预拌砂浆拉伸粘结强度检测新方法的试验研究

Research on the bond strength of ready-mixed mortar

拉伸黏结强度是预拌砂浆的重要性能指标,现行JGJ/T 70—2009《建筑砂浆基本性能试验方法标准》规范中采用的拉伸黏结强度试验方法存在无法得到真实拉伸黏结强度的问题。参考环氧砂浆黏结强度试验方法,提出了一种新的预拌砂浆拉伸黏结强度试验方法——8字模法。采用多种预拌砂浆,进行了两种拉伸黏结强度试验方法的对比研究,结果表明:8字模法能更准确地反映预拌砂浆的真实拉伸黏结强度,且数据波动较小,建议将其完善后,作为预拌砂浆拉伸黏结强度试验的标准方法。

The bond strength is the very important performance of ready-mixed mortar.But the bond strength experiment in Standard JGJ/T 70—2009 hardly get the real data of the bond strength.Consulting the bond strength experiment of epoxy mortar,a new method of＂8-pattern＂ was bring forward.By parallel study of two experiments,the method of ＂8-pattern＂ can get the real bond strength and have less fluctuation than the traditional method.Suggest using the method of ＂8-pattern＂ as the bond strength standard method for ready-mixed mortar.