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Steel is perceived to corrode in soil. Will Reinforced Earth be suitable for constructing permanent highway structure? What about its long term durability?

All major building materials developed over the last century have employed steel to carry tensile loads.

These include reinforced concrete, prestressed concrete and for the last 35 years Reinforced Earth. Steel remains the only material used to resist heavy tensile loads in civil engineering works due to its toughness, high elasticity, durability and hardness. Steel will corrode in soil and its rate differs based on the chemical and electrochemical properties of backfill.

Tests are carried out for specific backfill and foundation soil and accordingly accounted in the design by:

(i)Excess thickness of strips is “sacrificed" to corrosion and the sacrificial thickness is not included in the design calculations for assessing structural integrity and safety. Therefore, loss of the thickness has no effect on the strips capacity to carry loads and their safety.
(ii)The strips are protected by hot-dipped galvanization. This guideline is provided in all leading international codes of practice including the BS 8006 : 1995 for "Strengthened / Reinforced soils and other fills " and in MORT&H publications "Specification for roads and bridge works " published by Indian Roads Congress.
What are the foundation requirements of Reinforced Earth structures?

Reinforced Earth is an internally stabilised flexible structure. Hence, it has a high ability to resist high dynamic and static loads and foundation movements /settlements. No special treatment is required in normal cases except for excavations upto a minimum depth based on site and codal provision requirements. PCC leveling strips footing is underlain, over which the panel courses are erected. Flexibility of the facing is achieved by the use of discrete precast concrete facing elements comprising of 1.5m x 1.5m (nominal) panels. The 20mm joints between panels allow movement between adjacent panels to occur without causing structural damage to the facing. Based on the facing panel arrangement, longitudinal differential settlements of the order of 1% or 100mm every 10m can be accommodated.

However, Special ground improvement programs need to be taken up in cases, where the structure is being built on foundations of low shear strengths or where high differential or total settlements are expected.
What are the details of Vehicle Parapet and Support structures on Reinforced Earth structures?

Vehicle containment of highway structures are provided by impact barriers or parapets located at the edges of the structure. The Reinforced Earth structure with Reinforced Cement Concrete panels as fascia is designed for structural stability against full - impact loading of commercial vehicle. The choice of the parapet and barrier, however, is left to the consultant or the owner based on project specific requirements. The standard details accepted worldwide catering to full-impact loading from commercial vehicles involves parapet mounted on capping beams supported by an in-situ reinforced concrete friction slab. This anchor slab is designed to resist loads arising from vehicle collisions with the parapet. Full scale impact tests have been conducted on parapet and the support structures with minimum length of reinforcing strip elements within the structure. Based on these tests, standard details specific to Reinforced Earth structures have been prepared. However, it is not possible do design block-face Reinforced Earth Structures against impact loads.
Is Reinforced Earth India is an approved Design, Supply and Supervising Company for Reinforced Earth works?

The Reinforced Earth India is an ISO: 9001:2000 certified company for "The Structural design, procurement and supervision of installation for Mechanically Stabilized Earth and Prefabricated Concrete Arch Structures for overpasses, underpasses, interchanges and other similar applications".

Reinforced Earth India is a bona fide and approved vendor of NHAI, MORTH, MSRDC, PWDs and various other Government and private bodies.
Is Reinforced Earth Structure a cost effective solution?

Reinforced Earth, when compared with conventional retaining structures, is economical solution. The cost effectiveness depends on the geometry of the structure and the use of backfill soil. Hence, the economic position can only be determined for a specific project. The cost effectiveness increases when the height of the structure is more, e.g. if for 2m high structure, Reinforced Earth is cheaper by 15%; then for 4m high structure, the cost would be 20% cheaper than conventional retaining structures and so on.
Is Reinforced Earth Structure an eco-friendly solution?

“Reinforced Earth” is a sustainable technology. In Reinforced Earth Structures, we use thin panels (usually not more than 180mm, nominal), which consumes less concrete. It is also noteworthy that very less excavation is required during construction; this minimizes the use of machineries at site. Overall, it reduces the emission of CO2, SO2 and other ill-elements in the environment, hence does not add significantly to the climate change as compared to conventional structures.
Do Reinforced Earth structures require maintenance during its Service life?

Like any civil engineering structures, Reinforced Earth structures too require a regular monitoring and maintenance program.

We run a regular inspection and maintenance program for all our completed projects and have a system of maintaining records of the performance of the structures. On request, these performance records are made available to concerned project owner(s) / operator(s).

Preventive and corrective actions are taken-up jointly with the project owners(s) / operator(s) during construction and post - construction stages.
What is the model of working Reinforced Earth India follows in a project?

Reinforced Earth India normally operates in two models; one is Engineering Procurement and Supervision (EPS) and Engineering Procurement and Contracting (EPC).

In EPS model, Reinforced Earth India provides design, construction drawings, requisite moulds for precasting of panels, supply the soil reinforcing elements and all permanent accessories as per the technical specification including technical guidance during precasting and installation of the structure. In this model, the general contractor takes up the responsibility of all relevant civil works including design and implementation of Ground Improvement, if required.

In EPC model, Reinforced Earth India takes up the responsibility of precasting and installation of the structure in addition to the above scope. However, concrete and HYSD steel of specified grade are supplied by the general contractor including design and implementation of Ground Improvement, if required.
What are the applications of TechSpan® arches and Techbox® structures®?
TechSpan® Arches and Techbox® structures are prefabricated Reinforced Cement Concrete products engineered to meet modern construction requirements of timely project completion and cost effectiveness. These structures are most commonly used as vehicular under passes, Pedestrian/ cattle underpasses, minor bridges, culverts etc.

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Reinforced Earth India, is global networked company with principal office in Paris. Through its subsidiaries in over 70 countries, Reinforced Earth (Terre Armee Internationale),
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