Fiber Ratio and Reinforced Concrete Quiz

How does the angular shape of particles affect the properties of concrete?

The angular shape improves interlocking between particles, further enhancing the concrete's properties.

What is the percentage of aggregates that passed through the 90-micron sieve in the fineness of cement test?

6%

What is the maximum percentage of mass retained on 90 micron according to IS recommendations?

Less than 10%

What is the objective of the fineness of cement test?

To determine the fineness of cement. Signup and view all the answers

What apparatus is used to weigh the cement sample and residue in the fineness of cement test?

Analytical balance capable of reproducing results within 0.0002gm with an accuracy of ±0.0002 gm. Signup and view all the answers

What property of hair fibers makes them a promising candidate for enhancing the structural integrity of concrete?

Tensile strength and flexibility Signup and view all the answers

What is the name of the flask used in determining the specific gravity of cement?

Le chatelier flask. Signup and view all the answers

Why is hair considered a non-degradable matter, and how is it utilized in concrete?

Hair is non-degradable and creates environmental problems; it is used as a fibro reinforcing material to minimize waste and reinforce mortar. Signup and view all the answers

What are the primary benefits of using hair fibers in concrete, and how do they impact construction practices and environmental sustainability?

The primary benefits include improved resistance to cracking, increased durability, and ecological responsibility, leading to greener construction practices and reduced environmental impact. Signup and view all the answers

What is the objective of incorporating hair fibers in concrete, and how does it affect the workability and strength of concrete?

The objective is to determine workability, compressive strength, tensile strength, and reduction of spalling by adding human hair to concrete. Signup and view all the answers

How does the tensile strength of hair compare to that of copper wire, and what are the implications for its use in concrete reinforcement?

Hair has a tensile strength comparable to copper wire of similar diameter, making it a suitable reinforcing material for concrete. Signup and view all the answers

What is the definition of the ratio of the fiber, and how does its value vary for different fibers?

The ratio of the fiber is the ratio of its length to its diameter, and its value varies for different fibers. Signup and view all the answers

What are the key advantages of using hair as a reinforcing material in concrete, and how does it impact the environmental sustainability of construction projects?

Hair is abundant, low-cost, and non-degradable, making it an environmentally friendly and cost-effective option for concrete reinforcement. Signup and view all the answers

What is the condition required for efficient stress transfer from the matrix to the fiber, and why is it important?

The modulus of the elasticity of the matrix must be much less than the tough fiber, and this is important for efficient stress transfer. Signup and view all the answers

What are the characteristics of the hair thread structure, and how do they contribute to its mechanical resistance?

The hair thread has a cylindrical structure, is highly organized, and has a rigid structure at the molecular level, which provides flexibility and mechanical resistance. Signup and view all the answers

What percentage of water and proteins do human hairs typically consist of, and what are the other components?

Human hair typically consists of 32% water, 65-95% of its weight in proteins, lipid pigments, and other components. Signup and view all the answers

What are the benefits of using hair as a reinforcement agent for concrete, and what challenges does it address?

Using hair as a reinforcement agent for concrete offers a sustainable alternative to traditional materials and addresses the challenge of waste management. Signup and view all the answers

Why is a good bond between the matrix and the fiber important for improving the tensile strength of a composite material?

A good bond is important for improving tensile strength because it enables efficient stress transfer from the matrix to the fiber. Signup and view all the answers

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