What are the characteristics of a workable mix?
What will be an ideal response?
In a workable mix, all the aggregates are clean, all Portland cement is mixed with water to form a
cement paste and no dry powder is present, every particle of aggregate is covered with cement paste,
aggregates are distributed evenly throughout the mix, no more than the recommended amount of water
is added, no lumps are present, the mixture has uniform color and consistency, and lastly, the mixture
can be mixed, moved, and placed with a shovel or spade.
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The aggregate mix used for the design of an asphalt paving concrete consists of 42% coarse aggregates, 51% fine aggregates, and 7% mineral fillers. If the respective bulk specific gravities of these materials are 2.60, 2.71, and 2.69, and the effective specific gravity of the aggregates is 2.82, determine the optimum asphalt content as a percentage of the total mix using results obtained using the Marshall method as shown in the following table. The specific gravity of the asphalt cement is 1.02.
What will be an ideal response?
Energy codes and standards set minimum requirements for energy-efficient design and construction for ________ buildings that impact energy use and emissions for the life of the building
A) renovated B) old C) new and renovated D) new
Pressure vessels such as boilers should have a placard on or near the vessel that displays:
A) The material the vessel is made of and the name of the inspector. B) When it was inspected and when the next inspection should be. C) The manufacturing date and type of material the vessel is made of. D) The parts per million casting impurities and the alloy shear strength.
The density of a gas that occupies 30 cubic feet and weighs 3 pounds is:
A) Density = 3 pounds / 30 cubic feet = 0.1 lbs/ft3. B) Density = 30 cubic feet / 3 pounds = 10 ft3/lb. C) Density = 3 pounds × 30 cubic feet = 900 lbs/ft3. D) Density = 30 cubic feet + 3 pounds = 33 lbs/ft3.