PE/PVA纤维海砂ECC的拉伸性能与本构模型
作者:
作者单位:

1.广西大学 土木建筑工程学院,广西 南宁 530004;2.华蓝设计(集团)有限公司,广西 南宁 530011;3.广西交科集团有限公司,广西 南宁 530007;4.广西大学 广西防灾减灾与 工程安全重点实验室,广西 南宁 530004;5.广西大学 工程防灾与结构安全教育部重点实验室, 广西 南宁 530004;6.广西新发展交通集团有限公司,广西 南宁 530028

作者简介:

姚淇耀(1996—),男,广西钦州人,广西大学硕士生. E-mail:503527379@qq.com

通讯作者:

滕晓丹(1984—),女,广西南宁人,广西大学讲师,硕士生导师,博士.E-mail:xdteng@gxu.edu.cn

中图分类号:

TU528.58

基金项目:

国家自然科学基金资助项目 (11962001);中国博士后科学基金资助项目 (2018M633298);广西科技计划项目 (桂科AB17292032);广西自然科学基金资助项目(2018GXNSFBA138060)


Tensile Properties and Constitutive Model of PE/PVA Fiber Sea Sand ECC
Author:
Affiliation:

1.School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;2.Hualan Design & Consulting Group, Nanning 530011, China;3.Guangxi Transportation Science & Technology Group Co., Ltd., Nanning 530007, China;4.Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China;5.Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China;6.Guangxi Xinfazhan Communications Group Co., Ltd., Nanning 530028, China

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    摘要:

    以纤维类型及其体积分数为变量,通过单轴拉伸试验,研究了海砂工程水泥基复合材料(SECC)的单轴拉伸性能,并基于现有工程水泥基复合材料(ECC)的拉伸本构模型,阐述了SECC的稳态开裂机理,提出以强化段与软化段描述SECC拉伸应力-应变关系的波动上升段和下降段,得到了新的适用于SECC的拉伸本构模型.结果表明:纤维体积分数为1.5%的聚乙烯(PE)纤维/SECC表现出饱和多缝开裂的应变硬化行为,其延性可达到3.99%;提出的SECC拉伸本构模型计算结果可准确描述具有稳态开裂行为SECC的拉伸应力-应变关系.

    Abstract:

    Taking the fiber type and its volume fraction as variables, the uniaxial tensile properties of sea sand engineered cementitious composites(SECC) were studied through uniaxial tensile test. Based on the existing tensile constitutive model of engineered cementitious composites(ECC), the steady-state cracking mechanism of SECC was expounded. The fluctuating rising and falling segments of the tensile stress-strain curves of SECC were attributed to the strengthening and softening, and a new tensile constitutive model suitable for SECC was obtained. The results show that polyethlene (PE) fiber/SECC with 1.5% fiber volume fraction exhibits the strain hardening behavior of saturated multi-crack, and the ductility can reach 3.99%. The proposed SECC tensile constitutive model can accurately describe the tensile stress-strain relationship of SECC with steady cracking behavior.

    表 5 强化系数k和衰减系数α的取值Table 5 Values of strengthening coefficient k and attenuation coefficient α
    图1 粉煤灰、偏高岭土和硅砂的粒度曲线Fig.1 Particle size distributions of fly ash, metakaolin and silica sand
    图2 单轴拉伸试验试件示意图Fig.2 Schematic diagram of uniaxial tensile test specimens (size: mm)
    图3 SECC的拉伸应力-应变曲线Fig.3 Tensile stress-strain curves of SECC
    图4 SECC破坏形式Fig.4 Failure modes SECC
    图5 SECC拉伸断面的SEM图Fig.5 SEM images of tensile section of PE/SECC specimens
    图6 ECC的双线模型及其在1.5PE/SECC中的应用Fig.6 Bilinear models of ECC and its application in 1.5PE/SECC
    图7 SECC受拉应力-应变曲线简化模型Fig.7 Simplified tensile stress-strain curve of SECC
    图8 SECC拉伸本构模型模拟结果与试验曲线对比Fig.8 Comparison between modified results from tensile constitutive model and test curves of SECC
    表 4 SECC的单轴拉伸试验结果Table 4 Results of uniaxial tensile test of SECC
    表 6 SECC试验值与计算值对比Table 6 Comparison between test values and calculated values of SECC
    表 3 SECC中的纤维体积分数、28 d抗压强度和流动度Table 3 Fiber volume fraction, compressive strength at 28 d and fluidity of SECC
    表 1 水泥、粉煤灰和偏高岭土的化学组成Table 1 Chemical compositions of cement, fly ash and metakaolin
    表 2 PE、PVA纤维的物理和力学性能Table 2 Physical and mechanical properties of PE and PVA fiber
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姚淇耀,陆宸宇,罗月静,谢政专,滕晓丹.PE/PVA纤维海砂ECC的拉伸性能与本构模型[J].建筑材料学报,2022,25(9):976-983

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  • 收稿日期:2021-07-16
  • 最后修改日期:2021-09-29
  • 在线发布日期: 2022-09-30
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