Effects of Steel Fibers (SF) and Ground Granulated Blast Furnace Slag (GBBS) on Recycle Aggregate Concrete

Recycle aggregate is one of the good options to use in concrete as coarse aggregate which results environmental benefits as well as sustainable development. However, recycle aggregate cause reduction in concrete performance. One the other hand, the removal of industrial waste would be considerably decreased if it could be incorporated in cement concrete production. One of these possibilities is the substitution of the cement by slag, which enhance concrete poor properties of recycle aggregate concrete as well as provides to the decrease of cement consumption, reducing carbon dioxide productions, while resolving a waste management challenge. Furthermore, steel fiber was also added to hance the tensile capacity of recycle aggregate concrete. The main goal of this study is to investigate the characteristics of concrete using Ground granulated blast-furnace slag (GGBS) as binding material on recycle aggregate fibers reinforce concrete (RAFRC). Mechanical performance was assessed through compressive strength and split tensile strength, while durability aspects was study through water absorption, acid resistance and dry shrinkage. The results detected from the different experiments depict that replacement of Ground granulated blast-furnace slag (GGBS) enhance mechanical performance as well as durability aspects of the recycle aggregate fibers reinforce concrete (RAFRC).

The Use of Recycled Aggregate in a Development of Reinforced Concrete Container as a Retaining Wall: Preliminary Study

Construction waste has been increasing due to fast development of construction industries. These wastes usually end up on landfill or to be left nearby construction site. This paper focuses on the potential use of recycled waste aggregate in a development of reinforced concrete rectangular container, RACC, as a solid waste storage. The filled container is intended to be used as a retaining structure at riverbanks to control erosion. The experimental programme include cube and cylindrical specimens tested to determine characteristic properties of recycle aggregate concrete (Pc, Pt, E). The characteristic properties obtained were used in designing the RACC to function as storage container and also as a retaining wall as referred to BS 8110 and BS 8007. Results showed that recycle aggregate concrete has relatively high compressive strength, tensile strength and modulus of elasticity. RACC size of 1.0 m x 1.0 m x 1.0 m with 150 mm thickness is found to be suitable and safe to be used both as container and retaining wall. This is proven by the maximum deflection and crack widths achieved which are lower than the allowable limit values.