Increasing concrete cover beyond contractual, Civil Engineering

Assignment Help:

Question
If contractor suggests increasing concrete cover beyond contractual such as 40mm to 70mm shall engineers accept suggestion?

Answer
In contractual part, based on requirement of General Specification of Civil Engineering Works, tolerance of concrete cover is involving +5mm and -5mm and engineers must not believe sub-standard work as they do not possess an authority to change acceptance criteria. In that case where engineers think contractor suggestion acceptable in technical point of view, consent has to be required from employer regarding changes in receiving criteria.

From practical point of view, effect on cracking because of an enlarge in concrete cover have to be considered. In general, there are three major parameters which govern crack width, namely tensile damage at the point considered, distance of longitudinal bar to concerned point and depth of tension zone.

For second factor, as in proximity of longitudinal bars to point of part, closer a bar is to this point; smaller is crack width. So, closely spaced bars with smaller cover determination give narrower cracks than extensively spaced bars with larger cover. So, with an increase of concrete cover, crack width will add to that is undesirable.

 


Related Discussions:- Increasing concrete cover beyond contractual

Shear force and bending moment, relation between shear force and bending mo...

relation between shear force and bending moment and examples based on those relationship

Jacking face for pipe-jacking, Ground settlement occurs ahead or behind the...

Ground settlement occurs ahead or behind the jacking face for pipe-jacking? It's reported by Lake (1992) that settlements are expected at ground surface at a distance of 1-2 ti

Velocity distribution and flow formulae, Q. Velocity distribution and flow ...

Q. Velocity distribution and flow formulae? Variation in velocity along a vertical in channel cross section is known to follow logarithmic distribution, maximum velocity being

Correction for construction period, You are aware that construction of any ...

You are aware that construction of any type of structure takes sometime. Pressure due to the building will be applied gradually and not instantaneously. Excavation for the construc

Explain some important points for hazardous waste, Explain some Important P...

Explain some Important Points for Hazardous Waste The mixture rule prevents dilution of waste for the purposes of escaping RCRA regulation. Mixtures of a listed hazardous w

Principle of airlifting for cleaning pile bores, Q. Principle of airlifting...

Q. Principle of airlifting for cleaning pile bores? Airlifting is generally carried out before concreting to remove debris and clean the base of pile bores. It basically acts a

Smallest size of a325 bolts needed for two plates in tension, What is the s...

What is the smallest size of A325 bolts required for the two plates in tension noted below, assuming the thickness of each plate is 1.0-in. and the applied force at each end is P=2

Show method of greasing, Method of Greasing : Greasing of fixed end require...

Method of Greasing : Greasing of fixed end requires 20 to 25 minutes. The lifting is hardly 10 mm, ensuring that the gap is created between saddle block and knuckle pin. Saddle is

Expansion jiont, some expansion joint(10 mm- 20 mm) on my basement roof.rai...

some expansion joint(10 mm- 20 mm) on my basement roof.rain water leakage in basement i want the solution of expiation joint and water leakes.

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