Ultrafine Fly Ash
(IS 3812 — Premium Pozzolan)

Complete physical and chemical testing of ultrafine fly ash — a premium SCM with Blaine fineness >800 m²/kg — offering superior pozzolanic reactivity for high-performance and marine concrete applications.

Overview

What is the Ultrafine Fly Ash (UFFA) Testing?

Ultrafine Fly Ash (UFFA) is produced by air classification of standard fly ash to remove coarser particles, resulting in Blaine fineness typically 800–1200 m²/kg — 3–4× finer than standard fly ash. Its ultra-fine particle size dramatically increases pozzolanic reactivity, improves pore filling and reduces chloride permeability.

At Global Lab, UFFA testing is conducted as per IS 3812 and ASTM C618 covering Blaine fineness (≥800 m²/kg), 45μm sieve residue (≤5%), lime reactivity, strength activity index at 28 days, soundness, LOI and chemical composition — verifying premium pozzolan requirements for HPC applications.

Ultra-High Blaine Verification

≥800 m²/kg Blaine confirmed — key differentiator from standard fly ash.

Lime Reactivity

Direct pozzolanic reactivity per IS 1727 — higher than standard fly ash.

45μm Sieve Residue

≤5% residue confirmed — ensures consistent ultra-fine particle size.

Strength Activity Index

28-day mortar activity index vs OPC control per IS 3812.

NABL Certified Reports

All results on NABL-accredited letterhead per IS 3812 / ASTM C618.

Chemical Analysis

SiO₂, Al₂O₃, Fe₂O₃, CaO, SO₃, LOI by XRF.

Test in Action

Ultrafine Fly Ash (UFFA) Testing — Site Images

UFFA Blaine Fineness Test Setup

45μm Sieve Residue Measurement

Strength Activity Index Mortar Cubes

Test Procedure

How the Ultrafine Fly Ash (UFFA) Testing is Conducted

1

Sample Collection

UFFA sample collected from bulk bag or silo per IS 3812 procedure.
2

Physical Tests

Blaine fineness, 45μm sieve residue, specific gravity, moisture content.
3

Reactivity Tests

Lime reactivity per IS 1727. Strength activity index mortar cubes at 28 days.
4

Soundness & LOI

Autoclave expansion soundness test. Loss on ignition at 950°C.
5

Chemical Analysis & Report

XRF chemical analysis. IS 3812 Part 1 compliance. NABL report within 35 days.

Standards & Specifications

Applicable Test Standards

Standard	Title	Scope	Type
IS 3812 Part 1	Pulverized Fuel Ash — Specification for Use as Pozzolana in Cement Mortar and Concrete	Fly Ash Standard	Indian Standard
ASTM C618	Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan	Pozzolan Standard	ASTM
IS 1727	Methods of Test for Pozzolanic Materials	Pozzolan Testing	Indian Standard
BS EN 450	Fly Ash for Concrete — Definition, Specifications and Conformity Criteria	European Standard	British Standard

Applications

Where is the CAPO Test Used?

HPC mix design with UFFA for superior impermeability in marine structures

Bridge deck and marine pile concrete with UFFA for 100-year design life

Ready mix concrete plant premium concrete production using UFFA

White HPC architectural concrete — UFFA provides lighter colour than standard fly ash

UHPC mix design incorporating UFFA for ultra-high performance requirements

Research on particle size effect of fly ash on concrete durability

Why Choose Global Lab

Our Advantages

NABL Accredited ReportsLegally valid IS 3812 compliance certificates for UFFA procurement.

Ultra-Fine Blaine Confirmation≥800 m²/kg Blaine — key premium characteristic confirmed.

Source ComparisonComparative testing of UFFA from multiple thermal power station classifiers.

HPC Mix IntegrationUFFA test data directly used in our HPC and marine concrete mix design.

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

Combined SCM PackageUFFA + Silica fume + Metakaolin + UGGBS as a complete SCM evaluation.

Ultrafine Fly Ash(IS 3812 — Premium Pozzolan)