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SAP对火山灰混凝土收缩性能的改善作用
Improvement of SAP on Shrinkage Performance of Pozzolanic Concrete
投稿时间:2017-08-29  修订日期:2017-11-28
DOI:103969/j.issn.1007 9629201804008
中文关键词:  火山灰混凝土  高吸水树脂  自收缩  干燥收缩  水分损失
英文关键词:pozzolanic concrete  super absorbent polymer(SAP)  autogenous shrinkage  drying shrinkage  water loss
基金项目:“十三五”国家重点研发计划项目(2016YFC0701000)
           
作者单位
张蕊
ZHANG Rui
中国建筑科学研究院有限公司中国建筑技术集团有限公司,北京100013
China Building Technique Group Co., Ltd., China Academy of Building Research Co., Ltd., Beijing 100013, China
周永祥
ZHOU Yongxiang
中国建筑科学研究院有限公司建研科技股份有限公司,北京100013
CABR Technology Co., Ltd., China Academy of Building Research Co., Ltd., Beijing 100013, China
高超
GAO Chao
中国建筑科学研究院有限公司建研科技股份有限公司,北京100013
CABR Technology Co., Ltd., China Academy of Building Research Co., Ltd., Beijing 100013, China
夏京亮
XIA Jingliang
中国建筑科学研究院有限公司建研科技股份有限公司,北京100013
CABR Technology Co., Ltd., China Academy of Building Research Co., Ltd., Beijing 100013, China
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中文摘要:
      研究了高吸水树脂(SAP)对C40和C60火山灰混凝土自收缩、干燥收缩及水分损失率的影响,并探讨了SAP对火山灰混凝土收缩性能的作用机理.结果表明:SAP内养护可以显著降低C40和C60火山灰混凝土的自收缩,提高火山灰混凝土的抗裂性,且内养护减缩率与内养护水胶比呈正比关系;SAP内养护增大了火山灰混凝土的干燥收缩和水分损失率,且增大幅度随着内养护引入水量的增加而增大;根据干燥环境中火山灰混凝土的水分损失率与干燥收缩的拟合关系得出了火山灰混凝土产生干燥收缩时的临界水分损失率;虽然SAP内养护增大了火山灰混凝土的干燥收缩,但其总收缩较基准混凝土显著降低.
英文摘要:
      The influence of internal curing technology by super absorbent polymer(SAP) on the properties ( e.g. autogenous shrinkage,drying shrinkage and water loss rate) of C40 and C60 concrete with natural volcanic ash were analyzed. The results show that internal curing with SAP can significantly reduce the autogenous shrinkage of C40 and C60 pozzolanic concrete, improve the crack resistance of pozzolanic concrete, and the fitting relationship between autogenous shrinkage reduction rate and internal curing water binder ratio is obtained. Internal curing with SAP increases the drying shrinkage and water loss rate of pozzolanic concrete. Increase in amplitude is enlarged as the quantity of internal curing water increases. Based on the fitting relationship between water loss rate and dry shrinkage of pozzolanic concrete in dry environment, the critical water loss rate of pozzolanic concrete during drying shrinkage is obtained. Although internal curing increases the drying shrinkage of pozzolanic concrete, the shrinkage performance is superior to that of control concrete.
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