Effect of different grade levels of calcined clays on fresh and hardened properties of ternary-blended cementitious materials for 3D printing

被引：110

作者：

Chen, Yu ^{[1
]}

Rodriguez, Claudia Romero ^{[1
]}

Li, Zhenming ^{[1
]}

Chen, Boyu ^{[1
]}

Copuroglu, Oguzhan ^{[1
]}

Schlangen, Erik ^{[1
]}

机构：

[1] Delft Univ Technol, Fac Civil Engn & Geosci, Microlab, Delft, Netherlands

来源：

CEMENT & CONCRETE COMPOSITES | 2020年 / 114卷

关键词：

3D concrete printing; Sustainability; Compressive strength; Hydration kinetics; Ternary-blended cementitious materials; Calcined clay; FLY-ASH MIXTURES; RHEOLOGICAL PROPERTIES; CONCRETE; EXTRUSION; PERFORMANCE; HYDRATION; DESIGN; BEHAVIOR; SILICA; METAKAOLIN;

D O I：

10.1016/j.cemconcomp.2020.103708

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This study aims to investigate the influences of different grades of calcined clay on 3D printability, compressive strength (7 days), and hydration of limestone and calcined clay-based cementitious materials. Calcined clays that contained various amounts of metakaolin were achieved by blending low-grade calcined clay (LGCC) and high-grade calcined clay (HGCC) in three different proportions. The results revealed that increasing the HGCC% ranging from 0 wt% to 50 wt% in calcined clay could: (1) increase the flow consistency; (2) impressively improve the buildability, and reduce the printability window of the fresh mixtures; (3) enhance and accelerate the cement hydration. However, increasing HGCC% led to an increase of air void content in the interface region of the printed sample, which weakened the compressive strength of the printed sample at 7 days. Besides, it confirmed that the cold-joint/weak interface was easily formed by using the fresh mixture with a high structuration rate.

引用

页数：20

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