期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 96, 期 -, 页码 346-352出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2015.08.012
关键词
Magnesium phosphate cement; Fly ash; Mechanical properties; Fracture energy
资金
- Program for New Century Excellent Talents in University - China [NCET-12-0605]
- Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions [CITTCD20150310]
- State Key Laboratory of Solid Waste Reuse for Building Materials
The mechanical properties and fracture toughness of magnesium phosphate cement (MPC) were studied in this paper. The results show that the strengths (compressive, flexural, axial tensile and splitting strengths) of MPC increased rapidly over curing ages and then increasing rates slowed down. The compressive strength increased with the addition of fly ash, while the tensile strength decreased. For both the specimens with and without the addition of fly ash, the axial tensile strength was lower than the splitting strength. The axial tensile strength of MPC without fly ash was 1/13-1/10 of compressive strength and the axial tensile strength of MPC with fly ash is 1/17-1/14 of compressive strength. The ratio decreased over time. The load-deflection curve showed the failure mode of MPC is brittle failure. The fracture energy increased over time, while the value was relatively small. The failure load and the corresponding mid-span deflection of MPC decreased in presence of fly ash, which results in the further decrease of fracture energy of MPC. (C) 2015 Elsevier Ltd. All rights reserved.
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