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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (11): 2178-2185    DOI: 10.3785/j.issn.1008-973X.2021.11.019
土木与建筑工程     
3D打印混凝土层条间界面抗拉性能与本构模型
张静(),邹道勤,王海龙*(),孙晓燕
浙江大学 建筑工程学院，浙江 杭州 310058
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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摘要：

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    
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
收稿日期: 2020-12-21 出版日期: 2021-11-05
CLC:  TU 528  
基金资助: 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）
通讯作者: 王海龙     E-mail: 1092384700@qq.com;hlwang@zju.edu.cn
作者简介: 张静（1996—），女，硕士，从事3D打印混凝土研究. orcid.org/0000-0002-0658-126X. E-mail： 1092384700@qq.com
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张静
邹道勤
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孙晓燕

引用本文:

张静,邹道勤,王海龙,孙晓燕. 3D打印混凝土层条间界面抗拉性能与本构模型[J]. 浙江大学学报(工学版), 2021, 55(11): 2178-2185.

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.

链接本文:

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

组分 wB 组分 wB
CaO 40.68 MgO 1.45
SiO2 9.53 SO3 12.42
Al2O3 32.75 Na2O 0.08
Fe2O3 1.33 Loss 0.11
表 1  水泥化学成分
l/mm D/μm ft/MPa δ/% E/GPa ρ/(g·cm?3)
12 31 1600 7 43 1.3
表 2  PVA 纤维主要物理力学性能
图 1  抗拉试件尺寸及层条间界面说明
图 2  抗拉试验装置
图 3  界面抗拉性能测试用拉伸试件
图 4  CT扫描试件示意图
图 5  拉伸试验中试件的破坏模式
图 6  基体材料及层条间界面抗拉强度
图 7  直拉试验界面破坏形态
图 8  打印试件CT扫描3D重建模型
图 9  基体部分孔隙率研究区域（左视图）
图 10  基体部分孔隙率分布正态拟合结果
图 11  孔隙率研究区域
图 12  条间孔隙率变化曲线
图 13  层间孔隙率变化曲线
图 14  孔隙率和极限拉伸强度线性关系拟合曲线
图 15  孔隙率和极限拉伸应变线性关系拟合曲线
图 16  界面区材料的拉伸-位移曲线
图 17  层条间界面与基体材料的拉伸-变形曲线
图 18  基体材料的受拉应力-应变关系曲线
图 19  界面受拉应力-应变曲线计算值与试验值对比
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