周晓媛,彭玉林
ZHOU Xiao-yuan,PENG Yu-lin

• 1:云南农业大学水利学院

摘要(Abstract)：

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 cement-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 average ultimate tensile strain of PVA-ECC is 0.014%, 0.40%, 1.26% and 3.15%, respectively, and the maximum 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 improvement effect. The tensile stress is increased by 54%～77%.

关键词(KeyWords)： PVA-ECC;超高韧性;应变硬化;多缝开裂;极限拉应变
PVA-ECC;ultra high toughness;strain hardening;multiple cracks;ultimate tensile strain

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 周晓媛,彭玉林
ZHOU Xiao-yuan,PENG Yu-lin

DOI: 10.16090/j.cnki.hcxw.2023.05.020

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