properties of concretequiz

Properties of Portland cement

LISA (Limestone, iron ore, silicia, aluminite)

Properties of concrete

Portland Cement, concrete sand, aggregate/gravel

Water to concrete ratio

.45 or ~1/2 of cement

Admixtures

Any additional property added outside the standard concrete formula (dye, air, retarder

Clinker

Raw material of cement before its crushed

Tensile strength

Ability to bend

Does concrete have tensile strength?

No, but rebar gives it tensile strength

What kind of water must be used for concrete?

Cool and potable

What can you use instead of rebar if the specifications allow it?

Fiberfill

When is the maximum strength of concrete?

28 days after pour

Average psi for standard concrete?

3000-6000 psi

Cement 1

Used for all purposes

Cement 2

Used if hot to slow curing time

Cement 3

Used if it’s cold outside to speed curing time

Cement 4

Used for very large pours

Cement 5

Used if high sulfates in ground(nuclear power plants)

What percentage of concrete is aggregates?

60-80%

Concrete weight per cubic foot

130-160 lbs

Light weight aggregate concrete weight per cubic foot

85-130 lbs

Chemical reaction in concrete from cement and water

Hydration

Benefits of air as admixture

Increased durability against freeze and thaw

What is bleed

Water rising to the top surface of the concrete

What happens with incorrect water ratios in concrete

Reduced strength

Do large aggregates reduce workability?

Yes

Benefits of light weight aggregates in concrete

Reduced dead loads

Concrete is only as strong as what?

As the aggregates that are in it

Is it better or worse to have the same size aggregates in the concrete instead of a blend?

Worse, same size produces weaker concrete

Are sieve openings liner or sq inches

linear

What fall do gutters have?

2%

Curb and gutter width?

Curb - 6 inches, gutter 18 inches .