期刊
CEMENT AND CONCRETE RESEARCH
卷 75, 期 -, 页码 42-52出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2015.04.004
关键词
Fracture toughness C; Material properties; Hydration A; Aging C
资金
- Concrete Sustainability Hub (CSHub) at MIT
- Portland Cement Association (PCA)
- RMC Research & Education Foundation
The risk of early-age fracture of cementitious materials in ever more challenging environments provides a unique opportunity to employ an experimental chemo-mechanical platform to develop functional relations between hydration degree, fracture and strength properties, assessed by isothermal calorimetry, micro-scratching, splitting and microindentation on white cement paste at various curing ages from 7 h to 28 days. We show that the modulus, tensile strength, fracture toughness and energy all evolve with a natural logarithmic dependence on the hydration degree. These trends are linked to the densification of the material during the hydration process, explained by compaction mechanics and free volume theory. We show that while the fracture process zone size is essentially constant during the hydration process, the ductility of the material, quantified by M/H, decreases, and is consistent with the evolution of K-c/H. Both quantities provide a convenient way to experimentally assess the fracture sensitivity of early-age cement-based. materials. (C) 2015 Elsevier Ltd. All rights reserved.
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