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how to find specific gravity of fine aggregate

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how to find specific gravity of fine aggregate Apparatus and material 1.       Pycnometer bottle 2.       Balance of accuracy 0.001g 3.       Vacuum source 4.       Fine aggregate    Procedure 1.         For fine aggregate particle size less than 4.75 mm 500 gram of sample taken. 2.       The pycnometer bottle should be well washed, cleaned, dried, and weighted accurately on sensitive balance. 3.       It should than be filled with water to the top of the hole, so that surface of Water in the hole is flat. 4.       The pycnometer than be dried on the outside & weighted accurately. 5.         About 500 grams of the above sample was transferred to the pycnometer & weighted. 6.       The pycnometer was filled with water and dry air entrapped in the aggregate was topped with water to the level or the hole in the cone as before and the entire front removed from the surface. 7.         The pycnometer was
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How to Find specific gravity of coarse aggregate

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specific gravity of coarse aggregate    Apparatus and materials 1.       Spring balance 2.       Weight balance 3.       Coarse aggregate of weight 2kg 4.       Bucket                       5.       Water tank 6.       Oven Procedure 1.       Aggregate not less than 2 kg was taken. It was carefully washed to eliminate the finer particles and dust. 2.       It was then positioned in a wire basket and deep in distilled water at a temperature between 22° to 32°C. 3.       Immediately after absorption, the entrapped air was removed from the sample by lifting the basket it 25 mm above the base of the tank and allowing it to drop 25 times at the rate of about one drop per sec. During the operation, caution was taken that the basket and aggregate remain completely immersed in water. 4.       They were kept in water for a period of 24 ± 1/2 hours afterwards. 5.       The basket and aggregate were then jolted and weighed (weigh
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Super plasticizer (SP) & VMA (viscosity modifying agent)

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Super plasticizer (SP) High-range water reducer, also known as super plasticizer, has made a breakthrough in concrete industry. It is an essential material component that must be used to produce SCC. The HRWRs improve the flowing ability of SCC by their liquefying and dispersing actions. They reduce the yield stress and plastic viscosity of concrete by their liquefying action and thus provide a good flowing ability in SCC. In addition, the HRWRs deflocculated the cement particles and free the trapped water by their dispersing action, and hence enhance the flowing ability of SCC. In dispersing action, the inter-particle friction and thus the flow resistance are also decreased, and therefore the flowing ability of concrete is improved. High-range water reducers can either increase the strength by lowering the quantity of mixing water for a given flowing ability, or reduce both cement and water contents to achieve a given strength and flowing ability. They contribute to
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