Construction Diagnostic Centre is a consultancy and construction material testing laboratory located in Pune, Maharashtra that offers non-destructive testing, quality control, and repair/rehabilitation consultancy services. It has over 50 years of experience in structural engineering, construction management, and architectural consultancy. The company provides a full range of civil engineering-related consultancy and testing services, and has an accreditation for testing building materials from NABL.

1. Pune, Maharashtra
Construction
Diagnostic Centre
We Qualify Structures

2. About Us
 We are a consultancy & a construction material testing
laboratory offering Non Destructive/ Material Testing
(NDT), Quality Control, & Repair / Rehabilitation
Consultancy services.
 An offshoot of a parent company viz ‘Ranade Consultants’,
a firm established in 1960, CDC draws on its vast and rich
experience in Structural / RCC / Project Management &
Architectural consultancy.
 We are the ONLY firm offering all civil engineering-related
Consultancy & Testing services under one roof.
 We enjoys an Accreditation from NABL (ISO – 17025) for
Non Destructive Testing and Mechanical Testing of Building
Materials.

3. Services Offered
 Our Head Office is located in the heart of Pune
city, with a Branch Office in Surat, Gujrat.
 We believes in continuous improvement through
on-going research and practice.
 we provides services for the evaluation and
condition assessment of existing structures,
including application of non-destructive, in-situ,
and load-testing methods for measuring existing
states of stress, material properties, structural
behaviour characteristics and material
uniformity.

4. Projects Completed
Airports, Dams, Tunnels, Bridges, Concrete
Roads, Jetties, Wind Mills, Earthquake / Blast /
Fire-damaged Structures, Commercial / Mass
Housing Projects, Educational Complexes,
Cement ,Soya bean, Chemical Sugar, Thermal
Power- Plants, Elevated Water Tanks, Reservoirs,
Bunkers, Silos, Effluent / Water Treatment Plants
and so on; in India as well as abroad.

5. Our Services
 Non Destructive Testing
 Construction Material
 Repair & Rehabilitation
 Heritage Structures
 Failure Investigation
 CIDC-Approved Retrofitting
 Corporate Training
 Concrete Quality Control
 Structural Audit And Structural Stability Certification

6. Load Test
 IS – 456 – 2000 recommends Load testing of
flexural members to be carried out In case the
core test results do not satisfy the requirements.
 Many a times Load test is carried out on building
& Bridge components when –
 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

7. Moisture Measurement
 Moisture is known to be one of the main
sources causing deterioration of masonry
and timber structures.
 To identify the source of leakages and
dampness moisture meters are very helpful.
 If the concrete, masonry, timber structures
are found to be wet, then appropriate repairs
can be carried out to avoid further decay
deterioration of the material and structure as
a whole.

8. Ultrasonic Pulse Velocity Test
 Construction Diagnostic Centre has a very wide
range of UPV machines with different frequency
& different sizes probes, capable of scanning
concrete up to 10 m wide.
 This is one of the most commonly used
methods, in which the ultrasonic pulses 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.

9. Half Cell Potentiometer And
Resistivity Meter
 The instrument 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 activity of the steel reinforcement
and the concrete leads them to be considered as
one half of weak battery cell with the steel acting
as one electrode and the concrete as the
electrolyte.
 The name half-cell surveying derives from the fact
that the one half of the battery cell is be the steel
reinforcing bar and the surrounding concrete.

10. Bore Scope Survey / Endoscopy
 Endoscopy surveys provide a fast, cost effective
means of identifying problematic / in-accessible 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
 Ceiling, roof and floor voids
 Water tanks
 Concrete or Masonry structures with large voids,
honeycombing etc..

11. Underwater Investigation
We carry out underwater inspection of structures like
 Dams
 Bridges
 Water Tanks
 Effluent & Water Treatment Plants
 Jetty
 Underwater Structures
Underwater camera
Underwater Structures
Corrosion of Underwater Structures captured
by Camera
Inspection of Jetty & Bridge Foundations by
Underwater Camera

12. Non Destructive Testing
 Construction Diagnostic Centre has 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 In-situ
strength of 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
Corrosion Mapping of reinforcement
 Pile Integrity Test – For assessing the Integrity,
Continuity & Depth of pile

13. Rebound Hammer Test
 This is the most common method adopted for
checking 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 pressed strongly and
steadily against the concrete surface at right
angles to its surface, until the spring loaded mass
is triggered from the locked position.
 The distance traveled by the mass as a
percentage is defined as rebound number.

14. Core Test And Core Cutting
 This is one of the very reliable tests adopted
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 chemical properties of concrete
specimen for its cement content, carbonation
depth, chloride and sulphate content may be
measured.

15. Rebar Locator And Bar Size
 The reinforcement bar is detected by
magnetising it and inducing a circulating
“eddy current” in it.
 After the end of the pulse, the eddy current
dies away, creating a weaker magnetic field
as an echo of the initial pulse.
 The strength of the induced field is
measured by a search head as it dies away
and this signal is processed to give the
depth measurement.
 The eddy current echo is determined by the
depth of the bar, the size of bar and the
orientation of the bar.
 This detection of location of reinforcement is
required as a pre process for core cutting.

