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首页 > 过刊浏览>2024年第27卷第8期 >675-684. DOI:10.3969/j.issn.1007-9629.2024.08.002
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3DPC硬化性能各向异性及其间隔时间依赖性
作者:
作者单位:

1.同济大学 先进土木工程材料教育部重点实验室，上海 201804;2.同济大学 材料科学与工程学院，上海 201804

作者简介:

李春锦（2000—），男，重庆人，同济大学硕士生.E-mail：licj @tongji.edu.cn

通讯作者:

蒋正武（1974—），男，安徽潜山人，同济大学教授，博士生导师，博士.E-mail： jzhw@tongji.edu.cn

中图分类号:

TU528.59

基金项目:

国家自然科学基金资助项目（U22B2076， 51878480， 52078369）；“十四五”国家重点研发计划项目（2022YFC3803104）；中央高校基本科研业务费专项资金


Anisotropy of Hardened Properties of 3D Printing Concrete and Its Dependence on Resting Time
Author:
Affiliation:

1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education， Tongji University， Shanghai 201804， China;2.School of Materials Science and Engineering， Tongji University， Shanghai 201804， China

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    摘要:

    通过对比3D打印混凝土（3DPC）和浇筑混凝土在不同测试方向上的强度和耐久性差异，探究了3DPC硬化性能各向异性特征及其对间隔时间的依赖性.结果表明：3DPC的硬化性能存在一定的各向异性，相较于平行于打印层方向，在垂直于打印层方向上的力学性能与抗渗性更高，其各向异性的产生与打印层间的弱黏结界面以及混凝土基体内孔隙和缺陷的分布有关；延长打印间隔时间，3DPC层间界面黏结性能明显变弱；3DPC不同打印层的耐久性存在差异，相较于下层混凝土，上层混凝土密实度较低，侵蚀性介质的扩散速率更快.

    Abstract:

    By comparing the strength and durability differences between 3D printing concrete（3DPC） and casting concrete in different test directions， the anisotropic characteristics of the hardened properties of 3DPC and its dependence on the resting time were explored. The results show that the hardened properties of 3DPC have certain anisotropy， and the mechanical properties and impermeability in the vertical direction are higher. The anisotropy of hardened properties is related to the weak bonding interface between printing layers and the distribution of pores and defects in the concrete matrix. The bonding property of interlayer interface is obviously weakened when resting time is prolonged. The durability of different printing layers of 3DPC is different， the density of the upper layer of concrete is lower， and the diffusion rate of the aggressive medium is faster.

    表 3 打印参数Table 3 Printing parameters
    表 1 水泥的化学组成Table 1 Chemical composition（by mass） of cement
    图1 3DPC试样及其切割区域的尺寸Fig.1 Size of 3DPC specimen and its cutting area（size： mm）
    图2 3D打印试件的层数、尺寸及坐标说明Fig.2 Layers， size and coordinates of 3D printing specimen（size： mm）
    图3 劈裂抗拉试验示意图Fig.3 Schematic diagram of splitting tensile test（size： mm）
    图4 试样断面图片Fig.4 Cross-section of specimens
    图5 3D打印试样界面劈裂抗拉强度Fig.5 Interface splitting tensile strength of 3D printing specimens
    图6 不同试样的氯离子扩散深度沿Z方向变化趋势Fig.6 Variation trend of chloride ion diffusion depth along Z direction of specimens
    图7 不同龄期下试样氯离子的扩散深度和扩散速率Fig.7 Diffusion depth and diffusion rate of chloride ion in specimens at different ages
    图8 试样Ts-O不同层间的氯离子扩散深度Fig.8 Chlorine ion diffusion depth between different layers of specimen Ts-O
    图9 不同试样碳化深度沿Z方向变化趋势Fig.9 Variation trend of carbonization depth of specimens tested along Z direction
    图10 试样不同龄期下的碳化深度Fig.10 Carbonization depth of specimens tested at different ages
    图11 Ts试样不同层间的碳化速率Fig.11 Different interlayer carbonation rates of specimen Ts
    图12 试样单位面积渗水速率随时间的变化趋势Fig.12 Variation trend of water seepage rate per unit area of specimens with time
    表 2 3DPC的配合比Table 2 Mix proportion of 3DPC
    表 4 试样的孔隙率Table 4 Porosity of specimens
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李春锦,任强,张翼,杨振东,蒋正武.3DPC硬化性能各向异性及其间隔时间依赖性[J].建筑材料学报,2024,27(8):675-684

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  • 收稿日期:2023-10-07
  • 最后修改日期:2023-11-20
  • 在线发布日期: 2024-09-03
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