杨 珊1,李 祚1,彭林欣1,2,罗月静3,4,滕晓丹1,2,5
杨珊,李祚,彭林欣,等.高温后PVA纤维增强水泥基复合材料力学性能试验研究[J].混凝土与水泥制品,2021(4):49-54.
YANG S,LI Z,PENG L X,et al.Study on Mechanical Properties of PVA-ECC Composites After Elevated Temperature[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):49-54.
高温后PVA纤维增强水泥基复合材料力学性能试验研究
杨 珊1,李 祚1,彭林欣1,2,罗月静3,4,滕晓丹1,2,5
杨珊,李祚,彭林欣,等.高温后PVA纤维增强水泥基复合材料力学性能试验研究[J].混凝土与水泥制品,2021(4):49-54.
YANG S,LI Z,PENG L X,et al.Study on Mechanical Properties of PVA-ECC Composites After Elevated Temperature[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):49-54.
摘 要:对经过100 ℃、200 ℃、400 ℃、600 ℃高温处理后的聚乙烯醇纤维增强水泥基复合材料(PVA-ECC)进行了单轴压缩试验、单轴拉伸试验、剪切试验和四点弯曲试验,对不同温度下的试验结果进行了对比分析,拟合了高温后PVA-ECC各项性能的退化曲线,并通过扫描电镜观察了微观结构。结果表明:PVA-ECC在常温下能够表现出良好的变形能力;当温度由常温升至100 ℃时,抗压强度大幅下降,继续升至200 ℃时则有一定提高;当温度超过200 ℃以后,抗压强度、抗拉强度和极限拉应变均降低,试件由延性破坏变为脆性破坏;常温下,PVA-ECC试件表面密实完整,经过400 ℃高温处理后,试件呈现出稀疏多孔结构,温度超过600 ℃时,试件表面呈片状、海绵状形态。
Abstract: Uniaxial compression, uniaxial tensile, shearing and four-point bending tests were carried out on polyvinyl alcohol fiber reinforced cement-based composite materials (PVA-ECC) after high temperature treatment at 100 ℃, 200 ℃, 400 ℃ and 600 ℃. The test results at different temperatures were compared and analyzed, the degradation curves of various properties of PVA-ECC after high temperature were deduced, and the microstructure was observed by scanning electron microscope. The results show that PVA-ECC has good deformation capacity at room temperature. When the temperature rises from room temperature to 100 ℃, the compressive strength decreases greatly, and then increases to a certain extent when it continues to rise to 200 ℃. When the temperature exceeds 200 ℃, the compressive strength, tensile strength and ultimate tensile strain of PVA-ECC are reduced, and the specimen changes from ductile failure to brittle failure. At room temperature, the surface of PVA-ECC is dense and complete. After being treated at 400 ℃, the specimen exhibits a sparse porous structure. When the temperature exceeds 600 °C, the surface of the specimen becomes flake and sponge.
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