超声回弹法对混凝土强度早期预测

Early predict of concrete strength by ultrasonic rebound

本文根据合肥地区常用混凝土材料、外加剂、配合比、施工工艺及养护条件,分析不同强度等级混凝土强度随龄期变化特点以及7d龄期与28d龄期混凝土强度相关性。通过测量7d龄期混凝土超声波速和回弹值,根据建立的合肥地区超声回弹测强曲线预测7d早龄期混凝土强度并由此对28d龄期混凝土标准强度进行了推定,应用结果表明能较好符合实际。

According to normal concrete material,admixture,mix proportion of concrete,excavation method and concrete curing condition in Hefei,the varying character of concrete strength with curing age and the correlation between concrete strength of early age and late age are analyzed.According to district ultrasonic rebound curve by measuring ultrasonic and rebound of concrete,strength of concrete that cruing age is 28 days is predicted by early age concrete strength that cruing age is 7 days and the result is accordance with engineering practice.