回弹测试龄期对混凝土28d强度推定值的影响  

Influence of Rebound Test Age on Presumed 28d Strength of Concrete

作　　者：张锦[1] 严捍东[1] 

机构地区：[1]华侨大学土木工程学院,福建厦门361021

出　　处：《施工技术（下半月）》2011年第11期68-71,共4页Construction Technology

基　　金：泉州市科技计划项目基金资助(2010G26)

摘　　要：针对闽南地区花岗岩机制砂配制不同强度等级的非泵送混凝土试块,按照《回弹法检测混凝土抗压强度技术规程》JGJ/T23—2001的标准方法分别测试14,28,60,90,180,360d混凝土试件的回弹值、碳化深度和实测强度,并选用指定的幂函数模型进行回归分析,建立闽南地区花岗岩机制砂非泵送混凝土回弹法测强曲线。通过系统分析不同强度等级混凝土回弹值、碳化深度和实测强度随龄期变化规律,进一步分析龄期对回弹法测强曲线使用的影响,并提出实际工程中28d强度推定值的误差修正值。In view of south region of Fujian,the non-pumped concrete samples is made with granite machine-made sand at different strength levels.According to the standard method of Technical Regulation of Rebound Method Detecting Concrete Compression Strength JGJ/T23—2001,the rebound values,carbonation depth values and actual strength values are tested at 14,28,60,90,180,360d.The specified power function model is selected for the regression analysis to establish strength-measuring curves of the granite machine-made sand non-pumped concrete in south region of Fujian.Through systematic analysis of different strength levels concrete rebound value,carbonation depth value and actual strength value changing rule with age,the influence of age on strength-measuring curves is further analyzed,and the error correction values of presumed 28d strength in the actual projects are put forward.

关 键 词：混凝土 龄期 回弹法 测强曲线 回弹值 碳化深度 实测强度 试验 

分 类 号：TU755.7[建筑科学—建筑技术科学]