TY - JOUR
T1 - Limestone and Calcined Clay-Based Sustainable Cementitious Materials for 3D Concrete Printing
T2 - A Fundamental Study of Extrudability and Early-Age Strength Development
AU - Chen, Yu
AU - Li, Zhenming
AU - Chaves Figueiredo, Stefan
AU - Copuroglu, Oguzhan
AU - Veer, Fred
AU - Schlangen, E.
N1 - Part of the Special Issue Low Binder Concrete and Mortars
PY - 2019
Y1 - 2019
N2 - The goal of this study is to investigate the effects of different grades of calcined clay on the extrudability and early-age strength development under ambient conditions. Four mix designs were proposed. Three of them contained high, medium, and low grades of calcined clay, respectively, and one was the reference without calcined clay. In terms of extrudability, an extrusion test method based on the ram extruder was introduced to observe the quality of extruded material filaments, and to determine the extrusion pressure of tested materials at different ages. For evaluating the very early-age strength development, the penetration resistance test, the green strength test, and the ultrasonic pulse velocity test were applied. Furthermore, the mechanical properties of the developed mix designs were determined by the compressive strength test at 1, 7 and 28 days. Finally, the main finding of this study was that increasing the metakaolin content in calcined clay could significantly increase the extrusion pressures and green strength, shorten the initial setting time and enhance the compressive strength at 1, 7, and 28 days.
AB - The goal of this study is to investigate the effects of different grades of calcined clay on the extrudability and early-age strength development under ambient conditions. Four mix designs were proposed. Three of them contained high, medium, and low grades of calcined clay, respectively, and one was the reference without calcined clay. In terms of extrudability, an extrusion test method based on the ram extruder was introduced to observe the quality of extruded material filaments, and to determine the extrusion pressure of tested materials at different ages. For evaluating the very early-age strength development, the penetration resistance test, the green strength test, and the ultrasonic pulse velocity test were applied. Furthermore, the mechanical properties of the developed mix designs were determined by the compressive strength test at 1, 7 and 28 days. Finally, the main finding of this study was that increasing the metakaolin content in calcined clay could significantly increase the extrusion pressures and green strength, shorten the initial setting time and enhance the compressive strength at 1, 7, and 28 days.
KW - 3D concrete printing
KW - Early-age strength
KW - Extrudability
KW - Limestone and calcined clay
KW - Sustainable
UR - http://www.scopus.com/inward/record.url?scp=85065719520&partnerID=8YFLogxK
U2 - 10.3390/app9091809
DO - 10.3390/app9091809
M3 - Article
VL - 9
JO - Applied Sciences (Switzerland)
JF - Applied Sciences (Switzerland)
IS - 9
M1 - 1809
ER -