DEPARTMENT OF CIVIL ENGINEERING

Indian Institute of Technology Bombay

Lab Equipments :

DST - FIST Funded Central Facility

Pneumatic Cyclic Unsaturated Triaxial System: GCTS USTX-050

Working Principle:

The GCTS USTX-050 Pneumatic Cyclic Unsaturated Triaxial System is ideal for performing conventional triaxial tests, specifically, Strength (UU, CU and CD), Consolidation and Permeability tests on a sample (viz., soils), at high confining pressures (2 MPa). The setup is also equipped with a volume change measurement device, porous stones and flushing units, which can facilitate experimentation in unsaturated state of the soil.

The Unsaturated measurements work on the principle of Axis translation technique, i.e. elevating pore-air pressure while maintaining pore-water pressure at a reference value (or vice-versa) through the pores of a saturated high air-entry (HAE) material, thus affording direct control of matric suction. Drainage from the specimen is allowed to occur through the HAE pores until there is negligible volume change. Several increments of air pressure may be applied to generate required matric suction values.

Technical Specifications:

  • 10 kN axial load capacity
  • 2000 kPa confining pressure capacity
  • Sample dimension of 70 mm diameter and 150 mm height can be tested

Special Features:

  • Automatically performs saturation, consolidation & shear stages
  • Static & dynamic loading (Frequencies up to 5 Hz)
  • Double cell wall construction for accurate overall volume change measurements
  • Fully integrated system with multi-directional automatic valves: volume change & diffused air flushing devices.
  • Direct control/measurement of pore water pressure (uw) at top/bottom of the specimen and pore air pressure (ua) at the top of the test specimen
  • Stress/strain path controlled tests can be conducted

Applications:

  • Strength testing:
  • Saturated/Unsaturated Triaxial shear (UU, CU, CD); Constant water content (CW); Unconfined compression (UC); Hollow cylinder (HC) with compression, torque, or combination
  • Cyclic triaxial tests
  • Liquefaction, Resilient Modulus, Cyclic Strength
  • Volume change and Compressibility
  • Determination of drying/wetting Soil-Water Characteristic Curves (SWCC); 3-D, multi-stage consolidation, Response to wetting (swell/collapse)
  • Seepage & Permeability
  • Hydraulic conductivity and permeability of water or air (ksat, kw, ka) with suction control

Publications using data from this facility:

  • Nil

Minutes of User Committee meetings:

  • Nil

Central Facility Workshop Presentation:

  • *******Submission of Samples****************

1. Instructions for sample preparation/submission

The sample should be prepared as per the dimensional specifications mentioned above. The mold required for sample preparation can be availed.

2. Instructions for Users

The equipment operation will be allowed only for professionals with prior experience or those who have received enough training to work with this equipment.

3. Instructions for Registration

Prior permission has to be taken from the In-charge of the equipment. The number of samples that can be submitted through each registration is restricted to one. The mode of operation (viz., frequency in dynamic testing, stages of loading in consolidation test, etc.) and the parameters that have to be recorded have to be mentioned clearly in the registration/requisition form.

I) Internal Users:

Users within IIT Bombay can apply from http://drona.ircc.iitb.ac.in. The form should be completely filled up and all the sample details must be provided in the requisition form. Users need to be present at the time of experiment on the allotted appointment date/time. If a user wishes to change his/her time slot, an email should be sent well in advance, requesting change in appointment.

II) External Users:

    Academic Institutions:One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

    National R & D Lab’s: One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

    Industry& Non- Government Agencies: One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

You are requested to mention in your request letter that “We agree to acknowledge the FIST (Civil Engineering) – GCTS USTX-050 Pneumatic Cyclic Unsaturated Triaxial System Facility of IIT Bombay when the data from this is used in our papers/reports/thesis”.

The information on such acknowledgements with appropriate reference should be communicated to Environmental Geotechnology lab by e-mail. Kindly send the complete publication reference (Journal name/volume number/names of the authors/date of issue of the publication etc.).

Testing Charges: As per Institute/ DST norms.

******Facility Management Team**********

Name of the In-Charge (s) with designation

Dr. D. N. Singh
Professor
Department of Civil Engineering
IIT Bombay, Powai, Mumbai-400076

Contact Details:

Email: dns@civil.iitb.ac.in
Phone: 022-25764317

Location of the Equipment:

Environmental Geotechnology Lab
IVth Floor VMCC
Department of Civil Engineering
IIT Bombay, Powai,
Mumbai-400076.

