Bulk Density Of Fresh Mortar Essay
4.1.2. Bulk density of fresh mortar The bulk density of fresh mortar is determined by calculating the mass of mortar contained in a known volume. The bulk density of fresh mortar was determined following BS EN 1015-6 (1999). A sample of fresh mortar with a minimum volume of 3 liters. Three different methods of compacting mortar with the calibrated container which should have a volume of approximately one liter are given are in the BS Standard. The method to be used depends upon the consistency of the fresh mortar as determined by the flow table test. In this paper, all the mixtures achieved a flow table value of 155 mm, the flow table value of 155± 10 mm indicating plastic mixtures. The results for the bulk density of fresh mortar with use second method for all mortars are shown in Fig. 6. It can be observed that mortars containing CWP (CP5, CP10, CP15, CP20, CP25) present the lower values. This can be attributed to the density of CWP, which was the lower than cement.
4.1.3. Setting time
This test was performed in conformity with the requirement of ASTM-C191 (2008). This test method determines the time of setting of cement by means of the Vicat needle. Two test methods are given;
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The dry bulk density (DBD) of mortars was determined following BS EN 1015-10 (1999). It entailed weighing the mass of mortar prisms, which were dried in an oven at a constant temperature of approximately 60 C constantly until consecutive weights (within 2 h interval) were the same. Consequently, the average weight was divided by the volume to obtain the DBD. The results of DBD of mortar specimens are presented in Fig. 8. Although there was only slight variability in the DBD of the mortars. However, the density of the control mortar (CP0) was higher than those of other mixes, because the density of cement is greater than
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