Non-uniform compaction may cause the concrete (a) porous (c) reduced strength (d) all the above (b) non-homogeneous
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A: Answer (a) increase (b) enhances (d) improves are correct option.
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A: G1=W1+W2+W3+W4 W1G1+W2G2+W3G3+W4G4W1,W2,W3,W4 can be in weight or percentages
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- Choose the correct answer One of the advantages of using concrete is. A-Low strength-to-weight ratio B-Volume instability C-Low maintenance. D-Low ductilityWhich type of aggregate is more harmful for using in concrete? Angular Rounded Rough ElongatedAnswer Options Correct Q.NO Question/Statement Answer A В D Plain cement concrete can able to 1 resist Bending Compression Shear Torsion 2 times the 3 times the 5 times the 10 times the Maximum spacing of the main bar in the slab is thickness of thickness of thickness of thickness of slab slab slab slab The minimum number of bars in rectangular 3 1 4 column is 4 Long column generally fails by Compression Tension Buckling Deflection The percentage of reinforcement in the pedestal column is 0.8% 0.15% 5.0% 6.0% A column is said to be reinforced concrete L12B column if The foundation is said to be deep 7 when DrB D=D D=0 The withdrawal of moisture content of the Increase in All answers Segregation Shrinkage foundation soil leads to volume are wrong
- Problem 3 If the moisture content of coarse aggregate is lower than the absorption, the water needs to be added to the concrete from the estimated water content. a)False b)True c)Not enough informationI need solve this question in concrete by ACI CODEOrganic impurities into the aggregate increase the strength and durability of concrete. Select one: O True O False
- Design the concrete mix according to the following conditions:Design Environment• Building beamo Required design strength = 27.6 MPao Minimum dimension = 150 mmo Minimum space between rebar = 40 mmo Minimum cover over rebar = 40 mmo Statistical data indicate a standard deviation of compressive strengthof 2.1 MPa is expected (more than 30 samples).• Only air entrainer is allowed.• Moderate Sulphate exposure.• Available Materialso Air entrainer:▪ Manufacture specification 6.3 mL/1% air/100 kg cement.o Coarse aggregate:▪ 19 mm nominal maximum size▪ River gravel (rounded)▪ Bulk oven-dry specific gravity = 2.55▪ Absorption = 3.6▪ Oven-dry rodded density = 1761 kg/m3▪ Moisture content = 2.5o Fine aggregate:▪ Natural sand▪ Bulk oven-dry specific gravity = 2.659▪ Absorption = 0.5▪ Moisture content = 2▪ Fineness modulus = 2.47o Cement▪ Type II (Moderate Sulphate Resistant)▪ Specific Gravity = 3.15Based on this information, find the following and summarize the findings in a table d) The amount…choose the correct option pleasestrength of concrete increased whenUsing higher w/c ratioReducing w/c ratioUsing higher cement contentUsing smooth aggregate48. The ratio of ingredient in M200 concrete is: A) 1:2:4 B) 1:1:2 C) 1:1-2 D) 1:3:6 18 The
- The concrete in the core of a spiral column is sub- jected to a uniform confining stress o, of 680 psi. What will the compressive strength o be? The un- confined uniaxial compressive strength is 5000 psi.Design the concrete mix according to the following conditions:Design Environment• Building beamo Required design strength = 27.6 MPao Minimum dimension = 150 mmo Minimum space between rebar = 40 mmo Minimum cover over rebar = 40 mmo Statistical data indicate a standard deviation of compressive strengthof 2.1 MPa is expected (more than 30 samples).• Only air entrainer is allowed.• Moderate Sulphate exposure.• Available Materialso Air entrainer:▪ Manufacture specification 6.3 mL/1% air/100 kg cement.o Coarse aggregate:▪ 19 mm nominal maximum size▪ River gravel (rounded)▪ Bulk oven-dry specific gravity = 2.55▪ Absorption = 3.6▪ Oven-dry rodded density = 1761 kg/m3▪ Moisture content = 2.5o Fine aggregate:▪ Natural sand▪ Bulk oven-dry specific gravity = 2.659▪ Absorption = 0.5▪ Moisture content = 2▪ Fineness modulus = 2.47o Cement▪ Type II (Moderate Sulphate Resistant)▪ Specific Gravity = 3.15Based on this information, find the following and summarize the findings in a table.a) Required…The grade of the concrete is M25. Find the values of design strength in- 1. Direct Compression. 2. Bending Compression & 3. Flexural Tension.