里氏硬度法评估套筒灌浆料抗压强度

为研究装配式建筑中钢筋套筒连接灌浆料强度的无损检测技术,设计制作了4组套筒灌浆料试件,测试了其表面里氏硬度和抗压强度.结果表明：套筒灌浆料标准试件的表面里氏硬度服从正态分布,2次测试和对称侧面测试的结果具有重复性;采用剔除2个最大值和2个最小值的方法处理数据,套筒灌浆料表面里氏硬度离散性显著减小,偏差在±20HL;套筒灌浆料表面里氏硬度与其抗压强度具有显著相关性,采用指数回归拟合的综合效果最好.

Evaluation of Compressive Strength of Sleeve Grouting Materials by Using Leeb Hardness Method

In order to study the non destructive testing technology for the strength of grouting material for sleeve connection of reinforcement in prefabricated building, four groups of sleeve grouting material samples with strength at different curing ages were designed and prepared, and their surface Leeb hardness and compressive strength were tested. The results show that the surface Leeb hardness of the standard specimen of sleeve grouting material obeys normal distribution, and the results of two tests and symmetrical side test have repeatability; by eliminating two maximum values and two minimum values, the dispersion of surface Leeb hardness of sleeve grouting materials is significantly reduced, and the deviation is within ±20HL; there is a significant correlation between the surface Leeb hardness of sleeve grouting materials and its compressive strength, and the comprehensive effect of exponential regression fitting is the best.