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What are the two types of classifications for aggregates and give and example of each?
Natural (Sand), Artificial (Blast Furnace Slag)
What are the three types of rocks and provide a definition for each?
Igneous: Cooling of molten rock (Granite) Sedimentary: Deposition and consolidation of particles (sandstone) Metamorphic: Formed by pressure and head (marble)
What are the desirable characteristics of aggregates
Durable, chemically inert, free of impurities
What are the three types of classifications for aggregates (think boxing)
Heavyweight, Normal weight, Lightweight
How do we determine aggregate durability?
1. Field testing of conrete 2. Evaluating aggregates in concrete 3. Evaluating aggregates alone
What is unsoundness?
An aggregate is unsound if its volume changes due to environmental changes that lead to cracking in concrete.
What are the functions of an aggregate?
Economy (Cheap Filler), Dimensional Stability (Shrinking and Expansion Control), Durability (Protection from chemical attacks)
How is an aggregate deemed to be NOT chemically resistant?
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.
What factors guide the implementation of waste materials as aggregates?
1. Economy 2. Compatibility with other materials 3. Concrete properties 4. Consistency
Recycled concrete can be used as an aggregate as long as its hydrated. True or False
False, needs to be dehydrated to separate paste and aggregates. \#
Which type of rock tends to shrink the most?
What are the two forms of freeze-thaw deterioration due to aggregate unsoundness?
Pop-outs and D-cracking
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