Flexural Testing Machine Calibration
(Force & Span — ISO 7500-1 / IS 516)
NABL-accredited calibration of flexural testing machines (beam testing frames) — verifying load cell or proving ring force accuracy, support span distance, loading roller geometry and loading rate for IS 516 concrete flexural strength testing.
What is the Flexural Testing Machine Calibration?
The Flexural Testing Machine applies a central point or third-point bending load to concrete beams (IS 516), mortar prisms (IS 4031), bituminous mix specimens and timber beams (IS 1708). The force measurement system (load cell or proving ring), the span between supports, the loading roller dimensions and the loading rate all require calibration to ensure accurate Modulus of Rupture (MOR) results.
At Global Lab, flexural machine calibration covers: force measurement system calibration by NPL-traceable reference per ISO 7500-1, support span measurement verification against calibrated steel rule per IS 1317, loading roller diameter and seating verification per IS 516, and loading rate verification. The span measurement is critical — flexural strength = 3WL/2bd² — a 1% span error causes 1% MOR error.
Non-Destructive
Fast Turnaround
NABL Certified
Pan-India Coverage
Digital Reporting
High Accuracy
Flexural Testing Machine Calibration — Site Images
How the Flexural Testing Machine Calibration is Conducted
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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.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| ISO 7500-1 | Metallic Materials — Calibration of Static Uniaxial Testing Machines | Force Calibration | ISO |
| IS 516 | Methods of Tests for Strength of Concrete — Flexural Strength | Flexural Test | Indian Standard |
| IS 1317 | Methods of Test for Length Measuring Instruments | Dimensional Reference | Indian Standard |
| NABL-141 | NABL Policy on Metrological Traceability | Traceability | NABL |