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

Grillage foundation, what are the advantages of grillage foundation and why...

what are the advantages of grillage foundation and why people prefers that?

Continuous flow systems, Continuous Flow Systems: Transport by road, r...

Continuous Flow Systems: Transport by road, rail, air or ships takes place in vehicles which move along a path at intervals. As against this, continuous flow systems are those

Diagrids, can we provide base isolation for high rise buildings ? Can we pr...

can we provide base isolation for high rise buildings ? Can we provide it for diagrid structures? if; yes Up to which no of storeys

Explain influence lines-reactions, Explain Influence lines-reactions 1....

Explain Influence lines-reactions 1.  Remove the support under investigation 2.  Displace the beam vertically a distance of 1 unit.  The resulting beam shape will be the sha

Disparities between regular precast and pipe jacking, Question What are...

Question What are main disparities in design between regular precast concrete pipes and pipes used for pipe jacking ? Answer For pipes used for pipe jacking, they h

LEVELLING, WHAT IS FLYBBACK LEVELLING

WHAT IS FLYBBACK LEVELLING

Plane tabling, difference between compass suveying and chain surveying

difference between compass suveying and chain surveying

SURVEYING II LAB, Explain Designation of bearings. Calculate included angle...

Explain Designation of bearings. Calculate included angle from bearings

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