Portland cement LIMESTONE

pavingfor civil engineeringfor roofs

Overview Portland Limestone Cement is a lower-carbon alternative to traditional Portland Cement. It is widely used in ready-mixed concrete, concrete products, civil engineering and building applications. Portland Limestone Cement is available in bulk tanker delivery throughout Great Britain and carries independent third-party certification including the UKCA mark.

Applications

• Architectural concrete
• Concrete block paving
• Dry silo mortar
• Engineered concrete solutions
• Roof tiles and concrete roof products

Benefits Portland Limestone Cement reduces embodied CO2 through increased limestone content while maintaining performance similar to Bulk Portland (CEM I) concrete. It has a paler colour suitable for decorative and architectural concrete and is quality assured with independent third-party certification and carries a UKCA mark.

Technical information Fresh concrete made with Portland Limestone Cement shows properties similar to Bulk Portland CEM I concrete, although setting time may be slightly shortened and tendency to bleeding significantly reduced. At equal concrete strength, performance is comparable to CEM I regarding carbonation rate, chloride ingress and resistance to freezing and thawing (for both air-entrained and non-air-entrained concrete). Cement content required for a given 28-day cube strength and slump should be determined from trial mixes; for high-strength concrete cement content may be slightly higher than for CEM I.

User guide / Usage notes Concrete, mortars and grouts containing Portland Limestone Cement must be specified and used correctly for best performance. Cement content must be correct and water:cement ratio kept as low as possible consistent with satisfactory placing, thorough compaction and effective curing. Final finish quality depends on user skill and familiarisation with the material and application methods. Portland Limestone Cement is manufactured from natural products and slight shade variations may occur between manufacturing centres. Tarmac cannot be held responsible where workmanship has not been carried out in accordance with good practice.

Downloads (document names only)

• Portland Limestone Cement Data Sheet
• Common Cements Safety Data Sheet

Caractéristiques / spécifications techniques

• Product type: Portland Limestone Cement (commercial denomination: Portland Limestone Cement)
• Cement grades / references mentioned: CEM II / A-L or LL 52,5N (optimised strength for concrete producers and precast manufacturers; enhanced properties for ready-mixed concrete)
• Intended uses: ready-mixed concrete, precast concrete, concrete products, mortar, grout, render and screed
• Delivery: available in bulk tanker throughout Great Britain
• Fresh concrete behaviour: similar to Bulk Portland CEM I; slightly shortened setting time; significantly reduced tendency to bleeding
• Durability performance: similar to CEM I for carbonation rate, chloride ingress and resistance to freezing/thawing
• Specification advice: cement content for target 28 day cube strength and slump to be determined from trial mixes; water:cement ratio to be kept as low as possible consistent with placing, compaction and curing
• Appearance: paler colour; shade variations possible across manufacturing centres
• Quality assurance: independent third party certification; carries UKCA mark