基于等效龄期的粉煤灰混凝土抗压强度计算模型

设计温度跟踪养护系统来模拟实际结构中混凝土所经历的温度历程,通过测试在标准养护条件20℃、恒温50℃和变温养护条件下不同强度等级的粉煤灰混凝土早龄期抗压强度的值,分析温度历程对粉煤灰混凝土早龄期抗压强度的影响。根据混凝土早龄期抗压强度的两个主要影响因素:温度和龄期,引入等效龄期理论建立了粉煤灰混凝土早龄期抗压强度的计算模型,并分析了模型参数。实际结构中的粉煤灰混凝土抗压强度可以通过测定温度场,利用计算模型进行相应龄期的抗压强度计算。研究结果表明,粉煤灰混凝土抗压强度计算模型能够较准确计算结构中粉煤灰混凝土的抗压强度,从而有效指导粉煤灰混凝土的工程应用。

Computational Model of Fly Ash Concrete Compressive Strength Based on the Equivalent Age

Temperature tracking system is designed to simulate the actual curing concrete structure temperature history experienced. By the test standard curing conditions at 20℃, 50℃ constant temperature and variable temperature curing conditions, early age compressive strength of different strength levels fly ash concrete is measured. According to the compressive strength of concrete at early age of the two main factors: temperature and age, the calculation model of compressive strength of fly ash concrete is established and analyze the model parameters with introduction of equivalent age theory. The compressive strength of fly ash concrete structures is predicted by measuring temperature field with computational models. The results show that the compressive strength of fly ash concrete calculation model can accurately calculate the compressive strength of fly ash concrete structures, which can effectively guide the engineering application of fly ash concrete.