Mix Design of Concrete and Properties of Green Concrete Level: B.E. Concrete Technology
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RCC-Conc Objective
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(OBJECTIVE QUESTION) DESIGN OF CONCRETE (UNIT-1) (OBJECTIVE QUESTION) 1) Factor of safety for a) Steel should be based on its yield stress b) Concrete should be based on its ultimate stress c)both a and b d) None of these 2) Prestressing losses in post-tensioned and pre-tensioned beams are respectively a) 15% and 20% b) 20% and 15% C) 15% and 15% d) 20% and 20% 3) I n symmetrically reinforced sections shrinkage stresses in concrete and steel are respectively a) Compressive and tensile b) Tensile and compressive c) Both compressive d) Both tensile
Master your semester with Scribd 4) The theoretical failure load of the beam for attainment of limit stateFree of collapse in flexure is Read Foron 30this Days Sign up to vote title & The New York Times Useful Not useful a) 23.7kn Special offer for students: Only $4.99/month. b) 25.6kn
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6) What is the value of minimum reinforcement in a slab a) 0.1% b) 0.12% c) 0.15% d) 0.2% 7) What is the value of flexural strength of % M25 concrete a) 4.0Mpa b) 3.5Mpa c) 3.0Mpa 4)1.75Mpa 8) What should be the minimum g rade of reinforced concrete in and around sea cost construction? a) M35 b) M30 c) M25 d) M20 9) Doubly reinforced beams are recommended when a) Depth of the beam is restricted
Master your with Scribd b) Breadthsemester of the beam is restricted & The New Times c) BothYork depth and breadth are restricted Special offer for students: Only $4.99/month. d) Shear is high
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RCC-Conc Objective
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c) Upper bound solution d) Unique solution 12) Shear span is defined as the zone where a) Bending moment is zero b) Shear force is zero c) Shear force is constant d) Bending moment is constant 13) Deflection can be controlled by using appropriate a) Aspect ratio b) Modular ratio c)span/depth ratio d) water/cement ratio 14) In limit state approach spacing o f main reinforcement controls primarily
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a) Collapse
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b) Cracking c) Deflection
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d) Durability
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RCC-Conc Objective
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17) In a load balanced prestressed concrete beam under self load the cross-section is subjected to a) Axial stress b) Bending stress c) Axial and bending stress d) Axial and shear stress 18) A reinforced concrete slab is 75mm thick the maximum size of reinforcement bar can be used is a) 12mm diameter b) 10mm diameter C) 8mm diameter d) 6mm diameter 19) Maximum spacing of vertical reinforcement in RCC wall should not exceed a) The thickness of wall b) 1.5 times the thickness of wall c) 2 times the thickness of wall
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d)3 times the thickness of wall
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20) Ratio of the diameter of reinforcing bars and the slab thickness is a) 1/4
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RCC-Conc Objective
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b)small creep and shrinkage c)more bond d)all of these 3)The entrained air in concrete a)increase workability b)decrease workability c)increase strength d)none of these 4)Separation of ingredients from concrete during transportation is called a)Bleeding b)Creep c)Segregation d)Shrinkage
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5)For making impermeable concrete the process contains
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a)through mixing b)proper compaction
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c)proper curing
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RCC-Conc Objective
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8)Workability of concrete can be improved by addi tion a)Iron b)Sodium c)Zinc d)Sulphur 9)Split strength of concrete can be determined by a)Brazilion b)Vicat apparatus c)Cube test d)Briquettes test 10)Workability of concrete can be improved by a)more sand b)more cement c)more fine aggregate
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d)fineness of coarse aggregate
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11)Workability of concrete is directly proportional to a)grading of the aggregate
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RCC-Conc Objective
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c)aggregate ratio d)cement aggregate ratio 14)Poissons ratio for concrete ranges between a)0.10-0.15 b)0.15-0.25 c)0.25-0.30 d)0.30-0.35 15)Fineness modulus of aggregate is between 1)2-3.5 2)3.5-5.0 c)5-6.0 d)6-7.5 16)If slump of concrete mix is 60 mm,then its workability is
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d)very high
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RCC-Conc Objective
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a)elastic strain b)time of loading c)duration of loading d)moisture content 20)Expansion joints are provided if length of the concrete exceeds a)20m b)45m c)60m d)75m
BEHAVIOUR OF RC BEA M IN SHEAR (UNIT-3) 1) Prestressing losses in post-tensioned and pre-tensioned beams are respectively a) 15% and 20% b) 20% and 15%
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C) 15% and 15% d) 20% and 20%
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2) I n symmetrically reinforced sections shrinkage stresses in concrete and steel are respectively
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RCC-Conc Objective
