Certified Sulphate Resisting & Low Heat Cement
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.
|Low Heat / Sulphate Resisting Blended Hydraulic Cement
|Sri Lankan Standard :
|Strength Class :
|British Standard :
|BS EN 197-1:2011 CEM IV/A 42.5N-LH/SR
|SLS 1247 : 2015
(For Sulphate Resisting Cement)
|INSEE EXTRA PROPERTY
|Compressive Strength (2 days)
|≥ 10 N/mm2
|≥ 15 Mpa
|Compressive Strength (28 days)
|42.5 – 62.5 N/mm2
|≥ 60 minutes
|180 – 200 minutes
|Not Specified in Standard
|410 – 430 m2/kg
|< 10 mm
|< 1 mm
|Not specified in standard
|≤ 3.0 %
|≤ 0.10 %
|Not specified in standard
INSEE EXTRA is compatible with:
INSEE EXTRA is used for:
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.
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.
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.