16. Pile Integrity Test (Pulse Echo
Method)
 It has been established that cast in situ
piles in majority of the cases fail
because 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 developed while handling of
precast piles can also be a cause of
failure.
 If pile integrity can be assessed before
completion of pile caps, then this will go
a long way towards certification of pile
integrity

17. Vibration Measurement
 Structural vibration in buildings can be detected by the
occupants and can affect them in many ways:
 Their quality of life can be reduced as also can their
working efficiency.
 Ground borne vibration from sources such as blasting,
piling, machinery or road/rail traffic can be a source of
concern for occupants of buildings in the vicinity.
 This concern can lead to a need to assess the effect
of the imposed vibration on the building structure to
ascertain whether damage could occur.
 It is increasingly recognized that buildings must
sustain vibrations, and recognition of this is needed
 both in design for structural integrity, serviceability and
environmental acceptability, and in the preservation of
historic buildings.
 Measurement of vibration in a building is carried out
for a variety of purposes:

18. Ultrasonic Thickness Gauge
 Using the Ultrasonic thickness Gauge we can
find out the precise thickness of all such steel
metal structures, components.
 Ultrasonic Thickness Gauge a very useful tool
in the structural audit / survey.
 In most of the Industries, especially in
Chemical factories corrosion is a very serious
issue for the structural stability of the steel
structures, M S Chimney, Stacks, Gantry
girders, Pipe racks, Pipelines etc.
 Using the Ultrasonic thickness Gauge we can
find out the precise thickness of all such steel
metal structures, components.

19. 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.

20. Construction Material
Laboratory Testing
 Construction Diagnostic Centre laboratory is
well equipped to test for
 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.
 The Construction Diagnostic Centre lab has
advanced and modern test set-up such as, fully
computerized Universal Testing Machine and
Compression Testing Machine, Concrete Pan
Mixer, Temperature Controlled Curing Tanks
along with all other test equipments.

21. Repair And Rehabilitation
Consultancy
 In recent times, a large number of structures
are observed to be in a distressed condition.
 The structures may require repair /
rehabilitation due to –
 Poor quality concrete / workmanship
 Construction Deficiencies
 Design Deficiencies
 Severe Exposure Condition
 Corrosion
 Aging
 Damage due to Earthquake , Fire, Blast,
Vibrations etc.
 Settlement , Foundation problems.

22. Heritage Structures
Conservation Consultancy
 At CDC we have the core expertise in assessment of the
Heritage buildings. We have the most advanced Non
Derstructive Testing tools , including consultancy services
for structural conservation, strengthening & Retrofitting.
 We offered such services to following Heritage Structures /
Buildings –
 1) 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
 2) 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

23. Failure Investigation / Forensic
Engineering Consultancy
 At CDC we have a professionally trained staff
having expertise in the failure investigation &
Forensic Engineering.
 We have carried out various failure
investigations & Forensic Engineering for
number of projects like –
 RCC Silo Collapse
 Full or Part Collapse of Buildings / Structures
 Ground Water Reservoirs
 Overhead Water Tanks
 Conveyor Belt supporting steel structures
 Fire Damaged Buildings

24. Concrete Quality Control And
Audit
 We have developed a unique Quality
Control & Auditing Scheme for RCC
structures.
 We offer a Total Quality Solution for
concreting activity, which includes
Testing of all building materials,
 Monitoring concrete quality with NDT,
Orientation Lecture for site engineers
and tradesmen, quality control and
audit of concreting activity.
 CDC is known in construction industry
for “No compromise on Quality”

25. Structural Audit And Structural
Stability Certification
 According to Government regulations,
 All factories and residential societies are
expected to undergo assessment and obtain a
Structural Stability Certificate from a chartered
civil engineer, every 5 years.
 We are the competent authority to provide
such certification.
 We offer services including detailed inspection,
assessing the strengths & weakness of the
structure, conducting NDT, preparing repair /
rehabilitation scheme, monitoring repair work
and issuing Structural Stability Certificate.

26. CIDC Approved Retrofitting
Clinic
 Our laboratory is an approved “Retrofitting
Clinic” of Construction Industry
Development Council (CIDC – Established
by Planning Commission – Government of
India).

27. Corporate Training For
Construction Industry
 “CDC” has drafted short lecture / workshops
series for various Senior Engineers, Site
engineers, Archiects and Supervisors
working in construction industry

28. Contact Us
Construction Diagnostic Centre
 Contact Person: Mr. Ravi Ranade
 Mobile No: 9422007479
 Phone:+91-20-25432643
 Visit: http://structural-audits.com
 Address:“Kanchan Bhavan”, 5, Shilavihar
Colony.
 City: Pune- 411038
 State:Maharashtra (India)