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寇佳亮^1,2，鄧明科¹，梁興文¹

（1 西安建筑科技大學(xué)土木工程學(xué)院，西安 710055；2 西安理工大學(xué)土木建筑工程學(xué)院, 西安 710048）

 

［摘要］選用5種不同的PVA纖維配制延性纖維增強(qiáng)混凝土，對(duì)其進(jìn)行單軸拉伸性能試驗(yàn)，測得材料的立方體抗壓強(qiáng)度、密度和拉伸應(yīng)力-應(yīng)變?nèi)€。通過試驗(yàn)對(duì)比分析發(fā)現(xiàn)，摻加不同PVA纖維的延性纖維增強(qiáng)混凝土的拉伸應(yīng)力-應(yīng)變曲線均具有一定的應(yīng)變硬化特性；不同PVA纖維性能對(duì)初裂應(yīng)力-應(yīng)變、峰值應(yīng)力-應(yīng)變、極限拉應(yīng)變和抗壓強(qiáng)度都有明顯的影響；同一種纖維配制的延性纖維增強(qiáng)混凝土隨著水膠比增大，其立方體抗壓強(qiáng)度均有明顯降低，并且密度降低；水膠比對(duì)延性纖維增強(qiáng)混凝土的立方體抗壓強(qiáng)度、應(yīng)力-應(yīng)變影響較大，在滿足抗拉強(qiáng)度和韌性的前提下應(yīng)采用較低的水膠比，這也有助于提高纖維的分散性，但同時(shí)較低的水膠比將使其和易性變差。

［關(guān)鍵詞］延性纖維增強(qiáng)混凝土；聚乙烯醇纖維；單軸拉伸性能；應(yīng)力-應(yīng)變曲線；應(yīng)變硬化

中圖分類號(hào)：TU528.58        文獻(xiàn)標(biāo)識(shí)碼：A        文章編號(hào)：1002-848X(2013)01-0059-06

 

Kou Jialiang^1,2, Deng Mingke¹, Liang Xingwen¹

(1 School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China; 2 School of Civil Engineering & Architecture, Xi′an University of Technology, Xi′an 710048, China)

 

Abstract: The uniaxial tensile properties of ductile fiber reinforced concrete compounded with 5 various PVA fibers were tested. The cube compressive strength,density and the uniaxial tensile complete stress-strain curve were obtained. Tests of uniaxial tensile properties show that the curves of partial ductile fiber reinforced concrete have strainhardening properties. Various PVA fibers properties have significant influence on initial cracking stress-strain, peak stress-strain, ultimate tensile strain and cube compressive strength. When the water-cement ratio of ductile fiber reinforced concrete with the same fiber increases, the cube compressive strength and density decrease. The water-cement ratio of ductile fiber reinforced concrete also has great effect on the stress-strain and cube compressive strength. The lower water-cement ratio, if the good tensile strength and toughness can be met, can help to improve the dispersion of fibers, and make it worse workability.

Keywords: ductile fiber reinforced concrete; PVA fiber; uniaxial tensile property; stress-strain curve; strain-hardening

* 國家自然科學(xué)基金資助項(xiàng)目(50908187,51078305)，陜西省重點(diǎn)學(xué)科建設(shè)專項(xiàng)資金資助項(xiàng)目(E01001，E01003)，陜西省自然科學(xué)青年基金資助項(xiàng)目（2009JQ7013），西安建筑科技大學(xué)基礎(chǔ)研究基金資助項(xiàng)目（JC0902）, 長江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃資助項(xiàng)目，西安理工大學(xué)博士啟動(dòng)資金（118\|211206)。

作者簡介：寇佳亮，博士，講師，Email：jialiangkou0918@163.com

 

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