Bond tensile performance and constitutive models of interfaces between vertical and horizontal filaments of 3D printed concrete

doi:10.3785/j.issn.1008-973X.2021.11.019

Journal of ZheJiang University (Engineering Science)

2021, Vol. 55

Issue (11): 2178-2185 DOI: 10.3785/j.issn.1008-973X.2021.11.019

Bond tensile performance and constitutive models of interfaces between vertical and horizontal filaments of 3D printed concrete

Jing ZHANG(

),Dao-qin ZOU,Hai-long WANG*(

),Xiao-yan SUN

College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

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Abstract

Directly tensile tests were conducted, in order to investigate the tensile properties of the interfaces between vertical and horizontal filaments of 3D printed concrete and the tension-deformation curves. The distribution of porosity in the matrix and the interfaces were obtained and the thicknesses as well as average porosity of the interfaces were determined, using XCT scanning technique. The tensile-deformation curves of the interfaces were obtained, according to the deformation relationship between the interfaces and the matrix. The tensile constitutive models of interfaces were established based on the existing damage constitutive theory. Results showed that the average tensile strengths between vertical and horizontal filaments were 1.636 MPa and 1.514 MPa, accounting for 85.8% and 79.4% of the matrix strength, respectively. An elastic model can be used to describe the relationships of strength, ultimate deformation and porosity of interfaces. The thickness of the interface between vertical filaments was about 0.81 mm, while the thickness of the interface between horizontal filaments was about 2.12 mm. The calculated results based on the established constitutive model agreed well with the test results, which can accurately reflect the mechanical response of 3D printed concrete under tensile stress and provide some scientific support to the numerical simulation of 3D printed concrete.

Key words： 3D printed concrete interface tensile performance tension-deformation curve interface thickness tensile constitutive model

Received: 21 December 2020 Published: 05 November 2021

CLC:

TU 528

Fund: 国家自然科学基金资助项目（52079123）；浙江省重点研发计划资助项目（2021C01022）

Corresponding Authors: Hai-long WANG E-mail: 1092384700@qq.com;hlwang@zju.edu.cn

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Cite this article:

Jing ZHANG,Dao-qin ZOU,Hai-long WANG,Xiao-yan SUN. Bond tensile performance and constitutive models of interfaces between vertical and horizontal filaments of 3D printed concrete. Journal of ZheJiang University (Engineering Science), 2021, 55(11): 2178-2185.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.11.019 OR https://www.zjujournals.com/eng/Y2021/V55/I11/2178

3D打印混凝土层条间界面抗拉性能与本构模型

通过直接拉伸试验，研究3D打印混凝土层、条间界面的抗拉强度与整体拉伸-变形曲线. 通过XCT扫描，根据孔隙率在基体与界面处的分布规律，确定层、条间界面的厚度和平均孔隙率. 根据打印混凝土基体与层、条界面的变形关系得到界面的拉伸-变形曲线. 基于混凝土的拉伸塑性损伤本构理论，建立3D打印混凝土层、条间界面的拉伸本构模型. 研究结果显示：打印混凝土层、条间的平均抗拉强度为1.636、1.514 MPa，分别占基体抗拉强度的85.8%、79.4%；层、条间界面抗拉强度和极限变形与界面处孔隙率存在明显的线性关系；层间界面厚度约为0.81 mm，条间界面厚度约为2.12 mm；所建立的本构模型与试验结果较吻合，能够准确反映拉伸荷载作用下界面的力学响应，可以为3D打印混凝土数值模拟提供可靠依据.

关键词： 3D打印混凝土, 界面拉伸性能, 应力-应变曲线, 界面厚度, 拉伸本构模型

Tab.1 Chemical compositions of cement %

Tab.2 Physical and mechanical properties of PVA fiber

Fig.1 Size and interface between layers of tensile specimen

Fig.2 Tensile test apparatus

Fig.3 Tensile specimen for interfacial tensile test

Fig.4 Schematic diagram of CT scan specimen

Fig.5 Failure modes of specimens in tensile test

Fig.6 Tensile strength of matrix and interfaces

Fig.7 Damaged section of interfaces in tensile test

Fig.8 3D reconstruction model of printed specimen by CT scan

Fig.9 Study area of porosity in matrix part (left view)

Fig.10 Normal fitting results of porosity distribution of matrix parts

Fig.11 Study area of porosity

Fig.12 Porosity distribution of interface between strips

Fig.13 Porosity distribution of interface between layers

Fig.14 Fitting curve of linear relationship between porosity and ultimate tensile strength

Fig.15 Fitting curve of linear relationship between porosity and ultimate tensile strain

Fig.16 Tensile stress-strain curve of interface material

Fig.17 Tensile stress-strain curves of interfaces and matrix

Fig.18 Tensile stress-strain curves of matrix material

Fig.19 Comparison of calculated values and test values of tensile stress-strain curves at interface


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