Question

plain crment concrete

Reinforced Cement Concrete

High Performance Concrete

Fiber Reinforced Concrete

for each type which range of strength it use?

Answer #1

(30 pts) A short reinforced concrete column is
subjected to a 1000 kN axial compressive load. The moduli of
elasticity of plain concrete and steel are 25 GPa and 207 GPa,
respectively, and the cross-sectional area of steel is 2% of that
of the reinforced concrete. Considering the column as a structural
member made of a composite material and subjected to load parallel
to the steel rebars, calculate the following:
a. the modulus of elasticity
of the reinforced concrete
b....

Since steel in our reinforced concrete bears most of the tensile
loads, why is it still important to know the tensile strength of
concrete? List one example or type of structure where tensile
strength might play a role in the performance or durability of a
concrete structure.

A continuous and aligned carbon fiber-reinforced composite
consists of 60% by volume of high-strength carbon
fibers having a tensile strength of 3.9 GPa reinforced in a
polyester resin that, when hardened, displays a tensile
strength of 50 MPa. What is the tensile strength of this composite
in the longitudinal direction?

Cement is one of the ingredients of concrete. Concrete is
produced in “ready-mixed concrete plants.” Few years ago, a new
type of cement entered the market. We want to find out what portion
of the ready-mixed concrete plants use this new cement. Assume that
there are 5,000 plants in the US. We select 100 plants and ask
their managers if they use the new cement. We find that 20 of them
use the new cement. For a confidence level of...

Cement is one of the ingredients of concrete. Concrete is
produced in “ready-mixed concrete plants.” Few years ago, a new
type of cement entered the market. We want to find out what portion
of the ready-mixed concrete plants use this new cement. Assume that
there are 5,000 plants in the US. We select 100 plants and ask
their managers if they use the new cement. We find that 20 of them
use the new cement. For a confidence level of...

Cement is one of the ingredients of concrete. Concrete is
produced in “ready-mixed concrete plants.” Few years ago, a new
type of cement entered the market. We want to find out what portion
of the ready-mixed concrete plants use this new cement. Assume that
there are 5,000 plants in the US. We select 100 plants and ask
their managers if they use the new cement. We find that 20 of them
use the new cement. For a confidence level of...

you need to prepare a concrete mix design for a mass concrete
element. if the cement type provided to you is Type 1 cement, which
supplementary cementation material (SCM) would you choose? give
reasons

A reinforced concrete column, 5.0 m high has a cross section
of 400 mm x 400 mm. it is reinforced by four steel bars each 20 mm
in diameter and carries a load of 1000 kN. Young’s modulus for
steel is 200,000 N/mm2 and for concrete is 15,000 N/mm2. Determine
the deformation in mm?
please show solution

A reinforced concrete beam is constructed with Grade 30 concrete
which has a cross section of 450 mm x 660 mm (b = 450 mm and D =
660 mm). The length of the beam is 5 m. The elastic modulus of the
concrete is 32.8 GPa. A uniformly distributed live load of 23 kN/m
is acting on the beam. Determine (a) the design bending moment on
this beam for strength limit state, (b) modular ratio assuming Es =
200...

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