Mobile Bridge Inspection Unit (MBIU)

The Mobile Bridge Inspection Unit (referred as MBIU) is an Electro-mechanically driven Articulated Structure mounted on a vehicle (a truck) as an aid towards proper inspection of bridges or similar infrastructures by enabling an inspection team of 3-4 persons carrying instruments access to the underside of bridge decks over flowing rivers or gorges.
Utilization of Municipal Solid Waste (MSW) in Road embankment

About 65-75% of segregated Municipal Solid Wastes can be used for embankment construction.Leachate studies indicate that MSW is a non hazardous material as concentration of heavy metals is within the permissible limit.Typical design cross sections have been arrived for 3m and 5m height MSW embankment.
Patch Fill-Pothole Repair Solution for Bituminous Roads

Patch-fill solution is useful for faster filling of potholes in bituminous roads without causing any environmental pollution and hindrance to roads users. Potholes filled by Path-fill shall be long lasting.
India hails success of first ‘steel-slag road’

A stretch of six-lane road experimentally paved with slag from steel-making in India has been shown to weather the beating from thousands of heavy trucks even though the surface is 30% shallower than that of roads paved with natural aggregates. Slag is made up of impurities melted out of the ore during the steel-making process. The trial, guided by the Central Road Research Institute (CSIR-CRRI) and sponsored by ArcelorMittal Nippon Steel (AM/NS).

Physical Model (Static) Load Testing Facility for Soils and other Industrial wastes

Instrument Details

Make: Fabricated at CSIR-CRRI in compliance with relevant ASTM standards

Model: Indigenously developed

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Specifications

Rigid loading frame with a maximum load capacity of 100 kN
Soil tank designed to accommodate prepared test beds
Can be used for soils and other geomaterials, including industrial waste load carrying capacity
Hydraulic jack system for controlled application of vertical load
Load cell for accurate measurement of applied load
Linear Variable Displacement Transducers (LVDTs) for precise measurement of surface settlement
Stable reaction arrangement to ensure uniform load transfer

Working Principle

The static plate load test is conducted in accordance with ASTM D1196, in which incremental vertical loads are applied to a rigid plate placed on the surface of the prepared soil. The load is applied using a hydraulic jack and transferred through a rigid loading frame, while the resulting surface settlements are measured using LVDTs. The applied load and corresponding settlements are recorded continuously to generate load-settlement curves, which are used to evaluate the load-bearing capacity, stiffness, and deformation characteristics of unbound soils and ground-improved systems under static loading conditions.

Applications

The facility is used to determine the load-bearing capacity of unbound soils and to evaluate the settlement and stiffness characteristics of foundation materials. It supports performance assessment of ground improvement techniques and enables comparative studies of treated and untreated soil beds. The setup is also suitable for model-scale investigations related to shallow foundations, pavements, and embankment bases, aiding reliable geotechnical design. User Instructions

Prepare soil or ground-improved layers to the target density and moisture content
Specify plate size, target load levels, and loading sequence prior to testing
Ensure proper levelling and seating of the loading plate
Allow sufficient time for settlement stabilization at each load increment