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Please discuss the Determination of Time of Setting of Hydraulic Cement by Vicat Aparatus

Please discuss the Determination of Time of Setting of Hydraulic Cement by Vicat Aparatus

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Please discuss the Determination of Time of Setting of Hydraulic Cement by Vicat Aparatus

 

Materials and Equipment Portland cement Scales and weight Graduated cylinder, 200 or 250 ml capacity Vicat apparatus Procedure 1. Preparation of Cement Paste Mix 650 grams of cement with the percentage required for normal consistency following the procedure of mixing hydraulic cement pastes and mortars of Plastic consistency. 2. Molding of Test Specimen a Quickly form a cement paste into a ball and toss six times from one hand to the other maintaining the distance between the hands about 152 mm apart. b. Press the ball into the conical ring filling the ring with paste completely. Remove the excess| paste by a single movement of the palm of the hand. c. Place the ring on a glass plate. Šlice off the excess paste by a single oblique stroke of a sharp-edged trowel. Take care not to compress the paste during cutting or smoothing excess paste. d. Immediately after molding, place the specimen in the moist closet or moist room with a temperature of 23°Cc (734 F) =1.7°C (3°F) ; and allow it to remain there except when determinations of time of setting are being made. The specimen shall remain in the conical mold, supported by the glass plate throughout the test period. 3. Time of setting Determination a Allow the specimen to remain in the moist cabinet or room for 30 minutes after molding without being disturbed. Determine the penetration of the one mm needle at this time and every 15 minutes thereafter until a penetration of 25 mm or less is obtained. b. For the penetration test, lower the needle of the rod until it rests on the surface of the cement paste. Tighten the set screw and set the indicator at the upper end of the scale, or take an initial reading. Release the rod quickly by releasing the set screw and allow the needle to settle for 30 seconds, then take the reading to determine the penetration. No penetration test shall be made closer than 4 in. from any previous penetration and nor shall be made closer than 3/8 in from the inside mold. c. Record the results of all penetration tests and, by interpolation detemine the time when a penetration of 25 mm is obtained which the initial is setting time. d. At the time the needle does not sink visible into the paste, it is considered too be final setting time.
Transcribed Image Text:Materials and Equipment Portland cement Scales and weight Graduated cylinder, 200 or 250 ml capacity Vicat apparatus Procedure 1. Preparation of Cement Paste Mix 650 grams of cement with the percentage required for normal consistency following the procedure of mixing hydraulic cement pastes and mortars of Plastic consistency. 2. Molding of Test Specimen a Quickly form a cement paste into a ball and toss six times from one hand to the other maintaining the distance between the hands about 152 mm apart. b. Press the ball into the conical ring filling the ring with paste completely. Remove the excess| paste by a single movement of the palm of the hand. c. Place the ring on a glass plate. Šlice off the excess paste by a single oblique stroke of a sharp-edged trowel. Take care not to compress the paste during cutting or smoothing excess paste. d. Immediately after molding, place the specimen in the moist closet or moist room with a temperature of 23°Cc (734 F) =1.7°C (3°F) ; and allow it to remain there except when determinations of time of setting are being made. The specimen shall remain in the conical mold, supported by the glass plate throughout the test period. 3. Time of setting Determination a Allow the specimen to remain in the moist cabinet or room for 30 minutes after molding without being disturbed. Determine the penetration of the one mm needle at this time and every 15 minutes thereafter until a penetration of 25 mm or less is obtained. b. For the penetration test, lower the needle of the rod until it rests on the surface of the cement paste. Tighten the set screw and set the indicator at the upper end of the scale, or take an initial reading. Release the rod quickly by releasing the set screw and allow the needle to settle for 30 seconds, then take the reading to determine the penetration. No penetration test shall be made closer than 4 in. from any previous penetration and nor shall be made closer than 3/8 in from the inside mold. c. Record the results of all penetration tests and, by interpolation detemine the time when a penetration of 25 mm is obtained which the initial is setting time. d. At the time the needle does not sink visible into the paste, it is considered too be final setting time.
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