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Explain the Ion Exchange water Softening
Softening is usually done using a resin (natural or synthetic long chain chemical with a sodium ion attached). When water containing hardness ions is passed through the resin, the hardness ions (Ca, Mg) exchange with Na ions on the resin (thus the resulting water is free of hardness ions but high in sodium).
When the sodium ions on the resin are exhausted, the resin is regenerated using a brine solution (which replaces all hardness ions attached to the resin with Na ions again) and the resin can be used again.
What is Stress Corrosion Stress corrosion takes place in prestressed concrete tendons due to the combined actions of corrosion and static tensile stresses. This type of attack
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Limit State of Serviceability Deflection In the consideration of this limit state, the deflection of a structural member is considered. The code recommends that the deflection
minimun difference in level of inlet and oulet pipe level invert in manhole
effective CBR
How to do deflection calculations Basic values of span to effective depth ratios for spans upto 10m may be taken as 7, 20 and 26 for cantilever, simply supported and continuous
CEMENT RATIO MEANS
The footprint of a proposed office building is overlaid on the existing contours topographic map of a sloping site as shown in the figure. The structural bays which are 65-ft by 65
list and explain the types of concrete mixer
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