SELF-COMPACTING CONCRETE USING MARBLE AND GRANITE SAWING WASTES AS FILLER

2005 
Self-Compacting Concrete (SCC) is a mixture designed to flow and fill formworks without vibration. This performance is obtained by adjusting mixture components to produce both a fluid and stable mixture. SCC has been described as "the most revolutionary development in concrete construction for several decades". Originally developed to offset a growing shortage of skilled labor, it has proved to be economically beneficial because of a number of factors, including: faster construction, reduction in site manpower, better surface finishing, easier placing, improved durability, greater freedom in design, thinner concrete sections, reduced noise levels, absence of vibration, safer working environment. SCC has now been taken up with enthusiasm across Europe, for both site and precast concrete work. This concrete is able to flow under its own weight and completely fill the formwork, even in the presence of dense reinforcement, without the need of any vibration, whilst maintaining homogeneity. Nonpozzolanic fillers are frequently used to optimize the particle packing and flow behavior of cementitious paste in SCC mixes. Limestone filler has been the traditional material used in controlling segregation potential and deformability of fresh SCC. During the sawing of the ornamental stones in Espirito Santo state (Southeast of Brazil) a great amount of waste material is produced (65 thousand tons of waste per month), a by-product in the production of marble and granite slabs during the sawing process of rocks with an equipment called gang-saw, which in most cases are deposited at companies yards or deposited into water bodies. These wastes cause environmental degradation with pollution and contamination of water and soil. The technical feasibility of the utilization of marble and granite sawing waste (MGSW) as a filler to SCC was studied. This paper deals with the influence of finely ground MGSW on properties of SCC mixes in the fresh and hardened states. The aim of this work is to provide an overview of the possibility to use MGSW as alternative to concrete raw materials focusing the use in SCC as an economical and environmentally safe alternative for recycling wastes.
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