1 School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China 2 School of Materials Science and Engineering, Tongji University, Shanghai 201804, China 3 School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 4 China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Abstract: Magnesium phosphate cement (MPC) is a new type of inorganic cementitious material with many advantages such as short setting time, high early strength and good bonding performance. However, MPC-based composite materials have brittle properties and low strain capacity. Engineered cementitious composites (ECC) is prepared by using high-performance fibers to improve the toughness of cement-based composites. Through fiber toughening technology, ultra-high toughness magnesium phosphate cement-based composites (UHTMC) with excellent properties of MPC and ECC can be prepared. Here, through the axial tensile test, it is confirmed that the UHTMC has excellent tensile performance, strain hardening and obvious multi-cracking behavior. The effects of fly ash (FA) (substitution amounts:0%, 15%, 30% and 45%) and curing ages (14 d and 28 d) on the mechanical properties of UHTMC under compression were analyzed by the axial compressive strength, ultimate compressive strain, compressive elastic modulus and Poisson's ratio of the specimens. The results show that the UHTMC specimens exhibit good compressive toughness. With the increase of FA substitution amount and curing age, the axial compressive strength and compressive elastic modulus also increase, but the ultimate compressive strain decreases, and the Poisson's ratio changes little. Through the axial compression stress-strain curve of UHTMC, the constitutive relation model of axial compression is proposed and established. Finally, the influence mechanism of FA substitution amount and curing age on the macroscopic mechanical properties of UHTMC under compression was analyzed at the micro level.
通讯作者: *郭奥飞,郑州大学土木工程学院副研究员、硕士研究生导师。2013年6月和2016年6月分别于河南工业大学和湖南大学获得工学学士学位和硕士学位,2020年12月于美国路易斯维尔大学获工学博士学位。目前主要从事木质纤维素生物质对水泥基材料性能影响的研究工作,以第一或通信作者发表SCI论文20余篇,包括Cement and Concrete Composites,Industrial Crops and Products、Construction and Building Materials等期刊。a0guo003@zzu.edu.cn
作者简介: 冯虎,郑州大学土木工程学院教授、博士研究生导师。2004年6月和2007年6月于郑州大学获得工学学士学位和硕士学位,2010年10月于同济大学获工学博士学位。目前主要从事绿色纤维复合建筑材料与结构方面的研究工作,以第一或通信作者发表SCI论文40余篇,包括Cement and Concrete Composites、Construction and Building Materials等期刊。
引用本文:
冯虎, 闵智爽, 郭奥飞, 朱必洋, 陈兵, 黄昊. 超高韧性磷酸镁水泥基复合材料压缩力学性能研究[J]. 材料导报, 2024, 38(17): 23090058-12.
FENG Hu, MIN Zhishuang, GUO Aofei, ZHU Biyang, CHEN Bing, HUANG Hao. Study on Mechanical Properties of Ultra-high Toughness Magnesium Phosphate Cement-based Composites Under Compression. Materials Reports, 2024, 38(17): 23090058-12.
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2024, Vol. 38 
