Pore pressure and explosive spalling in concrete
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- 作者：Long T. Phan (1) long.phan@nist.gov
- 关键词：High ; strength concrete ; Elevated temperature ; Explosive spalling ; Polypropylene fiber ; Pore pressure
- 刊名：Materials and Structures
- 出版时间：December 2008
- 出版年：2008
- 期刊代码：pc541_1359-5997
- 类别：et
- 卷：41
- 期：10
- 页码：1623-1632
- 数据来源：sp
摘要
Results of an experimental study, which measured thermally-induced pore pressure and corresponding concrete temperatures in high-strength concrete (HSC) and normal strength concrete (NSC), to quantify the effects of factors influencing pore pressure buildup and potential for explosive spalling in HSC and NSC are presented. The specimens are 100 脳 200 脳 200 mm concrete blocks, heated to a maximum temperature of 600掳C (1,112掳F) at 5掳C/min (41掳F/min) and 25掳C/min (77掳F/min). The complex heat-induced moisture transport process, which varied with specific levels of concrete temperature and significantly influenced the developments of pore pressure and concrete temperature, is explained. Pore pressure developments are shown to be directly related to the moisture transport process and have a significant influence on occurrence of explosive spalling. Effects of water-to-cementitious materials ratios (w/cm), curing conditions, heating rates, and polypropylene (PP) fibers on pore pressure buildup and explosive spalling are quantified and described.