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a)23.7kn b)25.6kn c)28.7kn d)31.6kn 5) )If compaction factor is 0.95,then workability of concrete is a)very low b)low c)medium d)high 6)Reduction coefficient of a reinforced concrete column with an effective length of 4.8m and size 250*300mm is a)0.80 b)0.85 c)0.90
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d)0.95
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7) Fineness modulus of aggregate is between Download With Free Trial 1)2-3.5 2)3.5-5.0 Master your semester with Scribd c)5-6.0 & The New York Times
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RCC-Conc Objective
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c)will cause dampness d)all of these 10)With rise in temperature of atmospheric air,setting time of cement a)increases b)decreases c)remains affected d)none of these 11)Main object of compaction of concrete is a)eliminate air holes b)achieve maximum density c)get intimate contact between concrete and embedded material d)all of these 12) Strength and quality of concrete depends on
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a)aggregate shape
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b)aggregate grading c)surface area of the aggregate
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d)all of these
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RCC-Conc Objective
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a)segregation b)lower density c)weakness of concrete d)all of these 16)Minimum water cement ratio required for full hydration of cement is a)0.18 b)0.36 c)0.54 d)0.60 17)Steam curing is not used with a)ordinary Portland cement b)rapid hardening cement c)high alumina cement d)all of these
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18)In case of hand mixing of concrete,extra cement is to be added a)5%
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b)10%
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RCC-Conc Objective
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d) Bending moment is constant
Design of one way and two w ay solid sl abs (unit-4) 1)Maximum permissible unit of magnesia concentration in ordinary po rtland cement is a)2% b)4% c)6% d)8% 2)Normal consistency of Portland cement is about a)50% b)30% c)25% d)15% 3)When water is added to cement
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a)heat is generated b)heat is absorbed
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c)chemical reaction is started
Master your semester d)impurities is washed out with Scribd Read Free Foron 30this Days Sign up to vote title & The New Yorkcoefficient Times Not of useful 4) )Reduction of a reinforced concrete column with an Useful effective length 4.8m and size is $4.99/month. Special offer for250*300mm students: Only
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d) 1500mm 6) Yield line theory results in a) Elastic solution b) Lower bound solution c) Upper bound solution d) Unique solution 7) Shear span is defined as the zone where a) Bending moment is zero b) Shear force is zero c) Shear force is constant d) Bending moment is constant 8) Deflection can be controlled by using appropriate a) Aspect ratio b) Modular ratio
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c)span/depth ratio d) water/cement ratio
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9) In limit state approach spacing of main reinforcement controls primarily
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b)diagonal crack due to compression c)diagonal crack due to tension d)shear crack 12)Sum of nodal forces at any yield line intersection in a slab is a)zero b)infinity c)independent of the reinforcement d)indeterminate 13)If sea water will use for preparing concrete i t a)will cause efflorescence b)may corrode the reinforcement c)will cause dampness d)all of these
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a)increases b)decreases
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c)remains affected
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17)The lower water cement ratio in concrete produces a)more density b)small creep and shrinkage c)more bond d)all of these 18)The entrained air in concrete a)increase workability b)decrease workability c)increase strength d)decrease strength 19)Too wet concrete may cause a)segregation b)lower density c)weakness of concrete
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d)all of these
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20)An axially loaded column is of 300*300mm size,Effective length of column is 3m.what is the minim eccentricity of the axial load for the column a)0 Master your semester with Scribd b)10 & The New York Times
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2)Fineness of cement is tested by a)Le-chatelier apparatus b)Sieve-analysis c)Vicat,s needle d)Specific surface air permeability method 3)Soundness test of cement is indicated by i ts soundness gives unsoundness due to a)free lime only b)magnesium only c)both a and b d)none of these 4)Maximum permissible unit of magnesia concentration in ordinary Portland cement is a)2% b)4% c)6%
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d)8% 5)Specific gravity of portland cement is
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c)voids d)less compaction 8)If angularity number of a aggregate is increased then workability of concrete will a)increase b)decrease c)no change d)none of these 9)Sieve number used in the fineness modulus test of cement is a)1 b)5 c)7 d)9 10)The theoretical failure load of the beam for attainment
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Of limit state of collapse in flexure is
