Sunday, June 17, 2018

THINGS SITE ENGINEER MUST KNOW

A Vision To Clear Solutions.


v  Minimum thickness of slab is 125mm
v  Water absorption should not be more than 15%
v  Dimension tolerance for cubes +-2mm
v  Compressive strength of bricks is 3.5 N/mm2
v  Maximum Free fall of concrete allowed is 1.50m
v  In soil filling as per IS code for every 100sqm 3 sample for core cutting test should be taken
v  Electrical conduits shall not run in column
v  Earth Work Excavation for basement above 3m should be stepped form
v  Any back filling shall be compacted 95 % of dry density at the optimum moisture content and in layers not more than 200mm for filling above structure and 300mm for no structure.
v   F soling is specified the soling stones shall be laid at 45 degree to 60 degree inclination (and not vertical) with interstices filled with sand or moorum.
v  A set of cube tests shall be carried out for each 30 cum of concrete/each levels of casting /each batch of cement.
v  Water cement ratio for different grades of concrete shall not exceed 0.45 for M20 and above and 0.50 for M10/M15 contractor.
v    For concrete grades M20 and above approved admixture shall be used as per mix design requirements.
v  Cement shall be stored in dry places on a raised platform about 200mm above floor levek and 300mm away from walls.3 cubes each at 7 days and 28 days shall be tested for compressive strength. The test results  should be submitted to engineer for approval.If results are unsatisfactory necessary action/rectification/remedial measures has to be exercised.
Cement Shall be tested for its Setting.
·         The Initial setting time shall not be less than 30 minutes,
·         The Final Setting time shall not be more than 10 Hours.
Slump as Per IS 456
§  Lightly reinforced 25-75mm
§  Heavily reinforced 75-100mm
§  Trench fill (Insitu & termite) 100-150mm (for tremie no need of vibrator)
Curing Days Required:
Super Sulphate Cement: 7 Days
Ordinary Portland cement OPC:10 Days
Minerals and admixture added cement:14 Days
Cube Samples:
1 – 5 M3 :1 No
6- 15M3 :2 No’s
16-30 M3 : 3 No’s
31-50 M3 : 4 No’s
Above 50 M3:4+1 No of addition sample for each 50 M3

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