cement Laboratory tests:Consistency • The purpose of this test is to determine the percentage of water required for preparing cement pastes for other tests. • Take 300 gm of cement and add 30 percent by weight or 90 gm of water to it. • Mix water and cement thoroughly. • Fill the mould of Vicat apparatus and the gauging time should be 3.75 to 4.25 minutes. • Vicat apparatus consists of aneedle is attached a movable rod with an indicator attached to it. • There are three attachments: square needle,plungerand needle with annular collar. • The plunger is attached to the movable rod.the plunger is gently lowered on the paste in the mould. • The settlement of plunger is noted.If the penetration is between 5 mm to 7 mm from the bottom of mould,the water added is correct.If not process is repeated with different percentages of water till the desired penetration is obtained. - Study24x7
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soyab khan
29 Mar 2019 09:49 AM study24x7 study24x7

cement Laboratory tests:Consistency • The purpose of this test is to determine the percentage of water required for preparing cement pastes for other tests. • Take 300 gm of cement and add 30 percent by weight or 90 gm of water to it. • Mix water and cement thoroughly. •...

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