Following are the important point must to remember for every civil engineer at site
➤Minimum thickness of slab is 125 mm.
➤Water absorption should not be more than 15 %.
➤Dimension tolerance for cubes + – 2 mm.
➤Compressive strength of Bricks is 3.5 N /mm2
➤Maximum Free fall of concrete allowed is 1.50 m.
➤In soil filling as per IS code for every 100 sqm 3 sample for
core cutting test should be taken.
➤Electrical conduits shall not run in column
➤Earth work excavation for basement above 3 m should be
stepped form.
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 300 mm for no structure
➤A set of cube tests shall be carried out for each 30 cum of
concrete / each levels of casting / each batch of cement.
➤Water cement ratio for different grades of concrete shall not
exceed 0.45 for M20 and above and 0.50 For M10 / M15 contractor
➤For concrete grades M20 and above approved admixture shall be
used as per mix design requirements.
➤Cement shall be stored in dry places on a raised platform
about 200mm above floor level and 300mm away from walls. Bags to be stacked not
more than 10 bags high in such a manner that it is adequately protected from
moisture and contamination.
➤Samples from fresh concrete shall be taken and at least a set
of 6 cubes of 150mm shall be prepared and cured. 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.
➤Water used for both mixing and curing shall be clean and free
from injurious amounts of oils, acids, alkalies, salts, sugar and organic
materials or other substances that may be deleterious to concrete or steel. The
ph shall be generally between 6 and 8.
➤Cement shall be tested for its setting.
1. The initial setting time shall not be less than 30
minutes.
2. The final setting time shall not be more than 10 hours.
➤Slump IS 456
Lightly reinforced 25 – 75 mm
Heavily reinforced 75 – 100 mm
Trench fill (insitu & Tremie) 100 – 150 mm (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
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