Engineering, 28.04.2021 18:10 acoverupoze5th

A minimum compressive strength of at least 4500 psi, after 180 days of curing (aging) time, is specified for the concrete used in a bridge project. It is further specified that a water-cement ratio of 0.5, a slump of 1.5 inch, and an air entrainment of 4% be used. To provide a curing protocol that will produce the required compression strength, the concrete should be moist-cured and then cured: A. In air after 3 days B. In air after 7 days C. In air after 14 days D. A compressive strength of at least 4500 psi cannot be attained

Answers: 3

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.

Answers: 2

Answer

Engineering, 04.07.2019 18:10

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k

Answers: 2

Answer

Engineering, 04.07.2019 18:20

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)

Answers: 3

Answer

Engineering, 04.07.2019 19:10

Starting wih an energy balance on a rectangular volume element, derive the one- dimensional transient heat conduction equation for a plane wall with constant thermal conductivity and no heat generation.

Answers: 1

Answer

You know the right answer?

A minimum compressive strength of at least 4500 psi, after 180 days of curing (aging) time, is speci...

Questions