Question

UHPC concrete (select the most appropriate answer)

1. can exhibit a compressive strength up to 500 MPa, which is greater than that of steel

2. can increase in strength substantially as a results of UV radiation from sun

3. can exhibit a K_IC > 200 MPa.m^1/2 which is much higher than that of steel

4. can have a high G_IC >> G_IC of steel and thus can high excellent impact properties useful in earth quake damage prevention

5. can exhibit a poisson's ratio ~ > 0.5 which is very useful in design

6. can exhibit color change from red during day and green at night

7. can have a high tensile strength almost close to that of steel (~250 MPa)

8. can exhibit a G" >> G' and thus have a rubbery transformation that can prevent rapid crack propagation

Answer 1

1.Ultra high performance concrete can exhibit more than 500 Mpa upto 800 Mpa when iron powder is used.270 Mpa using glass powder and 200 Mpa using mineral powders replacing coarse aggregate.