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Answer Posted / satya paul
function of dry lean concrete is to provide firm base to support traffic over pqc pavement.there should be no bond between pqc and dry lean concrete.after laying dry lean concrete with the help of paver and compacted with roller passes.minimum eight times up and down i.e total 16 passes.it should be sprayed with MC0 grade bitumen primer.cracks will appear from 10m to 15 distance depending upon cement quantity,mix grading of aggregate ,temperature and wind speed,
before laying pqc ,500 micron anti static polythene sheet shall be laid over dry lean concrete.cube strength of dry lean concrete shall be 5n/mm2 and above.higher cement depends upon the strength required for sub base.max size of aggregate shall not be more than 20 mm.good mix falls in the middle portion,weaker mix falls at the ends.take sample from the end and compare with the middle portion of concrete.difference in strength shall not vary more than 6%.
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