Pulverised Fuel Ash Lime Brick Testing
(FAL-G Brick — IS 12894:2002)

Complete physical testing of Pulverised Fuel Ash Lime (FAL-G) bricks as per IS 12894:2002 — verifying wet compressive strength class designation, water absorption, drying shrinkage, efflorescence and dimensional tolerances for green building and masonry construction acceptance.

Overview

What is the Pulverised Fuel Ash Lime Brick Testing?

Pulverised Fuel Ash Lime (PFA-Lime) Bricks — commonly known as FAL-G bricks or fly ash bricks — are manufactured from fly ash (conforming to IS 3812), Class C hydrated lime (IS 712), sand or bottom ash, and gypsum as an optional additive. The mixture is hydraulically pressed and steam-cured, forming chemically bonded bricks through calcium-silicate hydrate (C-S-H) gel — the same binding compound formed in Portland cement hydration.

At Global Lab, PFA-Lime brick testing is conducted as per IS 12894:2002 covering wet compressive strength (class designation 3.5 to 30 N/mm²), water absorption (≤20% up to Class 12.5; ≤15% for higher classes), drying shrinkage (≤0.15%), efflorescence rating and dimensional tolerances (±3mm length, ±2mm width/height). All tests conducted per IS 3495 Parts 1, 2 and 3 using NABL-calibrated equipment — providing complete IS 12894 class compliance certificates.

IS 12894:2002 Class Designation

Bricks classified as Class 3.5 to 30 N/mm² based on measured wet compressive strength.

Wet Compressive Strength

Minimum average wet compressive strength per IS 3495 Part 1 — tested wet after 24-hour immersion.

Water Absorption ≤20% / ≤15%

24-hour cold water immersion test per IS 3495 Part 2 — ≤20% up to Class 12.5; ≤15% for higher classes.

Drying Shrinkage ≤0.15%

Average drying shrinkage of 3 bricks per IS 4139 — maximum 0.15% per IS 12894.

NABL Certified Reports

All test and calibration results are backed by traceable measurements and standardized procedures.

Efflorescence & Dimensions

Efflorescence rating (≤moderate up to Class 12.5; ≤slight for higher) and dimensional tolerances per IS 12894.

Test in Action

Pulverised Fuel Ash Lime Brick Testing — Site Images

PFA Lime Bricks — FAL-G Bricks for Green Construction

Wet Compressive Strength Test after 24-Hour Immersion

Water Absorption and Drying Shrinkage Tests per IS 3495

Test Procedure

How the Pulverised Fuel Ash Lime Brick Testing is Conducted

1

Sample Collection

Minimum 20 bricks selected per IS 5454 sampling procedure from each consignment or production batch.
2

Dimensional Measurement

Length, width and height of all 20 bricks measured per IS 12894 Figure 2. Tolerances (±3mm length, ±2mm width/height) checked.
3

Wet Compressive Strength Test

5 bricks soaked in water for 24 hours, surface dried and tested in CTM per IS 3495 Part 1. Individual brick strength not to fall below class minimum by more than 20%.
4

Water Absorption, Drying Shrinkage & Efflorescence

Water absorption on 5 bricks per IS 3495 Part 2 (24-hr cold immersion). Drying shrinkage on 3 bricks per IS 4139. Efflorescence on 5 bricks per IS 3495 Part 3.
5

IS 12894 Class Report

Average wet compressive strength assigns class designation. All results vs IS 12894:2002 limits. NABL report within 14 days.

Standards & Specifications

Applicable Test Standards

Standard	Title	Scope	Type
IS 12894:2002	Pulverized Fuel Ash-Lime Bricks — Specification (First Revision)	PFA Lime Brick	Indian Standard
IS 3495	Methods of Tests of Burnt Clay Building Bricks — Parts 1, 2 and 3	Brick Testing	Indian Standard
IS 3812	Pulverized Fuel Ash — Specification (for fly ash used in brick manufacture)	Fly Ash Material	Indian Standard
IS 5454	Method for Sampling of Clay Building Bricks (applicable to PFA bricks)	Sampling	Indian Standard

Applications

Where is the Pulverised Fuel Ash Lime Brick Testing Used?

Green building and LEED/GRIHA/IGBC certified project brick acceptance testing

Government housing scheme (PMAY, EWS) fly ash brick quality control

Non-load-bearing partition wall and boundary wall fly ash brick acceptance

Thermal power station township construction using locally available fly ash

Fly ash brick manufacturer IS 12894 class certification and batch quality control

Comparative testing of fly ash bricks from multiple manufacturers for procurement

Why Choose Global Lab

Our Advantages

NABL Accredited ReportsLegally valid IS 12894:2002 class certificates for all project and statutory requirements.

Accurate Class DesignationWet compressive strength tested correctly in saturated condition — not dry — per IS 12894.

Complete IS 12894 SuiteCompressive strength + Water absorption + Drying shrinkage + Efflorescence + Dimensions in one report.

Fast 14-Day ReportComplete IS 12894 test suite including drying shrinkage within 14 days.

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

Combined Brick PackagePFA Lime + PFA Cement + Common Burnt Clay brick testing offered together for comparison.

Pulverised Fuel Ash Lime Brick Testing(FAL-G Brick — IS 12894:2002)