（中国建筑科学研究院有限公司， 北京 100013）

［摘要］灌浆料强度是影响套筒灌浆连接性能的重要因素，为研究小直径芯样法检测灌浆料实体强度，通过采用不同设计强度、调整加水量和选择试验龄期等三种方式，设计制作不同强度的标准试件和小直径圆柱体试件进行抗压强度试验。结果表明：在相同条件下，小直径圆柱体的抗压强度试验值比标准试件的抗压强度值低；小直径圆柱体试件抗压强度试验值与其破坏形态有关，圆锥体破坏时抗压强度最高，局部压碎破坏时抗压强度最低；不同品牌灌浆料标准试件的抗折强度差异较大；小直径圆柱体试件抗压强度值较好地服从正态分布；采用二次多项式函数建立小直径圆柱体试件强度与标准试件强度换算关系的拟合度最好；当样本容量大于15时，小直径圆柱体试件强度的均值、标准差和变异系数均趋于稳定。试验结果为检测标准的制订提供基础数据和参考依据。

［关键词］套筒灌浆料； 抗压强度； 小直径芯样； 标准试件； 换算关系

中图分类号：TU758-14, TU375文献标识码：A文章编号：1002-848X(2018)23-0001-06

Experimental study on testing entity strength of grout for sleeve splicing with tiny core method

Mao Shiyang, Sun Bin, Zhang Renyu, Zhao Yang, Liu Wenliang

(China Academy of Building Research, Beijing  100013， China)

Abstract:The grout strength is an important factor affecting the performance of grouted sleeve splicing of reinforcing bars. In order to research the compressive  strength of grout by tiny core method, three ways including different design strength, adjusting the water ratio and curing different days were adopted, and standard  specimens of different strengths and tiny diameter core specimen were designed and manufactured for compressive strength test. The results show that under the same condition, the characteristic compressive strength of tiny diameter core specimen is lower than that of standard specimen. The compressive strength of tiny diameter core specimen is relevant with the destructive shape. When the cone destruction occurs, the compressive strength is the highest, and when the partial crushing happens, it is the lowest. There is diverse flexural strength of grout produced from different manufactures.  It shows that the statistic results of tiny diameter core specimen′s compressive strength are well compatible with the normal distribution. It is the optimal way to employing the quadratic polynomial to fit the conversion relationship of strength between tiny diameter core specimen and standard specimen. When the number of specimen is larger than 15, the trend of mean strength, sample deviation and coefficient of variation about tiny diameter core specimen are going stable. The experimental results are contributed to the foundation of the draft on the standard about testing entity strength of grout.

Keywords:grout for sleeve splicing; compressive strength; tiny core; standard specimen; conversion relationship

*国家重点研发计划项目（2016YFC0701800），中国建筑科学研究院应用技术研究课题（20150112330730050）,住房和城乡建设部科技项目（2016-k5-043)。

作者简介：毛诗洋，硕士，工程师，Email：maoshiyang89@126.com。