A Portland fly ash blended cement, INSEE EXTRA is Sri Lanka’s first cement to be certified for “Sulphate resistance” under the Sri Lankan (SLS) standard. INSEE EXTRA is also Sri Lanka’s first and only cement to be certified for both “Low Heat” and “Sulphate resistance” under the British (BSEN) standard, making it ideal for mass pouring concrete requirements and thick concrete constructions.

INSEE EXTRA is a result of years of research and innovation, and is manufactured with consistent quality, high-grade clinker and silica rich ‘Class F’ fly ash to significantly increase sulphate resistance and Alkali Aggregate Reaction (AAR) Resistance of concrete structures. This property makes INSEE EXTRA suitable for durable concrete structures exposed to reactive or aggressive environments. Fly ash used in the manufacturing of INSEE EXTRA also effectively increases the pumpability of concrete.

Fact File

Type :Low Heat / Sulphate Resisting Blended Hydraulic Cement
Sri Lankan Standard :SLS 1247:2015
Strength Class :42.5N
British Standard :BS EN 197-1:2011 CEM IV/A 42.5N-LH/SR

PROPERTYSLS 1247 : 2015
(For Sulphate Resisting Cement)
Compressive Strength (2 days)≥ 10 N/mm2≥ 15 Mpa
Compressive Strength (28 days)42.5 – 62.5 N/mm250 Mpa
Setting Time≥ 60 minutes180 – 200 minutes
FinenessNot Specified in Standard410 – 430 m2/kg
Soundness< 10 mm< 1 mm
Relative DensityNot specified in standard~ 2.98
SO3≤ 3.0 %>3
Chloride≤ 0.10 %<0.08
LOINot specified in standard<3
An average of internal test results.


INSEE EXTRA is compatible with:

  • Chemical Admixtures complying with BS EN 934-1:2008
  • Fly Ash complying with BS EN 450
  • Ground Granulated Blast Furnace Slag (GGBS) complying with BS EN 15167-1:2006
  • Silica Fume complying with BS EN 13263-1:2005+A1:2009
  • Manufactured Sand (M-Sand) complying with BS EN 12620:2013
  • Natural Sand, Quarry Sand and Offshore Sand complying with BS EN 12620:2013

INSEE EXTRA is used for:

  • Concreting in aggressive environments
  • Thick concrete components such as piling, bridge piers, etc.
  • Mass concrete pouring / Temperature controlled concreting
  • Water structures / Spillways
  • Mass concrete structures where the heat of hydration effect is high
  • Concrete structures exposed to seawater (harbours, jetties, bridges, buildings etc.)
  • Concrete structures in sewerage projects (treatment plants, sewer lines, etc.)
  • Concrete in contact with water (water supply projects, irrigation structures, canal systems, dams, etc.)
  • Concrete in contact with sulphate rich soil
  • Concrete in contact with acids

Features and Benefits

Mass Pouring

Cement is the main component that is responsible for temperature development within concrete. For larger areas of concreting, high internal temperatures can cause adverse reactions such as cracking due to thermal contractions, reducing the service lifecycle of concrete structures. INSEE EXTRA is certified as a low heat cement product in adherence to British (BSEN) Standards, ensuring great reductions in internal temperature development of the structure.

Waterproof Concrete

When cement hydrates, it forms calcium-silicate hydrate gel (CSH) – which is the glue that holds the concrete together. It also forms calcium hydroxide
(Ca(OH)2), and higher the proportion of CSH to Ca(OH)2 in the concrete, lower the permeability of the structure. One more functionality of fly ash in INSEE EXTRA is that it reacts with the remaining Ca(OH)2 in the concrete to form additional CSH, decreasing bleed channels, capillary channels and void spaces in the concrete, greatly reducing permeability and increasing the durability of the structure.

High Pumpability

Fly ash particles are spherical shaped and act as micro ball bearings within the concrete mix, providing a lubricant effect to the mix. This property reduces the friction during the pumping process and increases the pumpability of the concrete onto higher elevations.

