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a)tell density of steel , concrete, bricks , sand and
aggregates.? b) what is knife test for wooden doors ? c)
what is the meaning of term abrasion? what is tested in it?
d) why pile foundation is provided in BCS?e) By total
station what activities can be performed and on what
principle it works? f) what is creep?
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Answer Posted / amoo abiodun
steel 7769kg/m^3, concrete 2400kg/m^3, bricks 1794kg/m^3,
sand 1600kg/m^3, aggregates 1922kg/m^3,
abrasion is wearing down or rubbing away by means of friction.
test in abrasion is loss of material through 1.7mm sieve.
pile foundation is use in bcs because of the mineral (montmorillonite)which has extensive shrinkage and swelling.
total station is use in measurement of horizontal, vertical angle, and slope distance. it work with principle of electic distance, measuement which based on measuring the difference between transmitted and reflected waves.
Creep when load act on a structural member stain develops that produces both compressive and tensile stresses. tensile stresses are resisted by steel and concrete takes all the compressive stresses.
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