中南大学学报（自然科学版）2026，Vol.57Issue(7)：3192-3201,10.DOI:10.11817/j.issn.1672-7207.2026.07.024
复合盐侵蚀作用下纳米氮化硼对PVA纤维混凝土力学及抗冻性能的影响
Effect of nano-boron nitride on mechanical and frost resistance properties of PVA fiber concrete under combined salt attack
摘要
Abstract
The effects of nano-boron nitride(BN)on the compressive strength,tensile strength,and frost resistance of PVA fiber concrete under combined salt attack were studied using compressive,splitting tensile,and freeze-thaw tests after simulated combined salt attack.Scanning electron microscopy(SEM)was used to analyze the modification mechanism of BN on PVA fiber concrete.The results show that incorporating BN enhances the mechanical and frost resistance properties of PVA fiber concrete under combined salt attack.After 120 d of salt erosion,the maximum reductions in compressive and splitting tensile strength of specimens without BN are 13.7%and 14.1%respectively;with BN,the reductions are 8.1%and 7.3%respectively.After 150 freeze-thaw cycles,specimens with BN show a decreased mass loss rate(as low as 2.3%)and a reduced decline rate in relative dynamic elastic modulus,indicating enhanced salt-freeze resistance.BN's bridging,pull-out,pinning,and nucleation effects fill pores,promote hydration,densify the matrix,and restrict microcrack initiation and propagation,thereby improving the mechanical and frost resistance properties of PVA fiber concrete.关键词
PVA纤维混凝土/纳米氮化硼/复合盐侵蚀/力学性能/抗盐冻性能/微观结构Key words
PVA fiber concrete/nano-BN/combined salt attack/mechanical properties/salt freeze resistance/microstructure分类
建筑与水利引用本文复制引用
康玉梅,黄蔚,李睿,许畅..复合盐侵蚀作用下纳米氮化硼对PVA纤维混凝土力学及抗冻性能的影响[J].中南大学学报（自然科学版）,2026,57(7):3192-3201,10.基金项目
国家自然科学基金资助项目(U1602232)(Project(U1602232)supported by the National Natural Science Foundation of China) （U1602232）
