| 摘要: |
| 采用微型陶瓷头和GSM无线监测技术，实现了混凝土表层孔隙负压自成型开始的远程、自动和实时监控.在此基础上，提出了基于孔隙负压信号的混凝土早期养护方法，并对养护的效果进行了评价.结果表明：以孔隙负压2kPa作为养护开始时间并进行相应的早期养护，可有效避免掺硅灰混凝土在严酷水分蒸发（水分蒸发速率1.3~2.6kg/（m2·h-1））条件下的塑性收缩开裂，降低表层混凝土的渗透性；相比较而言，喷雾是最好的早期养护方式. |
| 关键词: 混凝土 养护 硅灰 塑性开裂 孔隙负压 耐久性 |
| DOI：10.3969/j.issn.1007 9629.2013.04.006 |
| 分类号: |
| 基金项目:国家杰出青年科学基金资助项目（51225801） |
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| An Initial Curing Procedure for Concrete Based onPore Water Pressure Measurement |
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TIAN Qian, WANG Yu jiang, LI Lei, LIU Jia ping
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State Key Laboratory of High Performance Civil Engineering Materials, JiangsuResearch Institute of Building Science Co., Ltd., Nanjing 210008, China
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| Abstract: |
| A mini type ceramic sensor was introduced and a wireless monitoring system based on GSM technology was developed for the automatic long range, real time monitoring of the pore water pressure(PWP) within the surface layer of fresh concrete. An initial curing procedure for cementitious materials was proposed and its curing efficiency was studied. Results indicate that proposed initial curing procedures(taking 2kPa of PWP as the threshold of initial curing) can prevent concrete with silica fume from plastic shrinkage cracking under severe evaporation condition(evaporation rate 1.32.6kg/（m2·h-1）) and improve the surface durability of concrete. Fogging is recommended as most effective procedure for initial curing. |
| Key words: concrete curing silica fume plastic cracking pore water pressure durability |
