C T: Uses of Ready Mix Concrete Unit 5 Part 3

Que5.10. What are the advantages and disadvantages of using fiber-corroborated concrete? 

Answer  Advantages of FRC Following are the advantages of FRC 

1. FRC possesses enough malleability to go under large distortion once the  peak cargo has been reached. 

2. Structure can be made into thin wastes or irregular shapes. 

3. Advanced flexural strength, depending on the addition rate. 

4. Greater retained durability in conventional concrete composites. 

5. fluently placed, cast,  scattered and lower labour ferocious than placing rebar. 

6. Ideal aspect rate which makes them excellent for early-age performance. 

7. Doesn’t rust nor erode and requires no minimal cover. 

8. High modulus of pliantness for effective long term underpinning, indeed in the hardened concrete. 

Disadvantages of FRC Following are the disadvantages of FRC 

1. High cost of accouterments. 

2. Greater reduction of plasticity. 

3. Generally  filaments don’t increase the flexural strength of concrete, and  so can not replace moment  defying or structural  sword  underpinning.  

Que5.11. Explain the mechanical  parcels of FRC as compared  to  corroborated concrete and structural  geste of FRC. 

Answer  Mechanical parcels of FRC Following are the mechanical   parcels of FRC 

1. Flexure The flexural strength was reported to be increased by2.5  times using 4 percent  filaments. 

2. Modulus of Pliantness Modulus of pliantness of FRC increases slightly  with an increase in the  filaments content. It was  set up that for each 1  percent increase in fiber content by volume, there’s an increase of 3  percent in the modulus of pliantness. 

3. Compressive Strength The presence of  filaments may alter the failure  mode of cylinders, but the fiber effect will be minor on the  enhancement  of compressive strength values( 0 to 15 percent). 

4. Impact Resistance The impact strength for stringy concrete is  generally 5 to 10 times that of plain concrete depending on the volume  of fiber. 

5. Fatigue Strength The addition of  filaments increases fatigue strength of  about 90 percent. 

6. Durability For FRC, durability is about 10 to 40 times that of plain  concrete.  7. unyoking Tensile Strength The presence of 3 percent fiber by  volume was reported to increase the splitting tensile strength of mortar  about2.5 times that of the unreinforced bone.  Structural  geste of FRC Fibres plays an important  part to   perfecting the structural  geste of concrete. Following are the  structural  geste of FRC 

1. High Strength Concrete filaments increases the rigidity of high strength  concrete. Fiber addition will help in controlling cracks and  diversions. 

2. Torsion  i. The use of  filaments eliminates the  unforeseen failure  specific of plain  concrete  shafts.  ii. It increases stiffness, torsional strength, rigidity, rotational capacity,  and the number of cracks with  lower crack  range. 

3. Flexure  i. The use of  filaments in  corroborated concrete flexure members increases  rigidity, tensile strength, moment capacity, and stiffness.  ii. The  filaments ameliorate crack control and  save post cracking structural  integrity of members. 

4. Cracking and deviation  Fiber  underpinning effectively controls cracking and  deviation, in  addition to strength  enhancement.  ii. In conventionally  corroborated concrete  shafts, fiber addition increases  stiffness, and reduces  deviation. 

5. Column  i. The increase of fiber content slightly increases the rigidity of axially  loaded  instance.   ii. The use of  filaments helps in reducing the explosive type failure for columns. 

6. Shear  Addition of  filaments increases shear capacity of  corroborated concrete  shafts  up to 100 percent.  ii. Addition of aimlessly distributed  filaments increases shear-  disunion strength  and ultimate strength 

Que5.12. Explain the use of fiber  corroborated concrete.

Answer  Following are the uses of fiber  corroborated concrete 

1. Runway, Aircraft Parking, and Pavements  i. For the same wheel  cargo FRC crossbeams could be about one half the consistence  of plain concrete arbor.  ii. FRC pavements offer good resistance indeed in severe and mild   surroundings.  iii. It can be used in runways, taxiways, aprons, blocks,  wharf areas, parking  and  lading ramps. 

2. Lair Filling and pitch Stabilization  sword fiber  corroborated concrete is used to line underground openings  and  gemstone  pitch stabilization.  ii. It eliminates the need for mesh  underpinning and scaffolding. 

3. heads and Hydraulic Structure FRC is being used for the  construction and  form of  heads and other hydraulic structures to  give  resistance to cavitation and severe  corrosion caused by the impact of large  debris. 

4. Thin Shell, Walls, Pipes, and Manholes i. Fibrous concrete permits the use of thinner flat and  twisted structural   rudiments.  ii. Steel stringy shotcrete is used in the construction of hemispherical   polls. 

5. Agriculture It’s used in beast  storehouse structures, walls, silos, paving, etc.  6. Precast Concrete and Products It’s used in architectural panels,   cock-up construction, walls, fencing, septic tanks, grease trap structures,  vaults and puppets. 

7. marketable It’s used for  surface and interior  bottoms, crossbeams and parking  areas,  highways,etc. 

8. storehouse/ Artificial It’s used in light to heavy duty loaded  bottoms. 

9. Domestic It includes  operation in driveways, sidewalks, pool  construction, basements, colored concrete, foundations, drainage,etc. 

Que5.13. Define ferro cement. What are the advantages and  disadvantages of ferro cement? 

Answer  Ferro Cement It’s a type of thin wall  corroborated concrete generally  constructed of hydraulic cement mortar  corroborated with  nearly spaced  layers of  nonstop and  fairly small size  line mesh. 

Advantages of Ferro- Cement 

1. Low  conservation costs. 

2. Good impermeability. 

3. Good fire resistance. 

4. veritably applicable for developing countries; labour  ferocious. 

5. Inflexibility in  slice, drilling and jointing. 

6. felicity forpre-casting.  7. 20 savings on accoutrements  and cost. 

8. It’s  largely  protean and can be formed into  nearly any shape for a wide  range of uses. 

9. Thin  rudiments and light structures, reduction in  tone weight and its  simple  ways bear a minimum of  professed labor. 

10. Reduction in  precious form work so frugality and speed can be achieved. 

11. Only a many simple hand tools are  demanded to  make any structures. 

12. Structures are  largely leakproof and advanced strength to weight  rate  thanR.C.C. 

Disadvantages of Ferro- Cement 

1. Tying rods and  snare together is especially tedious and time consuming. 

2. Large number of labours  needed. 

3. It’s  delicate to fasten to ferro cement with bolt, screw, welding and nail etc. 

4. erosion of the  buttressing material due to the deficient content of  essence by mortar. 

5. It can be punctured by collision with pointed objects. 

6. vulnerability to stress rupture failure. 

7. Low rigidity. 

8. Low shear strength.

Leave a Comment