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(6. BÖLÜM) / (PART-6) - Kenan Bektaş - Pouring Concrete - Specimen For Crushing Test - Slump Test

6. BÖLÜM / (PART-6) - Kenan Bektaş - Pouring Concrete - Specimen For Crushing Test - Slump Test Guide to Pouring Concrete Step 1 - Site Work. Before concrete can be poured, the site needs to be prepared to reduce the chance of heaving from expansive soils and frost. ... Step 2 - Forming. ... Step 3 - Mixing. ... Step 4 - Placement. ... Step 5 - Early Finishing. ... Step 6 - Troweling. ... Step 7 - Final Finishing. ... Step 8 - Curing. Procedure of Concrete Slump test: The mold for the concrete slump test is a frustum of a cone, 300 mm (12 in) of height. The base is 200 mm (8in) in diameter and it has a smaller opening at the top of 100 mm (4 in). The base is placed on a smooth surface and the container is filled with concrete in three layers, whose workability is to be tested . Each layer is temped 25 times with a standard 16 mm (5/8 in) diameter steel rod, rounded at the end. When the mold is completely filled with concrete, the top surface is struck off (leveled with mould top opening) by means of screening and rolling motion of the temping rod. The mould must be firmly held against its base during the entire operation so that it could not move due to the pouring of concrete and this can be done by means of handles or foot - rests brazed to the mold. Immediately after filling is completed and the concrete is leveled, the cone is slowly and carefully lifted vertically, an unsupported concrete will now slump. The decrease in the height of the center of the slumped concrete is called slump. The slump is measured by placing the cone just besides the slump concrete and the temping rod is placed over the cone so that it should also come over the area of slumped concrete. The decrease in height of concrete to that of mold is noted with scale. (usually measured to the nearest 5 mm (1/4 in). Sampling of Cubes for Test Fill the concrete in the molds in layers approximately 5 cm thick. Compact each layer with not less than 35 strokes per layer using a tamping rod (steel bar 16mm diameter and 60cm long, bullet-pointed at lower end). Level the top surface and smoothen it with a trowel.