PVA纤维/超高韧性水泥基复合材料的性能研究  

Study on Properties of PVA Fiber/Ultra-High Toughness Cement-Based Composites

作　　者：周晓媛 彭玉林 ZHOU Xiao-yuan;PENG Yu-lin(College of Water Resource and Hydraulic Power Architecture,Yunnan Agricultural University,Kunming 650051,Yunnan,China)

机构地区：[1]云南农业大学水利学院,云南昆明650051

出　　处：《合成纤维》2023年第5期94-98,共5页Synthetic Fiber in China

摘　　要：为了提高材料的韧性和耐久性,针对以聚乙烯醇(PVA)纤维为增强材料的超高韧性水泥基复合材料(ECC),研究了不同PVA纤维体积分数对PVA-ECC的极限应变、力学强度等性能的影响。研究表明,PVA纤维体积分数为0、1.0%、1.5%、2.0%时,PVA-ECC的极限拉应变平均值分别为0.014%、0.40%、1.26%和3.15%,最高可达4.73%。PVA纤维体积分数为2.0%条件下,PVA-ECC能够完全实现多点开裂,在拉伸荷载条件下出现大量的细微裂缝,表现出典型的应变硬化特性,极限拉应变基本超过3.0%。相较不掺PVA纤维的基准试件,PVA纤维体积分数为1.0%、1.5%、2.0%时,PVA-ECC试件的抗折强度分别提高了181%、198%和249%,提升效果显著;拉伸应力提高了54%~77%。In order to improve the toughness and durability of materials,for the ultra-high toughness ce⁃ment-based composites(ECC)reinforced by polyvinyl alcohol(PVA)fibers,the effects of different volume fractions of PVA fibers on the ultimate strain,mechanical strength and other properties of PVA-ECC were studied.The results show that when the volume fraction of PVA fiber is 0,1.0%,1.5%and 2.0%,the aver⁃age ultimate tensile strain of PVA-ECC is 0.014%,0.40%,1.26%and 3.15%,respectively,and the maxi⁃mum is 4.73%.When the volume fraction of PVA fiber is 2.0%,PVA-ECC can fully realize multi-point cracking,and a large number of fine cracks appear under tensile load,showing typical strain hardening characteristics,and the ultimate tensile strain is more than 3.0%.Compared with the reference specimen without PVA fiber,when the volume fraction of PVA fiber is 1.0%,1.5%and 2.0%,the flexural strength of the PVA-ECC specimen is increased by 181%,198%and 249%,respectively,showing a significant im⁃provement effect.The tensile stress is increased by 54%~77%.

关 键 词：PVA-ECC 超高韧性 应变硬化 多缝开裂 极限拉应变 

分 类 号：TQ342.41[化学工程—化纤工业] TU528.58[建筑科学—建筑技术科学]