摘要
采用两种方法对早龄期推定混凝土强度进行研究。方法一是计算式修正法,经过验证,传统早龄期强度推定式f_(28)=f_(n)lg_(28)/lg_(n)已经不再适用于现代混凝土,通过数据分析,对传统推定式修正,得到了新的3 d、7 d推定28 d强度的推定式;方法二是采用SPSS对混凝土进行回归分析,分析结果为强度等级和7 d强度两个变量与混凝土的强度相关性最好,得出了7 d推定28 d强度的回归分析式。使用北京市某预拌混凝土企业的实际生产配合比进行实际验证推定式,共进行了570组样本的验证。结果表明:使用方法一进行推定时,3 d推定值误差较大,7 d推定误差小;使用方法二进行7 d强度的推定时,推定误差最小。在实际生产使用中,可以优先使用回归分析式进行早龄期推定。
Two methods were used to study the estimated concrete strength at early ages.Method one is the formula correction method.After verification,the traditional early age strength estimation formula f_(28)=f_(n)lg_(28)/lg_(n) is no longer applicable to modern concrete.Through data analysis,the traditional estimation formula was revised,and a new estimation formula for 3 d,7 d and 28 d intensity was obtained.The second method is to use SPSS to conduct regression analysis on concrete.The analysis results show that the two variables,strength grade and 7 d strength,have the best correlation with the strength of concrete.The regression analysis equation for 7 d to estimate 28 d strength is obtained.The actual production mix ratio of a certain commercial concrete in Beijing was used to actually verify the presumed formula,and a total of 570 sets of samples were verified.The results show that when method one is used for estimation,the 3 d estimation value error is larger,and the 7 d estimation error is smaller;When method two is used for estimation of 7 d intensity,the estimation error is the smallest.Both methods can be used to predict the quality of concrete production.
作者
焦立颖
宋少民
张孟然
许子敬
易云朝
张全贵
万维福
JIAO Liying;SONG Shaomin;ZHANG Mengran;XU Zijing;YI Yunchao;ZHANG Quangui;WAN Weifu(Beijing Key Laboratory of Cement Concrete Energy Saving and Waste Recycling Technology,Beijing Jinyu Concrete Co.,Ltd.,Beijing 100096,China;Civil Engineering and Architecture,Beijing University,Beijing 100044,China;Shanghai Baoye Group Co.,Ltd.,Shanghai 200941,China)
出处
《混凝土》
北大核心
2025年第10期35-39,47,共6页
Concrete
基金
北京建筑大学市属高校基本科研业务费专项资金(X18255)
北京未来城市设计高精尖创新中心研究项目(X20012)。
关键词
混凝土
发展规律
早龄期推定强度
concrete
law of development
presumptive strength at early age
