Engineering Reference
Technical Reference & Specification Guide
Consolidated specifications and governing standards for crash barriers, perimeter security and geosynthetics — a single reference for engineers, consultants and procurement teams writing Indian infrastructure tenders.
The tables below summarise typical production-range values and the codes that govern each product family. Figures are indicative of standard supply; always confirm exact values against your project BOQ and the current MoRTH / IRC / IS revision named in the tender.
Road Safety
Crash Barrier Specifications
| Parameter | W-Beam | Thrie-Beam | Metal Beam / Highway |
|---|---|---|---|
| Profile | Two-corrugation W section | Three-corrugation section | Corrugated metal beam (W or Thrie) |
| Rail thickness | 2.67 – 3.00 mm | 2.67 – 3.00 mm | 3.00 – 4.00 mm (project-specific) |
| Post type | C / Z / Sigma section | C / Z / Sigma section | C / Z / Sigma section |
| Post spacing | 2 m standard / 1 m at curves & bridges | 2 m / 1 m at high-risk zones | 1 – 2 m per location |
| Galvanising | Hot-dip, 550 g/m² min | Hot-dip, 550 g/m² min | Hot-dip, 550 g/m² min |
| Containment | Lower to medium (cars, light vehicles) | High (buses, heavy trucks) | Matched to location |
| Best used at | Divided highway medians & edges | Bridges, sharp curves, hill roads, expressways | General highway furniture |
| Governing codes | MoRTH 800, IRC: 119, IS 2062, AASHTO M-180 | MoRTH 800, IRC: 119, EN 1317 (ref) | MoRTH 800, IRC: 119 |
Containment class and end-treatment (fish-tail, buried-in or energy-absorbing terminals) must match the hazard at each location. See the containment-levels guide below for the selection framework.
Perimeter Security
Fencing & Wire Specifications
| Product | Construction | Security level | Typical use |
|---|---|---|---|
| Concertina wire | Razor barbed tape in expanding coils, clipped at intervals; blades BTO-22 / BTO-30 / CBT-65; coil dia 450 – 980 mm | Highest | Defence, airports, prisons, power & oil facilities, borders |
| Razor wire | Core wire wrapped with barbed tape; straight or coiled | High | Wall tops, industrial perimeters |
| Barbed wire | Two twisted galvanised wires with barbs at intervals | Low | Agricultural & boundary demarcation |
| Chain-link fence | Single wire woven into a diamond mesh; GI / PVC coated | Boundary | Compounds, playgrounds, long perimeters |
| Welded wire mesh | Straight wires spot-welded at each intersection; rigid panel | Medium–high | Security fencing, factories, substations, railways |
Core wire is typically 2.5 mm and barbed tape 0.5 mm thick; galvanised steel suits most conditions, stainless steel 304/316 for coastal or highly corrosive sites.
Civil & Geotechnical
Geosynthetic Specifications
| Product | Primary function | Typical material / range | Governing codes |
|---|---|---|---|
| Geotextile | Separation, filtration, drainage | PP / PET woven or non-woven, 120 – 800 GSM | IS 14986, IS 16352, ASTM D 4439 |
| Geogrid | Soil reinforcement (tensile) | Polymer grid, tensile 20 – 200 kN/m | IRC SP: 59, MoRTH 700 |
| Geocell | Confinement / load support on soft soil | HDPE honeycomb, expanded & infilled on site | MoRTH 700, project spec |
| Geomembrane | Containment (impermeable) | HDPE or bituminous liner | Project / IS spec |
Many projects combine these — for example a geotextile filter beneath a geomembrane liner, or a geogrid over a geotextile separator on soft subgrade.
Compliance
Standards & Codes Reference
| Code | What it covers |
|---|---|
| MoRTH Section 800 | Material & workmanship for road signs, markings and appurtenances, including metal beam crash barriers |
| IRC: 119 | Guidelines on Traffic Safety Barriers — selection, containment level, deflection, placement and terminals |
| IS 2062 | Hot-rolled medium and high-tensile structural steel (barrier rails and posts) |
| IS 2629 | Recommended practice for hot-dip galvanising of iron and steel |
| IS 4759 | Hot-dip zinc coatings on structural steel and other allied products |
| IS 277 | Galvanised steel sheets (plain and corrugated) |
| AASHTO M-180 | Corrugated sheet steel beam guardrail (international reference) |
| EN 1317 | Road restraint systems — containment classes N1–H4 (reference framework) |
| IS 14986 | Woven geotextiles for road applications |
| IS 16352 | Non-woven geotextiles |
| ASTM D 4439 | Standard terminology for geosynthetics |
Standards are revised periodically. Confirm clause numbers and acceptance values against the specific revision named in your tender before ordering.
Common Questions
Technical Reference FAQ
What thickness and zinc coating does a W Beam crash barrier require?
W Beam crash barrier rails are typically 2.67 mm to 3.00 mm thick, hot-dip galvanised to a minimum zinc coating of 550 g/m² for highway use, on C, Z or Sigma section posts. Exact values are set by the project tender and the current IRC: 119 and MoRTH Section 800 requirements.
What is the difference between BTO-22, BTO-30 and CBT-65 concertina wire?
BTO (Barbed Tape Obstacle) numbers indicate approximate barb length in millimetres — BTO-22 has a 22 mm barb, BTO-30 a longer 30 mm barb. CBT-65 (Concertina Barbed Tape) carries long, closely spaced 65 mm blades for the highest deterrence. Larger, sharper blades mean stronger physical and visual deterrence.
Which standards govern crash barriers in India?
MoRTH Specifications Section 800 covers material and workmanship for road appurtenances including metal beam crash barriers, while IRC: 119 (Guidelines on Traffic Safety Barriers) governs selection, containment level and placement. Supporting IS codes such as IS 2062, IS 2629 and IS 4759 cover the steel and galvanising.
What is the difference between geotextile, geogrid, geocell and geomembrane?
Geotextile is a permeable fabric for separation, filtration and drainage; geogrid is a stiff grid for soil reinforcement; geocell is a 3D honeycomb that confines fill to spread load; and geomembrane is an impermeable barrier for containment. Each solves a distinct engineering problem.
Need a spec matched to your tender?
Send your BOQ or specification sheet — the Auroguard Engineering Desk will confirm production feasibility and quote factory-direct.
