Types of Aggregates in Concrete

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

What is the primary purpose of using Type IV (Low Heat Portland Cement)?

  • To reduce carbon emissions in moderate sulfate attack
  • To provide high sulfate resistance in concrete
  • To achieve high early strength in cold weather construction
  • To minimize temperature rise in massive structures (correct)

What is the primary characteristic of Type III (High-Early Strength Portland Cement)?

  • Low heat generation during setting
  • High sulfate resistance
  • High early strength soon after pouring (correct)
  • Moderate heat generation during hydration

Where would Type V (Sulfate Resistant Portland Cement) be used?

  • In massive structures such as dams
  • In cold weather construction
  • In structures with moderate sulfate attack
  • In areas with high sulfate concentrations in soil or groundwater (correct)

What is the common component among all types of Portland Cement?

<p>All of the above (D)</p> Signup and view all the answers

What is the primary advantage of Type IV (Low Heat Portland Cement) from an environmental perspective?

<p>Low carbon emission (B)</p> Signup and view all the answers

What is the primary difference between Type I (Ordinary Portland Cement) and Type II (Modified Portland Cement)?

<p>Moderate heat generation is desirable (D)</p> Signup and view all the answers

What is the primary reason for searching for alternative materials to natural sand?

<p>Due to the increasing difficulty in obtaining natural sand (A)</p> Signup and view all the answers

What type of sand is obtained from small streams near hills?

<p>Stream sand (D)</p> Signup and view all the answers

What is the characteristic of pit sand?

<p>Sharp and generally coarse (C)</p> Signup and view all the answers

What is the limitation of using sea sand in construction?

<p>It is not suitable for reinforced concrete works (B)</p> Signup and view all the answers

What is used to extract limestone from the ground?

<p>Explosives (C)</p> Signup and view all the answers

What is the characteristic of flaky aggregates?

<p>Their thickness is less than their length (D)</p> Signup and view all the answers

What is the primary advantage of using angular aggregate in high-strength concrete?

<p>It provides a good bond due to interlocking property (C)</p> Signup and view all the answers

What are the types of substances that are considered deleterious in aggregates?

<p>Organic matters, coatings such as clay, and soft materials (A)</p> Signup and view all the answers

What is the purpose of primary crushers in the cement-making process?

<p>To reduce the rock into fragments (C)</p> Signup and view all the answers

What do plant chemists analyze to determine the proportions of raw materials?

<p>The mineral content of the rock (B)</p> Signup and view all the answers

What type of sand contains a high percentage of dust and clay?

<p>Crushed stone sand (D)</p> Signup and view all the answers

Which type of aggregate is not recommended for concrete manufacturing?

<p>Flaky aggregate (B)</p> Signup and view all the answers

What is the temperature reached in the burning zone of the kiln?

<p>1650°C (C)</p> Signup and view all the answers

What happens to aggregates when washed with water containing impurities?

<p>They get coated with layers of silt, salts, and organic matters (A)</p> Signup and view all the answers

Why are elongated aggregates not preferred for concrete?

<p>They are liable to damage and can cause segregation (B)</p> Signup and view all the answers

What is the characteristic of aggregates with a rough surface texture?

<p>They provide a better bond with the cement paste (B)</p> Signup and view all the answers

What happens to the clinker after it is removed from the kiln?

<p>It is cooled for storage (D)</p> Signup and view all the answers

What is the term for aggregates that combine flaky and elongated particles?

<p>Flaky and Elongated aggregate (C)</p> Signup and view all the answers

What is the primary reason for limiting the amount of water in a concrete mix?

<p>To produce concrete of the required quality (B)</p> Signup and view all the answers

What is the characteristic of natural water that makes it acceptable for concrete mixes?

<p>It has no pronounced taste or odor (D)</p> Signup and view all the answers

What is the effect of excessive impurities in water on the concrete?

<p>It affects the setting time, strength, and durability of the concrete (C)</p> Signup and view all the answers

What happens to the materials as they roll and slide downward in the kiln?

<p>They become hot and incandescent (D)</p> Signup and view all the answers

What is the characteristic of water that makes it suitable for curing?

<p>It is fit for making concrete (C)</p> Signup and view all the answers

What is the result of using water with impurities for curing?

<p>It causes stains and discoloration (D)</p> Signup and view all the answers

Flashcards are hidden until you start studying

More Like This

Use Quizgecko on...
Browser
Browser