直接电养护对混凝土力学性能的影响  

Effect of Direct Electric Curing on the Mechanical Properties of Concrete

作　　者：杨智涵 贺炯煌 谢友均[1] 龙广成[1] 王凡 YANG Zhihan;HE Jionghuang;XIE Youjun;LONG Guangcheng;WANG Fan(School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《混凝土与水泥制品》2023年第6期6-10,共5页China Concrete and Cement Products

基　　金：国家自然科学基金面上项目(52178261);国家自然科学基金重大项目(11790283)。

摘　　要：为研究直接电养护(DEC)对混凝土力学性能的影响,采用交流电场,进行了不同养护电压对纯水泥混凝土和粉煤灰混凝土抗压强度、内部温度以及内部电流的影响试验研究。结果表明:各组混凝土的早期抗压强度基本随养护电压的增大而增加,而后期抗压强度则基本相反;20 V电压下DEC纯水泥混凝土和粉煤灰混凝土内部峰值温度分别达到69.4℃、60.3℃,1 d抗压强度显著提升,相较于标养组分别提高了22.8%、37.0%;掺入粉煤灰提升了混凝土的电阻率,需要更高的电压才能达到等同纯水泥混凝土的养护温度;各组混凝土的内部电流大体呈先增加后降低的趋势,并随养护电压的增大而增加,说明DEC对早期混凝土的加热效率高于后期。In order to study the influence of direct electric curing on the mechanical properties of concrete,the influence of different curing voltages on the compressive strength,internal temperature and internal current of pure cement concrete and fly ash concrete was studied by using AC electric field.The results show that the early compressive strength of each group of concrete basically increases with the increase of curing voltage,while the late compressive strength is basically opposite.Under 20 V voltage,the internal peak temperatures of DEC pure cement concrete and fly ash concrete reach 69.4℃and 60.3℃respectively,and the 1 d compressive strength of DEC pure cement concrete and fly ash concrete are increased by 22.8%and 37.0%respectively compared with the standard curing group.Adding fly ash increases the resistivity of concrete,which requires higher voltage to reach the curing temperature of pure cement concrete.The internal current of each group of concrete generally increases first and then decreases,and increases with the increase of curing voltage,indicating that the heating efficiency of DEC on early concrete is higher than that of late concrete.

关 键 词：直接电养护 热养护 欧姆热 抗压强度 电压 电流 

分 类 号：TU528.45[建筑科学—建筑技术科学]