High Strength Concrete (Grade M70 and above) has several distinguishing properties that separate it from normal strength concrete. Which of the following is NOT a characteristic of High Strength Concrete? 

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  1. High durability
  2. Reduced permeability
  3. Increased shrinkage
  4. Lower cement content

Answer (Detailed Solution Below)

Option 4 : Lower cement content
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Detailed Solution

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Explanation:

Characteristics of High Strength Concrete

High Strength Concrete (Grade M70 and above) possesses certain notable properties which distinguish it from normal strength concrete. These properties include:

  • High durability: This type of concrete has enhanced durability due to its dense microstructure and lower water-cement ratio.

  • Reduced permeability: The dense microstructure also results in lower permeability, making the concrete less susceptible to water ingress and chemical attacks.

  • Increased shrinkage: Despite its advantages, high strength concrete can experience increased shrinkage due to its lower water content and higher cementitious material content.

  • Lower cement content: This is not a characteristic of high strength concrete. In fact, higher grade concrete generally requires more cementitious materials to achieve the desired strength and durability.

Analyzing the Given Options

  1. "High durability" (Characteristic)

    • High strength concrete is known for its enhanced durability due to its dense microstructure and low porosity.

  2. "Reduced permeability" (Characteristic)

    • The dense microstructure of high strength concrete results in lower permeability, reducing the risk of water and chemical ingress.

  3. "Increased shrinkage" (Characteristic)

    • High strength concrete can experience increased shrinkage due to its lower water content and higher cementitious material content.

  4. "Lower cement content" (NOT a characteristic)

    • High strength concrete typically requires more cementitious materials to achieve the desired strength, making this statement incorrect.

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