Li Linhao, Long Guangcheng, Ma Kunlin, Ma Hongwei, Wang Wenbing, Zhang Cheng, Xie Youjun
School of Civil Engineering, Central South University, Changsha 410075, China.
Electrification Bureau (Zhengzhou), China Railway Signal & Communication Co., Ltd., Zhengzhou 450000, China.
Materials (Basel). 2020 Feb 2;13(3):664. doi: 10.3390/ma13030664.
Effective foundation reinforcement treatment is essential for modern large and complex infrastructure, while it is significant for developing new green high-performance materials for foundation reinforcement. This study investigates a new green concrete by using high volume fly-ash and coal gangue aggregates, which is expected to apply for foundation treatment of modern infrastructure with high loading-bear ability. In this experiment, 12 mix proportions of fly ash coal gangue mixture (the material name, abbreviated FGM) were designed, and its mechanical properties and durability performance were investigated. The mechanical properties of FGM include compressive strength, dynamic elastic modulus, dynamic shear modulus, Poisson's ratio, and the stress-strain behaviors. The durability performance was evaluated by the parameters of acid resistance, which simulated an acid circumstance. After that, the environmental effects about carbon emission of this material were also investigated. Results show that the FGM with 84.6% wastes utilizing rate is a cost-effective material for foundation reinforcing treatment. Its compressive strength at 28 days and 60 days can reach more than 8 MPa and 10 MPa, respectively. After being immersed in the acid environment for 140 days, the mass loss (%) of the material could be under 3.5%. The greenness shows that the e-CO indices of FGM are lower than 20 kg/MPa·m, and the e-energy indices are at below 150 MJ/MPa·m. FGM has the advantages of acid resistance, waste recycling, and lower carbon emissions than the previous methods for foundation improvement.
有效的地基加固处理对于现代大型复杂基础设施至关重要，同时开发新型绿色高性能地基加固材料也具有重要意义。本研究通过使用大量粉煤灰和煤矸石集料来研究一种新型绿色混凝土，有望将其应用于具有高承载能力的现代基础设施的地基处理。在本实验中，设计了12种粉煤灰煤矸石混合料（材料名称，缩写为FGM）的配合比，并研究了其力学性能和耐久性。FGM的力学性能包括抗压强度、动态弹性模量、动态剪切模量、泊松比以及应力应变行为。通过耐酸性参数模拟酸性环境来评估耐久性。之后，还研究了该材料碳排放的环境影响。结果表明，废料利用率为84.6%的FGM是一种用于地基加固处理的经济高效材料。其28天和60天的抗压强度分别可达到8 MPa以上和10 MPa以上。在酸性环境中浸泡140天后，材料的质量损失（%）可低于3.5%。绿色度表明，FGM的e-CO指数低于20 kg/MPa·m，e-能量指数低于150 MJ/MPa·m。与以前的地基改良方法相比，FGM具有耐酸性、废料回收利用和较低碳排放的优点。
