Construction Diagnostic Centre Pvt. Ltd.

Karve Road, Pune, Maharashtra

Non Destructive Testing - We have a full range of NDT instruments and conduct tests such as - • Rebound Hammer Test – To assess the quality and strength of site concrete • Ultrasonic Pulse Velocity Test - To assess the quality and strength of site concrete • Concrete Core Extraction – To assess the strength of site concrete, Making holes in RCC for Plumbing / Electrical purpose • Rebar Location & Cover-meter – Locating Reinforcement in the concrete. • Half-cell potential Test / Resistivity Test - for reinforcement corrosion mapping • Pile Integrity Test – For assessing the integrity, continuity & depth of pile • Vibration Measurement – For measuring Displacement, Velocity & Acceleration of civil structures. • Endoscopy / Bore scope - To inspect the in-accessible areas of structures , building components, Heritage structures, pipes • Ultrasonic Thickness Gauge – For metal plates, pipes • Moisture Measurement – For measuring the moisture / dampness in timber, masonry, concrete, plaster • Infrared Thermometers – Used in combination with Moisture meters to identify the temperature gradient and spot temperatures from a long distance by just sighting the object., a very useful tool in structural audits of the buildings, water structures, chimney etc. • Load Test – Performance acceptance test for flexural members & Bridges • Carbonation , Sulphate / Chloride Content tests • Calibration of Rebound Hammers

We Provide Construction Material Laboratory Testing.follow from pdf provided

Ours is a Maharashtra (India) based organization involved in providing reliable Repair & Rehabilitation Consultancy services to the clients at very reasonable prices. We are known for carefully restructuring the structures that are in a distressed condition. Some structures require repair due to several causes such as poor quality concrete workmanship, construction deficiencies, design deficiencies, severe exposure condition, corrosion, aging, damage due to earthquake, fire, blast, vibrations, settlement & foundation problems, etc. Our consultancy includes detail visual assessment, NDT, preparing Repair Rehabilitation scheme and preparing estimates as well as tender documents, etc.  We have restructured various Chemical Plants, Corrosion of Pipe Racks, Corrosion of RCC Chimney, Corrosion of RCC Silo, Fire Damaged Commercial Building-Pune, Fire Damaged Factory Building and Pharmaceutical Plants. We have provided consultancy for : List of Earthquake Damaged structures : Royal Nirman – Satellite , Ahemedabad Sanjay Towers – Satellite , Ahemedabad List of Fire Damaged structures : Muthha Chambers – II , S.B. Road, Pune -  Commercial Multi-storey Building – Ashok Iron Ltd, Belgao – Factory Building Invensys – Pune – Factory  Building Hinjawadi, Pune – Factory Office Block Cummins Ltd, Pune -  Factory Building ABS Electro- Sanaswadi, Pune – Factory Building Hindustan  Insecticides  Ltd, Rasayani, Maharashtra – Godown Sambhaji – Gujrat – Godown Life Ltd. Solapur – Factory Buildings Pachakshri Industries, Solapur Vamsi Lab, Solapur

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We offer Ultrasonic Pulse Velocity Testing services according to IS – 13311 (Part 1): 1992. Located in Maharashtra (India), our services are highly in demand. This method is used for testing ultrasonic pulses that are transmitted through the concrete. In solids, the particles can oscillate along the direction of sound propagation as longitudinal waves, or the oscillations can be perpendicular to the direction of sound waves as transverse waves.  At surfaces and interfaces, various types of elliptical or complex vibrations of the particles occur. Our instrument is dependent on Dynamic Young’s Modulus, density, and Poisson’s ratio of the material. A complex system of stress waves is developed which includes longitudinal (Compressional), shear (transverse) and surface (releigh) waves. Piezoelectric transducers are designed to generate longitudinal and transverse (shear) waves. The active element of most acoustic transducers is piezoelectric ceramic. These transducers convert electrical signals into mechanical vibrations (transmit mode) and mechanical vibrations into electrical signals (receive mode).  The travel time is measured with an accuracy of +- 0.1 microseconds. Transducers with natural frequencies between 20 kHz and 200 kHz are available, but 50 kHz to 150 kHz transducers are common.

Core Testing services that we provide are highly admired by the clients. We are located in Maharashtra (India) and provide core tests according to IS – 516 – 1959,  IS – 1199 – 1959 & IS - 456 – 2000. Core Testing isa reliable testing that is done for checking the compressive strength of the ‘In situ concrete”.  Other physical properties such as density, water absorption can also be measured from the core concrete. In addition to this, chemical properties of concrete specimen for its cement content, carbonation depth, chloride and sulphate content can also be measured by this. The test can be used for slabs, walls, etc., where partial destruction of concrete due to core cutting does not disturb the stability of the member.  In this  method  concrete cores of sizes  raging from 20 mm  to  150 mm in diameter and 50  mm to  500 mm  long  are drilled out  by  a diamond cutters. The recommended diameters are 100 to 150 mm, but if the drill depth is insufficient as in of case slabs, then smaller diameters may be used but not less than three times nominal aggregate size.  The core diameter to length ratio shall be normally between 1.0 to 2.0 (preferably 2.0). The core diameter shall be at least three times the nominal maximum size of aggregate. Reinforcement shall be avoided in the core. At least three cores shall be tested for acceptable accuracy. These cylindrical concrete cores are then made smooth at both ends (if required) and then tested for compressive strength. If required capping of the faces shall be done. The strength of capping material shall be higher than that of concrete in the core. Cap shall be as thin as practicable.  The specimen shall be cured in water for 48 hours before testing. The cylindrical strength is then co-related to cube strength. IS – 516 suggest a multiplying factor of 1.25 for converting cylindrical strength to equivalent cube strength. In addition a correction factor for height to diameter ratio shall be applied as given in IS – 516.  IS – 456 states that the concrete in the member represented by a core test shall be considered acceptable, if the average equivalent cube strength of core is equal to at least 85 % of the cube strength of the grade of concrete specified, but no individual core has strength less than 75 %.   Application : The core cutting is mainly conducted for : Determining “In situ” compressive strength of structure. Small cores for chemical tests Inserting water supply, plumbing pipes inserting conducts for electrical cables Making pockets for machine foundation for inserting bolts Making weep holes in walls   Reliability & Limitations : As this test gives actual in situ strength of concrete is more acceptable, but due to partial destructiveness needs to be used very carefully. The reliability of small cores i.e. 40 – 50 mm is less as compared to normal cores. The detection of reinforcement shall be perfect. If the quality of concrete is not good, one may not even get a complete core for testing. The cost of core cutting is more compared with other ND tests, as it consumes diamond bits, which are costly.

Our company is located in Maharashtra (India) and provides trustworthy Reinforcement Detection services to the clients. The reinforcement is detected by magnetizing it and inducing a circulating “eddy current” in it. After the process, the eddy current dies away and the strength of the induced field is measured by a search head. After that, a signal is processed to give the depth measurement. The echo of eddy current is determined by the depth of the bar, the size of bar and the orientation of the bar, which is required as a pre-process for core cutting. Reliability & Limitations : With this instruments  a cover to reinforcement can be measured up to 70 – 150 mm with an accuracy of  ± 15 % and Manufacturers claim accuracy of a bar diameter measurement to be less than 2 to 3 mm. But it has observed that, most of the available detectors do not accurately measure the bar diameter. Proper calibration of these instruments is very essential.  The factors which affect the accuracy are : Very closely spaced bars or bundled bars or bars in layers, Binding wire, aggregate containing iron or magnetic properties.

The company is located in Maharashtra (India) and involved in providing Half Cell Potential Testing services to the clients at very affordable rates. The instrument we possess measures the potential and the electrical resistance between the reinforcement and the surface to evaluate the corrosion activity as well as the actual condition of the cover layer during testing. The electrical potential of a point on the surface of steel reinforcing bar can be measured comparing its potential with that of copper – copper sulphate reference electrode on the surface. Practically this achieved by connecting a wire from one terminal of a voltmeter to the reinforcement and another wire to the copper sulphate reference electrode. Then general readings taken are at grid of 1 x 1 m for slabs, walls and at 0.5 m cc for Column, beams. The risk of corrosion is evaluated by means of the potential gradient obtained, the higher the gradient, the higher risk of corrosion.  The test results can be interpreted based on the following table : Half – cell potential (mv) relative to  % chance of corrosion activity Cu-Cu sulphate Ref. electrode Less than - 200 : 10 % Between – 200 to – 350 : 50 % (uncertain) Above – 350   : 90 %   Significance and use : This method may by used to indicate the corrosion activity associated with steel embeded in concrete. This method can be applied to members regardless of their size or the depth of concrete cover. This method can be used at the any time during the life of concrete member.   Reliability & Limitations : The test does not actual corrosion rate or whether corrosion activity has already started, but it indicates the probability of the corrosion activity depending upon the actual surrounding conditions and no information relating to corrosion kinetics can be obtained. If this method used in combination with resistivity measurement, the accuracy is higher.   If the concrete surface has dried to the extent that it is dielectric , then pre wetting of concrete is essential especially for Cement Silos, Exposed roof slab. The Quality of the cover concrete, particularly its moisture condition and Contamination by carbonation and or chlorides may affect the results

We are involved in lending excellent Pile Integrity Testing services to the clients. Based in Maharashtra (India), we provide Pile Integrity Testing services in case of defective pile shaft necking, discontinuity of concrete, intrusion of foreign matter and improper toe formation due to contamination of concrete at base with soil particles, washing of concrete due to high water current, adoption of improper construction method, poor quality control on concreting etc. Cracks can also be a cause of failure, so if pile integrity can be assessed before completion of pile caps, then this will go a long way towards certification of pile integrity. Our Pile Integrity Testing is a quick procedure that enables number of piles to be examined in a single working day. This method provides information about continuity, defects such as cracks, necking, soil incursions, changes in cross section and approximate pile lengths ( unless the pile is very long or the skin friction is too high). In this test, a small metal / hard rubber hammer is used to produce a light tap on the top of the pile. The shock traveling down the length of the pile is reflected back from the toe of the pile and recorded through a suitable transducer / accelerometer ( also held on the top of the pile close to the point of impact) in a computer disk for subsequent analysis. The primary shock wave which travels down the length of the shaft is reflected from the toe by change in density between the concrete and the sub strata. However, if the pile has any imperfections or discontinuities within its length these will set up secondary reflections which will be added to the return signal. By a careful analysis of the captured signal and knowledge of the conditions of the ground, age of the concrete etc., a picture of the location of such problems can be formed. Principle & Procedure : Hammer impact on the surface and a receiver monitors reflected stress wave. Time domain analysis used to determine travel time. Based on One Dimensional Stress Wave approach, a low strain integrity testing The pile head motion is measured as a function of time. The time domain record is then evaluated for pile integrity.   Significance and use : Suitable for - Slender structural elements like structural columns, driven concrete piles, cast in place concrete piles, concrete filled steel pipe piles, timber piles. Evaluation of Pile integrity and pile physical dimensions i.e. cross-sectional area, length, continuity, and consistency of the pile material Piles shall be trimmed to cut off level or sound concrete level before the test with all laitance removed. For Pile Dia. > 500 mm take additional reading Apply Impact within a distance of 300 mm Filter the signal to eliminate High & Low frequencies In a few cases where piles are too long or skin fiction is high, low strain method does not provide sufficient information particularly the toe reflection. In such cases high strain method can be used by giving higher impact energies The cast-in-situ piles should not be tested normally before 14 days of casting as per IS code & not before 7 days as per ASTM. The reasonably correct assessment of Stress Wave Velocity of pile concrete is essential as an input. A Complementary Ultrasonic Pulse velocity test may be carried out at the head of the pile in order to arrive at the speed of sound propagation. The test being a low cost and speedy, it is recommended to carry out testing of 100 % piles. The further tests such as Dynamic or Static Load tests may be decided upon the results of Pile Integrity Tests.   Limitations : Evaluation is approximate and not exact. No information about load carrying capacity of pile. It does not provide information regarding verticality or displacement in position of piles. Minor deficiencies like local loss of cover, small intrusions or type of conditions of materials at the base of piles are undetectable. Integrity testing may not identify all imperfections, but it can be useful tool in identifying major defects within the effective lengths. The test may identify minor impedance variations that may not affect the bearing capacity of piles. In such cases, the engineer should use judgment as to the acceptability of these piles considering other factors such as load redistribution to adjacent pile, load transfer to the soil above the defect, applied safety factors and structural load requirements. Soil stiffness or founding on rock of similar density as the pile, will attenuate the signals such that there will be little or no toe reflection. The low strain integrity method is applicable to cast-in-situ concrete bored and driven piles. Conclusive results are rarely obtained in case of segmented precast reinforced concrete driven piles or precast piles in prebored holes.   It may not detect : The toe reflection when the L/D ratio roughly exceeds 20 (In hard soils) to 60 (In very soft soils) Progressive changes in cross-section Minor inclusions and changes in cross-section smaller than 25% . Variations in length smaller than 10%. Features located below a crack or a major (1:2) change in impedance Debris at the toe Deviations from the straight line and from the vertical.

