High performance lightweight concretes for 3D printing

Abstract

The paper is devoted to developing high-performance nanostructured concrete for 3D printing and study-ing its strength and operational characteristics. The research addresses issues related to the use of modern concrete chemistry, such as plasticisers and concrete hardening accelerators, and nanomodifica-tion by two types of nanocarbon: nanotores (Astralene) and sulphur graphene (Ugleron). The designed lightweight concrete for 3D printing has a compressive strength of about 70 MPa and 9 MPa after extru-sion at a density of about 1.55–1.6 kg/m³. Pozzolan additives from industrial waste in concrete are used, such as silica fume and oil shale ash. Microspheres, which are also industrial wastes, are used as light-weight aggregate and thixotropy regulators. As a result, lightweight, high-performance concrete for 3D printing was developed, which allows the disposal of industrial waste inside it.

Keywords

• high-performance concrete
• 3d printing
• compressive strength
• fine-grained concrete
• basalt fiber
• silica fume