瓯江大桥混凝土回弹法专用测强曲线研究  

Study on special strength curve of rebound method for concrete evaluation of Oujiang River Bridge

作　　者：刘汉勇[1,2] 赵尚传[1] 王建生[3] 

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]清华大学,北京100084 [3]河南理工大学,河南焦作454000

出　　处：《土木工程学报》2015年第1期41-48,共8页China Civil Engineering Journal

基　　金：浙江省交通运输厅科技计划项目(2012H24)

摘　　要：为建立瓯江大桥混凝土回弹法专用测强曲线,通过试验系统研究掺合料用量及掺加方式(单掺或双掺)以及混凝土碳化深度对混凝土回弹值与抗压强度关系的影响,并分别使用ZC3-A型普通回弹仪和H450型高强回弹仪建立了瓯江大桥混凝土回弹法专用测强曲线。试验结果表明:当粉煤灰掺量在35%以内、矿粉掺量在50%以内时,混凝土回弹值与立方体抗压强度的关系不受掺合料用量及掺加方式(单掺或双掺)的影响;当混凝土强度等级在C80及以下且混凝土龄期在1年内时,使用普通回弹仪建立的不考虑碳化深度的测强曲线公式既可对普通混凝土进行强度检测,又可对高强混凝土进行强度检测,使用方便且精度较高。最后,通过现场试验验证所建立的测强曲线公式可作为瓯江大桥混凝土强度无损检测的依据。A series of experiments were carried out to investigate the effects of mixing quantities,admixture mixing ways( single-mixed and double-mixed) and carbonized depth in concrete on the relationship of concrete rebound values and compressive strength. Moreover,the special concrete strength curves for Oujiang River Bridge are established based on the test results with ZC3-A normal rebound instrument and H450 high-strength rebound instrument,respectively. The experimental results indicate that mixing quantities and mixing ways( single-mixed and double-mixed) of admixtures have no influence on the relationship of concrete rebound values and compressive strength when fly ash content is less than 35% and ground slag content is less than 50%. The strength curve equation without consideration of carbonized depth can be used to evaluate the concrete strength of concrete below grade C80 and in 1-year concrete age. Finally,the field test results show that the established special strength curves can be used as basis for the non-destructive test of concrete strength in Oujiang River Bridge.

关 键 词：瓯江大桥 回弹法 专用测强曲线 掺合料 

分 类 号：U445.57[建筑科学—桥梁与隧道工程]