Con 151 Study Guide Exam Questions Answered Correctly.
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Module
CON 151
Institution
CON 151
concrete has high tensile strength - Answer Flase. It is low
strength vs durability - Answer ability to test alone vs weathering
concrete design strength is tested at what age? - Answer 28 days, the design standard time
what are two mix design strategies to increase concrete durab...
Con 151 Study Guide Exam Questions
Answered Correctly.
concrete has high tensile strength - Answer Flase. It is low
strength vs durability - Answer ability to test alone vs weathering
concrete design strength is tested at what age? - Answer 28 days, the design standard time
what are two mix design strategies to increase concrete durability - Answer increase aggregate
low water cement ratio
adding more water to concrete will _____ but will definitely decrease its ____ (concrete properties) -
Answer workability
strength
adding more concrete will make the mixture stronger and more durable - Answer False, cement
shrinks, the more it cracks which is bad
increasing the air content of the concrete can increase its _____ but will defiantly decrease its_____
(concrete properties) - Answer workability
strength
The maximum aggeregate size of concrete mix is chosen more constructibility reasons rather than mix
design related reasons - Answer true
what is wrong is concrete has dry crusty like in it?
how to prevent it?
, what caused it? - Answer -freeze thaw damage
-durability issue, bc they didn't add air with water
- add more air
what is wrong when concrete has big pieces apart within the mixture?
how to prevent it?
what caused it? - Answer - segregated aggregate
- use well graded aggregate
- not graded enough
what is the primary physical difference between type 1 and type 3 portland cement? - Answer smaller
particle size
what are two benefits of using a well graded aggregate blend - Answer - improve durability
- use less cement and still have more volume
what is the primary reason we add air to concrete - Answer prevent freeze thaw
give an example of a concrete admixture - Answer water reducer, accelerator
a water reducer will make concrete stiffer and decrease workability - Answer false, increase workability
strategies to make concrete more sustainable - Answer - less paste
- recycling water
What is the chemical reaction between cement and water that causes concrete to set and harden -
Answer hydration
what form of energy is released in in a hydration reaction? - Answer heath-> exothermic
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