负温环境下电养护对砂浆成型温度及早期强度的影响  

Effect of electric curing on mortar forming temperature and early strength under negative temperature environment

作　　者：杨州州 毛江鸿 李碧雄[1] 钱伟 李莉斯[3] YANG Zhouzhou;MAO Jianghong;LI Bixiong;QIAN Wei;LI Lisi(College of Architecture and Environment,Sichuan University,Chengdu 610065,P.R.China;Xizang Zangjian Technology Co.,Ltd,Lhasa 851400,P.R.China;College of Engineering,Xizang University,Lhasa 851400,P.R.China)

机构地区：[1]四川大学建筑与环境学院,成都610065 [2]西藏藏建科技股份有限公司,拉萨851400 [3]西藏大学工学院,拉萨851400

出　　处：《土木与环境工程学报(中英文)》2025年第2期191-196,共6页Journal of Civil and Environmental Engineering

基　　金：四川省重点研发项目(2022YFQ0048)。

摘　　要：为了研究负温环境下电养护对掺甲酸钙早强剂砂浆早期强度发展的影响,在砂浆中添加甲酸钙早强剂,掺量为胶凝材料的2%质量分数,并在-10℃环境下通交流电进行电养护。试验过程中,通过温度仪监测不同通电参数下砂浆内部温度的实时变化,测试不同通电参数下砂浆通电1 d的强度以及后续标准养护3、7 d的强度。结果表明:电养护可以有效预防新拌砂浆在-10℃环境下产生受冻损伤并加速砂浆固化成型;掺甲酸钙砂浆试件初始电阻仅为未掺甲酸钙砂浆的1/4,说明掺甲酸钙能有效降低砂浆电阻,从而提高通电效率;掺甲酸钙砂浆的3、7 d强度较相同通电参数下未掺甲酸钙砂浆分别提高了59%、29%,说明甲酸钙在电养护1 d后同样具有明显的早强作用,可以快速促进砂浆早期强度发展。In order to study the effect of electric curing on the early strength development of mortar mixed with calcium formate early strength agent under a negative temperature environment,calcium formate early strength agent with 2%mass of cementitious material was mixed into the mortar,and electric curing was carried out by passing alternating current in a-10°C environment.During the test,the real-time changes of the internal temperature of the mortar under different energization parameters were monitored by a thermometer,and finally,the strength of the mortar energized for one day and the strength of the subsequent standard curing for 3 days and 7 days under different energization parameters were tested.The test results show that the addition of calcium formate to the mortar can effectively reduce the resistance and thus improve the energizing efficiency,and the initial resistance of the mortar specimens with calcium formate is 1/4 that of the mortar without calcium formate,so that it can achieve a good heating effect at a lower applied voltage.Calcium formate also has an obvious early strength effect after 1 day of electrical curing,which can promote the early strength development of the mortar.The strengths at 3 days and 7 days of the calcium formate-doped mortar increased by 59%and 29%,respectively,compared with the un-doped calcium formate mortar under the same energizing parameters.

关 键 词：砂浆 电养护 早强剂 早期强度 寒冷地区 

分 类 号：TU525.9[建筑科学—建筑技术科学]