Which of the following is NOT a typical admixtures? correct answers Portland cement
What is the relationship between moisture and curing concrete? correct answers Concrete should be kept moist throughout the curing phase
Concrete correct answers made from the mixture of portland cement, water...
which of the following is not a typical admixtures
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COSC 253
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COSC 253 Exam 1 || with A+ Guaranteed Solutions.
Which of the following is NOT a typical admixtures? correct answers Portland cement
What is the relationship between moisture and curing concrete? correct answers Concrete should
be kept moist throughout the curing phase
Concrete correct answers made from the mixture of portland cement, water, fine aggregate
(sand), and coarse aggregate (gravel/crushed stone).
CSI (Construction Specifications Institute) correct answers Responsible for creating universal
guidelines. 3rd Division is concrete. 1st thing given is plans and specifications (which give
instructions and more information).
Romans correct answers Considered the inventors of concrete
Reinforced concrete correct answers term used when steel is embedded in the concrete. Concrete
and steel are combined for both compressive and contensular strength.
What does the steel do ? correct answers Steel helps to pick up for the contensular strength that
concrete lacks.
Heat of Hydration correct answers When concrete cures, it gives off heat and forms bonds that
hold the aggregate together.
Sustainable Design correct answers Concrete is reusable and is repurposed for the aggregate of a
concrete mix.
American society for testing materials (ASTM) correct answers Establishes standard
specifications for commonly used materials of construction.
ASTM C150 correct answers Types I, II, III, IV, V IA, IIA, IIIA (A = air entraining)
ASTM C94 correct answers Ready Mixed Concrete
3 Governing project ideas correct answers Money, Time, Quality
Air entraining concrete correct answers Signified by "A" -used for thermal resistance.
Large and Small aggregate correct answers MOST Economical.
TYPE I correct answers Normal
TYPE II correct answers Moderate
, TYPE III correct answers HIGH EARLY STRENGTH - used when facing time constraints.
Putting weight on the slab early in the building process.
TYPE IV correct answers LOW HEAT - Building high rise in Houston with limited space/low
ventilation - used low heat to not affect other buildings
TYPE V correct answers SULFATE RESISTING - Used in parking garages, industrial
applications
Concrete Reinforcement correct answers Reinforcement bars are based on 1/8". Every increment
represents 1/8." When needing more strength, they dont make diameters larger but instead they
add more bars
Chemical admixtures correct answers are the ingredients in concrete other than Portland cement,
water, and aggregate that are added to the mix immediately before or during mixing.
WATER-REDUCING ADMIXTURES correct answers REDUCE WATER CONTENT
LOWER WATER-CEMENT RATIO
HIGHER STRENGTH CONCRETE
RETARDING ADMIXTURES correct answers SLOW THE HEAT OF HYDRATION
KEEP CONCRETE WORKABLE
ACCELERATING ADMIXTURES correct answers INCREASES THE HEAT OF
HYDRATION
EARLY STRENGTH
REDUCE THE TIME
SUPERPLASTICIZERS correct answers FLOWING CONCRETE IS A HIGHLY FLUID
CAN BE PLACED WITH LITTLE VIBRATION
ONLY 30 TO 60 MINUTES
ADDED TO CONCRETE AT THE JOBSITE
Precast correct answers the concrete is formed and cured in a factory, transported to the
construction site and erected as rigid components. Requires formwork
Cast in place (site cast) correct answers the concrete is formed and poured on the construction
site. The concrete mixture must be transported to the site or mixed at the site. Requires formwork
(sidewalk, driveway, ICF, roads, pools)
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