Section:900
DLC Cube Casting:
test cubes 150*150*150mm size shall be made immediately from each mix sample. cubes shall be made in accordance with the methods described in IS:516 except that the cubes shall be compacted by means of a vibratory hammer with the moulds Placed on a level and rigid base. The vibrating hammer shall be electric or pneumatic types fitted with a square or rectangular foot having an area of between 7500 to 14000 sq.mm. the compaction shall be uniformly applied for 60±5 seconds with a downward force of between 300N and 400N on to each of the three layers of the lean concrete material placed into mould. The surface of each compacted layer shall be scarified before the next layer is added to give key for the next layer. The final layer shall be finished flush with the top of the cube mould.
The Dry lean concrete shall be cured in accordance with IS:516.
Minimum 7 days compressive strength of any individual cube should not be less than 7.5 N/sq. mm.
7 days average compressive strength of each consecutive group of 5 cubes should not be less than 10 N/sq. mm.
3 cubes per 1000 sqm shall be casted.to check the strength.
DLC Hammer For compact cube mould 150mm/100mm.
Power supply: 230 I ph. 50-60 Hz 600w
Approx. weight 10 kg
Max impact rate 3000/4000/min
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