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内养护水泥基材料早龄期变形行为
作者:李明1 刘加平2 田倩1 王育江2 王文彬1 
单位:1. 江苏苏博特新材料股份有限公司 高性能土木工程材料国家重点实验室 南京 211103  2. 东南大学材料科学与工程学院 南京 211189 
关键词:高吸水树脂 自收缩 零点 毛细管压力 
分类号:TU528
出版年,卷(期):页码:2017,45(11):0-0
DOI:
摘要:

 利用高吸水树脂(SAP)作为内养护剂抑制水泥基材料的早期收缩开裂已受到广泛研究,然而,掺加SAP 制备的内养护水泥基材料自加水24 h 内的早期变形行为往往被忽略。由于从塑性到硬化阶段的早期变形较为剧烈,导致在此阶段内的自收缩零点选取对测试结果影响较大。研究了掺加3 种不同种类的SAP 浆体的全过程收缩变形、毛细管压力及水化放热速率,结果表明,泌水回吸等因素导致的膨胀变形先于SAP 引起的膨胀变形出现,SAP 的释水历程变化会导致更多的膨胀变形出现。采用维卡仪测试的初凝时间与早期密封条件下的变形速率稳定发展时刻对应较好,毛细管压力发展速率最大时刻与凝结及内应力平衡时刻相对应,更适合作为自收缩测试零点。

 The internal curing effect of superabsorbent polymers (SAP) on the mitigating early age crack for cementitious materials was investigated. However, the detailed deformation of cement pastes containing SAP in the first day after casting is still unclear. The starting point of autogenous shrinkage was determined, and a difference could be obtained at a great deforamtion rate. The whole process shrinkage deformation, capillary pressure and heat evolution of cement pastes containing three kinds of SAP were investigated. The results show that the early age swelling of cement pastes containing SAP occurs due to the reabsorption of bleed water caused by water released from SAP, one or more swelling caused by SAP appears possibly due to the rate of water release process of SAP. The setting time determined by the Vicat method corresponds well to the end of dramatically change of autogenous deformation rate at the early age. The time for the maximum rate of capillary pressure is closely related to the setting and balance of internal self-tensile in cement paste, which can be potentially utilized as time zero to determine the starting point of autogenous shrinkage strain measurement.

基金项目:
国家自然科学基金(NO.51578268,No.51438003);973 计划(No.2015CB655105)
作者简介:
李明(1990—),男,硕士,助理工程师。
参考文献:
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