stem extending through the lower slot. The apparatus may be assembled by any convenient supporting equipment. 12.3 Procedure: 12.3.1 Prepare the sample of quicklime (as rapidly as possible to prevent sample deterioration) so that a majority of the material passes a 3.35 m (No. 6) sieve. Place the sample in an airtight container and allow to come to room temperature before testing. The slaking rate of lime is significantly affected by the particle size of the sample and must be as close to a 3.35 m (No. 6) sieve as possible. It is not necessary that 100 % of the sample pass a 3.35 m (No. 6) sieve, but all of the sample, including the plus 3.35 m (plus No. 6) fraction, must be used in the test. 12.3.2 Slaking Rate—Adjust the temperature of about 500 mL of distilled water in accordance with the schedule given in Table 1, and add the specified amount to the Dewar flask. Set the agitator revolving at 400 6 50 r/min. The temperature of the water in the flask must be 60.5°C of the desired temperature. Quarter and weigh out the required amount of the prepared quicklime sample. Add the quicklime to the water without delay and simultaneously begin timing. Put the covers in place immediately. Take a reading at each 30 s interval. 12.3.3 Continue readings until less than 0.5°C temperature change is noted in each of three consecutive readings. The total active slaking time will then be the time at which the first of the three consecutive readings was taken. The temperature at this time will be considered the final reaction temperature. Subtract the initial temperature from the final temperature to obtain the total temperature rise. Subtract the initial temperature from the temperature at 30 s for the temperature rise in 30 s. Subtract the initial temperature from the temperature at 3 min for the temperature rise in 3 min. 12.4 Report: 12.4.1 Record the actual temperature rise and plot a suitable