）缺口梁进行了三点弯曲断裂试验。得到了钢渣粉替代率为五种不同值的SPC缺口梁的荷载 - 挠度曲线和荷载 - 裂缝开口位移曲线。分析和讨论了不同钢渣粉替代率对SPC断裂性能（断裂能、断裂韧性和双K断裂参数）的影响。结果表明，掺入适量钢渣粉会影响SPC的断裂性能。与不含钢渣粉的混凝土相比，添加适量钢渣粉可有效改善骨料与基体之间的粘结性能，因为钢渣粉含有氧化钙和三氧化二铝等水化活性物质。SPC的断裂能和断裂韧性随钢渣粉替代率的增加先增大后减小，钢渣粉替代率为5%时SPC混凝土的断裂性能最佳。与NC相比，其断裂能提高了13.63%，断裂韧性提高了53.22%。
