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Q. What do you mean by Ozone Test?
Some research and studies determined that the ozone test was unnecessary as this affects only the surface layer. In un-stretched rubber, ozone degradation is confined to a thin surface layer, typically 0.5 µ. Ozone cracks develop at right angles to the tensile strain and they degrade rubber's tensile strength and may also initiate fatigue growth that ultimately leads to failure of rubber products. Because cracks only occur in regions where tensile stresses are induced, they are unable to penetrate very far into objects, which are under compression. In bearings, the growth of cracks ceases close to the surface because cracks quickly encounter compressive rather than tensile stresses. Therefore, it has been contended that ozone damage is a serious concern in thin-walled products, but not in those bulky products like bearings. Contrarily there is a harmful effect because the manufacturers use anti ozanant waxes to protect against ozone attack. This viscous layer of wax is responsible for a significant number of serious slipping problems where the bearings 'walked-out' of the support area.
Q. Back fill behind the abutments of bridges? Dry Rubble - At the bank of all bridge abutments and wing walls, the space next to the masonry is to be filled in by a hand-pack
What are exogenous tree.explain
A saturated clay layer 4 m thick is located 6 m below GL. The void ratio of the clay is 1.0. When a raft foundation is located at 2 m below GL, the stresses at the top and bottom o
Design of beam
Q. Settlement due to Increasing Load on Surrounding Soil? When any portion of the ground surface has been loaded, it causes the surface of adjacent soil also to tilt and set
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Explain the Critical Flow Critical flow occurs where the flow depth is at the critical depth. One location in an open channel is where the flow is approaching a free outfall.
Q. Local vehicle parapet strong enough to contain vehicles? Majority of local parapets are 1.1m high in addition they are designed to resist impact from a 1.5ton car moving at
Sight Distance: Sight distance is the distance along a road at which a driver has a visibility of objects and can safely stop his vehicle or overtake another vehicle. Sto
Road Location in Dune Areas: The following principle should be observed in locating a road in dune areas : (a) Align a road where sand is covered by vegetation. (b) Sel
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