884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

(湖北工業(yè)大學(xué)土木建筑與環(huán)境學(xué)院， 武漢 430068)

［摘要］主要研究了PVA纖維體積摻量對(duì)纖維增強(qiáng)水泥基復(fù)合材料（PVA-ECC）彎曲韌性的影響，對(duì)PVC纖維體積摻量分別為0%，0.5%，1.0%，1.5%，2.0%的PVA-ECC試件的抗壓強(qiáng)度和方板法彎曲性能等進(jìn)行試驗(yàn)研究，分析了PVA纖維在ECC中的作用機(jī)理，并對(duì)PVA-ECC方板進(jìn)行能量評(píng)價(jià)。結(jié)果表明：PVA纖維體積摻量的改變對(duì)ECC材料的抗壓強(qiáng)度影響甚微，PVA纖維體積摻量的增加對(duì)方板法彎曲韌性試驗(yàn)中ECC試件的初裂荷載影響不大，但峰值荷載有明顯的提高，跨中撓度增加明顯且裂縫寬度減??；PVA-ECC方板彎曲韌性隨PVA纖維體積摻量增大而提高且體積摻量為2.0%時(shí)增韌的效果最佳。

［關(guān)鍵詞］纖維增強(qiáng)水泥基復(fù)合材料； 彎曲韌性； 方板法； 能量評(píng)價(jià)

中圖分類號(hào)：TU528-572文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)13-0044-05

Square plate method experimental study on bending toughness of PVA-ECC

KE Jiao, SU Jun, HU Qiang

(School of Civil and Environmental Engineering, Hubei University of Technology, Wuhan 430068, China)

Abstract:The effect of PVA fiber volume on the bending toughness of Polyvinyl Alcohol Fiber Engineered Cementitious Composite(PVA-ECC) was mainly investigated. Under the volume contents of 0%, 0.5%, 1%, 1.5% and 2%, the compressive strength of PVA-ECC and its bending properties based on square plate method were measured respectively. The mechanism of PVA fiber in ECC was analyzed, and the energy of PVA-ECC square plate was evaluated. The results show that the change of PVA fiber volume fraction has little effect on the compressive strength of ECC material. The increase of PVA fiber volume fraction has little effect on the initial crack load of ECC specimen in the square plate bending toughness test, but the peak load is obviously increased, the mid span deflection is obviously increased and the crack width is reduced. The bending toughness of PVA-ECC square plate increases with the increase of PVA fiber volume fraction and the toughening effect is the best if the volume fraction is 2.0%.

Keywords:Polyvinyl Alcohol Fiber Engineered Cementitious Composite; bending toughness; square plate method; energy evaluation

*國(guó)家自然科學(xué)基金（51579195）。

作者簡(jiǎn)介：柯驕，碩士研究生， Email: 944125324@qq.com。