- 楊 珊1,李 祚1,彭林欣1,2,羅月靜3,4,滕曉丹1,2,5
2021年第4期
摘要
引用本文
摘 ? 要:對經過100 ℃、200 ℃、400 ℃、600 ℃高溫處理后的聚乙烯醇纖維增強水泥基復合材料(PVA-ECC)進行了單軸壓縮試驗、單軸拉伸試驗、剪切試驗和四點彎曲試驗,對不同溫度下的試驗結果進行了對比分析,擬合了高溫后PVA-ECC各項性能的退化曲線,并通過掃描電鏡觀察了微觀結構。結果表明:PVA-ECC在常溫下能夠表現出良好的變形能力;當溫度由常溫升至100 ℃時,抗壓強度大幅下降,繼續升至200 ℃時則有一定提高;當溫度超過200 ℃以后,抗壓強度、抗拉強度和極限拉應變均降低,試件由延性破壞變為脆性破壞;常溫下,PVA-ECC試件表面密實完整,經過400 ℃高溫處理后,試件呈現出稀疏多孔結構,溫度超過600 ℃時,試件表面呈片狀、海綿狀形態。
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.
楊珊,李祚,彭林欣,等.高溫后PVA纖維增強水泥基復合材料力學性能試驗研究[J].混凝土與水泥制品,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.