21-07-2012, 04:11 PM
Crushed granite
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INTRODUCTION
Rock and crushed stone products generally are loosened by drilling and blasting and then are loaded by power shovel or front-end loader into large haul trucks that transport the material to the processing operations. Techniques used for extraction vary with the nature and location of the deposit. Processing operations may include crushing, screening, size classification, material handling and storage operations. All of these processes can be significant sources of PM and PM-10 emissions if uncontrolled.
LITERATURE REVIEW
FARID et al. Investigated the possibility of using crushed brick as coarse and fine aggregate for a new concrete. Either natural sand coarse aggregates or both were partially replaced (25%, 50%, 75%, and 100%) with crushed bricked aggregates compressive and flexural strengths up to 90 days of age were compared with those of concrete made with natural aggregates, porosity, water absorption, water permeability and shrinkage are also measured. The test results indicate that it is possible to manufactured concrete containing crushed bricks (course and fine ) with characteristics similar to those of natural aggregates concrete provided that the percentage or recycled aggregates is limited to 25% and 50% for the coarse and fine aggregates.
KUMUTHA et al. (2010) This report presents the effect of using recycled aggregates as the replacement of natural coarse aggregates or fine aggregates in concrete. Recycled aggregates consist of either crushed concrete or crushed bricks from the demolition wastes available locally. Tests were carried out to determine the density, compressive strength, split tensile strength, flexural strength and modulus of elasticity of concrete with and without recycled aggregates. Natural coarse aggregates in concrete were replaced with 0%, 20%, 40%, 60%, 80%, and 100% of crushed concrete aggregates. Natural fine aggregates in concrete were replaced with 0%, 20%, 40%, 60%, 80%, and 100% of crushed brick aggregates.
EXPERIMENTAL INVESTIGATIONS
MARERIAL INVESTIGATIONS
CGF: Rock and crushed stone products generally are loosened by drilling and blasting and then are loaded by power shovel or front-end loader into large haul trucks that transport the material to the processing operations. Processing operations may include crushing, screening, size classification, material handling and storage operations. The crusher particle sizes normally range from 5 to 20mm.
MIX DESIGN
GENERAL
This chapter deals with the computation of the theoretical calculation such as Mix design. The concrete mix has been designed for M30 grade as per IS 10262-1982. The specified concrete grade involves the economical selection of cement, fine aggregate, coarse aggregate and water. Although compliance with respect to characteristics strength is the main criteria acceptance, it is implicit that concrete must also have desired workability in the fresh state and impermeability in the fresh state and impermeability and durability in hardened state.
MIX DESIGN FOR M30 GRADE CONCRETE
Mix design on recommended guide lines is really a process of making an initial guess at optimum combination of ingredients and final mix proportion is obtained only on the basis of further trail mixes. As mentioned earlier under the project a comparative study was carried. To arrive at a concrete mix for this mix design M30 concrete was carried as per IS code.
CONCLUSION
In the first phase of the project work theoretical and experimental investigation were carried out and the following result were obtained.
• The specific gravity of the cement tested is 3.1.
• The specific gravity of fine aggregate tested is 2.52.
• The specific gravity of coarse aggregate tested is 2.61.
• Fineness modulus of the fine aggregate tested is 2.70.
• Fineness modulus of the coarse aggregate tested is 2.58.
• Bulk density of fine aggregate tested is 1615.17Kg/m3
• Bulk density of coarse aggregate tested is 1581.17Kg/m3
• The mix design for M30 concrete is arrived as 1:1.48:2.40 and the water content is 0.45.