Which Division in the CSI does concrete belong? correct answers Division #3
What are the 5 basic characteristics of concrete? correct answers -Does not burn easily
-Can be used for many purposes
-Exterior finish=interior finish
-Great compression strength
-50+ years building
What is the c...
COSC 253 Final || with Errorless Solutions 100%.
Which Division in the CSI does concrete belong? correct answers Division #3
What are the 5 basic characteristics of concrete? correct answers -Does not burn easily
-Can be used for many purposes
-Exterior finish=interior finish
-Great compression strength
-50+ years building
What is the composition of concrete? correct answers Air
Portland cement
Coarse aggregate
Fine aggregate
Water
What is the term used when steel is embedded into the concrete? correct answers Reinforced
concrete
What does embedding steel into the concrete do? correct answers Increase tensile strength
When concrete cures, it gives off heat and forms bonds that hold the aggregate together. What is
this called? correct answers Heat of Hydration
What is the most commonly used ASTM? correct answers ASTM C150 - Portland Cement
What are the 5 Types of Portland Cement and their Classifications? correct answers Type I:
Normal
Type II: Moderate
Type III: High Early Strength
Type IV: Low Heat
Type V: Sulfate Resisting
What type of Portland Cement can be described as general-purpose Portland Cement suitable for
most uses when the special properties of other types are not required? correct answers Type I:
Normal
What type of Portland Cement takes 28 days to cure? correct answers Type I: Normal
What type of Portland Cement can be described as Portland Cement used where precaution
against Moderate Sulfate attack is important, as in drainage structures where Sulfate
Concentrations in groundwater are higher than normal correct answers Type II: Moderate
What type of Portland Cement can be described as Portland Cement used when high strengths
are desired at a very early time, usually a weak or less correct answers Type III: High Early
Strength
,What type of Portland Cement can be described as a special Portland Cement for use where the
amount and rate of heat generated during Hydration must be kept to a minimum correct answers
Type IV: Low Heat
What type of Portland Cement is intended for use in large masses of concrete? correct answers
Type IV: Low Heat
What type of Portland Cement can be described as special Portland Cement intended for use only
in construction exposed to severe Sulfate action, such as in some western states having soils and
waters of high Alkali content correct answers Type V: Sulfate Resisting
What does "A" represent after "Type"? correct answers Air Entraining
What is another name for a fine (small) aggregate? Smaller than ¼ correct answers Sand
What is another name for a coarse aggregate? Larger than ¼ correct answers Gravel or Crushed
Stone
In general, the maximum aggregate size should not be greater than __ of the clear spacing
between bars OR __ depth of the slab correct answers ¾, ⅓
Water reducing admixtures do what 3 things? correct answers Improve workability
Lower water content
Makes cement efficient
Retarder admixtures do what 3 things? correct answers concrete cures slower,can be applied to
surface of concrete , may act as water reducer
Accelerator admixtures do what 4 things? correct answers concrete cures faster, removes forms
early, load concrete sooner, permit work in cold weather
Air entraining agent admixtures do what 3 things? correct answers increase workability, insulate
concrete, uses slightly less water and aggregate
Can you add color to concrete? yes or no correct answers yes
___ means the concrete is formed and cured in a factory, transported to the construction site, and
erected as rigid components correct answers Precast
___ OR site cast means the concrete is formed and poured on the construction site. The concrete
mixture must be transported to the site or mixed at the site. correct answers Cast-in-Place
Out of Precast and Cast-in-Place methods, which requires formwork? correct answers Cast-in-
Place
,Who usually selects form liners? correct answers the Architects
Forms are made of what 3 materials? correct answers wood, metal, plastic
Formwork that is removed after the concrete has been poured and completed its hydration
process is... ? correct answers Temporary
Formwork that remains a part of the building structure after the concrete has been poured and
completed its hydration process is... ? correct answers Permanent
What is the name of the units that form the concrete and then remain in place permanently as
thermal insulation? correct answers Insulating Concrete Forms
What are Insulating Concrete Forms usually made out of? correct answers Styrofoam
A level surface of concrete that lies directly on the ground is known as... ? correct answers Slab
on Grade (SOG)
What are 6 factors of Formwork? correct answers potential failure of formwork
withstand pressure of heavy
maintain desired shape
maintain concrete moisture
most must be able to be removed
coated with wax/oil/plastic compound
Horizontal Boards - ___ correct answers Wales
Vertical Boards - ___ correct answers Cleats
Concrete is strong in ___ correct answers Compression
Steel is strong in ___ correct answers Tension
Reinforcing bars are either ___ or ___ correct answers plain, deformed
What is the purpose of deformations? A better ___ ___ with the concrete for more ___ ___
correct answers grip bond, surface area
What is designated by the size and spacing of the reinforcing bars used to make it? correct
answers Welded Wire Fabric
3 Reasons Accessories are Needed correct answers support rebar, tie rebar together, fastener
used to anchor other materials to the concrete
Where is reinforcing steel usually fabricated? correct answers in a mill or a shop
, What do you call a drawing or set of drawings produced by the contractor, supplier,
manufacturer, subcontractor, or fabricator? correct answers Shop Drawings
What are typically required for prefabricated components? correct answers Shop Drawings
Who approves shop drawings? correct answers the Engineers
All materials ___ and ___ with temperature change and, in buildings, materials move as the
building moves. correct answers expand, contract
Why do buildings move? 3 reasons. correct answers temperature change, soil settlements, wind
conditions
Where are the vulnerable areas of structure? correct answers foundation and corners
What determines the rate of movement due to temperature change? correct answers Thermal
Expansion
In order to prevent cracks in concrete, ___ need to be added correct answers Joints
Joints that create a physical space within the concrete (isolation/separation) correct answers
Expansion Joints
Joints that "score" the concrete - controlling where the cracks will occur correct answers Control
Joints
What 3 materials can joint inserts be made of? correct answers wood, vinyl, concrete
To ensure that the concrete mixture sets up properly the ___ to ___ ratio must be correct correct
answers water, cement
Too much water in a mixture will ___ the concrete correct answers weaken
There is a direct link between the ___ and ___ of concrete and its water-cement ratio correct
answers strength, durability
Who determines the compressive strength of concrete? correct answers the Engineer
What is the name of a concrete that is readily molded? correct answers Plastic
What test is used as a rough measure of the consistency of the concrete? correct answers Slump
Test
Does a slump test measure workability? yes or no correct answers no
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