Mechanical characteristics of high-performance concretes with substitution of fine aggregate by waste material from CETRIS Boards Production

This paper discusses the possibility of replacing fine aggregates in high performance concrete (HPC) with waste material from CETRIS boards production (WCM). CETRIS boards are made from a combination of fine wood chips and cement mortar, and a large amount of waste material is generated during their production (cutting and grinding of the boards). In this research, fine waste material from CETRIS boards was used as a potential replacement for fine aggregate in concrete. The high-performance concretes were designed with a maximum size of aggregates of 8 mm, water to binder ratio of 0.25 and 28-days compressive strength around 140 MPa. These types of concrete do not contain enough water for hydration of the cement, so an internal curing process carried out by pre-wetting aggregates can improve this situation. Influence of WCM substitution on workability, bending and compressive strength and modulus of elasticity of concrete are discussed in this paper. The frost resistance of concretes is discussed as well.