PVA-钢纤维自密实混凝土早期干燥收缩研究  

Study on early-age drying shrinkage of PVA-steel fiber reinforced self-compacting concrete

作　　者：余建杰[1] 翟嘉欣 郑琪 董建军 YU Jianjie;ZHAI Jiaxin;ZHENG Qi;DONG Jianjun(College of Civil Engineering and Architecture,Nanchang Hangkong University,Nanchang 330063,China;PowerChina Jiangxi Electric Power Construction Co.,Ltd.,Nanchang 330001,China)

机构地区：[1]南昌航空大学土木建筑学院,江西南昌330063 [2]中国电建集团江西省电力建设有限公司,江西南昌330001

出　　处：《混凝土与水泥制品》2024年第6期55-58,63,共5页China Concrete and Cement Products

基　　金：国家自然科学基金项目(51969019)。

摘　　要：研究了钢纤维、PVA纤维、PVA-钢混杂纤维对自密实混凝土早期干燥收缩的影响。结果表明:纤维的掺入不会改变自密实混凝土干燥收缩的发展趋势;单掺钢纤维或PVA纤维均能抑制自密实混凝土的干燥收缩,其中,PVA纤维较钢纤维对自密实混凝土干燥收缩的抑制效果更好,但纤维体积掺量过高则会导致纤维的抑制效果减弱;PVA-钢混杂纤维对自密实混凝土干燥收缩的改善效果优于单一纤维,其中,0.3%体积掺量的钢纤维与0.06%体积掺量的PVA纤维混杂对自密实混凝土干燥收缩的改善效果相对最好,表现出显著的混杂效应。The effects of steel fiber,PVA fiber and PVA-steel hybrid fiber on the early-age drying shrinkage of self-compacting concrete were studied.The results show that the incorporation of fiber will not change the trend of drying shrinkage of self-compacting concrete.The drying shrinkage of self-compacting concrete can be inhibited by mixing steel fiber or PVA fiber.Among which,PVA fiber has a better inhibition effect on the drying shrinkage of self-compacting concrete than that of steel fiber,but the inhibition effect of fiber is weakened by too much fiber volume content.The improved effect of PVA-steel hybrid fiber on drying shrinkage of self-compacting concrete is better than that of single fiber.Among which,mixing 0.3%volume content of steel fiber and 0.06%volume content of PVA fiber shows relatively the best improvement on drying shrinkage of self-compacting concrete,showing a significant hybrid effect.

关 键 词：PVA纤维 钢纤维 混杂纤维 自密实混凝土 干燥收缩 

分 类 号：TU528.572[建筑科学—建筑技术科学]