BS EN 196-9:2010 pdf download
BS EN 196-9:2010 pdf download.Methods of testing cement Part 9: Heat of hydration – Semi-adiabatic method.
5.2 Procedure
52.1 Mortar composition
The composition of the mortar shall be in accordance with EN 196-1 and the test sample shall have a total mass of (1 575 ± 1)g. Each batch of mortar to be mixed shall consist 01(360.0± 0.5)9 content; (1 080 ± 1)g sand froni a sample of CEN standard sand complying with the requirements in EN 196-1; and (180,0 ± 0,5)9 distilled or deionised water.
NOTE Since it is not possible to recover all the material added to the mixer bowl the mortar batch to be mixed sho..id be slightly more tItan 1 575g. the proportions by mass of the various constituents beiog maintained.
5.2.2 Mixing
The cement, the water, the sand, the mortar box, the mixer bowl and the other Instruments coming into contact with the mortar shall be stored in the test room.
With the mixer in the operating position, pour the sand and then the cement into the mixer bowl; homogenise the mixture of sand and cement for 30 s at low speed; pour in the water, record the time, and mix immediately at low speed for GOs; set the mixer to high speed and mix for a further 60 s.
NOTE In order to avoid thermal losses, it is recommended to carry out the mixing in a relativsly short It is for this reason that the mixing time prescribed it EN 196-1 has been shortened.
5.2.3 PositIonIng of the test sample
Immediately after mixing weigh (1 575 ± 1) g of mortar into the box (see 4.4) whidi has previously been weighed, with its lid, to an accuracy of ± 0,5 g. Ptace the lid in position making sure that it seals tightly. Fill the thermometer pocket with (2,5 ± 0,5) cm3 of oP (e.g. thin mineral oil) in order to improve the thermal contact between the test sample and the thermc,rneter.
Weigh the filled mortar box, to an accuracy of ± 0,59 in order to be able to check at the end of the test for any leakage of water vapour. Immediately after weighing place the mortar box in the test calorimeter (see 4.1) and close with the stopper. Immediately place the thermometer (see 4.3) In position in the thermometer pocket. so that It Is approximately In the centre of the test sample. Seal the opening across the stopper by means of the locking device.
NOTE The stopper can also be sealed by rriearw of a flexible sealant ci mastic.
Not more than 8 mm shall be taken for the mixing and the positioning of the test sample.
At the end of the test the mortar box with its contents shall be weighed again, to an accuracy of ± 0.5g. If a reduction in mass of more than 29 is found the test is not valid and shall be repeated
5.3 Measurement of heating
The tWne of addition of water shall be taken as the start of timing. The measurement of heating consists of reading. at specific moments In time, the temperature of the test sample and that of the Inert sample located In the reference calonmeter (see 4.2).
At least one reading shall be taken in the first 30 mm followed by readings at least every: 1 h for the first 24 h; 4 h during the second day; and 6 h until the expiry of the selected test period. The frequency of these measurements may be increased according to the characteristics of the cement being tested The time of each temperature reading shall be recorded in hours and minutes,
At each temperature reading the temperature nse of the test sample, 8.. shall be determined as rite difference between the temperature of the test sample. T5. and that of the inert sample, T,. in the reference calorimeter.
7 Expression of results
7.1 Reporting of results
The results of the measurements shall be set out in a test report. normally in the form & a table, indicating: the heat of hydration, in joules per gram of cement, at the specified hydration age and including intermediate results (eg. at. 12 h, one day, two days. three days. five days and seven days). as applicable.
The results reported for the heat of hydration shall be expressed. c joules per gram of cement to the nearest whole number.