Dantec3D Stereoscopic Particle Image Velocimetry (PIV)

Working Principle:

3D stereo PIV measurements are based on the same fundamental principles as human eyesight; i.e. stereovision. "When we look at given object, our left and right eyes see two similar but not identical images. The brain compares the two images and interpret the slight variations to re-build the 3-dimensional information of the object observed." Similarly, a Dantec Dynamics Stereo-PIV system measures particles displacements using two CCD- / CMOS- cameras:

  • Each camera plays the role of the human eye, looking at the flow field from different angles
  • The software plays the role of the brain, relating the observed (2 x 2D) displacements to 3D displacements.
  • Excellent 3D stereo PIV measurements can be performed with camera viewing angles of ±30o. For each 3D-vector, so-called "true" 3D-displacements are extracted from a pair of 2D-displacements. This numerical problem consists in solving 4 equations with 3 unknowns using a least squares methodology.

Technical Specifications:

Laser Source (with intra-cavity safety shutter) with light sheet formation optics:

  • Lamp Pumped, Q-switched, double pulsed Nd:YAG Lasers (Nd3+ ions are incorporated in a YAG (Yttrium, Aluminum, Garnet) crystal).
  • The Nd:YAG rod is pumped by a noble gas filled flash-lamp driven by a stabilized solid state power supply.
  • Laser wavelengths: 1064nm which is converted to visible 532nm laser light by a Harmonic Generation Assembly (HGA).
  • Pulse duration: 4 ns
  • Incoming beam: Slightly diverging or collimated
  • Maximum output: 1200 mJ
  • Operational temperature range: 5oC - 40oC (non-condensing)
  • Storage temperature range: 5oC - 45oC
  • Coolant: de-ionised water
  • Weight of system (80X11): 18 kg

Two Charged Couple Device (CCD)-cameras with frame grabbers (FlowSense EO 4M)

  • Double shutter two images with 600 ns min. inter-framing time
  • Resolution (hXv): 2048 pixel X 2048 pixel
  • Bit Depth: 8, 10, 12 (14 sing.) bits
  • Minimum Exposure time: 10 micro-sec
  • FPS (full frame): 16/20
  • Pixel size: 7.40 microns
  • Two stereo (Scheimpflug) camera mounts

Calibration Target

  • Dot matrix, single level with dimensions 450mm x 450mm

iv. 3D Traversing Mechanism

  • X-, Y-, Z- range: 1010 mm
  • Calibration factor: 320 pulses
  • Velocity range: upto 25 mm per second
  • Motor: 160 Ncm including Electromagnetic brake

v. Software: Dynamic Studio 2015a (supplied with Dantec PIV, works only with registered Dantec dongle)

Special Features:
  • Non-intrusive, planar or volumetric technique
  • Velocity range: 0 to supersonic
  • Two or three velocity components can be recorded simultaneously
  • Measurement areas range from smaller than 1 mm2 up to bigger than 1 m2
  • Snapshots of flow-fields can be acquired
  • Instantaneous velocity vector maps in a cross-section or volume of the flow
  • Statistics, spatial correlations and other relevant data are available
  • Results are similar to computational fluid dynamics, i.e. large eddy simulations.
  • Flexible beam delivery and sheet forming optics
  • Combination of techniques, multi-parameter laser imaging
  • Flexible definition of image acquisition sequences including delays, trigger bursts and synchronizing to external events.
  • 2D and 3D visualization of image data, combination of vector data and images, extraction of profiles, user defined color lookup tables, variable color resolution and zoom function.
  • Smoothing and many other filter operations for image and vector data (Gauss, Laplace,..).

Applications:

PIV finds applications in various fields, viz, Aerodynamics & Aeroacoustics, Automotive, Biomedical Engineering, Combustion, Electronic components, Hydrodynamics & Hydraulics, Materials Research, Mechanical Engineering, Micro-fluidics, Mixing, Process & Chemical Engineering, Sprays, Thermal Comfort and Wind Engineering.

5.Publications using data from this facility This facility is just operational. Hence no publication.

6. Minutes of User Committee meetings NA

7. Central Facility Workshop Presentation NA

*******Submission of Samples****************

1. Instructions for sample preparation/submission

  • Experiments should be discussed with PI/TA and the facility in-charge before proceeding.

