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COMPRESSIVE STRENGTH OF CONCRETE

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  COMPRESSIVE STRENGTH OF CONCRETE AIM: To determine the compressive strength of the concrete. APPARATUS REQUIRED: 1. Compressive testing machine 2. Curing Tank  3. Cube mould SAMPLE: The composite sample shall be truly representative of the batch and shall not be less than 0.02 m3 in volume. It shall be composed of the mixture of proportions taken from the different points in the batch. When continuous mixtures are used, a batch shall be regarded as the discharge from the mixture during one minute. PROCEDURE: CUBE CASTING Assembling the mould for use, clean and apply the oil thin coating entire contact surfaces of the bottom of the mould and the base plate in order to ensure that no water escapes during the filling. Fill the concrete in the moulds in layers approximately 5cm thick When compacting by hand, the standard tamping bar shall be used and the strokes of the bar shall be distributed in a uniform manner over the cross-section of the mould. Compact each layer ...
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BULKING OF SAND TEST

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  BULKING OF SAND TEST AIM:   §   This procedure covers the test method for the determination of the approximate volumes occupied by sand in a damp condition and when saturate. §   This method of test covers the field method for determining the necessary adjustment for the bulking of fine aggregate. APPARATUS REQUIRED: 1. Measuring jar  250ml 2.      Potable Water SAMPLE: The cement taken should be finely ground material which of addition of requisite quantity of water is capable of hardening both under water and in air by the chemical interaction of its constituents with water and capable of binding together the appropriate materials. (Reference IS: 3535 - 1986) PROCEDURE: 1. In a 250ml measuring jar pour the sand until it reaches the 200ml  2. Then fill the cylinder with water and stir the sand well (The water shall be sufficient to submerge the sand completely) 3. Now the sand surfaces will be below its original level 4. Th...
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SETTING TIME OF CEMENT

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  SETTING TIME OF CEMENT AIM:             To determine the initial and final setting time of cement. APPARATUS REQUIRED: Vicat apparatus confirming to IS: 5513-1976 Stop Watch Measuring jar Metal Tray Weigh balance SAMPLE The cement taken should be finely ground material which of addition of requisite quantity of water is capable of hardening both under water and in air by the chemical interaction of its constituents with water and capable of binding together the appropriate materials. (Reference IS: 3535 - 1986) PROCEDURE: Prepare a neat cement paste by gauging the cement (500g) with 0.85 times the water required to give a paste of standard consistency. The paste shall be gauged in the manner under the condition prescribed in IS: 4031(Part)-1988 Start the stop watch at the instant when the water is added to the cement. Record th...
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BULK DENSITY TEST OF COARSE AGGREGATE

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 BULK DENSITY TEST OF COARSE AGGREGATE AIM: The bulk density of the coarse aggregate could be found out. BULK DENSITY: Bulk density is that mass of substance by unit volume and is in kg/lit as per the requirement of this standard. APPARATUS: 1. Density cylinder 2. Weighing Balance 3. Tamping Rod 4. Shovel SAMPLE: This test is usually conducted on dry aggregate that fee that does not contain any unwanted materials. See: Reference IS: 2386 (Part III) 1963). PROCEDURE: 1. Weigh out to the nearest 0.1gm. 50g of the sample. 2. Pour the sample in an appropriate graduated cylinder and fill the sample in three layers. 3. The sample will be packed to be approximately one-third full with thoroughly mixing aggregate and tamped 25strokes of the rounded end of the tamping rod. 4. Another similar measure of aggregate would then be added and 25 strokes more of tamping would then be rendered. 5. Up to 25 times there should be the last layer filled to overflowing and tamping. 6. The aggregate has t...
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SPECIFIC GRAVITY TEST OF COARSE AGGREGATE

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  SPECIFIC GRAVITY TEST OF COARSE AGGREGATE AIM: To determine the Specific gravity of the aggregate using Pycnometer . APPARATUS REQUIRED: 1. Pycnometer of about 1 litter capacity 2. Weighing balance, with an accuracy of 1g.                  3. Vacuum pump  4. Oven                                                                                           SAMPLE: The sample of 2000g to 1000g of aggregate shall be taken for tested. The aggregate which have been heated artificially shall not be taken. Reference IS: 2386 (Part III) – 1963 ). ads PROCEDURE: 1. A sample of 1kg for 10mm to 4.75mm size and 500gm for less than 4.75mm size. The sample is placed in a tray and fully covered w...
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SILT CONTENT TEST OF FINE AGGREGATE

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SILT CONTENT TEST OF FINE AGGREGATE AIM: To determine the Silt content in the Fine aggregate. APPARATUS REQUIRED: Glass Measuring jar                                                                                               PROCEDURE: A measuring jar of (200 – 500ml) should be half filled with the sample. Water is added to the jar up to the 3/4th of its full capacity. The jar with water should be shaken for at least 30seconds, so that all the silt particle get mixed with water and jar is kept in undisturbed condition for two hour. After the clay and silt content settle down, the height of the clay and silt standing over the fine aggregate should be measured. ads OBSERVATION:   SI.No   Trail  ...
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