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d)0.95 13) Fineness modulus of aggregate is between 1)2-3.5 2)3.5-5.0 c)5-6.0 d)6-7.5 14)Sum of nodal forces at any yield line intersection in a slab is a)zero b)infinity c)independent of the reinforcement d)indeterminate 15)If sea water will use for preparing concrete i t a)will cause efflorescence b)may corrode the reinforcement
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c)will cause dampness d)all of these
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16)With rise in temperature of atmospheric air,setting time of cement
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b)0.87 c)0.92 d)0.95 3
19)Relation between strength of concrete (s) in kg/m and get space ratio(x) is given by a)S=600x 2
b)S=1200x
3
c)S=2400x
d)none of these 20)Strength of concrete decreases a)if w/c ratio is less than 0.38 b)if w/c ratio is less than 0.6 c)with entrapped air d)if cement is increased
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RCC-Conc Objective
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12) What do you mean by equivalent concrete area of a reinforced concrete member? 13) What are the basic assumptions i n the analysis of reinforced concrete members? 14) A 300mm*300mm R.C. member reinforced with 2032mm square of steel supports an axial compression load of 750kn.calculate the stresses in concrete and steel. Take m=18
15) A 400mm*400mm R.C. member has to support an axial compressive load of 425kn.if the stress i concrete is not to exceed 4N/mm square. Calculate the area of steel required. Take m=18 16) Describe about compacting factor test. 17) Describe about workability of concrete. 18) Describe about buckling of sand. 19) The cross section of a singly reinforced concrete beam is 300mm wide and 500mm deep to the centre of the tension reinforcement which consists of four bars of 16mm diameter. if the stresses in 2 2 concrete and steel are not to e xceed 7N/mm and 140N/mm respectively. Determine the moment of resistance of the beam. Take m=13.33
20)Find the percentage of tensile reinforcement necessary for a singly reinforced balanced rectangu 2 section if the permissible stresses in concrete and steel are c and t Newton/mm respectively and the modular ratio is m.
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1)A doubly reinforced rectangular beam is 300mm wide and 500mm deep to the centre of tension st is reinforced with four bars of 18mm diameter as compressive steel at an effective cover of 40mm an Download With Free Trial with four bars of 20mm diameter as tensile steel.i f the stresses in concrete and steel are not to the 2 2 exceed 7n/mm and 230n/mm respectively,find the moment of resistance of the section.Take m=13. adopt revised elastic theory
Master your semester with Scribd Read Free For 30this Days 2)A doubly reinforced rectangular beam is 300mm wide and 500mm deep to on the centre Sign up to vote title of tension st is reinforced withTimes four bars of 20mm diameter as compressive steel at an effective cover of 40mm an & The New York Useful Not useful
Cancel anytime. four bars of 25mm diameter as tensile steel.i f the stresses in concrete and steel are not to the Special offer forwith students: Only 2$4.99/month. 2 exceed 7n/mm and 230n/mm respectively,find the moment of resistance of the section.Take m=13.
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exceed 7n/mm and 230n/mm respectively,find the moment of resistance of the section.Take m=13. adopt revised elastic theory
8)A singly reinforced beam 250mm wide and 380mm deep to the centre of reinforcement is reinforce with 3 bars of 18mm diameter.Determine the depth of netural axis and the maximum stress in concre 2. when the stress in steel is 150N/mm Take m=13.33
9)Find the permissible of tensile reinforcement necessary for a singly reinforced balanced rectangula 2 section if the permissible stresses in concrete and steel are c and t Newton/mm respectively and the modular ratio is m. 10)Describe the analysis of a doubly reinforced section-conventional elastic theory 11)What are the effect of reinforcement in concrete 12)Describe about over reinforced section
13)Design a singly reinforced beam section subjected to a maximum bending moment of 55.35knm width of the beam may be made two third the effective depth.Use M20 anf Fe415 steel.
14)A singly reinforced beam 300mm wide and 450mm deep to the centre of reinforcement is reinforc with 4 bars of 16mm diameter.Determine the depth of netural axis and the maximum stress in concre 2. when the stress in steel is 150N/mm Take m=13.33
You're Reading a Preview 15) The cross section of a singly reinforced concrete beam is 300mm wide and 500mm deep to the centre of the tension reinforcement which consists of four bars of 16mm diameter. if the stresses in Unlock2full access with a 2free trial. concrete and steel are not to e xceed 7N/mm and 140N/mm respectively. Determine the moment of resistance of the beam. Take m=13.33 Download With Free Trial
16)Find the percentage of tensile reinforcement necessary for a singly reinforced balanced rectangu 2 section if the permissible stresses in concrete and steel are c and t Newton/mm respectively and the modular ratio is m. Read Free Foron 30this Days Sign up toconcrete vote title 17)Fine the moment of resistance of the beam section ,safe stresses in and steel are7N/m 2 and 230N/mm Take m=13.33 Useful Not useful
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Special offer for students: Only $4.99/month. 18)The beam section is subjected to a bending moment of 150kNm.Determine the maximum compre
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4)Abeam 200mm wide ,500mm effective depth and 6 metres span supports a total load of 190,500 Newtons including its weight.Find the maximum shear stress and determine the spacing of 10mm sti 2 by conventional method,Allowable shear stress is 0.50N/mm 5)Describe about lattice girder effect(Truss theory) 6) Whatis the revised theory recommended by the I.S.CODE?
