期刊
CEMENT AND CONCRETE RESEARCH
卷 149, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2021.106575
关键词
ASR gel; Climate simulation concrete prism test; ASR kinetics; Microcracks; Micromechanics; Linear elastic fracture mechanics
资金
- German Research Foundation (DFG) [FOR 1498, 165295427]
The impact of ASR on expansion and damage of pavement concrete specimens was studied through experiments and computational modeling. An ASR-induced expansion simulation model was developed based on experimental data, showing that microcracking in aggregate predominantly controls expansion in specimens exposed to water, while specimens subjected to external alkali supply exhibit microcracking in both aggregate and cement paste.
The process of ASR (Alkali-Silica Reaction) induced expansion and damage in pavement concrete specimens is investigated using laboratory experiments and computational modeling. In the experimental program, the concrete specimens are subject to CS-CPT (climate simulation concrete prism test) to obtain ASR induced expansion with and without external supply of alkali. The dissolution rates of the granodiorite used in the concrete mix and the gel formation rates are determined under concrete-like conditions (pH 13.8, with/without Ca(OH)(2) and NaCl) at different temperatures. A micromechanics based computational model with aggregate scale diffusion and reaction kinetics coupled to an Eigenstrain based micromechanics damage model is developed for the simulation of ASR induced expansion and damage. Data from the experimental program are used to calibrate and validate the computational model. Model predictions show that for the given concrete mixture, ASR induced expansion in the specimen exposed to water is predominantly governed by microcracking in the aggregate, while the expansion in the specimen subjected to external alkali supply is governed by microcracking in both the aggregates and the cement paste.
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