硅酸盐通报2025，Vol.44Issue(9)：3207-3217,11.DOI:10.16552/j.cnki.issn1001-1625.2025.0173
大风干热环境中风积沙PVA-FRCC板早期收缩开裂性能
Early Shrinkage Cracking Performance of Aeolian Sand PVA-FRCC Plate in Windy and Hot-Dry Environment
摘要
Abstract
To explore the early-age(7 d)restrained shrinkage and cracking performance of polyvinyl alcohol fiber reinforced cementitious composite(PVA-FRCC)plate containing aeolian sand under windy and dry-hot environment in western China,and to promote the engineering application of aeolian sand,thereby reducing the exploitation of natural aggregates,this study was carried out.In this study,the early shrinkage performance of PVA-FRCC plate was studied by taking the aeolian sand replacement rate,fiber volume fraction,water-binder ratio and restrained degree as variables,and the shrinkage estimation model was established.The results show that the restrained shrinkage increases with the increase of aeolian sand replacement rate and water-binder ratio.The incorporation of PVA fiber can not only reduce the restrained shrinkage,but also significantly improve the crack resistance of aeolian sand PVA-FRCC plate.When the aeolian sand replacement rate is higher and the water-binder ratio is slightly larger,the crack resistance grade of aeolian sand PVA-FRCC plate is the highest.From the comprehensive performance of shrinkage performance,mechanical performance,aeolian sand utilization rate and economy,it is better to mix a certain amount of PVA fiber,moderate aeolian sand replacement rate and small water-binder ratio.The internal humidity change of aeolian sand PVA-FRCC plate is divided into three stages,which is highly correlated with the shrinkage change law,reflecting the shrinkage change mechanism.Through theoretical analysis,the early restrained shrinkage estimation model of aeolian sand PVA-FRCC plate is established.The calculated value of the model is in good agreement with the experimental value,which can provide reference for the early shrinkage estimation and crack control of aeolian sand PVA-FRCC plate.关键词
风积沙/PVA-FRCC板/约束收缩/干热/湿度/阻裂等级/收缩估算模型Key words
aeolian sand/PVA-FRCC plate/restrained shrinkage/hot-dry/humidity/crack resistance grade/shrinkage estimation model分类
建筑与水利引用本文复制引用
王玉清,薛延昭,云泽亚,孙华钧,刘曙光..大风干热环境中风积沙PVA-FRCC板早期收缩开裂性能[J].硅酸盐通报,2025,44(9):3207-3217,11.基金项目
内蒙古自治区自然科学基金(2023LHMS05016) （2023LHMS05016）
国家自然科学基金(52468039,51968056) （52468039,51968056）
内蒙古自治区科技计划(2022YFHH0153) （2022YFHH0153）
内蒙古自治区直属高校基本科研业务费项目(JY20240076) （JY20240076）
