Water retaining structure, Civil Engineering

Assignment Help:

Question

Why do BS8007 specify permissible crack width of water retaining structure as 0.2mm for severe, extremely severe exposure?


Answer

For break width less than 0.2mm, it is thought that mechanism of autogenous healing will take place in which crack will routinely seal up and this would not cause problem of leakage and reinforcement corrosion in water retaining organization.

When cracks are in inactive state anywhere no movement takes spaces, autogenous healing occurs in presence of water. Still, when there is a continuous flow of water from side to side from these cracks, autogenous healing would not acquire place since flow removes the lime. One of mechanisms of autogenous healing is that calcium hydroxide in concrete cement reacts with carbon dioxide in atmosphere, resulting in formation of calcium carbonate crystals. Slowly these crystals build up and grow in these tiny breaks and form bonding so that cracks are sealed. Because first documented discovery of autogenous healing by French Academy of Science in 1836, there have been numerous preceding proofs that crack be sealed up naturally by autogenous healing. Since of its self-sealing property, designers normally bound crack width to 0.2mm for water retain arrangement.

 


Related Discussions:- Water retaining structure

Building construction drawings, I need a drawing detail of expansion joints...

I need a drawing detail of expansion joints in building and different sizes

Explain the national primary drinking water standards, Explain the National...

Explain the National Primary Drinking Water Standards Safe Drinking Water Act (SDWA, 1974) required EPA to establish maximum contaminant levels (MCLs) for public water systems

Deflection, solving problems with their answer

solving problems with their answer

Cargo handling facilities, Cargo Handling Facilities: All water transp...

Cargo Handling Facilities: All water transport terminals require cargo handling facilities. Cranes of various sizes are used. In docks, traveling cranes are popular (Figure).

Explain the tertiary treatment for wastewater, Explain the Tertiary Treatme...

Explain the Tertiary Treatment for Wastewater Tertiary Treatment: in cases where secondary treatment is not adequate (particularly if the discharges are into a sensitive water

Distomat, Ask quetypes of stion #Minimum 100 words accepted#

Ask quetypes of stion #Minimum 100 words accepted#

Concrete compaction in piling works, Question What is the reason that v...

Question What is the reason that vibrators not used in concrete compaction in piling works ? Answer Concrete for piles must be a high-slump self-compacting mix that i

Sealing moving cracks and non-moving cracks, Sealing moving cracks and non-...

Sealing moving cracks and non-moving cracks In developing a suitable method to seal up cracks detected on concrete surface, it's of paramount importance to conclude if further

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd