INSEE Extra Plus

The first slag blended cement to be introduced for the industrial segment construction in Sri Lanka, INSEE EXTRA PLUS is engineered from ground granulated blast furnace slag, reinforcing the sustainable longevity of constructions while also reducing the carbon footprint of concrete structures.

Promising high durability and performance, INSEE EXTRA PLUS was introduced to the local market to drive sustainable development and best practices across the country. INSEE EXTRA PLUS adds more value to constructions with elevated fresh and hardened properties of concrete such as superior strength, increased workability and high resistance to aggressive environments such as chloride, making it ideal for marine structures.

Fact File

Type :Blended Hydraulic Cement
Sri Lankan Standard :SLS 1247:2015 (Not confirmed yet)
Strength Class :42.5N

PROPERTYSLS 1247:2015 Requirement
(For Sulphate Resisting Cement)
Compressive Strength (2 days)≥ 10 N/mm2≥ 15 N/mm2
Compressive Strength (28 days)42.5 – 62.5 N/mm250 N/mm2
Setting Time≥ 60 minutes170 – 210 minutes
FinenessNot Specified in Standard410 – 430 m2/kg
Soundness< 10 mm< 1 mm
Relative DensityNot specified in standard2.98
SO3≤ 3.0 %< 2.8 %
Chloride≤ 0.1 %<0.08%
LOINot specified in standard<3.0%
C3A in Clinker ≤ 9.0%< 8.0 %
PozzolanicitySatisfies the test at 8 daysSatisfies the test at 8 days
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:

  • Large-scale infrastructure development projects that require longevity of structures (roads, bridges, waterways)
  • High performance concrete
  • Ecological, intelligent and economical construction applications
  • Precast and pre-stressed concrete elements
  • 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 chemicals

Features and Benefits

Highly Durable Concrete

INSEE EXTRA PLUS contains ground granulated blast furnace slag (GGBFS), a nonmetallic, recovered industrial co-product of iron blast furnaces used in steel production. Slag as a latent hydraulic has inherent chemical properties that produce denser concrete with low permeability. By decreasing bleed channels, capillary channels and void spaces in the concrete, INSEE EXTRA PLUS reduces the potential for corrosion of reinforcing steel, adding further longevity and durability to building structures.

Superior Late Strength

Slag as a latent hydraulic has inherent chemical properties that produce additional calcium-silicate hydrate gel (CSH) – the glue that holds the concrete together – by continuously reacting with the water and other chemical elements in the mix over time. This in turn results in denser, hardened concrete with enhanced late strength.

High Performance Concrete

INSEE Cement ensures the consistency and benchmarked quality of slag used in the manufacture of INSEE EXTRA PLUS with remarkable cementitious properties. high performing concrete structures. INSEE EXTRA PLUS results in concrete structures with enhanced properties that include higher compressive and flexural strength, lower heat generation and greater resistance to aggressive environments.

Superior Workability

Due to an optimum particle size distribution and packing density, INSEE EXTRA PLUS exhibits highly improved levels of workability and decreased in water demand from the lower relative density of slag.

High Chloride Resistance

Durability and service life of concrete structures can come under threat by chloride. INSEE EXTRA PLUS controls the penetration of chloride in concrete by the improved chloride on binding capacity in slag, minimizing chloride induced reinforcement corrosion in concrete structures, thereby enhancing durability. This improved resistance to chloride in INSEE EXTRA PLUS makes it the ideal cement for marine construction, aggressive environment and water supply projects.

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