Calmetrix I-Cal 8000 User Manual page 18

Calmetrix I-Cal 8000 User Manual
10. For paste calorimetry, the following procedure is recommended:
a) Weigh up 100 grams of cement in a plastic 800ml beaker and cover.
b) Place a clean empty specimen cup onto the scale and weigh out the required amount of
admixture
c) Add water and diluted admixture for mix water addition to bring the total weight to 45
grams (for a W/C of ratio of 0.45). Immediately start the logger for this cell.
d) Use a commercial laboratory mixer at a speed of 400 rpm for 4 minutes after the addition
of the water. Delayed addition admixtures are added at the 60-second mark and mixed for
the remaining 3 minutes. Tail End addition admixtures are added at the 15-second mark
and mixed for the remaining 3 minutes and 45 seconds Note that mix water must be
adjusted for any water in the admixture as the water to cement ratio is kept constant
unless otherwise requested.
e) Place an empty clean 125 ml plastic cup on the scale and tare. Carefully weigh out
approximately the paste amount required to reach 25 grams of paste. You must be
careful not to get any paste outside of the 125 ml sample cup. Record the total mass
of the sample and update in the Mix Configuration part on the I-Cal tab in CalCommander.
f) Quickly place the plastic lid on the sample cup and make sure cup is perfectly clean and
sealed.
g) Target the same time between start of mixing (i.e. when cement and water get in contact)
and loading into the calorimeter for all mixes in a test series.
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