交流电场养护对水泥浆体性能的影响  

Effect of alternating current electric field curing on properties of cement paste

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;Power China Zhongnan Engineering Corporation Limited,Changsha 410007,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中国电建集团中南勘测设计研究院有限公司,湖南长沙410007

出　　处：《混凝土》2024年第7期33-38,共6页Concrete

基　　金：国家自然科学基金面上项目“交流电场对自密实混凝土初始结构构筑行为的影响及调控”(52178261)。

摘　　要：交流电场养护是一种绿色、可智能调控水泥基材料温度的快速养护方式。为研究交流电场对水泥浆体性能的影响,测试了水泥净浆试件在养护电压、试件长度、截面面积和水灰比4个影响因素作用下的温度变化,并测试了不同峰值温度条件下试件的力学性能。通过MIP测试的试件微观孔隙结构分析了峰值温度对孔隙结构的影响,讨论了交流电场能耗和电功率对峰值温度的影响。结果表明:交流电场的施加提高了水泥浆体的峰值温度和升温速率。各因素对试件峰值温度的影响由大到小依次是电压、试件长度、试件截面面积、试件水灰比。试件的抗压强度随着峰值温度的增加先上升后下降。这可能是由于试件峰值温度的提升会加速水泥的水化和产物的形成,密实了样品的孔结构,进而提升试件早期力学性能。但过高的温度也会导致试件产生热伤损,不利于微结构与性能的发展。此外,发现单位体积能耗和电功率与试件峰值温度成线性关系。Alternating current electric field curing(AC)is a rapid,green curing method that allows for intelligent temperature management of cement-based products.This research investigates the temperature fluctuation of cement paste specimens under the influence of four parameters,such as curing voltage,specimen length,cross-sectional area,water-cement ratio,and evaluates the mechanical characteristics of specimens with different peak temperatures in order to study the impact of AC on the properties of cement paste.Finally,the microscopic pore structure of the samples examined by MIP as well as the amount of energy consumed and electrical power per unit volume produced by the AC are discussed.The results demonstrate that the application of AC raises the peak temperature of the cement paste,while voltage,specimen cross-sectional area,specimen length and specimen water-cement ratio being the main parameters influencing the peak temperature of the specimens,in that order.The specimens'compressive strength appears to rise and then fall as peak temperature rises,which is supported by the MIP data.Since the hydration of the cement is accelerated by a rise in peak temperature,this leads to denser pore structures in the samples,which improve the specimens'early mechanical properties.However,high temperatures can also cause thermal damage to the samples,which impairs pore structures development.The peak temperature of the specimen can be raised by increasing the amount of energy and electrical power per unit volume of the specimen and by increasing the specific surface area of the mold.

关 键 词：交流电场养护 水泥浆体 温度 极差分析 孔结构 

分 类 号：TU528.064[建筑科学—建筑技术科学]