Yield stress and thixotropy control of 3D-printed calcium sulfoaluminate cement composites with metakaolin related to structural build-up

被引：160

作者：

Chen, Mingxu ^{[1
,2
]}

Yang, Lei ^{[1
,2
]}

Zheng, Yan ^{[1
]}

Huang, Yongbo ^{[1
]}

Li, Laibo ^{[1
]}

Zhao, Piqi ^{[2
]}

Wang, Shoude ^{[2
]}

Lu, Lingchao ^{[1
,2
]}

Cheng, Xin ^{[2
]}

机构：

[1] Univ Jinan, Sch Mat Sci & Engn, Jinan 250022, Peoples R China

[2] Univ Jinan, Shandong Prov Key Lab Preparat & Measurement Bldg, Jinan 250022, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 252卷

关键词：

Rheology; Structure deformation; CSA cement; Metakaolin; 3D printing; 3D PRINTING CONCRETE; FLY-ASH MIXTURES; RHEOLOGICAL PROPERTIES; MECHANICAL-PROPERTIES; FRESH PROPERTIES; GEOPOLYMER; EXTRUSION; ADMIXTURES; BEHAVIOR; DESIGN;

D O I：

10.1016/j.conbuildmat.2020.119090

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The three-dimensional (3D) structural build-up with the precision has proposed new requirements related to yield stress and thixotropy in the 3D-printed cementitious materials. In this study, the static and dynamic yielding behaviours of 3D-printed calcium sulfoaluminate (CSA) cement composites with metakaolin were studied to understand the relationship between thixotropy and structural build-up through the powder-based extrusion system. Experimental results show that the static yield stress implemented by the constant shear-rate-controlled protocol in the 3D-printed CSA cement paste increased significantly with rest time. Dynamic rheological behaviours were investigated by the Bingham and Herschel-Bulkley model. Given the change of flocculation structure and shear-thinning behaviour during the shear period, Herschel-Bulkley model is more suitable for studying the dynamic rheological properties of 3D-printed CSA cement paste. Moreover, the thixotropy can be well improved by the addition of metakaolin, and the correlation between the structure deformation and thixotropy of 3D-printed CSA cement paste further proved that the improved thixotropy is beneficial to 3D-printed structural build-up. In conclusion, developing a 3D-printed CSA cement composites with the controllable yield stress and thixotropy is significant for structural build-up in the 3D-printed construction materials. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：10

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