2. Instructions for Users

  • Bring a new blank C.D. for copying the images. USB drives are strictly not allowed due to virus threat.
  • Avoid eye and skin exposure to direct or scattered radiation. Use protective eye wear all the time when operating the laser.
  • Wear clothes and gloves which cover arms and hands to avoid skin damage when handling in the optical path.
  • While working with lasers do not wear reflective jewelry like watches and rings, as these might cause accidental hazardous reflections.
  • Operate the laser at the lowest beam intensity possible.
  • Dantec system include devices which are equipped with delicate lenses and CCDs (scientific camera system). To reduce repair costs and downtimes and to increase the reliability and lifetime of your system it is extremely important to keep the optics clean and free from dust.
  • Do not scratch or rub on lenses.
  • 3. Instructions for Registration

    I) Internal Users:

    Users within IIT Bombay can apply from http://drona.ircc.iitb.ac.in. The form should be completely filled up and all the sample details must be provided in the requisition form. Users need to be present at the time of experiment on the allotted appointment date/time. If a user wishes to change his/her time slot, an email should be sent well in advance, requesting change in appointment.

    II) External Users:

      Academic Institutions:One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

      National R & D Lab’s: One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

      Industry& Non- Government Agencies: One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

    You are requested to mention in your request letter that “We agree to acknowledge the FIST (Civil Engineering) – Dantec3D Stereoscopic Particle Image Velocimetry (PIV) Facility of IIT Bombay when the data from this is used in our papers/reports/thesis”.

    Testing Charges: As per Institute/ DST norms.

    ******Facility Management Team**********

    Name of the In-Charge (s) with designation
    Prof. Eldho T.I.,
    Institute Chair Professor, Dept. Civil Engineering, IIT Bombay
    Contact Details: email, phone,
    fax: eldho@civil.iitb.ac.in; phone; 7339

    Location of the Equipment: Hydraulics Laboratory, IIT Bombay

    Rheometer for Cementitious paste

    1. Working Principle:

    A Rheometer measures flow. More specifically, rheometers measure the forces (like shear) associated with a flowing substance. Typically, the flowing substance is much thicker than a liquid (like concrete). A rheometer does not simply measure flow, but also measures the effects of flow at different pressures-especially key characteristics of the flow like shear (how difficult it is to change the flow) or how the flow of a substance tends to drag surrounding materials. The output of a rheometer is typically a set of curves that depict these forces as the pressure on the flowing material changes. Rheometers are almost as varied as the substances and forces that they measure.

    2. Technical Specifications:

     
    Technical Data
    Unit
    MCR 102
    Bearing

    Air
    EC motor

    Yes
    Maximum torque
    mNm
    200
    Min. torque, rotation
    nNm
    5
    Min. torque, oscillation
    nNm
    7.5
    Angular deflection
    (set value)
    µrad
    0.5 (min)
    Min. angular velocity
    rad/s
    10-8
    Max. angular velocity
    rad/s
    314
    Max. speed
    1/min
    3000
    Min. angular frequency
    rad/s
    10-7
    Max. angular frequency
    rad/s
    628
    Normal force range
    N
    0.01-50
    Normal force resolution
    mN
    1
    Max. temperature range
    °C
    Up to to 100˚ C
    Direct strain controller
    -
    Yes
    Direct stress contoller
    -
    Yes



    3. Special Features:  capable of measuring the fundamental parameters (Yield stress) of rheology of cementitious paste, clay. Zero shear viscosity determinations on low-viscosity polymer solutions or measure highly viscous fluids/materials at high shear rates and strains,


    4. Applications: Cementitious Pastes, clay

    5. Publications using data from this facility : NIL

    6. Minutes of User Committee meetings :  NIL

    7. Central Facility Workshop Presentation : NIL


    *******Submission of Samples****************

    1. Instructions for sample preparation/submission: The sample should be prepared at the SEMT Lab, Civil Engg Dept., as per the instruction from the operator.


    2. Instructions for Users:  Cleaning of the instrument, accessory and measuring cell Pre and Post Measurement is the responsibility of the Applicant. The Operating range (Stress controlled/Strain Controlled) and shearing profile should be designed and fixed by the applicant.

    3. Instructions for Registration: Send an email to prakashn@iitb.ac.in

    I) Internal Users:

    Users within IIT Bombay can apply from http://drona.ircc.iitb.ac.in. The form should be completely filled up and all the sample details must be provided in the requisition form. Users need to be present at the time of experiment on the allotted appointment date/time. If a user wishes to change his/her time slot, an email should be sent well in advance, requesting change in appointment.

    II) External Users:

      Academic Institutions:One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

      National R & D Lab’s: One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

      Industry& Non- Government Agencies: One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

    You are requested to mention in your request letter that “We agree to acknowledge the FIST (Civil Engineering) – Rheometer for Cementitious paste Facility of IIT Bombay when the data from this is used in our papers/reports/thesis”.

