3D打印混凝土抗碳化性能各向异性及成因分析

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国家科技期刊平台
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中文摘要：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.

外文标题：Anisotropy and Cause Analysis of Carbonation Resistance of 3D Printed Concrete

外文摘要：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 3 D printed concrete,the carbonation behavior of 3 D 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.

外文关键词：

3 D printed concreteprinted interfacewater binder ratioporositycarbonationCT scanning

作者：

王海龙、侯建华、孙晓燕、蔺喜强、路兰

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作者单位：

浙江大学建筑工程学院,杭州 310058

山西浙大新材料与化工研究院,太原 030002

浙江大学平衡建筑研究中心,杭州 310028

杭州冠力智能科技有限公司,杭州 311241

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关键词：

3D打印混凝土打印界面水胶比孔隙率碳化 CT扫描

基金：

浙江省重点研发计划国家自然科学基金国家自然科学基金浙江省尖兵领雁计划浙江省科技计划山西浙大新材料与化工研究院项目山西浙大新材料与化工研究院项目浙江大学平衡研究中心专项

项目编号：

2021C0102252079123522791412023C011542022C040052021SZ-TD0102022SZ-TD016

出版年：

2024

硅酸盐通报

中国硅酸盐学会中材人工晶体研究院

硅酸盐通报

CSTPCD北大核心

影响因子：0.698

ISSN：1001-1625

年,卷(期)：2024.43(5)