AAC Block Testing
(Autoclaved Aerated Concrete — IS 2185)

Complete physical and mechanical testing of Autoclaved Aerated Concrete (AAC) blocks as per IS 2185 Part 3 — verifying dry density, compressive strength, moisture content, dimensional tolerances and water absorption.

Overview

What is the AAC Block Testing?

Autoclaved Aerated Concrete (AAC) Blocks are lightweight, thermally insulating masonry units produced from cement, fly ash, lime, gypsum and aluminium powder — cured under high-pressure steam (autoclave). They offer significant advantages over conventional brick — lightweight (400–800 kg/m³), excellent thermal insulation, fire resistance and workability.

At Global Lab, AAC block testing is conducted as per IS 2185 Part 3 covering dry density (Grade D4 to D8), compressive strength, moisture content at delivery, dimensional tolerances (length, width, height) and water absorption. Results determine the grade designation and suitability for load-bearing and non-load-bearing applications.

IS 2185 Part 3 Grade Testing

D4 to D8 density grade designation from measured dry density and strength.

Compressive Strength

Minimum 2 N/mm² (D4) to 5 N/mm² (D8) per IS 2185 Part 3 Table 1.

Dry Density Verification

Oven dry density — key parameter for structural design and dead load.

Moisture Content at Delivery

≤35% air dry moisture content per IS 2185 acceptance criteria.

NABL Certified Reports

All results on NABL-accredited letterhead with IS 2185 compliance.

Dimensional Tolerance Check

Length, width and height tolerances ±3mm per IS 2185 Part 3.

Test in Action

AAC Block Testing — Site Images

AAC Block Dimensional Check

Dry Density Oven Test

Compressive Strength Test in CTM

Test Procedure

How the AAC Block Testing is Conducted

1

Sample Selection

Minimum 6 blocks per consignment selected per IS 2185 Part 3 sampling procedure.
2

Dimensional Measurement

Length, width and height of all 6 blocks measured. Mean and range vs ±3mm tolerance.
3

Moisture Content

3 blocks tested for moisture content at delivery per IS 2185 Part 3.
4

Dry Density

3 blocks oven-dried to constant mass. Dry density = dry mass / volume calculated.
5

Compressive Strength & Report

3 blocks tested in CTM at specified loading rate. Compressive strength vs IS 2185 Table 1. NABL report within 7 days.

Standards & Specifications

Applicable Test Standards

Standard	Title	Scope	Type
IS 2185 Part 3	Concrete Masonry Units — Autoclaved Cellular (Aerated) Concrete Blocks	AAC Block	Indian Standard
IS 6441	Methods of Test for Autoclaved Cellular Concrete Products	AAC Testing	Indian Standard
BS EN 771-4	Specification for Masonry Units — Autoclaved Aerated Concrete Masonry Units	AAC Standard	British Standard
IS 1905	Code of Practice for Structural Use of Unreinforced Masonry	Masonry Design	Indian Standard

Applications

Where is the CAPO Test Used?

Incoming quality control of AAC blocks at construction sites

Acceptance testing of AAC blocks for RERA-compliant residential projects

AAC block manufacturer quality certification testing

Comparative testing of AAC blocks from multiple manufacturers

Load-bearing AAC block wall structural assessment

Green building AAC block thermal and acoustic property verification

Why Choose Global Lab

Our Advantages

NABL Accredited ReportsLegally valid IS 2185 compliance certificates for all project requirements.

Complete IS 2185 SuiteDensity, strength, moisture and dimensions in one comprehensive report.

Grade DesignationD4 to D8 grade assigned — directly usable in structural design.

Fast 7-Day TurnaroundComplete IS 2185 Part 3 test suite within 7 days.

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

Combined Block TestingAAC + Hollow concrete + Paver block testing offered together.

AAC Block Testing(Autoclaved Aerated Concrete — IS 2185)