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Stone waste for Green concrete

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Jayeshkumar PitrodaStone waste is one of the most active research areas that encompass a number of disciplines including civil engineering and construction materials. Jayeshkumar Pitroda, Assistant Professor& Research Scholar, Civil Engg Department, B.V.M. Engineering College, Gujarat in his research study investigates the behavior of concrete while replacing of waste with different proportions of stone waste by using tests like compression strength.

The cost of natural resources has forced industries to focus on recovery, and finding other alternatives. The use of the replacement materials not only offer cost reduction and energy savings but arguably superior products and fewer hazards in the environment also.

pile of waste asphalt and gravel in forestPresently large amounts of stone waste is generated in natural stone processing plants with an important impact on environment and humans. The stone waste & dust is dumped in nearby pits or vacant spaces. This leads to serious dust pollution and occupation of a vast area of land. Therefore, utilization of the stone dust in various industrial sectors especially the construction would help to protect the environment. A portion of this waste may be utilized on-site, such as for excavation refill or berm construction. The remaining can be used as a partial replacement of cement or fine aggregates or as a supplementary addition to achieve different properties of concrete.

gravel gray stone textures for asphalt mix concreteThe (PPC) cement was replaced by stone waste accordingly in the range of 0%, 10%, 20%, 30% 40%, & 50% by weight for M-25 grade concrete. Concrete mixtures were produced, tested and compared in terms of workability and strength to the conventional concrete.

Materials

A pozzolan is a cement extender that improves the strength and durability of the cement, even reducing the cost of producing concrete. PPC may take a longer time to settle than OPC, but it will eventually produce similar results given time.

Coarse AggregateAggregates are the important constituents in concrete. They give body to the concrete, reduce shrinkage and effect economy. One of the most important factors for producing workable concrete is a good gradationof aggregates. Good grading implies minimum voids which require minimum paste to fill up resulting in less quantity of cement and less water for increased economy, higher strength, lower shrinkage and greater durability.

Water, another essential ingredient of concrete actually participates in the chemical reaction with cement. Since it helps to from the strength giving cement gel, the quantity and quality of water are required to be looked into very carefully.

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