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64 Cards in this Set
- Front
- Back
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Nominal mix upto |
M5 - M20 |
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Design mix |
From M25 |
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Different grade of concrete |
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Min. Grade of concrete of pcc for general construction |
Not less than m10 |
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Min. Grade of concrete of rcc for general construction |
Not less than m20 |
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Min. Grade of concrete of pcc with sea water |
Not less than m20 |
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Min. Grade of concrete of pcc with sea water |
Not less than M30 |
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Min. Grade of concrete for water tank , dome, roof shell |
Not less than m20 |
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Formula for fm ( mean strength) of concrete |
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The individual variation should not be more than _% of the average |
(+/-)15% |
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Value of standard deviations for different grade |
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Tamping rod Dia and length |
Dia - 16mm Length - 600mm |
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Then tensile strength of concrete is _% to _% of the characteristic strength of concrete |
10 to 15% |
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Split strength of concrete is? |
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Tensile strength of concrete due to bending Or flexural tensile strength of concrete or modulus of rupture ? |
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Modulus of elasticity ( short term) |
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Modulus of elasticity ( or long term modulus) |
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Creep coefficient for 7 days 28 days 1 year |
7 days - 2.2 28days - 1.6 1 year - 1.1 |
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Increase order of strength between split, rupture , and direct |
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Coefficient of thermal expansion of concrete and steel |
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Ph for construction water |
6 - 9 |
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Nominal size of aggregate |
20mm |
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Stress strain curve for hysd steel |
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Stress strain curve for concrete |
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Density of steel |
7850 kg/m3 |
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Specific gravity of steel |
7.850 |
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Poisson ratio of Steel and concrete |
Steel - 0.30 Concrete - 0.15 |
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Modulus of rigidity for steel or shear modulus |
0.769 × 10^5 MPa |
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Probability of failure |
0.0975 or 9.75% |
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Maximum compressive strain in bending |
0.0035 |
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Minimum strain of steel in bending |
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The strength of concrete structure __% less than standard cube strength by effect of slender and size effect |
33% |
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Design Compressive strength of concrete structure is |
0.45fck |
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Design strength of steel |
0.87fy |
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Average compressive stress |
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Average tensile force |
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Lever arm in bending |
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Moment of resistance (both) |
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Actual neutral axis (Xu) |
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Xumax for different grade of steel |
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Under reinforced section is more deeper or stiffer? |
It is more deeper |
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Over reinforced section is more deeper or stiffer |
It is more stiffer |
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In under reinforced section lever arm is greater or lesser than that of balanced section |
Is greater |
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Lever arm of over reinforced section is greater or lesser than balanced section |
Is lesser |
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Under reinforced section failure is by |
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Over reinforced section failure is by |
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Limiting % steel |
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Minimum area of tensile reinforcement |
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Maximum area of tensile reinforcement |
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If steel provided is greater than max.area of steel than it becomes |
Difficult in placing and compacting of concrete |
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If steel is less than min area of steel |
Then abrupt and sudden failure |
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Minimum cover based on structure ( Slab , beam, column footing) |
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Minimum cover based on environmental conditions |
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When is side face reinforcement given |
In case of deep beam With depth Greater than 750mm |
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Side face reinforcement is given ( in case torsion is acting) |
For deep beam with Depth Greater than 450mm |
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How much side reinforcement is provided |
Ast = 0.1% of gross area ( for rectangular beam) Ast = 0.1% of web area ( for i section beam) |
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Distribution of reinforcement on both side of side face reinforcement is ( equal or unequal) |
Equal distribution of reinforcement on both side |
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Crack width in concrete for different condition |
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Moment redistribution allowed only in which structure |
Indeterminate structure |
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Moment redistributed from higher level to lower level and redistribution allowed for Lsm and wsm is? |
Lsm - 30% Wsm - 15% |
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Min. Spacing for horizontal bar or distribution bar |
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Min. Spacing of vertical bar |
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Shear stress design by? |
Truss anology method |
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The max. Distance between expansion joint for concrete structure is |
45m |
