养护制度对轻集料超高性能混凝土力学性能的影响  

Effect of maintenance regime on mechanical properties of LUHPC

作　　者：程书祥 肖元元 冯泽林 马文彬 郭凯正 丁庆军[3] 解鹏洋 CHENG Shuxiang;XIAO Yuanyuan;FENG Zelin;MA Wenbin;GUO Kaizheng;DING Qingjun;XIE Pengyang(Guangdong Gezhouba Zhaoming Expressway Co.Ltd.,Zhaoqing 526070,China;Gezhouba Group Transportation Investment Co.Ltd.,Wuhan 430000,China;State Key Laboratory for Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;China New Building Materials Design and Research Institute Co.Ltd.,Hangzhou 310022,China)

机构地区：[1]广东葛洲坝肇明高速公路有限公司,广东肇庆526070 [2]葛洲坝集团交通投资有限公司,湖北武汉430000 [3]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070 [4]中国新型建材设计研究院有限公司,浙江杭州310022

出　　处：《新型建筑材料》2024年第7期117-121,共5页New Building Materials

基　　金：国家自然科学基金项目(U21A20149)。

摘　　要：研究了标准养护、蒸汽养护、干热养护、蒸压养护等4种养护制度的升温速率、恒温时间、恒温温度等养护参数对轻集料超高性能混凝土(LUHPC)强度的影响,确定了最佳养护制度,并研究了养护制度对LUHPC弯曲韧性的影响。结果表明:高温养护能加快LUHPC的水化速率,提高早期强度,然而过高的养护温度会导致LUHPC力学性能下降;蒸汽养护与标准养护下LUHPC的力学性能无明显差异;蒸压养护与干热养护能够明显提高LUHPC的峰值挠度与峰值荷载,干热养护下LUHPC的残余韧性最高。In this paper,four curing systems including standard curing,steam curing,dry curing and autoclaved curing were adopted in the experiment.The influences of curing parameters such as temperature rise rate,constant temperature time and constant temperature on the strength of lightweight ultra-high performance concrete(LUHPC)were studied.The optimal curing system was determined and the influence of curing system on the bending toughness of LUHPC was studied.The results show that high temperature conditioning can accelerate the hydration rate of LUHPC and improve the early strength,however,too high conditioning temperature will lead to the degradation of mechanical properties of LUHPC.There is no significant difference between the mechanical properties of LUHPC under steam conditioning and standard conditioning.Autoclaved curing and dry heat curing can significantly increase the peak deflection and peak load of LUHPC,and the residual toughness of LUHPC under dry heat curing is the highest.

关 键 词：养护制度 轻集料超高性能混凝土 力学性能 弯曲韧性 

分 类 号：TU528[建筑科学—建筑技术科学]