Concrete Readings
_______________ is a mixture of sand, gravel, crushed rock, or other aggregates held together
in rocklike mass with a paste of cement and water - ANS-concrete
_________ are added to change certain characteristics of the concrete such as workability,
durability, and time of hardening - ANS-admixtures
concrete has a (high/low) compressive strength and a very (high/low) tensile strength -
ANS-high; low
____________ ____________ is a combination of concrete and steel wherein the steel
reinforcement provides the tensile strength lacking in concrete - ANS-reinforced concrete
in what type of structures can reinforced concrete be found? - ANS-bridges, buildings,
pavements, dams, retaining walls, tunnels, drainage, etc.
what are the advantages of reinforced concrete? - ANS-- compressive strength per unit cost
- resistance to fire and water
- very rigid
- low maintenance material
- in comparison to others, has a very long service life
- only economical material available for footings, floor slabs, basement walls, piers
- can be cast into a variety of shapes
- takes advantage of inexpensive local materials
- lower grade of skilled labor is required
the strength of concrete (decreases/increases) with time - ANS-increases
what are the disadvantages of reinforced concrete? - ANS-- low tensile strength
- forms are required to hold the concrete until it hardens sufficiently
- formwork is required which is very expensive
- low strength per unit weight of concrete leads to heavy members that are large
- properties vary widely because of variations in its proportioning and mixing
- placing and curing of concrete is not as carefully controlled
lightweight aggregates can be used to reduce concrete but the cost of the concrete is
__________ - ANS-increased
the romans made cement called _________ before the birth of Christ - ANS-pozzolana
the romans found large deposits of sandy volcanic ash near what famous dangerous volcano? -
ANS-Mt. Vesuvius
_______________ is a mixture of sand, gravel, crushed rock, or other aggregates held together
in rocklike mass with a paste of cement and water - ANS-concrete
_________ are added to change certain characteristics of the concrete such as workability,
durability, and time of hardening - ANS-admixtures
concrete has a (high/low) compressive strength and a very (high/low) tensile strength -
ANS-high; low
____________ ____________ is a combination of concrete and steel wherein the steel
reinforcement provides the tensile strength lacking in concrete - ANS-reinforced concrete
in what type of structures can reinforced concrete be found? - ANS-bridges, buildings,
pavements, dams, retaining walls, tunnels, drainage, etc.
what are the advantages of reinforced concrete? - ANS-- compressive strength per unit cost
- resistance to fire and water
- very rigid
- low maintenance material
- in comparison to others, has a very long service life
- only economical material available for footings, floor slabs, basement walls, piers
- can be cast into a variety of shapes
- takes advantage of inexpensive local materials
- lower grade of skilled labor is required
the strength of concrete (decreases/increases) with time - ANS-increases
what are the disadvantages of reinforced concrete? - ANS-- low tensile strength
- forms are required to hold the concrete until it hardens sufficiently
- formwork is required which is very expensive
- low strength per unit weight of concrete leads to heavy members that are large
- properties vary widely because of variations in its proportioning and mixing
- placing and curing of concrete is not as carefully controlled
lightweight aggregates can be used to reduce concrete but the cost of the concrete is
__________ - ANS-increased
the romans made cement called _________ before the birth of Christ - ANS-pozzolana
the romans found large deposits of sandy volcanic ash near what famous dangerous volcano? -
ANS-Mt. Vesuvius