Ours is a Maharashtra (India) based firm involved in providing reliable Structural Vibration Measurement services to the clients. We carry out Structural Vibration Measurement for Buildings Structures, Bridges,  Chimney Stacks, Water Tanks and Heritage Structures. Generally, the building vibration is measured in acceleration terms. In cases like impulsive events, it may be found convenient to measure in terms of particle velocity so that peak values may be identified. The ground born vibration from sources like blasting, piling, machinery or roadrail traffic can be a source of concern for occupants of buildings in the vicinity. Structural Vibration Measurement is carried out for variety of purposes like problem recognition, control monitoring, documentation and diagnostic. Problem recognition : Where it is reported that a building is vibrating at such a level as to cause concern to occupants, it may be necessary to establish whether or not the levels warrant concern for structural integrity. Control monitoring : Where maximum permitted vibration levels have been established by some agency and those vibrations have to be measured and reported. Documentation : Where dynamic loading has been recognized in design and measurements are made to verify the predictions of response and provide new design parameters. These may use ambient or imposed loading. Strong motion seismographs, for example, may be installed so as to indicate whether or not the responses to earthquake warrant changes on operating procedure in a structure. Diagnosis : Where it has been established that vibration levels require further investigation, measurements are made in order to provide information for mitigation procedures. Another diagnostic procedure is to use structural response to ambient or imposed loading to establish structural condition, for example, after a severe loading, such as an earthquake.

Structural Endoscopy is a kind of survey that is carried out to identify problematic or inaccessible areas where bear minimum destruction is allowed for inspection such as Concrete pipes, Water Pipes, Storm pipes, Sewer Lines, Culvert, Cavity walls, Air ducts, Vents, Chimneys, Ceiling, roof and floor voids, Water tanks,  Heritage structures, Timber structures, Concrete or Masonry structures with large voids, honeycombing, etc. We are located in Maharashtra (India) and engaged in providing excellent Structural Endoscopy services to the clients. Our professionals have ample experience in this domain of investigation of structures which enable us to conduct surveys with minimum of disruption to the structures, whilst providing detailed information. We provide Bore scope survey Rusting Inside Pipes, Bore Scope, Endoscopy of False Ceiling, and Endoscopy of Masonry.

