水泥砂浆塑性收缩开裂预警机制拓展
作者:
作者单位:

1.同济大学 先进土木工程材料教育部重点实验室,上海 201804;2.上海空间电源研究所,上海 200245

作者简介:

马一平(1960—),男,山东济宁人,同济大学教授,博士生导师,博士. E-mail:ypma1239@sina.com

通讯作者:

马一平(1960—),男,山东济宁人,同济大学教授,博士生导师,博士. E-mail:ypma1239@sina.com

中图分类号:

TU528.572

基金项目:

“十三五”国家重点研发计划资助项目(2016YFB0303200)


Expansion of Early Warning Mechanism for Plastic Shrinkage Cracking of Cement Mortar
Author:
Affiliation:

1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University, Shanghai 201804, China;2.Shanghai Institute of Space Power-Sources, Shanghai 200245, China

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    为预测水泥砂浆塑性开裂并对其进行有效预防,采用平板法与八字模法在前期初步建立的水泥砂浆塑性开裂预警机制的基础上增加了预测方程的开裂影响因素(材料组成、约束度及分层度),并扩大了环境参数的范围,由此对水泥砂浆塑性开裂预警机制进行了拓展.结果表明:室内建立的未掺PVA纤维的素砂浆七元本构方程以及掺PVA纤维砂浆的九元本构方程可有效预测室内外水泥砂浆的开裂状况;将二者及其相应的开裂判据结合起来构成水泥砂浆塑性开裂预警机制,可在准确预测素砂浆开裂状况后,通过掺加适量PVA纤维来有效减少砂浆的开裂,从而为保证施工质量提供了新方法.

    Abstract:

    In order to predict the plastic shrinkage cracking of cement mortar and prevent it effectively, the cracking factors of the prediction equation(composition, constrained degree and segregated degree) were added and the range of the environmental parameter was expanded by flat plate method and eight-character model method based on the initial establishment of early warning mechanism for plastic shrinkage cracking of cement mortar.Thus the early warning mechanism for plastic shrinkage cracking of cement mortar was expanded. The results show that the seven-element constitutive equation of plain cement mortar without fibers and the nine-element constitutive equation of cement mortar with polyvinyl alcohol(PVA) fibers are established which can effectively predict the cracking of cement mortar. In addition, through combining the constitutive equations and their cracking criteria, the early warning mechanism for plastic shrinkage cracking of mortar is established, which can effectively reduce cracking by adding suitable PVA fibers after predicting the cracking condition of plain mortar correctly and ensure a good construction quality.

    参考文献
    相似文献
    引证文献
引用本文

马一平,王琼琼,付杰,朱文豪.水泥砂浆塑性收缩开裂预警机制拓展[J].建筑材料学报,2022,25(4):327-338

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2020-12-23
  • 最后修改日期:2021-04-21
  • 录用日期:
  • 在线发布日期: 2022-04-30
  • 出版日期: