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Please discuss the Determination of Normal Consistency of Hydraulic Cement

Please discuss the Determination of Normal Consistency of Hydraulic Cement

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 Normal Consistency of Hydraulic Cement

 

 

Materials and Equipment Cement Weighing scale Graduated cylinder Vicat apparatus Evaporating Dish Testing Procedure 1. Mixed a 650 grams of cement with a measured quantity of clean water following the procedure of mixing of hydraulic cement pastes and mortars of plastic consistency, as follows: a Place all mixing water in the bowl. b. Add cement to the water and allow 30 seconds for the absorption of the water. c Start mixer and mix at sloy speed (140 =5 rpm) for 30 seconds. d. Stop the mixer for 15 seconds and during this time scrape down into the batch any paste that may have collected on the sides of the bowl. e. Start the mixer at medium speed (285 =10 rpm) and mix for 1 minute. 2. Quickly form the cement paste into a ball and toss six times from one hand to the other maintaining the distance between the hands about 150 mm apart. 3. Press the ball into the larger end of the conical ring, filling the ring with paste completely. Remove the excess at the larger end by a single movement of the palm of the hand. 4. Place the ring on the base plate resting on larger end. Slice off the excess paste at the smaller end by a single oblique stroke of a sharp-edge trowel. Take care not to compress the paste during the cutting or smoothing excess paste. 5. Set the moving indicator to the upper zero back of the scale, or take an initial reading and release the rod immediately which must not exceed 30 seconds after completion of mixing. The apparatus shall be free of vibration during the test The paste shall be of normal consistency when the rod settles to a point 10 = 1 mm below the original surface in 30 seconds after being release. Calculation Calculate the amount of water required for normal consistency to the nearest 10 percent and report it to the nearest 50 percent of the weight of dry cement. N.C =- Wetght of water required (grams) Weight of cement sample (650 grams) (100%)
Transcribed Image Text:Materials and Equipment Cement Weighing scale Graduated cylinder Vicat apparatus Evaporating Dish Testing Procedure 1. Mixed a 650 grams of cement with a measured quantity of clean water following the procedure of mixing of hydraulic cement pastes and mortars of plastic consistency, as follows: a Place all mixing water in the bowl. b. Add cement to the water and allow 30 seconds for the absorption of the water. c Start mixer and mix at sloy speed (140 =5 rpm) for 30 seconds. d. Stop the mixer for 15 seconds and during this time scrape down into the batch any paste that may have collected on the sides of the bowl. e. Start the mixer at medium speed (285 =10 rpm) and mix for 1 minute. 2. Quickly form the cement paste into a ball and toss six times from one hand to the other maintaining the distance between the hands about 150 mm apart. 3. Press the ball into the larger end of the conical ring, filling the ring with paste completely. Remove the excess at the larger end by a single movement of the palm of the hand. 4. Place the ring on the base plate resting on larger end. Slice off the excess paste at the smaller end by a single oblique stroke of a sharp-edge trowel. Take care not to compress the paste during the cutting or smoothing excess paste. 5. Set the moving indicator to the upper zero back of the scale, or take an initial reading and release the rod immediately which must not exceed 30 seconds after completion of mixing. The apparatus shall be free of vibration during the test The paste shall be of normal consistency when the rod settles to a point 10 = 1 mm below the original surface in 30 seconds after being release. Calculation Calculate the amount of water required for normal consistency to the nearest 10 percent and report it to the nearest 50 percent of the weight of dry cement. N.C =- Wetght of water required (grams) Weight of cement sample (650 grams) (100%)
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