3D打印混凝土抗碳化性能各向异性及成因分析

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (5): 1704-1712.

• “3D 打印无机非金属材料”专题(II) • 上一篇下一篇

3D打印混凝土抗碳化性能各向异性及成因分析

王海龙^1,2, 侯建华¹, 孙晓燕^1,3, 蔺喜强¹, 路兰⁴

1.浙江大学建筑工程学院,杭州 310058;
2.山西浙大新材料与化工研究院,太原 030002;
3.浙江大学平衡建筑研究中心,杭州 310028;
4.杭州冠力智能科技有限公司,杭州 311241

收稿日期:2024-02-26 修订日期:2024-04-02 出版日期:2024-05-15 发布日期:2024-06-06
通信作者: 孙晓燕,博士,副教授。E-mail: selina@zju.edu.cn
作者简介:王海龙(1974—),男,博士,教授。主要从事3D打印混凝土材料与结构、长寿命结构的研究。E-mail:hlwang@zju.edu.cn
基金资助:
浙江省重点研发计划(2021C01022);国家自然科学基金(52079123,52279141);浙江省尖兵领雁计划(2023C01154);浙江省科技计划(2022C04005);山西浙大新材料与化工研究院资助项目(2021SZ-TD010,2022SZ-TD016);浙江大学平衡研究中心专项经费

Anisotropy and Cause Analysis of Carbonation Resistance of 3D Printed Concrete

WANG Hailong^1,2, HOU Jianhua¹, SUN Xiaoyan^1,3, LIN Xiqiang¹, LU Lan⁴

1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;
2. Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan 030002, China;
3. Center for Balance Architecture, Zhejiang University, Hangzhou 310028, China;
4. Hangzhou GuanLi Intelligent Technology Co., Ltd., Hangzhou 311241, China

Received:2024-02-26 Revised:2024-04-02 Online:2024-05-15 Published:2024-06-06

摘要/Abstract

摘要： 受挤出式工艺的影响,3D打印混凝土中存在较多的界面,影响着打印混凝土的耐久性能。为了探明3D打印成型混凝土抗碳化性能的各向异性变化规律,通过碳化试验研究了三种水胶比3D打印混凝土沿X、Y、Z三个方向的碳化行为。基于压汞试验和X-CT扫描获取了3D打印混凝土的孔隙特征和分布规律,从微观层面阐释3D打印混凝土抗碳化性能的变化机理。结果表明:孔隙与3D打印混凝土的碳化行为有着密切联系,层条间界面因条带堆叠产生了更多孔隙,因而CO₂在界面位置扩散速度更快,碳化深度更大;受界面的影响,打印混凝土的抗碳化性能具有明显的各向异性;基体部位材料的抗碳化性能优于层间界面,层间界面的抗碳化性能优于条间界面;水灰比越低,材料抗碳化性能越好;当CO₂在混凝土中扩散时,受层条间大孔隙的影响,打印成型混凝土中形成了未碳化岛。

关键词: 3D打印混凝土, 打印界面, 水胶比, 孔隙率, 碳化, CT扫描

Abstract: Attributed to extrusion technology, there are many interfaces in 3D printed concrete, such as interlayer and interstrip interfaces, which affect the durability of printed concrete. In order to investigate the effect of printed interfaces and water binder ratio on the carbonation resistance of 3D printed concrete, the carbonation behavior of 3D printed concrete with three water binder ratios along X, Y, and Z directions was studied through carbonation tests. Based on mercury intrusion testing and X-CT scanning, the pore characteristics and distribution patterns in 3D printed concrete were obtained, and the change mechanism of carbonation resistance of 3D printed concrete was explained from a microscopic level. The research results indicate that pores are closely related to the carbonation behavior of 3D printed concrete. The interstrip and interlayer interfaces generate more pores due to the stacking of stripes, resulting in faster diffusion of CO₂ and greater carbonation depth at these two positions. Therefore, the carbonation resistance of printed concrete exhibits significant anisotropy due to the influences of interfaces. The carbonization resistance of matrix material is better than that of interlayer position and the carbonization resistance of interlayer position is better than that of interstrip position. The lower the water binder ratio is, the better the carbonization resistance of material is. When CO₂ diffuses in concrete, the uncarbonized islands are formed in printed concrete due to the effect of large pores between layers.

Key words: 3D printed concrete, printed interface, water binder ratio, porosity, carbonation, CT scanning

中图分类号:

TU528

王海龙, 侯建华, 孙晓燕, 蔺喜强, 路兰. 3D打印混凝土抗碳化性能各向异性及成因分析[J]. 硅酸盐通报, 2024, 43(5): 1704-1712.

WANG Hailong, HOU Jianhua, SUN Xiaoyan, LIN Xiqiang, LU Lan. Anisotropy and Cause Analysis of Carbonation Resistance of 3D Printed Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(5): 1704-1712.

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3D打印混凝土抗碳化性能各向异性及成因分析

Anisotropy and Cause Analysis of Carbonation Resistance of 3D Printed Concrete

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