7)A reinforced concrete section is subjected to a bending moment of 150KNm which may be positive 2 2 negative. if the permissible stresses in concrete and steel are 7N/mm and 230N/mm and m=13.33 .design the section 8) Whatare the recommendations development lengths? 9) Describe the necessity of bending reinforcement 10) Describe about Bond (Detailed examples with limit state design method)
11)A beam 300mm wide and 500mm effective deep of 5m span supports a total load of 20000N inclu its weight. Determine the maximum shear stress in concrete and the spacing of 10mm diameter stirru 2 2 2 by conventional method .Allowable shear stress is 0.50 N/mm .Take c=7N/mm .t=230N/mm ,a=0.90 12) What do you mean by equivalent concrete area of a reinforced concrete member? 13) What are the basic assumptions i n You're the analysis of reinforced concrete members? Reading a Preview 14) A 300mm*300mm R.C. member reinforced 2032mm square Unlock fullwith access with a free trial. of steel supports an axial compression load of 750kn.calculate the stresses in concrete and steel. Take m=18
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15) Describe about shear distribution in a beam of rectangular section. 16) What are the concept of Equivalent Shear and Moments?
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Special offer for students: Only $4.99/month. 18) The cross section of a singly reinforced concrete beam is 300mm wide and 500mm deep to the
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3)What are the steps to be followed in the design of a one way slab. 4)Design a simply supported slab supported on masonary walls to the following requirements a)Clear span=3m 2
b)Live load=4000N/m
c)Use M20 concrete and Fe 415 steel 5)Discuss about slab carrying concentrated load. 6)Discuss about two way slabs(slabs spanning in two directions) 7)Discuss about Rankine-Grashoff Theory. 8)Discuss about Two way slabs with corners held down (Marcus correction) 9)Analysis of two way slabs by I.S.CODE
10)Design a slab over a room 4m*6m as per I.S.code.The edges of the slab are simply supported an 2 corners are not held down.The live load on the slab is 3000N/m .The slab has a bearing of 150mm o supporting walls.Use M20 concrete and Fe 415 steel. 11)Design a simply supported slab supported on masonary walls to the following requirements
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12)Discuss about disposition of reinforcement.
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DESIGN OF CONCRETE (UNIT 5) 1)Discuss about Transverse reinforcement. 2)What are recommendation regarding longitudinal reinforcement.
3)Discuss about Axially loaded short columns.
4)A short R.C.C columns 400mm*400mm is provide with 8 bars of 16mm di ameter.If the effective len of the column is 2.25m.find the ultimate load for the column.Use M20 concrete and Fe 415 steel.
5)Find the area of steel required for a short reinforced concrete column 400mm*425mm to carry an a load of 1195kn.Use M20 concrete and Fe 415 steel. 6)Analysis and design of axially loaded columns by the use of charts.
7)Determine the safe axial load for a short column 450mmm in diameter ,Reinforced with 6 bars of 2 diameter.it is provided with 8mm diameter helical reinforcement at a high of 45mm.Use M20 concret Fe 415 steel 8)Discuss about combined axial load and uniaxial bending .
9)Areinforced concrete column section is 250mm*400mm is provided with reinforcement as given.Ta xu =550mm,find pu and MU .Use M15 concrete and Fe415 steel.
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10)Discuss about Axial load and Biaxial Bending.
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11)Design a short columns subjected to biaxial bending to the following particulars a)Size of the column=400mm*400mm Download With Free Trial b)Factored load=1200kn c)Factored moment=85kn with Scribd Master your semester d)Use M20 concrete and Fe415 steel & The New York Times
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20)Determine the safe axial load for a short column 350mmm in diameter ,Reinforced with 8 bars of 20mm diameter.it is provided with 8mm diameter helical reinforcement at a high of 45mm.Use M20 concrete and Fe 415 steel
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