Cemex Cemstone
Portland-limestone cement BS EN 197-1 CEM II/A-L 52,5N
Cemex Cemstone is a factory produced Portland-limestone cement with a lower carbon footprint compared to other types of Portland cements.
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Cemex Cemstone® provides benefits in a wide range of concrete, mortar, render, screed and grout applications.
Incorporating finely ground limestone, Cemex Cemstone® contains lower levels of Portland cement clinker than CEM I alternatives meaning a lower level of carbon intensity but with equivalent levels of technical performance. A small quantity of gypsum is introduced during grinding to control the setting characteristics of the cement.
Cemex Cemstone® is suitable for use as an alternative to Portland cement in most types of concrete except where aggressive ground conditions demand the use of sulfate resisting cement, when Cemex Extra® should be specified.
Part of the more sustainable by design Vertua® range, the pioneering Cemex Cemstone is a factory produced cement that reduces CO2 emissions in the process of manufacture by circa 32% compared to conventional Portland equivalents.
The use of Cemex Cemstone, either as a standalone product or in ternary combinations, is compliant with the newly published version of BS 8500. It offers exceptional performance with a lower carbon impact, giving you more flexibility on projects to achieve sustainable excellence through climate action, circularity, and natural resource management.
Applications
- For Use In Self-Compacting Concrete - Ideal for self-compacting concrete due to the inclusion of finely ground limestone
- Ideal For Aggressive Ground Conditions - Can be used in DC-1 and DC-2 aggressive ground conditions
- Multiple Uses - Can be used in concrete, mortar, render, screed and grouts.
Mix Properties
Concrete Mix
To produce a durable concrete using Cemex Cemstone, the cement content of the mix must be maintained at an acceptable level. BS 8500; Concrete, Complementary British Standard to BS EN 206-1), gives guidance for using a CEMII/A-L cement in concrete, under various exposure conditions.
Once in place, concrete requires moisture to develop its full strength and premature drying out must be avoided. In normal conditions and at temperatures in excess of 10ºC, concrete should be cured under damp conditions for 1 to 3 days, (cover with curing membrane, plastic sheeting or wet hessian); at temperatures below 10ºC, this curing time should be doubled. Protection against freezing is required until the concrete reaches a compressive strength of 5 MPa.
All normal concrete admixtures (eg plasticisers, air-entrainers, retarders) may be used with Cemex Cemstone. Trials should, however, be carried out to establish required dosage rates. A range of admixtures complying with BS EN 934 are also available from CEMEX.
Mixes to resist chemical attack
- Please refer to the latest version of the Building Research Establishment (BRE) Special Digest 1 or BS8500 Concrete
- Cemex Cemstone can be used in the same ground conditions as CEMI (CEMEX Portland), up to Design Chemical Class 2 Sulfate Conditions.
- In some marine environments an alternative cement to Cemstone may be necessary depending on the exposure conditions.
Cemstone Benefits
Vertua - more sustainable by design
The Vertua ‘lower carbon’ logo and label is shown on selected cement products characterised by their unique composition. These cements contain the highest quality ingredients to reduce the carbon footprint of the finished product.
Cements bearing this sign are guaranteed to reduce CO2 emissions in the process of their manufacture by over 25%, than conventional Portland cement CEM I*. Our cements labelled as Vertua Ultra have over 40% lower CO2 emissions with comparable performance.
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