We are known for providing reliable Load Testing services to the clients. Based in Maharashtra (India), we provide load testing of building & bridge components in case of the strength of concrete is below the acceptable norms, structural design data is not available, load carrying capacity of the flexural member needs to be assessed, the members is to be subjected to a higher loads, the members are noticed to have cracks, deflections, the structure is damaged due to fire, earthquake, blast, corrosion etc., and change in use of structure. IS – 456 – 2000 recommends that Load Testing of flexural members should be carried out in such case where the core test results do not satisfy the requirements. The Load Test for Building is carried out as per IS – 456. For Bridges Load test is carried out in accordance with IRC – SP – 51 – 1999, the load test can be performed by either loading with simulation of specific IRC vehicle (IRC – 37) or by other type of static load which produces the design forces. Load Test Procedure as per IS – 456- 2000. The  structure  should  be  subjected  to a load  equal to  full  dead  load  of  the  structure  plus  1.25  times  the imposed  load  for  a period  of 24  h and  then  the  imposed load  shall  be  removed.

We are into the business of providing Heritage Structures Conservation Consultancy services to the clients at very reasonable rates. Situated in Maharashtra (India), we provide complete assessment of the Heritage buildings. We are in possession of the latest Non Destructive Testing tools that includes Structural Audit & conservation consultancy services for structural strengthening & Retrofitting. Our Heritage Structures Conservation Consultancy services are highly demanded by the clients owing to our accuracy and promptness. We Offer Services To : Vishrambag wada – Built in 1800 - 1806 ( 205 years old ) – Ground + 2 Upper floor – Composite structure built in load bearing Brick Stone masonry  walls and Timber Column – Beam frame. The Wada was built by Bajirao II Nana wada – ( 250 years old ) – Ground + 1 Upper floor – Composite structure built in load bearing Brick masonry walls and Timber Column – Beam frame. The Wada was built by Nana Phadnavis; who after the assassination of Peshwa Narayanrao in 1773 managed the affairs of state Kasba Ganapati Mandir - Built around 1630  ( 380 years old ) – Ground + 1 Upper floor – The main temple is in Stone masonry and the Sabha-mandap and adjoining structure is a composite structure built in load bearing Brick masonry walls and Timber Column – Beam frame. The temple was commissioned by Jijabai – mother of Shivaji Maharaj. Nageshwar Mandir - Built in 1740 - 1761 ( 270 years old ) – Ground + 1 Upper floor – The main temple is in Stone masonry and the Sabha-mandap is built in Timber Column – Beam frame. Nageshwar temple is considered as one of the oldest temples of Pune and it has beenthere since the times of Sant Gyaneshwar and Tukaram. One can notice that the main shrine has the typical Yadava structure with a stone roof. Several renovations and additions have been made to the temple over the years.This delightful temple was built in 1730   Nageshwar Temple  – Pune Pune University - Main Building  – Built in 1864 - 1871 ( 140 years old ) – Ground + 1 Upper floor building with a central 100 feet high flag tower – A load-bearing Stone masonry and composite stone and brick masonry structure. Part of the structure timber-framed structure with pitched clay tile roof and brick masonry walls.  Originally used as a Governor’s Residence Panch-haud Mission Church – Built in 1835 ( 176 years old ) – The entire premise comprises of three structures , the Main Church, Residence of Parish Priest & 135 feet high Bell Tower. The Bell tower is marvellous piece of Brick Masonry load bearing structure. Mahatma Phule Mandai ( Mahatama Phule Vegetable Market )  - Built in @ 1885. Mandai officially known as Mahathma Phule Mandai is the biggest vegetable market in Pune City, India. Council Hall - A grade I heritage structure also known as “Vidhan Bhavan” was built in 1870. The building is significant as it was here that the first session of the then Bombay legislative assembly was held -- on July 19, 1937. The first session of the Bombay legislative assembly after independence was also held here -- on September 10, 1947. The Sardar Dastur Hoshang Boys’ High School - Established in 1912, is situated at the centre of the Dastur Schools Campus, camp Pune. – Ground + 1 Upper - A load-bearing Stone masonry structure St Helena School pune - The Anglo-Indian Christian minority school, which is an all-girls' school, was started by Susie Sorabji in 1908, located in Pune Cantonment – Ground + 1 Upper - A load-bearing Stone masonry structure

