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No-Fines Concrete is a lightweight concrete made without fine aggregates, offering advantages like reduced material requirements and lower density compared to conventional concrete. It features properties such as low segregation and lower shrinkage, while its strength increases over time. Fiber Reinforced Concrete (FRC) enhances the tensile strength and toughness of concrete, providing benefits like improved durability, reduced reinforcement needs, and better resistance to various stresses.

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Sophia Chin
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57 views2 pages

File 2

No-Fines Concrete is a lightweight concrete made without fine aggregates, offering advantages like reduced material requirements and lower density compared to conventional concrete. It features properties such as low segregation and lower shrinkage, while its strength increases over time. Fiber Reinforced Concrete (FRC) enhances the tensile strength and toughness of concrete, providing benefits like improved durability, reduced reinforcement needs, and better resistance to various stresses.

Uploaded by

Sophia Chin
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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FAQs

1. What is no fines concrete

 No-Fines Concrete is a method of producing light concrete by omitting the fines


from conventional concrete.
 No-fines concrete as the term implies, is a kind of concrete from which the fine
aggregate fraction has been omitted.
 This concrete is made up of only coarse aggregate, cement and water.
 Very often only single sized coarse aggregate, of size passing through 20 mm
retained on 10 mm is used.
 No-fines concrete is becoming popular because of some of the advantages it
possesses over the conventional concrete. The single sized aggregates make a
good no-fines concrete, which in addition to having large voids and hence light
in weight, also offers architecturally attractive look.

2. Discuss properties of No fines Concrete

 It does not segregate


 The density varies with the grading of aggregates
 Water cement ratio of this concrete varies from 0.38 to 0.52
 Its strength increases with time
 There is very little cohesiveness, necessitating longer duration of form work
removal.
 Shrinkage of this concrete is lower than normal concrete and its thermal
expansion is about 0.6 to 0.8 of normal concrete.

3. Some advantages of No fines Concrete

 Production of this type of concrete results in saving of material requirement. Due


to absence of fine aggregate or sand, less amount of cement is needed to
produce 1 m3 of no fines concrete.
 The density of this type of concrete is about 25 to 30% less than the conventional
concrete. Therefore it exerts less pressure on formwork
 Segregation property of this type of concrete is very low. Therefore it can be
dropped from considerable height without the danger of segregation.
 No special equipment is needed for compaction of this concrete. Full compaction
can be achieved by simple rodding operation.
4. What is Fibre reinforced concrete
 Plain Portland cement concrete is a brittle material. The strength of concrete in
tension is much lower than in compression. A growing tensile crack in plain
concrete can very soon lead to failure. In the presence of reinforcement, the
tensile load is transferred to the steel.

 An alternative to increasing the load carrying capacity of concrete in tension is


the addition of fibers. Well-dispersed fibers in the concrete act to bridge the
cracks that develop in concrete. The incorporation of fibers in a cement matrix
leads to an increase in the toughness and tensile strength, and an
improvement in the cracking and deformation characteristics of the resultant
concrete

5. Write about advantages of FRC

 Improve mix cohesion, improving pump ability over long distances


 Improve freeze-thaw resistance
 Improve resistance to explosive spilling in case of a severe fire
 Improve impact resistance– and abrasion–resistance
 Increase resistance to plastic shrinkage during curing
 Improve structural strength
 Reduce steel reinforcement requirements
 Improve ductility
 Reduce crack widths and control the crack widths tightly, thus improving
durability

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