基于流变特性的CA砂浆工作性控制指标研究

关键字：CA砂浆；流变特性；工作性；控制指标

（1.江苏苏博特新材料股份有限公司，江苏 南京  210008；2.高性能土木工程材料国家重点实验室，江苏 南京  210008）
 

    摘要：为了解决现有技术规范在CA砂浆施工过程中指导性不强的问题，运用流变学原理，从可灌注性、分离度及泌水3个因素出发，提出了CA砂浆的工作性控制指标。结果表明：剪切应力分别为40.65 Pa和23.13 Pa时流动度与扩展度的关系曲线是CA砂浆难灌注/可灌注和可灌注/易灌注的界限；屈服应力为5.5 Pa是控制CA砂浆离析的临界值，低于该值的砂浆易离析；流动度小于100 s，扩展度大于340 mm是控制CA砂浆泌水的界限。研究结论可为CA砂浆施工提供理论参考。

    关键词：CA砂浆；流变特性；工作性；控制指标

    中图分类号：TU528.42        文献标识码：A        文章编号：1001-702X（2018）03-0044-04

 

Research on workability parameters of CA mortar based on the rheological properties

ZHANG Lihua1，2，HONG Jinxiang1，2，ZHU Xiaobin2

（1.Jiangsu Sobute New Materials Co. Ltd.，Nanjing 210008，China；

2.State Key Laboratory of High Performance Civil Engineering Materials，Nanjing 210008，China）

  Abstract：To solve the problem of weak guidance of existing technical standards in CA mortar construction process，new workability control parameters were proposed by researching perfusion capacity，segregation and bleeding of CA mortar by using the rheology principle. It indicates that the fluidity and expansion curves are unable to infusion boundary and easy to perfusion boundary respectively when shear stress are 40.65 Pa and 23.13 Pa，the yield stress of 5.5 Pa is critical value of controlling segregation，and it is easy to segregate when yield stress is lower than the value. Too low fluidity（lower than 100 s） and too great expansion degree（greater than 340 mm） lead to bleeding. Conclusions can provide theoretical reference for CA mortar construction.

    Key words：CA mortar，rheological property，workability，control parameters