Characteristics Of Materials And Concrete Testing Flashcards
1
Q
How long in days after water is added to a mix is the comprehensive strength determined?
A
28 days!
2
Q
In reinforced concrete construction the inclusion of the reinforcing bar (rebar) is primarily to resist what sort of building forces?
A
Tensile forces
3
Q
How many blows and how many layers is the British standard slump test?
Blows?
Layers?
A
25 blows
3 layers
4
Q
What percentage of strength is lost in a fresh batch (mix) of concrete for every 1% increase in air added to the mix?
A
5%
5
Q
Why is concrete considered harmful to the environment?
A
Harmful co2 emissions when manufacturing concrete
Dust and noise pollution when using concrete
