Aggregates at McGill University | Flashcards & Summaries

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What are the two types of classifications for aggregates and give and example of each?

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Natural (Sand), Artificial (Blast Furnace Slag)

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What are the three types of rocks and provide a definition for each?

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Igneous: Cooling of molten rock (Granite) Sedimentary: Deposition and consolidation of particles (sandstone) Metamorphic: Formed by pressure and head (marble)

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What are the desirable characteristics of aggregates

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Durable, chemically inert, free of impurities

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What are the three types of classifications for aggregates (think boxing)

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Heavyweight, Normal weight, Lightweight

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How do we determine aggregate durability?

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1. Field testing of conrete 2. Evaluating aggregates in concrete 3. Evaluating aggregates alone

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What is unsoundness?

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An aggregate is unsound if its volume changes due to environmental changes that lead to cracking in concrete.

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What are the functions of an aggregate?

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Economy (Cheap Filler), Dimensional Stability (Shrinking and Expansion Control), Durability (Protection from chemical attacks)

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How is an aggregate deemed to be NOT chemically resistant?

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Issues is durability are often caused by an abundance in silica and alkalis in cement.Too much gypsum causes sulphate attacks, Pyrite EXPANDS with CH.

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TESTE DEIN WISSEN

What factors guide the implementation of waste materials as aggregates?

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1. Economy 2. Compatibility with other materials 3. Concrete properties 4. Consistency

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Recycled concrete can be used as an aggregate as long as its hydrated. True or False

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False, needs to be dehydrated to separate paste and aggregates. \#

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Which type of rock tends to shrink the most?

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Sedimentary

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What are the two forms of freeze-thaw deterioration due to aggregate unsoundness?

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Pop-outs and D-cracking

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Q:

What are the two types of classifications for aggregates and give and example of each?

A:

Natural (Sand), Artificial (Blast Furnace Slag)

Q:

What are the three types of rocks and provide a definition for each?

A:

Igneous: Cooling of molten rock (Granite) Sedimentary: Deposition and consolidation of particles (sandstone) Metamorphic: Formed by pressure and head (marble)

Q:

What are the desirable characteristics of aggregates

A:

Durable, chemically inert, free of impurities

Q:

What are the three types of classifications for aggregates (think boxing)

A:

Heavyweight, Normal weight, Lightweight

Q:

How do we determine aggregate durability?

A:

1. Field testing of conrete 2. Evaluating aggregates in concrete 3. Evaluating aggregates alone

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Q:

What is unsoundness?

A:

An aggregate is unsound if its volume changes due to environmental changes that lead to cracking in concrete.

Q:

What are the functions of an aggregate?

A:

Economy (Cheap Filler), Dimensional Stability (Shrinking and Expansion Control), Durability (Protection from chemical attacks)

Q:

How is an aggregate deemed to be NOT chemically resistant?

A:

Issues is durability are often caused by an abundance in silica and alkalis in cement.Too much gypsum causes sulphate attacks, Pyrite EXPANDS with CH.

Q:

What factors guide the implementation of waste materials as aggregates?

A:

1. Economy 2. Compatibility with other materials 3. Concrete properties 4. Consistency

Q:

Recycled concrete can be used as an aggregate as long as its hydrated. True or False

A:

False, needs to be dehydrated to separate paste and aggregates. \#

Q:

Which type of rock tends to shrink the most?

A:

Sedimentary

Q:

What are the two forms of freeze-thaw deterioration due to aggregate unsoundness?

A:

Pop-outs and D-cracking

Aggregates

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