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预湿陶砂对混凝土板早期湿度分布及发展的影响
Influence of Pre soaked Light Weight Aggregate on Early Age Interior Humidity Distribution and Development in Concrete Slab
投稿时间:2016-03-23  修订日期:2016-06-14
DOI:10.3969/j.issn.1007 9629.2017.03.002
中文关键词:  预湿陶砂轻骨料  混凝土板  内养护  内部相对湿度  湿度梯度
英文关键词:pre soaked light weight aggregate  concrete slab  internal curing  interior relative humidity  humidity gradient
基金项目:国家自然科学基金资助项目(51478018);国家重点研究发展计划(2016YFC0701003);中冶建筑研究总院有限公司青年科技创新人才项目(YBP2014Ky02)
        
作者单位
韩宇栋
HAN Yudong
中冶建筑研究总院有限公司,北京100088
Central Research Institute of Building and Construction, MCC Group Co., Ltd., Beijing 100088, China
张君
ZHANG Jun
清华大学土木工程系,北京100084
Department of Civil Engineering, Tsinghua University, Beijing 100084, China
紫民
ZI Min
中国人民解放军91058部队,海南三亚572000
91058 Force PLA, Sanya 572000, China
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中文摘要:
      研究了室内单面干燥条件下预湿陶砂轻骨料(PSLWA)掺量(体积分数)及水胶比(质量比)对高、中、低强混凝土板28d内部相对湿度(IRH)分布及发展的影响.结果表明:随PSLWA掺量增大,高、中、低强混凝土板湿度饱和期延长,板湿度水平整体提高,湿度下降延缓,板厚方向上湿度梯度减小,湿度饱和区面积比例增大;引入内养护水约60kg/m3,高、中强混凝土板28d内部相对湿度可维持在92%以上;随基体水胶比降低,PSLWA内养护作用增强,表面干燥影响深度减小;PSLWA不能彻底消除室内单面干燥条件下高、中、低强混凝土板中的表面干燥效应.
英文摘要:
      Influences of pre soaked light weight aggregate(PSLWA) volume fraction and water binder ratio on early age interior relative humidity(IRH) distribution and development of high , moderate and low strength concrete slabs with casting surface exposed to indoor environment were investigated. Results show that with the increase volume fraction of PSLWA, the early age globle IRH of concrete slabs are gradually increased, the duration of humidity saturated stage is noticeably prolonged, the IRH reduction process is delayed and mitigated, the IRH non linear gradients along the slab thickness are reduced, and the ratio of IRH saturated zone is increased. As the internal curing water reaches about 60kg/m3, the globle IRH of high and moderate strength concrete slabs stays above 92% within 28 days. The lower the matrix water binder ratio, the stronger the positive internal curing effect of PSLWA, and the thinner the zone affected by surface drying. However, internal curing by PSLWA could not eliminate the surface drying effect of high , moderate and low strength concrete slabs under indoor dry environment.
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