长沙理工大学学报(自然科学版)
不同打印与加载方向下3D打印地质聚合物混凝土力学性能研究
作者:
作者单位:

(1.浙江大学 建筑工程学院,浙江 杭州 310058;2.山西浙大新材料与化工研究院,山西 太原 030002;3. 浙江大学 平衡建筑研究中心,浙江 杭州 310028)

作者简介:

孙晓燕(1976—)(ORCID:0000?0003?0708?9565),女,副教授,主要从事工程结构智能建造技术与结构全寿命可靠性方面的研究。E?mail:selina@zju.edu.cn

通讯作者:

孙晓燕(1976—)(ORCID:0000?0003?0708?9565),女,副教授,主要从事工程结构智能建造技术与结构全寿命可靠性方面的研究。E?mail:selina@zju.edu.cn

中图分类号:

TU528.41

基金项目:

浙江省重点研发计划项目(2021C01022);国家自然科学基金资助项目(52079123);浙江省科技计划项目(2022C04005);山西浙大新材料与化工研究院资助项目(2021SZ?TD010、2022SZ?TD016);浙江大学平衡建筑研究中心配套资金资助项目(20212742、20212738)


Mechanical properties of 3D printed geopolymer concrete under different printing and loading directions
Author:
Affiliation:

(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)

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    摘要:

    【目的】探究3D打印矿渣-粉煤灰基地质聚合物混凝土(以下简称为打印混凝土)力学性能随龄期的发展规律和其各向异性的特点。【方法】通过力学试验测试打印混凝土在不同养护龄期和沿x、y、z 3个不同加载方向的立方体抗压强度、轴心抗压强度、抗折强度,并利用X?CT扫描仪测试、分析打印混凝土的微观结构,探讨打印地质聚合物混凝土力学性能的变化机理。【结果】打印混凝土3和7 d养护龄期的力学强度分别达28 d的30%和60%以上,打印混凝土具有早强特性,满足混凝土打印建造需求;养护28 d试件的立方体抗压强度、轴心抗压强度和抗折强度在各加载方向上的差异分别为3.20%~10.40%、1.53%~7.05%和5.10%~24.00%。【结论】打印混凝土强度具有一定的各向异性,其各向异性主要源于在层条堆积过程中打印混凝土内部产生的缺陷数量和缺陷的空间分布。

    Abstract:

    [Purposes] The paper aims to figure out the development regulation and anisotropy of mechanical properties of 3D printed slag?fly ash?based geopolymer concrete with age. [Methods] The cubic compressive strength, axial compressive strength and flexural strength of printed geopolymer concrete at different curing ages and along x, y and z loading directions were tested in this study. X?ray CT scanner was used to analyze the microstructure and clarify the influence mechanism on the mechanical properties of printed concrete. [Findings] The mechanical strengths of printed concretes at 3 and 7 d were more 30% and 60% than that at 28 d, respectively. The printed concrete had an early strength and met the requirement of concrete printing construction. The differences in cubic compressive strength, axial compressive strength and flexural strength of the specimens cured for 28 d in each loading direction were in the range of 3.20%-10.40%, 1.53%-7.05% and 5.10%-24.00%, respectively. [Conclusions] The printed concrete exhibited certain anisotropy in mechanical performance, mainly due to the number and spatial distribution of defects in the material during the stacking process of the printed concrete.

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王海龙,陈亚飞,邹道勤,等.不同打印与加载方向下3D打印地质聚合物混凝土力学性能研究[J].长沙理工大学学报(自然科学版),2022,19(4):55-63.
WANG Hailong, CHEN Yafei, ZOU Daoqin, et al. Mechanical properties of 3D printed geopolymer concrete under different printing and loading directions[J]. Journal of Changsha University of Science & Technology (Natural Science),2022,19(4):55-63.

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  • 在线发布日期: 2023-01-16
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