早龄期推定混凝土强度关系式

Relationship of Early Estimation on Concrete Strength

测试标准养护混凝土早龄期(3d、7d)和后期(28d、90d)抗压强度值,通过回归分析建立混凝土早龄期与后期抗压强度关系式。分析结果表明,混凝土强度发展的规律性随龄期增长趋于明显,7d推定混凝土后期强度关系式相关性明显较3d推定混凝土后期强度关系式相关性好,前者能有效应用于施工过程中的混凝土强度控制;混凝土强度发展规律更接近幂函数分布,幂函数类曲线的相关性相对较好。

The standard curing concrete strength at early age （3d＆amp;7d） and late age （28d＆amp;90d） are tested, and the relationship of concrete compressive strength at early stage and late stage is established through regression analysis. The results show that the developing regularity of concrete strength be-comes obvious with age increase, the correlation of relationship between seventh days and long-term strength is more obvious than relationship between three days and long-term strength and the former one can be effectively used to guide the concrete strength control in construction process. The develop-ment law of concrete strength is more close to the correlation of power function with comparatively excellent correlation of power function curves.