NABL Accredited · Dimensional Calibration
CBR Mould Calibration
(IS 9669 — 150mm CBR Mould & Collar)
NABL-accredited dimensional calibration of CBR moulds (150mm × 175mm) per IS 9669 — verifying internal diameter, height and certified internal volume for IS 2720 Part 16 density calculations.
IS 9669
Standard
±0.5mm
Accuracy
1 Day
Report TAT
NABL
Accredited
NABL Accredited Lab · ISO/IEC 17025:2017
Digital Reports via Autovity QLMS
Pan-India · 7 Lab Locations
Est. 2009 · 20,000+ Projects
Overview
What is the CBR Mould Calibration?
The CBR Mould (150mm dia × 175mm per IS 9669) compacts soil for IS 2720 Part 16 CBR testing. Internal volume is used to calculate dry density — incorrect diameter leads to systematic density errors.
At Global Lab, CBR mould calibration per IS 9669 verifies: internal diameter at top, middle and base, internal height, base plate flatness, extension collar and volume V = π/4 × D² × H — certified on NABL certificate.
Non-Destructive
Minimal surface preparation. Structure integrity is preserved throughout testing.
Fast Turnaround
On-site results within hours. Digital reports dispatched within 24 hours.
NABL Certified
All test and calibration results are backed by traceable measurements and standardized procedures.
Pan-India Coverage
Site engineers deployed across 7 lab locations and all major project sites.
Digital Reporting
Access reports anytime via Autovity QLMS client dashboard — zero paperwork.
High Accuracy
Results correlated to cube compressive strength with ±2% precision range.
Test in Action
CBR Mould Calibration — Site Images
CBR Mould Diameter at Top, Middle and Base
Certified Internal Volume from Measured Dimensions
IS 9669 Certificate with Volume for Density Calculation
Test Procedure
How the CBR Mould Calibration is Conducted
-
1
Surface Preparation
A shallow groove (approx. 25mm deep) is cut into the concrete surface using a diamond-tipped cutting tool. The surface is cleaned of dust and debris. -
2
Insert Disc Placement
A specially designed steel insert disc is placed into the groove. A thin rod connects the disc to the pullout apparatus above the surface. -
3
Hydraulic Pullout Force Application
A hydraulic jack applies a steady, controlled pullout force to the insert disc via the reaction ring resting on the concrete surface. -
4
Failure Load Recording
The maximum force at which the concrete cone is extracted is recorded. A digital load indicator provides real-time readings with data logging. -
5
Strength Calculation & Reporting
The pullout force is correlated to cube compressive strength using established calibration curves. NABL-accredited reports are issued via Autovity QLMS.
Standards & Specifications
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 9669 | Specification for CBR Apparatus | CBR Mould | Indian Standard |
| IS 2720 Part 16 | Methods of Test for Soils — CBR | CBR Test | Indian Standard |
| IS 3651 | Vernier Calipers | Reference Instrument | Indian Standard |
| NABL-141 | NABL Policy on Metrological Traceability | Traceability | NABL |
Applications
Where is the CBR Mould Calibration Used?
Annual CBR mould calibration for NABL geotechnical laboratory
Highway subgrade CBR laboratory mould calibration
Proctor + CBR mould calibration together
Research institute CBR mould calibration
New mould acceptance before first use
CBR mould audit when results are disputed
Why Choose Global Lab
Our Advantages
NABL Accredited CertificatesIS 9669 CBR mould certificates with certified volume.
Volume CertifiedPrevents systematic density calculation errors.
CBR + Proctor TogetherBoth moulds in one visit.
Fast 1-Day CertificateCertificate within 1 working day.
Pan-India CoverageDimensional calibration at all 7 locations.
Geotechnical Lab PackageCBR + direct shear + Proctor together.