Wang Yamin, Hu Shaowei, He Zhen
School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China.
Department of Materials and Structural Engineering, Nanjing Hydraulic Research Institute, Nanjing 210024, China.
Materials (Basel). 2019 Sep 15;12(18):2982. doi: 10.3390/ma12182982.
In this paper, the mechanical and fracture properties of fly ash geopolymer concrete (FAGC) mixed with calcium aluminate cement (CAC) were explored. Fly ash was partially replaced by CAC with 2.5%, 5% and 7.5%. The results exhibit that the mechanical and fracture behaviors of FAGC are significantly influenced by CAC content. Based on the formation of more aluminum-rich gels, C-(A)-S-H and C-S-H gels, with the increase of CAC content, the compressive strength, splitting tensile strength and elastic modulus improved. Meanwhile, the peak load and effective fracture toughness show a monotone increasing trend. In addition, because C-S-H gels absorbed more energy, the fracture energy of FAGC increases. The maximal peak load, double-K fracture toughness and fracture energy reached up to1.79 kN, 4.27 MPam, 10.1 MPam and 85.8 N/m with CAC content of 7.5%, respectively.
本文探究了掺加铝酸钙水泥（CAC）的粉煤灰地质聚合物混凝土（FAGC）的力学性能和断裂性能。用2.5%、5%和7.5%的铝酸钙水泥部分替代粉煤灰。结果表明，铝酸钙水泥含量对粉煤灰地质聚合物混凝土的力学性能和断裂行为有显著影响。随着铝酸钙水泥含量的增加，基于形成更多富铝凝胶、C-(A)-S-H凝胶和C-S-H凝胶，抗压强度、劈裂抗拉强度和弹性模量均有所提高。同时，峰值荷载和有效断裂韧性呈单调递增趋势。此外，由于C-S-H凝胶吸收了更多能量，粉煤灰地质聚合物混凝土的断裂能增加。当铝酸钙水泥含量为7.5%时，最大峰值荷载、双K断裂韧性和断裂能分别达到1.79 kN、4.27 MPam、10.1 MPam和85.8 N/m。
