短期持压载荷对高强混凝土毛细吸水性能的影响  

Influence of Short-Term Sustained Compressive Loading on Capillary Water Absorption of High Strength Concrete

作　　者：王立成[1] 李孟遥 WANG Licheng;LI Mengyao(State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《建筑材料学报》2020年第3期529-536,共8页Journal of Building Materials

基　　金：绿色建筑材料国家重点实验室开放基金资助项目(2018);国家重点基础研究发展计划(973计划)项目(2015CB057703)。

摘　　要：利用改进的实时吸水试验装置,实现了持压载荷和水分传输的同步耦合过程,开展了短期持压荷载下高强混凝土(HSC)毛细吸水试验研究,分析了应力水平对粒化高炉矿渣(GBFS)掺量为0%、10%和20%的C60高强混凝土毛细吸水性能的影响.结果表明:在0%~60%应力水平下,随着应力水平的提高,不同矿渣掺量高强混凝土的累计吸水量和平均吸水率均先减小后增大;短期持压载荷作用下,荷载对混凝土吸水性能的影响主要在初始阶段,GBFS掺量引起混凝土吸水率的变化在后期更显著;C60高强混凝土毛细吸水性能变化的应力水平阈值约为40%,高于C40普通混凝土;随着GBFS掺量的增加,混凝土的吸水率先增大后减小,0%、20%掺量的高强混凝土都能较好地减缓毛细吸水速度.The improved real-time water absorption test device was used to realize the synchronous coupling of loading and water transport process.The capillary water absorption of high strength concrete(HSC)under short-term sustained compressive loading was investigated.The influence of stress level on capillary water absorption property of HSC with granulated blast furnace slag(GBFS)contents of 0%,10%and 20%was analyzed.The results indicate that within 0%-60%stress levels,the accumulative water content and averaged water absorption rate decrease initially and then increase with increasing stress level.under the short-term sustained compressive loading,the influence of load on the water absorption of concrete is mainly in the initial stage,and the change of water absorption caused by the content of GBFS is more significant in the later stage.The stress threshold for variation of capillary absorption property of grade C60 HSC is approximately 40%of its ultimate compressive strength,higher than that of C40.Therefore,HSC can maintain superior durability at a relatively higher loading level.Moreover,with the increase of GBFS content,the water absorption rate of HSC increases first and then decreases.The HSC with 0%and 20%GBFS can slow down the capillary water absorption.

关 键 词：高强混凝土 毛细吸水 持压荷载 粒化高炉矿渣 

分 类 号：TU528[建筑科学—建筑技术科学]