Author(s): Ammar Yahia and Ahmed Mostafa
Paper category: Proceedings
Book title: International RILEM Workshop on Rheological Measurements of Cement-based Materials IRWRMC’18
Editor(s): Chafika DJELAL, Yannick VANHOVE
Print-ISBN: 978-2-35158-230-5
e-ISBN: 978-2-35158-231-2
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 105 - 110
Total Pages: 6
Language: English

Abstract: Building concrete structures, such as residential and commercial buildings, bridges, etc., is time-consuming and expensive. The concrete 3D printing is an innovative contruction technic to reduce the time and cost of construction, and improve robustness. This technic consists in extruding the concrete through a nozzle to build structural components layer-by-layer without the use of formwork. Understanding the structural build-up of cement-based materials is a key factor to ensure their succsseful 3D printing. The structural build-up of cement suspensions is a complex phenomenon associated to both physical structuration and chemical rigidification due to hydration. The kinetics of structural build-up is affected by the mixture parameters, including solid concentration, reactivity of binder, shear history, temperature, and presence of admixtures. In this paper, an experimental investigation is carried out to investigate the physical and chemical structuration of cement-based suspensions. Furthermore, an analytical model is proposed to evaluate the build-up of cement suspensions. The generated data can contribute in enhancing the fundamental knowledge to ensure a better control of the degree of structural build-up of cement-based materials for successful 3D printing.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00

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