Extrusion of cement-based materials - an overview

RILEM Technical Letters

article

Arnaud Perrot¹  Damien Rangeard²  Venkatesh Naidu Nerella³  Viktor Mechtcherine³ 

[1] Univ. Bretagne Sud;INSA Rennes;Institute of Construction Materials

关键词: Cement-based materials;    Rheology;    Tribology;    Extrusion;    3D Printing;   

DOI  :  10.21809/rilemtechlett.2018.75

学科分类：社会科学、人文和艺术（综合）

来源: RILEM Publications SARL

【 摘 要 】

Extrusion is a process that consists in forcing a formable material to pass through a die having the cross-section of the part to be obtained. This way of processing is used with conventional and fibre-reinforced cement-based materials to fabricate various construction elements such as panels, pipes and roadside curbs. Recently, with the development of digital fabrication methods and especially 3D concrete printing by selective deposition, the extrusion techniques have experienced a significant increase in interest. This letter describes the screw and ram extrusion techniques and their applications in construction industry. Furthermore, the underlying mechanisms involved during extrusion flow are delineated and the roles of rheological and hydro-mechanical behaviours (the latter one in a soil mechanics sense) in defining the extrudability – ability of being extruded – of the cementitious materials are highlighted. Finally, specific points such as flow-induced anisotropy of fibre reinforced cementitious materials or surface defects are addressed.

【 授权许可】

CC BY