Funct. Mater. 2022; 29 (3): 401-407.
Investigation on the brittleness of ultra-high strength cement-based materials
1Taizhou Polytechnical College, 225300 Jiangsu Taizhou, China
2Department of Traffic and Municipal Engineering, Sichuan College of Architectural Technology, 610399 Sichuan Chengdu, China
The aim of this paper is to investigate the factors influencing on the brittleness of ultra-high strength cement-based materials (UHSC). A conventional method was applied to prepare UHSC using normal raw materials. The basic mechanical properties including compressive strength, flexural strength, splitting tensile strength, and elastic modulus were measured. Fracture parameters, such as fracture energy and characteristic length, were determined to evaluate the brittleness of UHSC. The results shows that UHSC has high values of compressive strength over 130 MPa and flexural strength over 20 MPa; the fracture energy and characteristic length of UHSC are lower than that of normal concrete, indicating the high brittleness of UHSC. The strength and brittleness decrease with increasing the water-to-binder ratio. High temperature curing can not only increase strength, but also reduce brittleness. The addition of silica fume may be one of the main reasons for the high brittleness of UHSC. The addition of fly ash can significantly improve the mechanical properties and reduce the brittleness of UHSC.
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