INSEE Mahaweli Marine Plus

INSEE MAHAWELI MARINE PLUS is a high strength Portland Composite Cement of both Ground Granulated Blast Furnace Slag (GGBFS) and fly ash variants available for the first time in the local retail market.

Now with SLS 1697 certification Mahaweli Marine Plus is available in the market as composite cement to be sued in the harshest of environments for small and medium residential construction projects and other stakeholders as Concrete Products Manufactured (CPM) in the retail market. The versatility, strength and durability of the concrete mix has made INSEE MAHAWELI MARINE PLUS highly attractive to the local market that is responsibly contributing to sustainable construction practices.

Fact File

Name :INSEE Mahaweli Marine Plus
Type :Portland-Composite Cement
Sri Lankan Standard :SLS 1697:2021
Strength Class :42.5N
British Standard:BS EN 197 CEM II-B/M

PROPERTYSLS 1697:2021 Requirement
Compressive Strength (2 days)≥ 10 N/mm2≥20 N/mm2
Compressive Strength (28 days)42.5 – 62.5 N/mm2≥ 52 N/mm2
Setting Time≥ 60 minutes130 – 150 minutes
FinenessNot Specified in Standard400 – 420 m2/kg
Soundness< 10 mm< 1 mm
Relative DensityNot specified in standard2.96
SO3≤ 3.0 %< 2.8%
Chloride≤ 0.1 %< 0.05%
LOINot specified in standard< 3.0%
An average of internal test results.

INSEE MAHAWELI MARINE PLUS is compatible with:

  • Chemical Admixtures complying with BS EN 934-1:2008 and ASTM C494
  • Fly Ash complying with BS EN 450
  • Ground Granulated Blast Furnace Slag (GGBFS) 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


  • Residential concrete applications such as footings, basement walls, basement floor slabs, sidewalks, driveways, and garages
  • Precast and Concrete Products Manufactured (CPM)
  • Concrete roads
  • Masonry and decorative constructions due to superior workability with a smoother and aesthetic finish

Features and Benefits

High Strength Concrete

Both slag and fly ash variants of INSEE MAHAWELI MARINE PLUS display inherent chemical properties that improves resistance over time, thanks to the pozzolanic reaction between the free lime of the hydration of the clinker and the active siliceous in the fly ash and slag with the formation of more calcium silicate hydrate. This result in a denser concrete with enhanced strength for concrete structures and highly appreciated by concrete blocks producers and prefabricated concrete elements.

Highly Durable Concrete

Slag and fly ash have inherent chemical properties that produce denser concrete with low permeability. By decreasing bleed channels, capillary channels and void spaces in the concrete, INSEE MAHAWELI MARINE PLUS lowers permeability of the concrete, reducing the potential for corrosion of reinforcing steel, adding further durability to building structures.

Better Finish / Less Efflorescence

The enhanced workability of INSEE MAHAWELI MARINE PLUS ensures improved, smoother and aesthetically pleasing surface finishing of concrete structures and applications. This in addition to the inherent sulphate resisting property in both fly ash and slag variants, results in less efflorescence – crystalline salt deposits – forming on the uniform concrete surfaces.

Cost Efficient

The high strength developed in concrete produced with INSEE MAHAWELI MARINE PLUS allows for a large reduction of admixture and cement consumption in the mix, reducing raw material costs to a great extent. It also leads to optimized structural design that allow for thinner, lighter and fewer structural elements. The optimized mix designs also result in curling and heat, less shrinkage and lowering life cycle costs, through increased service life.

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