Cement Test - Soundness
AIM To determine the soundness of cement by Le-Chatelier method as per IS: 4031 (Part 3) - 1988. APPARATUS LE-CHATELIER'S TEST APPARATUS
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Cement Test - Initial And Final Setting Time
AIM To determine the initial and the final setting time of cement as per IS: 4031 (Part 5) - 1988. APPARATUS Vicat apparatus conforming to IS: 5513 - 1976 Balance, whose permissible variation at a load of 1000g should be +1.0g Gauging trowel conforming to IS: 10086 - 1982 PROCEDURE Prepare a cement paste by gauging the cement with 0.85 times the water required to give a paste of standard consistency (see Para 1.2). Start a stop-watch, the moment water is added to the cement. Fill the Vicat mould completely with the cement paste gauged as above, the mould resting on a non-porous plate and smooth off the surface of the paste making it level with the top of the mould. The cement block thus prepared in the mould is the test block. A) INITIAL SETTING TIME Place the test block under the rod bearing the needle. Lower the needle gently in order to make contact with the surface of the cement paste and release quickly, allowing it t...
Cement Test - Consistency
AIM To determine the quantity of water required to produce a cement paste of standard consistency as per IS: 4031 (Part 4) - 1988. PRINCIPLE The standard consistency of a cement paste is defined as that consistency which will permit the Vicat plunger to penetrate to a point 5 to 7mm from the bottom of the Vicat mould. APPARATUS VICAT APPARATUS Vicat apparatus conforming to IS: 5513 - 1976 Balance, whose permissible variation at a load of 1000g should be +1.0g Gauging trowel conforming to IS: 10086 - 1982 PROCEDURE Weigh approximately 400g of cement and mix it with a weighed quantity of water. The time of gauging should be between 3 to 5 minutes. Fill the Vicat mould with paste and level it with a trowel. Lower the plunger gently till it touches the cement surface. Release the plunger allowing it to sink into the paste. Note the reading on the gauge. Repeat the above procedure taking fresh samples of cement and different quantities ...
Cement Test - Fineness
AIM To determine the fineness of cement by dry sieving as per IS: 4031 (Part 1) - 1996. PRINCIPLE The fineness of cement is measured by sieving it through a standard sieve. The proportion of cement, the grain sizes of which, is larger than the specified mesh size is thus determined. APPARATUS IS SIEVE Balance capable of weighing 10g to the nearest 10mg 90μm IS Sieve A nylon or pure bristle brush, preferably with 25 to 40mm bristle, for cleaning the sieve PROCEDURE Weigh approximately 10g of cement to the nearest 0.01g and place it on the sieve. Agitate the sieve by swirling, planetary and linear movements, until no more fine material passes through it. Weigh the residue and express its mass as a percentage R1, of the quantity first placed on the sieve to the nearest 0.1 percent. Gently brush all the fine material off the base of the sieve. Repeat the whole procedure using a fresh 10g sample to obtain R2. Then calculate R a...