低纤维掺量超高延性混凝土的拉伸性能研究-《混凝土与水泥制品》杂志社

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低纤维掺量超高延性混凝土的拉伸性能研究

Study on tensile properties of ultra-high ductility concrete with low content fiber

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关键词：

超高延性混凝土（UHDC）；聚乙烯（PE）纤维；应力-应变曲线；应变硬化；多缝开裂

Key words：

Ultra-high ductility concrete(UHDC); Polyethylene(PE) fiber; Stress-strain curve; Strain hardening; Multiple cracking

刊期：

2025年第5期

DOI：

10.19761/j.1000-4637.2025.05.053.05

文章编号：

基金项目：

国家自然科学基金项目（52308272）；河北省自然科学基金项目（E2022210005）；河北省教育厅青年拔尖人才项目（BJK2024020）；石家庄铁道大学研究生创新资助项目（YC202410）。

作者：

张媛，曹泽召，王义超*，吴平飞，管忠正

单位：

道路与铁道工程安全保障省部共建教育部重点实验室石家庄铁道大学，河北石家庄，050043

摘要

摘要：为探索采用低掺量纤维制备超高延性混凝土（UHDC）的可行性，研究了不同长度（18、24、36 mm）的聚乙烯（PE）纤维对UHDC裂缝分布形式、拉伸应力-应变曲线、拉伸性能指标的影响。结果表明：掺不同长度PE纤维UHDC试件的裂缝宽度均小于0.20 mm，表现出显著的应变硬化和多缝开裂特征；随着PE纤维长度的增加，UHDC试件的峰值应力、极限拉伸应变、应变能均呈先增后减的趋势，初裂应力呈降低趋势；当PE纤维长度为24 mm时，UHDC试件的峰值应力、极限拉伸应变、应变能相对最优，分别为6.58 MPa、5.44%、234.53 kJ/m³。

Abstract: In order to explore the feasibility of preparing ultra-high ductile concrete(UHDC) with low content fiber, the effects of polyethylene(PE) fiber with different lengths(18, 24, 36 mm) on the crack distribution form, tensile stress-strain curve, and tensile properties indicators of UHDC were investigated. The results show that, the crack widths of UHDC specimens mixed with different lengths of PE fiber are less than 0.20 mm, and the UHDC specimens show significant strain hardening and multiple cracking characteristics. With the increase of the length of PE fiber, the peak stress, ultimate tensile strain, and strain energy of UHDC specimens show a tendency of first increasing and then decreasing, and the initial cracking stress shows a tendency of decreasing. When the length of PE fiber is 24 mm, the peak stress, ultimate tensile strain and strain energy of UHDC specimens are relatively optimal, which are 6.58 MPa, 5.44% and 234.53 kJ/m³, respectively.

结论

（1）随着PE纤维长度的增加，UHDC试件的裂缝数量基本呈增大趋势，裂缝宽度和裂缝间距基本呈减小趋势；掺不同长度PE纤维UHDC试件的裂缝宽度均小于0.20 mm，表明UHDC试件具有优异的裂缝控制能力。
（2）掺不同长度PE纤维的UHDC试件均表现出显著的应变硬化和多缝开裂特征，其中，当PE纤维长度为24 mm 时，UHDC试件的抗拉强度和抗拉延性相对最优。
（3）随着PE纤维长度的增加，UHDC试件的峰值应力、极限拉伸应变和应变能均呈先增后减的趋势，初裂应力呈降低趋势，当PE纤维长度为24 mm时，UHDC试件的极限拉伸应变、峰值应力和应变能相对最优，分别为5.44%、6.58 MPa和234.53 kJ/m³。

