基于等效龄期的抗冲耐磨混凝土力学性能预测

发布时间：2018-11-20 17:25

【摘要】：等效龄期法主要应用于实际温度历程下混凝土的抗压强度预测,而对抗拉强度和弹性模量等抗裂性参数的预测却鲜有报道。为进一步完善相应的实验方法,验证用等效龄期法参于测定、计算实际温度历程下混凝土力学性能参数的适用性,通过测试抗冲磨混凝土绝热温升,以实际工程为数值计算模型,获得了温度匹配历程曲线;随后以3种活化能有明显区别的抗冲磨混凝土(FA、FAS、EA)为例,采用ASTM C 1074-04方法测定了其砂浆活化能。基于Arrhenius公式计算混凝土在温度匹配养护(TMC)过程中的等效龄期,结合其标准养护(SC)下抗拉强度和弹性模量的经时发展模型,得到实际温度历程下的力学性能计算值,其结果与采用实际温度历程进行温度匹配养护得到的实测结果较为一致。
[Abstract]:The equivalent age method is mainly used to predict the compressive strength of concrete under the actual temperature history, but the prediction of crack resistance parameters such as tensile strength and elastic modulus is seldom reported. In order to further improve the corresponding experimental methods, verify the applicability of the equivalent age method to the measurement, calculate the mechanical properties parameters of concrete under the actual temperature history, and test the adiabatic temperature rise of the anti-impact concrete, Taking the actual engineering as the numerical model, the temperature matching history curve is obtained. The activation energy of mortar was measured by ASTM C1074-04 method, taking three kinds of concrete (FA,FAS,EA) with different activation energy as an example. Based on the Arrhenius formula, the equivalent age of concrete in the process of temperature-matched curing (TMC) is calculated. Combined with the time-varying model of tensile strength and elastic modulus under standard curing (SC), the calculated values of mechanical properties of concrete under actual temperature history are obtained. The results are in good agreement with the measured results obtained by temperature matching curing with actual temperature history.
【作者单位】：江西省水利科学研究院水工安全工程技术研究中心;南京水利科学研究院材料结构研究所;水利部水工新材料工程技术研究中心;
【基金】：中央级公益性科研院所基本科研业务费专项项目(Y415014) 江西省水利厅科技项目(KT201414)
【分类号】：TU528

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