低热水泥掺量对混凝土绝热温升的影响  

Influence of Low-heat Cement Content on Adiabatic Temperature Rise of Concrete

作　　者：王文富 周选 彭涛 李牧 李春毅 WANG Wenfu;ZHOU Xuan;PENG Tao;LI Mu;LI Chunyi(China State Construction Railway Investment&Engineering Group Co.,Ltd.,Nanchang 330038,China;China Construction Third Engineering Bureau Group Co.,Ltd.,Nanchang 330038,China)

机构地区：[1]中建铁路投资建设集团有限公司,江西南昌330038 [2]中国建筑第三工程局有限公司,江西南昌330038

出　　处：《粉煤灰综合利用》2024年第5期6-10,共5页Fly Ash Comprehensive Utilization

基　　金：国家自然科学基金(51808351);辽宁省应用基础研究计划(2022JH2/101300130)。

摘　　要：随着低热水泥在大体积混凝土中广泛应用,需进一步优化低热混凝土绝热温升性能,降低大体积混凝土的开裂风险。通过调整低热水泥掺量并结合混凝土力学性能和热学试验,研究了3种水泥掺量对混凝土绝热温升及其他热学与力学性能的影响。结果表明:低热水泥掺量对混凝土绝热温升的影响较为显著,与使用水泥掺量为450 kg/m^(3)的混凝土相比,水泥掺量为500 kg/m^(3)的混凝土28 d时最终温度增长23.7%;水泥掺量对低热水泥混凝土热学、力学性能的影响有限,采用高水泥掺量时可获得相对优异的力学性能,相较于水泥掺量为450 kg/m^(3)的混凝土,500 kg/m^(3)时导热系数和线膨胀系数方面有所提升,分别提高10.4%、1.9%,但比热方面略有降低,降幅约为2.3%。As low-heat cement is widely used in mass concrete,it is necessary to further optimize the adiabatic temperature rise performance of low-heat concrete to reduce the risk of cracking in mass concrete.By adjusting the content of low-heat cement and combining concrete mechanical and thermal tests,the study investigated the impact of three cement contents on the adiabatic temperature rise and other thermal and mechanical properties of concrete.The results indicate that the content of low-heat cement has a significant effect on the adiabatic temperature rise of concrete.Compared with concrete with a cement content of 450 kg/m^(3),the final temperature increase of concrete with a cement content of 500 kg/m^(3) at 28 days is 23.7%higher.The impact of cement content on the thermal and mechanical properties of low-heat cement concrete is limited.Using a higher cement content can achieve relatively superior mechanical properties.Compared with concrete with a cement content of 450 kg/m^(3),the thermal conductivity and linear expansion coefficient are improved by 10.4%and 1.9%,respectively,when the cement content is 500 kg/m^(3),but the specific heat capacity is slightly reduced,with a decrease of about 2.3%.

关 键 词：胶凝材料掺量 低热水泥 混凝土 绝热温升 热学性能 

分 类 号：TU528[建筑科学—建筑技术科学]