参考文献

[1] 杨嘉震.钢纤维增强混凝土简介[J].混凝土及建筑构件,1980(4):56-60.
[2] ZHANG D,YU J,WU H L,et al.Discontinuous micro-fibers as intrinsic reinforcement for ductile engineered cementitious composites(ECC)[J].Composites Part B:Engineering,2020,184:107741.
[3] 安蕊梅,段树金.低体积含量的钢纤维混凝土三折线拉应变软化曲线的确定[J].石家庄铁道大学学报(自然科学版),2017,30(1):14-18.
[4] LI V C,LEUNG C K Y.Steady-state and multiple cracking of short random fiber composites[J].Journal of Engineering Mechanics,1992,118(11):2246-2264.
[5] 徐世烺,李贺东.超高韧性水泥基复合材料研究进展及其工程应用[J].土木工程学报,2008(6):45-60.
[6] ZHANG J,LI V C.Monotonic and fatigue performance in bending of fiber-reinforced engineered cementitious composite in overlay system[J].Cement and Concrete Research,2002,32(3):415-423.
[7] YU K,WANG Y,YU J,et al.A strain-hardening cementitious composites with the tensile capacity up to 8%[J].Construction and Building Materials,2017,137:410-419.
[8] 王义超,侯梦君,余江滔,等.聚乙烯纤维制备超高延性水泥基复合材料的试验研究[J].材料导报,2018,31(20):3535-3540.
[9] 李贺东.超高韧性水泥基复合材料试验研究[D].大连:大连理工大学,2009.
[10] 孔燕,邵永健,杜亮,等.ECC的材料组成与性能关系分析[J].硅酸盐通报,2020,39(1):68-74.
[11] YU K Q,LU Z D,DAI J G,et al.Direct tensile properties and stress-strain model of UHP-ECC[J].Journal of Materials in Civil Engineering,2020,32(1):04019334.
[12] WANG Y,LIU F,YU J,et al.Effect of polyethylene fiber content on physical and mechanical properties of engineered cementitious composites[J].Construction and Building Materials,2020,251:118917.
[13] LEI D,GUO L,CHEN B,et al.The connection between microscopic and macroscopic properties of ultra-high strength and ultra-high ductility cementitious composites(UHS-UHDCC)[J].Composites,2019,164:144-157.
[14] 中华人民共和国工业和信息化部.高延性纤维增强水泥基复合材料力学性能试验方法:JC/T 2461—2018[S].北京:中国建材工业出版社,2018.
[15] YU J,LU C,CHEN Y,et al.Experimental determination of crack-bridging constitutive relations of hybrid-fiber strain-hardening cementitious composites using digital image processing[J].Construction Building Materials,2018,173:359-367.
[16] 王振波,张君,王庆.混杂纤维增强延性水泥基复合材料力学性能与裂宽控制[J].建筑材料学报,2018,21(2):216-221.
[17] 中华人民共和国住房和城乡建设部.地下工程防水技术规范:GB 50108—2008[S].北京:中国计划出版社,2008.
[18] RANADE R,LI V C,STULT M D,et al.Micromechanics of high-strength, high-ductility concrete[J].ACI Materials Journal,2013,110(4):375-384.
[19] KANDA T,LIN Z,LI V C.Tensile stress-strain modeling of pseudo-strain hardening cementitious composites[J].Journal of Materials in Civil Engineering,2000,12(2):147-156.
[20] WANG S J,LI Y,WANG YF,et al.Structures and nonlinear optical properties of the endohedral metallofullerene-superhalogen compounds Li@ C60-BX4 (X=F,Cl,Br)[J].Physical Chemistry Chemical Physics,2013,15(31):12903.
[21] LU C,LI V C,LEUNG C K Y.Flaw characterization and correlation with cracking strength in Engineered Cementitious Composites(ECC)[J].Cement Concrete Research,2018,107:64-74.

引用本文

张媛,曹泽召,王义超,等.低纤维掺量超高延性混凝土的拉伸性能研究[J].混凝土与水泥制品,2025(5):53-57.

ZHANG Y,CAO Z Z,WANG Y C,et al.Study on tensile properties of ultra-high ductility concrete with low content fiber[J].China Concrete and Cement Products,2025(5):53-57.

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