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Concrete mix with a 3 in slump, w/c ratio of .5, and sand with a fineness modulus of 2.4 contains 1700 lb of coarse aggregate.1. compute the required weight of the aggregate per cubic yard.2. the w/c ratio is reduced to .45. will the quantity of coarse aggregate increase, decrease, or stay the same?
If a 24' tall W 14 x 120 column has simple end connections, determine the maximum design compression strength of the column.
Colette Lake has a surface area of 103 ha and a mean depth of 8 m. The pH of the water is 7.6. The lake receives surface water from a lake upstream, rainfall, and diffuse groundwater input. Atmospheric inorganic N deposition is insignificant.
A hardwood beam of rectangular cross-section 150x300 is simply supported over a span of 8m, and is loaded as sketched. Determine the maximum deflection of the beam. (Youngs modulus E = 12 x 10^3 MPa)
Laboratories containing dangerous materials are often kept at a pressure slightly less than ambient pressure so that contaminants can be discharged through an exhaust system rather than leaked through cracks and around doors to other parts of the ..
A development is being planned within a 250-acre watershed. The present land use is 120 acres of pasture, with soil type B(CN=61), and the rest soil type D (CN=80). The Tc is 54 min. and the 2-year, 24-hour storm depth is 4 in.
If the column is subjected to an axial compressive force of 800 kN, determine the required diameter of each reinforcing steel bar so that one-third of the load is carried by the steel and two-thirds by the concrete. Assume Esteel= 200 GPa and Econ..
How far apart must two 18 m diameter tanks be placed such that their stress overlap is not greater than 10% of the contact stress at depths of 10, 20, and 30 m
Primary treatment removes ~25 percent of the BOD. Calculate the volume (m3) and approximate hydraulic retention time (h) of the aeration basin required to run the plant as a "high rate" facility (F/M = 2 kg BOD/kg MLSS-day).
The partial pressure of the gasses in a 22,414-L volume of air at STP are: oxygen, 21,224 kPa; nitrogen, 79,119 kPa; argon, 0.946 kPa; and carbondioxide, 0.036 kPa. Determine the gram molecular weight of air.
For an elevated storage tank , if the minimum allowable pressure = 300 kPa, Height of pipe system at low-pressure service location = 6 m, and head loss from tank to service location: average daily conditions = 11 m
Additional cost at the end of year 1 = $50,000. Benefit at the end of year 1 = $0. Annual benefits at the end of Years 2-10 = $20,000. Interest Rate = 7%. Conventionally B/C ratio and wheter the project is economically stable.
A vertical triangular orifice in the wall of a reservoir has a base 0.9m long,0.6m below its vertex and 1.2 m below the water surface. Determine the theoretical discharge?
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