Based in Maharashtra (India), the company is engaged in lending accurate Construction Material Testing Services to the clients. Our testing laboratory is well-equipped in order to test Cement, Concrete, Steel, Aggregates, Bricks, Concrete blocks, Paving Blocks, Construction Chemicals, accelerated curing of concrete, etc. The lab offers state-of-the-art mix designs for normal concrete, pumpable concrete, high strength concrete, high early strength concrete, high performance concrete, self-compacting concrete, etc. our lab is featured with advanced and modern test set-up such as, fully computerized Universal Testing Machine and Fully Computerized Automated rate of loading controlled Compression Testing Machine, Concrete Pan Mixer, Temperature Controlled Curing Tanks along with all other test equipments.  The lab is also equipped with a temperature and humidity controlled cement test facility. We conduct CDC Lab Testing, Cement Testing Lab and Electronic Compression Testing.

We are located in Maharashtra (India) and engaged in offering trustworthy Forensic Engineering Consultancy services to the clients. Our professionally trained staff having expertise in the failure investigation & Forensic Engineering is dedicatedly involved in the procedure of carrying out numerous failure investigations & Forensic Engineering projects. Some of our projects include RCC Silo Collapse, full or part collapse of buildings structures, ground water reservoirs, overhead water tanks, conveyor belt supporting steel structures and fire damaged buildings. We provide services for Building Elevation Treatment on the Verge of Collapse, Dome Slab Collapse of Overhead Water Tanks, Fire Damaged Commercial Building, Ground Level Service Reservoir Wall Collapse, Residential Building Parking Column Crushed Concrete and Severe Structural Cracks in RCC.

Based in Maharashtra (India), the company is engaged in delivering reliable services for Structural Audit & Structural Stability Certification . As per the rules laid by government, all factories and residential societies are expected to undergo assessment and obtain a structural stability certificate from a chartered civil engineer in a period of every 5 years. We provide such certification with ease to the clients. Our services include detailed inspection, assessing the strengths & weakness of the structure, conducting NDT, preparing repair rehabilitation scheme, monitoring repair work and issuing Structural Stability Certificate. Why Structural Audit Is required? The Structural Audit is a process of assessing the present health of structure, identifying the loads & forces acting on the structure, identifying the effects of these loads and forces and finally assessing the stability & safety of the structure to withstand for its remaining life. The structural stability is affected by number of reasons such as Aging, Construction Quality, Exposure condition, External forces etc. If the structural audits are carried out on regular intervals of @ 5 years, it helps to identify the problems in the initial stage. After structural audit, If the required repairs Rehabilitation and preventive maintenance is carried out regularly, it substantially reduces the overall maintenance repair cost of the structure. Stitch in time saves nine   Structural Audit Is Carried Out For : As a statutory requirement:- After every 5 years as per Inspector of factories After 30 years at every 5 years as per Municipal Act After 15 years at every 5 years and after 30 years at every 3 years as per Co-operative society  Act For Insurance For Bank – Mortgage For Valuation Structure showing Distress Proposed Additions, Alterations, Extensions  in building structure For Damage assessment due to earthquake, fire, blast, vibration, corrosion, etc.   Our Services Include : Visual Survey Visual inspection of individual building structures from inside and outside and to study presents status of different structural members. Study of Architectural RCC Structural drawings ( If available ) Photographic Survey Noting various observations such as Load transfer system, Structural framing system, Structural deficiencies, Settlement if any, Cracks in RCC members,   Cracks in masonry plaster, Leakages,   Loads on structure,   Defects in non structural elements etc. Identification of broad areas locations in the structure requiring further detail investigation and for conducting various ND Tests Non Destructive Evaluation : To Conduct Non Destructive tests as required in detail visual survey Repair & Rehabilitation Consultancy : To prepare detail report of visual inspection & various ND tests Interpretation of ND test results. Diagnosis & Root cause analysis of the problems observations To prepare Repair & Rehabilitation scheme to make structure durable, healthy and to stand for a long life. Prepare technical specifications & draft tender document for repair and rehabilitation. Prepare detail estimate for the same. Scrutinize the tender documents. Periodically visits to inspect the work Issue Structural Stability Certification after completion of entire job.