Sulphate & Chloride Resistance

INSEE EXTRA is the first Sri Lankan cement product that is certified as a sulphate resisting cement. This makes INSEE EXTRA the ideal product to be used in constructions in aggressive environments that contain sulphate rich soils, salts and acids that harm and / or accelerate the decaying process of concrete structures.

Alkali Aggregate Reaction (AAR) Resistance

The silica rich ‘Class F’ fly ash used in the manufacturing of INSEE EXTRA reduces AAR by chemically reacting with alkalis in the cement and absorbing them, thereby eliminating the possibility of alkalis reacting later with potential reactive aggregates in the concrete mix.

A wide range of tests and equipment to assess fresh and hardened concrete properties

  • Specified Tests for Self-Compacting Concrete
    • Flow Table Test – BS EN 12350-5:2019
    • J-Ring Test – BS EN 12350-12:2010
    • V Funnel – BS EN 12350-09:2010
    • L Box – EN 12350
  • Slump test – BS EN 12350-2 and ASTM C143
  • Density of fresh concrete – ASTM C138
  • Air content in fresh concrete – ASTM 231
  • Concrete bleeding – ASTM 232
  • Concrete setting time – ASTM C403
  • Compressive Strength up to 180 MPa – Testing Machines (3000 & 4000KN) – Double the existing strength standards in Sri Lanka
  • NDT for Compressive Strength up to 130 MPa – Impact Rebound Hammers – Double the existing equipment capacity in Sri Lanka
  • Flexural Strength – ASTM C78 / BS EN 12390-5-2019
  • Splitting Resistance – ASTM C-496 / EN 12390-6 / EN 1338
  • Concrete Specimen Grinding Machine – BS EN 12390-2 2019/ ASTM D4543

A wide range of tests and equipment to assess and ensure your aggregate grade meets the demand and requirement of your concrete.

  • INSEE Measurement Tools
    • INSEE Blue™ – Assess clay content as key quality indicator for manufactured and natural pit sand
    • INSEE Shape™ – Assess the grain shape particles as key quality indicator for manufactured sand
  • Coarse and fine aggregate particles size distribution – ASTM C136 / C136M – 19 & BS EN 933-1
  • Relative Density and Absorption of Coarse Aggregates – ASTM C127-12
  • Aggregate Impact Value (AIV) – BS EN 1097-2:2010
  • Flakiness Index & Elongation Index – BS EN 933-3:2012
  • Soundness Test of Aggregates – SN EN 206-1
  • Aggregate Crushing Value (ACV)- BS EN 1097-2:2010
  • Los Angeles Abrasion Test – ASTM C 131-06

A range of tests to assess properties of fresh concrete that go beyond the traditional ‘slump test’, improving the quality and consistency of concrete.

  • INSEE Measurement Tools
    • INSEE Flow™
    • INSEE Heat™
    • INSEE Color™
    • INSEE ConTemp™
  • ICAR Rheometer for paste, mortar & concrete toassess pumpability, flow resistance, thickness, slump retention, admixtures compatibility
  • Grout for Pre-Stressing Tendons – BS EN 445 2007
  • Electrical Conductivity for paste & mortar
  • Cementometer™ latest microwave technology for the determination of fresh concrete water to cement w/c ratio

Advanced testing with durability indicators to optimize structural performance and extend the service life of concrete structures exposed to severe environments.

  • Rapid Chloride Permeability Test - ASTM C1202
  • Bulk Electrical Conductivity of Hardened Concrete - ASTM C1760-12
  • Specific Resistivity - RILEM TC154 - AASHTO T358
  • Concrete Carbonation - Swiss SIA 262-1/1 CEN/TS 12390-12
  • O2 Permeability - RILEM 116-PCD CEMBUREAU Method
  • Capillary Water Absorption/ Sorptivity - Swiss SIA 262/1:2013 ASTM C1585-04
  • Initial Surface Absorption (ISAT) - BS 1881 Part 5
  • Water Permeability - EN 12390-8:2000
  • Concrete Sulphate Resistance - SIA 262-1/A