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Q. What is Raft Foundation?
A raft or mat is combined footing that covers the entire area beneath a structure and supports all the walls and coloumn when the allowable soil pressure is low or the building loads are heavy the use of spread footing would cover more than one half of the area and it may prove more economical to use mat or raft foundation. They are also used where the soil mass contains compressible lenses or the soil is sufficiently erratic so that the differential settlement would be difficult. Raft foundation is also used to reduce settlement above highly compressible soil by making the weight of structure and raft approximately equal to the weight of the soil excavated. Ordinary rafts are designed as reinforced concrete flat slab.
A storm occurs with rain of varying intensity falling over a commercial area. The area has a combined sewer system. Two interceptor sewers direct flow to the wastewater treatment p
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Q. Function of waterproof (or separation) membrane for concrete carriageway A layer of waterproof (or separation) membrane is usually placed between sub-base and concrete slab
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A five-mile long section of two-lane road has an AADT of 8,000. There have been six crashes on this section of road during the past two years. What is the crash rate? R sec
Immersed tube method for underwater crossing includes the following basic construction steps: (i) Prefabricating long tunnel units (concrete orsteel shell) in a dry-dock or shi
what is dredge line
Determine the hydraulic radius R for a rectangular open channel with dimensions of 6 ft wide and 4 ft high (side walls) flowing at a depth of 3 ft. Solution: R = A/P Cross-s
.the assumptions in theory of riveted joints
how can you draw contours of a non square grid?
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