Based in Maharashtra (India), the firm is acknowledged for lending accurate Rebound Hammer Testing services to the clients. This test is used for checking the strength of concrete since 1940. The test is based on the principle that the rebound of an elastic mass depends on the hardness of the surface against which mass strikes. The plunger of hammer is strongly and steadily pressed against the concrete surface at right angles until the spring loaded mass is triggered from the locked position. The spring controlled mass rebounds and the extent of such rebound depends upon the surface hardness of concrete. The distance traveled by the mass as a percentage is defined as rebound number.   Influence of Test Conditions : The test is significantly influenced by following factors : Type of Cement : Concrete made with high alumina cement can give strength 100 % higher or that with supersulphated cement can give 50 % lower strength than that with ordinary Portland cement. Type of Aggregate : The influence of aggregate type and proportion can be considerable. Surface condition & Moisture content : Trowelled & floated surfaces are harder than moulded surfaces. Exposed aggregate surfaces are unsuitable for this methods. A wet surface will give rise to underestimation of strength of concrete by about 20 % lower than calibrated under dry condition. Curing & Age of concrete : The relation between hardness and strength varies as a function of time, subsequent curing and exposure condition will further influence this relationship. But this effect can be ignored for concrete up to 3 months old. Carbonation of Concrete surface : Concrete exposed to atmosphere will normally form a hard carbonated skin. The strength predicted for carbonated concrete may overestimate up to 60 %.   Application : The rebound hammer method may be used for Assessing the likely compressive strength of concrete with the help of suitable calibration charts. Assessing uniformity of concrete Assessing the quality of concrete in relation to specified standard requirements. Assessing the quality of one element of concrete to another.   Reliability & Limitations : The test determines the hardness of the surface only . The impact of hammer is sensitive to the surface layer of about 25 to 50 mm only. The reliability of this test as alone, for compression strength is less, but it can generally indicate uniformity of concrete.   The rebound hammer results are very sensitive to the spring constant, thus after a use of hammer for about 15000 impacts, it is recommended to calibrate the hammer on Anvil.   The influence of aggregate type and proportion can be considerable. Thus it is strongly recommended that every lab, NDT consultant using rebound hammer shall develop their own graphs for compressive strength verses Rebound number, and shall not use blindly, the graphs given by manufacturers.   The probable accuracy of prediction of concrete strength in laboratory level is ± 15 % and that of structure is ± 25 %. It is recommended to use of Rebound hammer along with ultrasonic concrete testing or core test.

We are involved in providing accurate services for Underwater Inspection . Located in Maharashtra (India), we provide these services for structures like Dams, Bridges, Water Tanks, Effluent & Water Treatment Plants, Jetty and various Underwater Structures. We got professional underwater cameras that offers clear images and video clips. Our Underwater Inspection services are highly cost-effective. Our services include Corrosion of Underwater Structures captured by Camera, Inspection of Jetty & Bridge Foundations by Underwater Camera and Underwater Structure Inspection.