Extending Service Life of Concrete & Steel Structures

Structural Assessment, Testing, Repairs & Strengthening Techniques

Course Description

Introduction

There is a common belief that life of a structure is 100 years. When we see around us, we find that is true in case of some buildings like Chhatrapati Shivaji MaharajTerminus Building (Erstwhile V.T.) in Mumbai. Whereas there are so many other buildings around us which show symptoms of deterioration within 10-15 years of life. Many questions come to our mind in such a situation. What is wrong with our construction? Why buildings deteriorate so fast? Also, there are situations when distress is seen in structure due to various factors like age, chemical attack, earthquake etc. Many times existing machinery needs to be changed to cater modernization needs. In such cases, it is essential to strengthen existing structures to cater for this additional burden.All this calls for handling various issues like structural assessment, NDT, Repairing the distress, waterproofing, Estimating & costing of Repairs & Rehab work etc. In either case, it is inherent to repair & maintain the structures. Many a time it becomes essential to retrofit existing structure to accommodate modern machinery.The annual expenditure on this repairs and retrofitting works in our country is about Rs. 80,000 crores (Eighty thousand crores). It is relatively straightforward to estimate the cost of new construction projects but Repairs is a different game.The estimates if not done properly can go haywire, leading to tremendous cost overruns.The second important facet is to achieve desired results after spending the huge amount of money.This again requires a lot of good insight of repairs operation.The field of Building Repairs is not 100% science. It requires knowledge from many other branches of Geography, History, Architecture, Material technology and so on

The Repairs industry is dominated by construction chemicals industry, who works for promoting their own interest rather than client's interest. In this scenario, it is imperative that executives develop an insight of the whole operation. This will help to conduct the operations with better technical and financial control.

This two-day program will help participants to understand various facets of the Repairs operation, how to control un-necessary expenditure and achieve “value for money” spent.

This 2 days program will address all the facets of Repairs & Rehabilitation.

The benefit of training from a construction repair audit:

  • A construction repair audit can help set the tone for the project repair by establishing oversight.
  • Involving an experienced construction repair auditor in the contract stage often results in increased savings through cost avoidance.
  • Early involvement yields more savings than a stand-alone, closeout audit.
  • Your risk and rights under the contract are being protected.
  • With a construction repair audit, you look at contract terms, identify overcharges, suggest how to better manage risks and examine your control procedures to make sure they’re functioning properly.
  • A construction repair audit assures you that the financial piece of the project is being well managed and monitored.

Training Agenda

Extending Service Life of Concrete & Steel Structures (Structural Assessment, Testing, Repairs & Strengthening Techniques)

Two days training agenda:

Day One

Session I: Structural Assessment

Understanding various terms like Structural assessment – Condition survey – Structural audit – NDTThe need of Structural assessment – Statutory requirements – Periodic check-up – Change of user change in loading – Earthquake damage.

Design office work – Data collection – Collection of drawings –Difficulties in collecting old records –Assumptions – Modeling.

Data collection from field – Condition survey – Co-relation with drawings – NDT

Session II: NDT

Understanding NDT– Rebound hammer – Ultrasonic pulse velocity – Core test – Half cell potentiometer – Chemical analysis – Carbonation test – Cover meter – Survey – Other tests

Information gained from various test results – their limitations – Interpretation of results – codal provisions – How to use these results.

Session III: Condition Survey

Site visits – what to look for – various distress symptoms – mapping of distress- Preparing records – on drawing – Text form – photographs - summarizing observations Report writing – points to be covered.

Session IV: Distress

Understanding Distress mechanism – Various symptoms of distress – What to look for – Understanding manifestation of distress – types of cracks – location & pattern of cracks – interpretation of cracks – Interpretation of observations and deriving the type of distress cause – like settlement, overloading – foundation failure – corrosion of reinforcement etc.

Day Two

Session V: Repairing the distress

Understanding whether repairable or not – choice of material & methodology – factors affecting selection – cost – availability of suitable agency – trained manpower

Properties of different materials – their pros & cons – BondingAgent – sealants – Repairs Mortars – selection from vast availability – Deciding the right    chemical – checking &Testing the chemical – Facilities for testing – codal provision

Session VI: Addressing Distress:- Damage due to Corrosion of Reinforcement Bars

Most common distress – How to identify – Understanding extent of damage – Recurrent nature of problem Common Methodologies – Guniting – Epoxy – Polymer Mortars – Micro concrete – Corrosion inhibitors – surface sealers – Desalination – Realkalisation – pros & cons. Longevity of repaired patches – How to improve them

Session VII: Waterproofing

Water leakage – one of the important factor damaging structures – Understanding leakage mechanism –

Various systems available for leakage prevention – Coating – membrane – barriers – chemically reactive – tanking vis – a – vis inbuilt design protection

Pros & cons of various system – degree of protection they offer

Selection of treatment – Factors affecting selection –Temperature – Rainfall – humidity – sunshine. Guarantees – warranties – their importance or otherwise

Session VIII: Estimation & Costing

Estimation – daunting task – Not straightforward – Understanding effect of distress causing factor and methodology to repair – its influence on estimating & costing

Working out suitable parameters to simplify calculations Understanding specification of selected material – working out rate analysis – arrive at near accurate costing

Session IX: Case Studies and Group Discussions

Course Director

Laxmikant Umarji Senior Professional Engineer, Registered with Engineering Council of India, having 41 years of all round experience in Construction, Repairs, Rehabilitation & Retrofitting projects. Worked all over India & abroad for Residential, Industrial, Hydro Power, Thermal Power & Transmission line projects. Seasoned Trainer for various corporate like Tata Housing, Lodha, Runwal, Ajmera, Kanakia, L&T etc. Conducted many open public training programmes. Professional Affiliations: Life member of Indian Concrete Institute, Institute of Engineers India, American Concrete Institute, Association of Consulting Civil Engineers, Indian Society of Structural Engineers.
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