    Testing Charges: As per Institute/ DST norms.


    ******Facility Management Team**********

    Name of the In-Charge (s) with designation :
    Dr. Prakash Nanthagopalan, Asst. Professor

    Contact Details: Email prakashn@iitb.ac.in

    Phone : 02225767323

    Location of the Equipment: SEMT LAB ( Structural Evaluation and Materials Testing Lab. )

    Compact-Rio


    1. Working Principle: Multiple-data Acquisition and Actuation in LabVIEW-based Programming Environment.

    2. Technical Specifications:

    Qty.
    Part No.
    Description
    1
    960901-01
    Bundle- CRIO 9082, High performance integrated system, 8-slot, LX150, RT, includes NI 9148 Ethernet Expansion chassis for C Series Modules.
    1
    779999-01
    CRIO-9074, Compact RIO controller & chassis integrated system, 400 MHz PowerPC controller, 2M Gate FPGA, 8-slots.
    1
    781787-02
    CRIO-9082, High performance integrated system, 8-slot, LX150, RT.
    2
    781398-01
    NI 9223, 4-Ch., +/- 10 V, 16-Bit, 1 MS/s, Simultaneous AI C Series Module for CompactDAQ and CompactRIO.
    1
    779781-01
    NI 9219 4Ch-Ch isolated, 24-Bit, +/- 60 V, 100S/s Universal AI module.
    1
    196720-01
    NI 9972 Strain relief kit for 6-pos spring terminal connector (qty 4)
    2
    779521-01
    NI 9237 4-Ch 50 kS/s per Channel, 24-Bit Bridge Analog Input Module.
    2
    196809-01
    NI 9949 RJ-50 (female) to Screw Terminal Adaptor (qty 4)
    3
    782000-01
    NI 9232 3-Chennel +/- 30 V, 102, 4 kS/s per Channel, 24-Bit IEPE Analog Input Module.
    7
    196375-01
    NI 9971 Backshell for 2-pos connector block (qty 4).
    3
    782802-01
    EMI Suppression Ferrite for NI 9232 (qty 1).
    2
    781098-01
    NI 9269 4-Ch Voltage output, +/-10V,ch-ch ISO
    1
    779987-01
    NI 9402 4-Channel, 50ns, LV TTL Digital input/output Module, Ultra high-speed digital I/O module for cRIO and cDAQ, BNC connectivity.
    1
    780112-01
    NI 9516 1 Axis Servo Drive Interface w/Dual Encoder Feedback
    1
    781093-01
    NI PS-15 Power Supply, 24 VDC, 5 A, 100-120/200-240 VAC Input
    1
    182219-05
    Type E1 Twisted-pair (10Base-T) Cable for GPIB-ENET, 5m.


    3. Special Features: Wireless-connectivity, Simultaneous Multiple Sensing/actuation, LabVIEW coding flexibility, Portable for field operations, Compact build-up, etc.  

    4. Applications: Structural Health Monitoring of Sandwich, Metallic and RCC Structures using PZTs, Strain-gauges, Accelerometers, Load-cells, Temperature-sensors, etc.

    5. Publications using data from this facility: NA

    6. Minutes of User Committee meetings: ….

    7. Central Facility Workshop Presentation: ……

    *******Submission of Samples****************


    3. Instructions for Registration

    I) Internal Users:

    Users within IIT Bombay can apply from http://drona.ircc.iitb.ac.in. The form should be completely filled up and all the sample details must be provided in the requisition form. Users need to be present at the time of experiment on the allotted appointment date/time. If a user wishes to change his/her time slot, an email should be sent well in advance, requesting change in appointment.

    II) External Users:

      Academic Institutions:One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

      National R & D Lab’s: One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

      Industry& Non- Government Agencies: One should come in person, a letter from the Guide/HoD on the Institution’s Original Letter Head along with the Registration Form stating that the experiment is for research purpose, to qualify for academic concession is a must.

    You are requested to mention in your request letter that “We agree to acknowledge the FIST (Civil Engineering) – Compact-Rio Facility of IIT Bombay when the data from this is used in our papers/reports/thesis”.

    Testing Charges: As per Institute/ DST norms.



    ******Facility Management Team**********

    Name of the In-Charge (s) with designation: Prof. Sauvik Banerjee, Associate Professor in Civil Engineering Department, IIT Bombay.

    Contact Details: Email: sauvik@civil.iitb.ac.in, Phone: +91 22-25767343, Fax: +91 22-25767343.

    Location of the Equipment: Structural Health Monitoring and Retrofitting Laboratory, Civil Engineering Department, IIT Bombay.

