GGBS Testing
(Ground Granulated Blast Furnace Slag — IS 16714)

Complete physical and chemical testing of Ground Granulated Blast Furnace Slag (GGBS) for concrete and cement applications — verifying Blaine fineness, glass content, activity index, soundness and chemical composition.

Overview

What is the GGBS Testing?

Ground Granulated Blast Furnace Slag (GGBS) is a by-product of iron manufacture — quenched molten blast furnace slag ground to cement fineness. GGBS has latent hydraulic properties activated by Portland cement alkalis. Used at 30–70% cement replacement, GGBS reduces heat of hydration, improves long-term strength and dramatically reduces chloride permeability.

At Global Lab, GGBS testing is conducted as per IS 16714 and BS EN 15167 covering Blaine fineness (≥400 m²/kg), glass content (≥85%), activity index at 7 and 28 days, soundness (autoclave expansion), moisture and chemical analysis (CaO, SiO₂, Al₂O₃, MgO, S, Cl) — standard grade GGBS vs Ultrafine GGBS (UGGBS ≥600 m²/kg).

IS 16714 Complete Suite

All mandatory physical and chemical tests per IS 16714 for standard GGBS.

Activity Index at 7 & 28 Days

Hydraulic reactivity confirmed by mortar strength index testing.

Blaine Fineness ≥400 m²/kg

Standard GGBS fineness verified — distinguishes from UGGBS (≥600).

Glass Content ≥85%

Amorphous glass content per XRD or selective dissolution method.

NABL Certified Reports

All results on NABL-accredited letterhead per IS 16714 / BS EN 15167.

Chemical Analysis

CaO, SiO₂, Al₂O₃, MgO, S, Cl, TiO₂ by XRF analysis.

Test in Action

GGBS Testing — Site Images

GGBS Blaine Fineness Test

Activity Index Mortar Cube Casting

XRF Chemical Analysis of GGBS

Test Procedure

How the GGBS Testing is Conducted

1

Sample Collection

GGBS sample from bulk tanker, silo or bag per IS 16714 procedure.
2

Physical Tests

Blaine fineness, specific gravity, moisture content and soundness tested.
3

Activity Index

Mortar cubes with 50% GGBS + 50% OPC vs 100% OPC control at 7 and 28 days.
4

Glass Content

XRD or selective dissolution method to determine amorphous content.
5

Chemical Analysis & Report

XRF chemical analysis. IS 16714 compliance checked. NABL report within 35 days.

Standards & Specifications

Applicable Test Standards

Standard	Title	Scope	Type
IS 16714	Ground Granulated Blast Furnace Slag for use in Concrete, Mortar and Grout — Specification	GGBS Standard	Indian Standard
BS EN 15167	Ground Granulated Blast Furnace Slag for Use in Concrete, Mortar and Grout	GGBS Standard	British Standard
ASTM C989	Standard Specification for Slag Cement for Use in Concrete and Mortars	GGBS	ASTM
IS 1727	Methods of Test for Pozzolanic Materials	Pozzolan Testing	Indian Standard

Applications

Where is the CAPO Test Used?

Standard GGBS quality control for ready mix concrete plant use

Mass concrete heat of hydration reduction — dam, raft and mat foundations

Marine concrete chloride resistance improvement with GGBS replacement

GGBS batch acceptance testing for large infrastructure projects

Source approval of GGBS from new steel plant sources

White concrete with GGBS for architectural applications

Why Choose Global Lab

Our Advantages

NABL Accredited ReportsLegally valid IS 16714 compliance certificates for all project requirements.

Standard vs Ultrafine GGBSBoth standard GGBS (≥400) and UGGBS (≥600 m²/kg) testing available.

Mix Design IntegrationGGBS data directly used in our HPC and mass concrete mix design service.

Autovity Digital ReportsAccess all GGBS test data digitally from any device.

Pan-India CoverageTesting at all 7 NABL-accredited lab locations.

Combined SCM PackageGGBS + UGGBS + Fly ash + Silica fume testing as a complete SCM evaluation.

GGBS Testing(Ground Granulated Blast Furnace Slag — IS 16714)