What is the Field CBR Test Apparatus used for?

The Field CBR Test Apparatus is a precision testing instrument supplied by JS Civil Lab Solutions for material quality control testing. It is used in civil engineering, construction material testing and laboratory applications across India.

What standard does the Field CBR Test Apparatus comply with?

Please contact JS Civil Lab Solutions at +91-93596-24761 for the specific standard compliance of the Field CBR Test Apparatus.

Can I get a price quotation for the Field CBR Test Apparatus?

Yes. Contact JS Civil Lab Solutions at sales@jscivillabsolutions.com or call +91-93596-24761 for a price quotation on the Field CBR Test Apparatus. The team responds within 1 business day.

Field CBR Test Apparatus

Name: Field CBR Test Apparatus
Brand: JS CIVIL
SKU: PC01-1339
Availability: InStock

✓ ISO 9001:2015 Certified | NABL-Aligned Calibration | Est. 2013 · 10+ Years | View Certifications →

Code: PC01-1339 ✓ In Stock

A Field CBR Test Apparatus is used to determine the California Bearing Ratio (CBR) of subgrade soil and compacted pavement layers in-situ — directly on the road or construction site — without needing laboratory specimens. The field CBR test is performed per IS 2720 (Part 31):1969 and IRC:37 standards and is essential for pavement design validation, quality control of compacted subgrade and sub-base, and investigation of existing road pavements. The apparatus includes a loading frame, proving ring/load cell, hydraulic jack, dial gauge set, and surcharge weights. JS Civil Lab Solutions supplies complete field CBR test apparatus sets with calibration certificate and AMC. Call +91 93596 24761 for pricing.

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What Is a Field CBR Test Apparatus?

A Field CBR Test Apparatus is a portable site testing setup used to determine the California Bearing Ratio (CBR) of soil subgrade, compacted sub-base, and granular base layers directly on the road or construction site — without excavating samples to a laboratory. The field CBR value is used to design flexible road pavements per IRC:37 (Guidelines for the Design of Flexible Pavements) and to verify that compacted subgrade meets the design CBR for which the pavement thickness was calculated.

Field CBR vs Laboratory CBR — When to Use Which?

Test	Standard	When to Use
Laboratory CBR	IS 2720 Part 16	During design phase — remoulded specimens at various compaction levels
Field CBR (In-Situ)	IS 2720 Part 31	During construction QC — verify actual compacted subgrade meets design CBR

Field CBR Test — Applicable Standards

Standard	Application
IS 2720 (Part 31):1969	Methods of Test for Soils — In-Situ California Bearing Ratio (CBR)
IRC:37:2018	Guidelines for Design of Flexible Pavements — uses CBR for pavement thickness design
ASTM D4429	CBR of soils in place
BS 1377 Part 9	Methods of test for soils — in-situ tests (CBR)

Field CBR Test Apparatus — Complete Set Includes

Loading frame (adjustable self-reacting or reaction truck)
Hydraulic jack with hand pump (50 kN capacity)
Proving ring or digital load cell (for load measurement)
50 mm diameter steel penetration plunger
Dial gauge set (0.01 mm graduation, 25 mm travel) for penetration measurement
Surcharge weights (simulates pavement overburden)
Steel bearing plate and spacer rings

Applications of Field CBR Testing in India

NHAI and state highway project QC — subgrade CBR verification before pavement laying
Airport pavement construction — runway subgrade assessment
Investigation of failed road pavements — determine subgrade contribution to failure
Railway embankment QC — assess formation bearing capacity
Industrial floor slab design — evaluate sub-base CBR before concrete floors