期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 187, 期 -, 页码 348-359出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.07.168
关键词
Soundless Chemical Demolition Agent; Expansive cement; Ambient temperature; Borehole diameter; Non-expansive demolition agent; Thermal transfer; Bristar; Heat of hydration; Volumetric expansion; Expansive pressure
资金
- Science Foundation Ireland [12/ERC/12534]
- Enterprise Ireland [IP20150410Y]
This paper explores thermal transfer effects in Soundless Chemical Demolition Agents (SCDA). In a 10 degrees C water bath, quadrupling the volume of SCDA in a pipe accelerated peak hydration onset and resulted in a 700% increase in expansive pressure and a 20% increase in volumetric expansion. An equivalent sample in a constant temperature chamber showed an almost 5 degrees C greater hydration heat than in the water bath, which resulted in a six-fold expansive pressure difference after 4 days of testing and an order of magnitude more pressure in the first 24 h, thereby demonstrating limitations of previous SCDA experimental work and providing a temperature-based reason for discrepancies between large-scale testing and manufacturers' predictions. Since most construction projects have scheduling requirements, understanding how to achieve sufficiently high pressures within a single work shift is important for evaluating the field viability of SCDAs on a particular project. (C) 2018 Elsevier Ltd. All rights reserved.
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