     

    Cyclic Triaxial Testing Facility for Soils and Pavement Materials

    Working Principle:


    The cyclic triaxial testing facility is a hydraulic oil based actuator system and the deviatoric loading on soil and bitumen samples are applied using hydraulic actuator, controlled through computer based software Geo-sys. Testing of samples can be done in stress and/or displacement controlled modes for both static and cyclic tests. Cell and back pressures are applied to samples by using air pressure control (APC: air/water interface). The in-situ stresses (both confining and deviatoric stresses), isotropic and anisotropic conditions on the specimen are simulated in the triaxial cell to study the behavior of soils under external loading. Conventional triaxial tests (UU, CU and CD) and cyclic tests on soil samples can be performed at confining pressures up to 1 MPa. The setup is also equipped with a volume change measurement device, B-value check and auto servo-valve, which will saturate the soil sample without user interference. A computer integrated measurement device is used to monitor the changes in the volume of sample during saturation, consolidation and testing of fully saturated soil samples.

    Technical Specifications:

    • 50 kN axial load capacity and ± 50 mm stroke length
    • 1000 kPa confining pressure capacity
    • Sample dimensions of 100 mm diameter and 200 mm height can be tested

    Special Features:

    • Automatically performs saturation, consolidation & shear stages
    • Static & dynamic loading (Frequencies up to 15 Hz)
    • Stress/strain path controlled tests can be conducted
    • Dynamic modulus, resilient modulus, flow time, flow number and fatigue tests of asphalt samples can be done
    • Conventional and user defined loading waveforms for cyclic loading tests

    Applications:

    • Static testing: Unconfined compression (UC) test, Saturated triaxial shear (UU, CU, CD) tests on soil samples
    • Cyclic triaxial tests on soil samples to understand the liquefaction potential, Resilient Modulus, Cyclic Strength of soils
    • Permeability tests
    • Asphalt testing: Dynamic Modulus and Resilient modulus tests on asphalt samples

    Publications using data from this facility
    Nil

    Minutes of User Committee meetings
    Nil

    Central Facility Workshop Presentation
    *******Submission of Samples****************

    1. Instructions for sample preparation/submission
    The sample should be prepared as per the dimensional specifications mentioned above. The mold required for sample preparation can be availed.

    2. Instructions for Users
    The equipment operation will be allowed only for professionals with prior experience or those who have received enough training to work with this equipment.

    3. Instructions for Registration

    Prior permission has to be taken from the In-charge of the equipment. The number of samples that can be submitted through each registration is restricted to one. The mode of operation (viz., frequency in dynamic testing, stages of loading in consolidation test, etc.) and the parameters that have to be recorded have to be mentioned clearly in the registration/requisition form.

    I) Internal Users:

    Users within IIT Bombay can apply from http://drona.ircc.iitb.ac.in. The form should be completely filled up and all the sample details must be provided in the requisition form. Users need to be present at the time of experiment on the allotted appointment date/time. If a user wishes to change his/her time slot, an email should be sent well in advance, requesting change in appointment.

    II) External Users:

    Academic Institutions: One should come in person, a letter from the Guide/HoD on the Institution's original letter Head along with the Registration Form stating that the experiment is for research purpose, to avail academic concession.

    National R&D Labs: One should come in person, a letter from the Head of the laboratory on the Institution’s original letterhead along with the Registration Form.

    Industry& Non-Government Agencies: One should come in person, a letter from the head of the agency along with the Registration Form.

    You are requested to mention in your request letter that “We agree to acknowledge the FIST (Civil Engineering) – UL 50-SH Servo-Hydraulic Cyclic Triaxial System Facility of IIT Bombay when the data from this is used in our papers/reports/thesis”.

    The information on such acknowledgments with appropriate reference should be communicated to Advanced Geotechnical Engineering laboratory by e-mail. Kindly send the complete publication reference (Journal name/volume number/names of the authors/date of issue of the publication etc.).

    Testing Charges: As per Institute/ DST norms.

    ******Facility Management Team**********

    Name of the In-Charge (s) with designation
    Dr. Dasaka. S. Murty
    Associate Professor
    Department of Civil Engineering
    IIT Bombay, Powai, Mumbai-400076

    Contact Details:
    Email ID: dasaka@civil.iitb.ac.in
    Phone: 022-25767316

    Location of the Equipment:
    Advanced Geotechnical Engineering Laboratory
    Near National Geotechnical Centrifuge facility
    Department of Civil Engineering
    IIT Bombay, Powai,Mumbai-400076