Papers and laboratory tests
Papers and presentations by our engineers, many of them on jobs described on this site, each marked with where it stands: published, presented, submitted or written for publication. And the tests that IIT laboratories have run on our grouts.
Papers and presentations
What our engineers have written
Newest first. Published papers link to the publisher where there is a link; ask us for a copy of any of the others.
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Climate Change and Soil Resilience: A Critical Appraisal on Innovative Techniques for Sustainable Ground Improvement and Ecosystem Protection
J. Naskar, A. K. Jha and T. N. Singh (IIT Patna), with Sanjay Aeron (Geo Constech)
Journal of Hazardous, Toxic, and Radioactive Waste, 29(4), ASCE, October 2025
A review, written with IIT Patna, of newer ground improvement techniques and how they serve soil resilience and ecosystem protection as the climate changes.
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Mitigating differential settlement in ballastless tracks at embankment–bridge transition zones using polyurethane grout
J. Joshi, S. Mathew and Sanjay Aeron (Geo Constech), with Northern Railway
Written in 2025; to be submitted to a journal
Ballastless track on the USBRL, laid partly on rock and partly on a reinforced-earth (MSE) slope, settled at an embankment–bridge transition. The paper traces the cause to the difference in stiffness between the two, and sets out how PuTeRA polyurethane injection, followed by cement grouting, lifted the loop and main lines back to level.
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Strengthening dams from within: advanced grouting for dam safety and longevity
Presented by J. Joshi (Geo Constech)
Dam Safety Conference 2025, Dam Safety Society, Shimla, March 2025
Grouting in dam rehabilitation: the problems it treats, from seepage and cracked joints to weak foundations, how cement and chemical grouts compare, and four of our case studies, from a leaking headrace tunnel and a hydro tunnel face to a railway track and the Kolkata High Court.
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Sinkage control of North-West corner of Kolkata High Court by consolidation grouting and stabilization using DrucStone chemical grout: a case study
T. Gupta (Geo Constech)
Journal of Building Pathology and Rehabilitation, 5:27, Springer, 2020
How settlement of a heritage building on soft ground near the Hooghly was measured and arrested with micro-piles and DrucStone consolidation grouting.
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Controlling water incursion in Parsik tunnel in Mumbai using chemical grouting of DrucHyd-2C
T. Gupta (Geo Constech), with Central Railway
Tunnelling Asia 2019, Tunnelling Association of India, Mumbai, February 2019, pp. 155-162
The leaking brick-lined stretch of the 1916 Parsik tunnel, and the DrucHyd 2C injection through self-drilling anchors, in traffic blocks, that brought the dripping under control.
Conference proceedings; copy on requestParsik tunnel, Thane–Kalyan →
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Water control, drainages and grouting
A. Kainthola, S. Panthee, N. Madhubabu, K. Kumar and Sanjay Aeron (Geo Constech)
Seminar on construction solutions through specialty chemicals, Active Himalaya, Dehradun, April 2017
Why water weakens the rock around a tunnel, why cement grout struggles against heavy inflow under pressure, and how DrucHyd 2C injection consolidated a water-charged shear zone on the USBRL and treated seawater ingress in a micro-tunnel at Pipavav.
Copy on requestUSBRL tunnels T-1, T-3 and T-5, Katra →Micro-tunnel pit, Pipavav →
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Use of DrucHyd-2C (polyurethane) grout in Himalayan tunnelling
N. Madhubabu (Geo Constech), A. Kainthola (NIT Srinagar, Uttarakhand) and T. N. Singh (IIT Bombay)
INDOROCK 2016, 6th Indian Rock Conference, IIT Bombay, June 2016
Tunnel T-5 on the USBRL: a water-charged shear zone where cement grouting had failed, consolidated with DrucHyd 2C so that excavation could resume.
Conference proceedings; copy on requestUSBRL tunnels T-1, T-3 and T-5, Katra →
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Prediction of compressive strength and elastic modulus of carbonate rocks
N. Madhubabu (Geo Constech), with P. K. Singh, A. Kainthola, B. Mahanta, A. Tripathy and T. N. Singh (IIT Bombay)
Measurement, 88, 202-213, Elsevier, 2016
Predicting the compressive strength and stiffness of carbonate rocks from simple index tests such as porosity and ultrasonic velocity; a neural network predicted them better than regression.
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Role of chemical grouting in the Himalayas and rehabilitation of old structures
N. Madhubabu and S. Panthi (Geo Constech), A. Kainthola (NIT Srinagar, Uttarakhand), T. N. Singh (IIT Bombay) and Sanjay Aeron (Geo Constech)
Five chemical grouting case studies, from water entering a coal chamber at the Rosa power plant and a micro-tunnel at Pipavav to hydro and USBRL tunnels, with laboratory tests on sand treated with DrucStone for the foundations of old buildings such as the Kolkata High Court.
Copy on requestMicro-tunnel pit, Pipavav →USBRL tunnels T-1, T-3 and T-5, Katra →Rosa Thermal Power Project →Kolkata High Court →
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Challenges and water control in Himalayan tunnelling
N. Madhubabu and M. Shekhar (Geo Constech)
The geological surprises of tunnelling in the Himalayas, how water weakens the rock mass, and the DrucHyd 2C pre-excavation grouting that let excavation resume through a water-charged shear zone on the USBRL.
Copy on requestUSBRL tunnels T-1, T-3 and T-5, Katra →
Independent laboratories
Our grouts, tested by others
Tests run by IIT laboratories on soil treated with our grouts. Each result holds for the soil and the dose tested, not for other ground.
Triaxial and UCS tests on site soil
Soil from the Badi Patan Devi heritage site treated with our PU grout at 5% of dry weight: unconfined compressive strength from 148 kPa to 3,284 kPa; cohesion from 45 kPa to 560 kPa. Results for that soil only.
DrucPietra 2C on silty sand
Testing to ASTM procedures at a 5% chemical dose recorded a strength increase of more than 475% in the treated silty sand.
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