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.