回弹法检测再生混凝土抗压强度研究
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摘要
针对再生粗骨料取代率分别为0%,30%,50%,70%和100%的150块再生混凝土试块,采用普通混凝土回弹仪进行了抗压强度检测试验研究。研究结果表明,回弹法可以用于再生混凝土抗压强度检测。通过采用多种回归模型进行比较分析,得到了再生混凝土统一测强曲线公式。定量分析表明,其测试精度满足混凝土质量控制要求。为反映再生粗骨料取代率的影响,文中还给出了按再生粗骨料取代率分类的测强曲线及回归方程。最后,对比了再生混凝土与普通混凝土全国统一曲线。结果表明,再生混凝土的表面硬度小于普通混凝土,但其随抗压强度增加的速度快于普通混凝土。
In this paper,the compressive strength of recycled aggregate concrete with different recycled coarse aggregate(RCA) replacement ratios is inspected by rebound method.The test results indicate that it is feasible to inspect the compressive strength of recycled concrete by rebound method.A unified regression formula for inspection of the compressive strength of recycled concrete with different RCA replacement ratios is obtained.The regression formula can meet the requirement of the quality of concrete through regression analysis.In order to reflect the influence of RCA replacement ratio,several regression formulas for each RCA replacement ratio are presented.A comparison about the unified f_(cu)-R_m curves between recycled aggregate concrete (RAC) and natural aggregate concrete(NAC) is made.The results show that the surface hardness of RAC is lower than that of NAC.However,as the compressive strength increases,the improvement of surface hardness of RAC is faster than that of NAC.
In this paper,the compressive strength of recycled aggregate concrete with different recycled coarse aggregate(RCA) replacement ratios is inspected by rebound method.The test results indicate that it is feasible to inspect the compressive strength of recycled concrete by rebound method.A unified regression formula for inspection of the compressive strength of recycled concrete with different RCA replacement ratios is obtained.The regression formula can meet the requirement of the quality of concrete through regression analysis.In order to reflect the influence of RCA replacement ratio,several regression formulas for each RCA replacement ratio are presented.A comparison about the unified f_(cu)-R_m curves between recycled aggregate concrete (RAC) and natural aggregate concrete(NAC) is made.The results show that the surface hardness of RAC is lower than that of NAC.However,as the compressive strength increases,the improvement of surface hardness of RAC is faster than that of NAC.
引文
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[8] 潘承毅,何迎晖.数理统计的原理与方法[M].上海:同济大学出版社,1990.
[9] 周纪芗.回归分析[M].上海:华东师范大学出版社,1990.
[10] 蔡正咏,王忠献,李秀英,等.数理统计在混凝土试验中的应用[M].北京:中国铁道出版社,1988.
[11] 贾 锋,肖建庄,朱伯龙.回弹仪检测硫酸腐蚀后混凝土抗压强度试验研究[J].结构工程师,1996,(1):29 32.
[12] 贾 锋,丛永全,朱伯龙.回弹仪检测高温后普通混凝土抗压强度试验研究[J].四川建筑科学研究,1996,(2):37 41.
[2] 孙振平,谭国强,王新友.再生混凝土技术[J].混凝土,1998,(5):36 40.
[3] TopcuIB.Physicalandmechanicalpropertiesofconcretesproducedwithwasteconcrete[J].CementandConcreteResearch,1997,27(12):1817 1823.
[4] 李为杜.混凝土无损检测技术[M].上海:同济大学出版社,1989.
[5] 侯宝隆,蒋之峰.混凝土的非破损检测[M].北京:地震出版社,1992.
[6] 国家建筑工程质量监督检验中心.混凝土无损检测技术[M].北京:中国建材工业出版社,1992.
[7] 肖建庄,李佳彬,孙振平.再生混凝土的抗压强度研究[J].同济大学学报,2004(已录用,待刊出).
[8] 潘承毅,何迎晖.数理统计的原理与方法[M].上海:同济大学出版社,1990.
[9] 周纪芗.回归分析[M].上海:华东师范大学出版社,1990.
[10] 蔡正咏,王忠献,李秀英,等.数理统计在混凝土试验中的应用[M].北京:中国铁道出版社,1988.
[11] 贾 锋,肖建庄,朱伯龙.回弹仪检测硫酸腐蚀后混凝土抗压强度试验研究[J].结构工程师,1996,(1):29 32.
[12] 贾 锋,丛永全,朱伯龙.回弹仪检测高温后普通混凝土抗压强度试验研究[J].四川建筑科学研究,1996,(2):37 41.
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