S. V. Chandramouli, Manager (Technical) Sindhu S Saraswathi, Manager (Technical Services); Sharad R Pothnis, Business Executive-NDT, and Ravikumar, Market Development Engineer, BBR (India) Pvt. Ltd., Bangalore.
Concrete structures as many other engineering structures are subjected to deterioration that affect their integrity, stability, and safety. Faced with the importance of the damages noted on the structures, the current choices are directed towards the repair of the existing structures rather than towards the demolition and construction of new ones. But before any repair work being done, it is a common practice to study the existing structures by analysis after ascertaining the quality of material. Destructive methods of evaluation are inherently limited because specimen removal may be relatively expensive, aesthetically unpleasant and structurally damaging. The number of specimens taken may be limited to a small number for such evaluation method. Thus, potentially, the quantity and quality of the resulting data may be poor and/or inconsistent. Non-destructive Testing is usually undertaken as part of the detailed investigation to complement the other methods. The conclusions of the investigation are based essentially on these tests. The use of Schmidt hammer is commonly accepted for the preliminary assessment of surface concrete strength as the non- destructive test. This article discusses the assessment of existing concrete member by the use of Schmidt hammer and highlights few application importance and limitations for repair and rehabilitation projects.

Introduction

Concrete structures as many other engineering structures are subjected to deterioration that affect their integrity, stability and safety. Faced with the importance of the damages noted on the structures, the current choices are directed towards the repair of the existing structures rather than towards the demolition and construction of new ones. But before any repair work being done, it is common practice to determine the causes of the deterioration so that successful repair can be done. Many repair work fail because the exact causes of the deterioration was not adequately identified. This identification process comprises many methods including non-destructive testing methods. Non-Destructive Testing (NDT) is usually undertaken as part of the detailed investigation to complement the other methods. The conclusions of the investigation are based essentially on these tests. A correct assessment of a deteriorated structure is a crucial basis for the success of a repair system. Experience has shown that in many cases repairs fail much earlier than expected due to improper diagnosis of the actual situation of the structure, either because the cause of the degradation was not properly understood, or the extent of the damage was under-stated. The strength of the concrete structure will vary by age but its rate may depend on various factors. Since, the use of Schmidt hammer is commonly accepted for the preliminary assessment of concrete surface hardness as the non destructive test, this will provide useful estimation of the uniformity of concrete and measure the strength of existing surface concrete and to detect weak spots. This article discusses the assessment of surface hardness of existing concrete member by the use of Schmidt hammer and highlights few application importance, and limitation for repair, rehabilitation projects.

This section of the article is only available for our subscribers. Please click here to subscribe to a subscription plan to view this part of the article.

Click Here
To Know More or to Contact the Manufacturer
Please let us know your name.
Invalid Input
Please let us know your Designation.
Please let us know your Contact Number.
Please let us know your email address.
Please brief your query.
Our other Value-Added Services:

To receive updates through e-mail on Products, New Technologies & Equipment, please select the Product Category(s) you are interested in and click 'Submit'. This will help you save time plus you will get the best price quotations from many manufacturers, which you can then evaluate and negotiate.

Invalid Input
Invalid Input
Invalid Input
Durability is a key requirement for modern infrastructure projects – highways and roads, bridges, airports and airfields, walkways and plazas, parking structures and stadiums. Miles of concrete must

Read more ...

Buildings have major environmental impacts over their entire life cycle. Resources such as ground cover, forests, water, and energy are depleted to give way to buildings. Today, India has demonstrated

Read more ...

Scour is a natural phenomenon caused by the erosive action of flowing stream on alluvial beds. Failure of bridge due to scour at their foundations, which in this case consisted of abutments and pier, one 1.2 dia

Read more ...

To protect concrete structures like Flyovers, Bridges, Parking areas, Big Commercial and Residential Buildings, the normal decorative exterior paint will not serve the purpose as these paints are not vapour permeable

Read more ...

Repair Strategy of Stoplog Sill Beams During Operation Stage of 510 MW Teesta-V Power Station in Sikkim Running Power Stations serve as a boom to the economy of the country and any generation loss due to construction

Read more ...

Concrete protective liner is a multipurpose solution for waterproofing and protection of concrete surfaces against corrosion and destruction. The product warranties long-term and reliable protection of structures

Read more ...

Sangeeta Pandey, Chief Manager (Civil), Power Grid Corporation of India Ltd., Patna, PVS Sudhakar, Sr. General Manager (Civil), NOFN Works, Power Grid Corporation of India Ltd., Vishakhapatnam & Dr. Achintya, Professor of Civil

Read more ...

Samir Surlaker, Director, Assess Build Chem Private Limited discusses some new joint treatments and injection systems in waterproofing. It is a myth that waterproofing treatments can be carried out by application of single material

Read more ...

Years of research plus decades of practical experience have enabled FAIRMATE to develop detailed solutions to restore and rehabilitate concrete structures with structural rehabilitation, retrofitting and strengthening of RCC structures

Read more ...

Sunny Surlaker, Head Technical Services, Assess Build Chem writes on the selection ideologies, materials and methods for defect remediation in Concrete Buildings. The building façade or the envelope is the primary line of

Read more ...

This article provides some basic information on effects of fire on concrete, various condition evaluation methods, and show findings from a case study of a fire exposed concrete foundation in California, and informs construction

Read more ...

There is considerable controversy within the concrete repair industry regarding the use of bonding agents as a pretreatment method for the repair of deteriorated concrete. This paper examines the use of bonding agents

Read more ...

This paper discusses the effects of fire on concrete and provides a methodology to assess, evaluate and repair concrete structures. Though concrete is among the best fire-resistant building materials, it does get damaged when

Read more ...

The ACI 562 Code Requirements for Assessment, Repair, and Rehabilitation of Concrete Structures and Commentary was first published in 2013 and revised in 2016. Development of ACI 562 was an industry response to variations

Read more ...

The repair industry in India and for that matter, throughout the world, is like the story of an elephant described by seven blind people. Whichever part of an elephant will come in the hands of a blind man, the elephant will be described

Read more ...

The Chamera Hydro-Electric Project (Stage-III) is located on the river Ravi at village Kharamukh (250.0 m downstream of the confluence of river Ravi and Tundah Nala) in Chamba district of Himachal Pradesh. The Project consists

Read more ...

Terex — a diversified global manufacturer of equipment for mining and quarrying industries — is celebrating 10 years of operations in India and has announced expansion plans for its 45-acre manufacturing plant in Hosur, with which it plans

Read more ...

The rapid boom in the construction industry, has tremendously given rise to the demand for sand, causing deficiency of suitable river sand in many parts of India. Besides, river mining causes imbalance in the river bed water flow, and

Read more ...

Regardless of the quality of pavement material and design, increase in vehicular traffic and changing environmental conditions will reduce the service life of pavements and ultimately result in their failure. The causes and

Read more ...

With the increase in construction of buildings in the last two decades, it has been observed that many of the structures are already showing signs of distress. In some cases, repair measures become necessary even within a span

Read more ...

×
Sign-up for Free Subscription
'India Construction Week'
Weekly e-Newsletter on Construction Industry
Get the latest news, product launches, projects announced / awarded, government policies, investments, and expert views.