Buildcrete Datasheet - Lafarge in South Africa

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BUILDCRETE Designed for customers’ convenience User-friendly Buildcrete maintains Lafarge Cement’s tradition of technical excellence and product innovation: • Superior workability for easy-to-handle, productive concrete and mortar work • Strength that meets the needs of domestic and most contract site projects • Quality and reliability of the renowned Buildcrete brand • Early strength gain to complete jobs quicker • The ‘Greenest’ formulation in our unique environmentallyfriendly range of products Concern for the environment Lafarge has for many years been one of the leaders in the building materials industry for actively pursuing sustainable development policies. The Group’s responsible environmental practices have reduced its global carbon dioxide (a ‘greenhouse’ gas) emissions by 18% since 1990. Contributing to this achievement, Lafarge Cement is the only South African cement manufacturer to have a complete range of ‘green’ products. • Lichtenburg Cement Works produces Buildcrete CEM IV/B-V 32,5R, a Pozzolanic cement, formulated from Portland clinker and quality siliceous fly ash, together with a strength enhancer • Richards Bay plant produces Buildcrete as a CEM IV/A-V 32,5R Portland-fly ash cement. The formulation is based on quality siliceous fly ash interground with Portland cement clinker together with a strength-enhancing additive. Recommended mix designs A standard builder’s wheelbarrow that holds 65 litres of material is generally used to measure out the correct volumes of cement, stone and sand required to make a batch of concrete. Buildcrete is supplied in 50kg bags for use in a wide range of smaller jobs, as indicated in the mix proportions tables below. 2 x 50kg bags (often still referred to as ‘pockets’) are equivalent in volume to one wheelbarrow load. Note: If you want to make a smaller batch of concrete, remember to use the same size container (for example a bucket) to measure all the ingredients. (Using a shovel to measure materials is not recommended because you cannot judge the quantities accurately.) Recommended mix proportions by volume using Buildcrete 32,5R Our ‘green’ cements Lafarge Cement’s products have innovative environmentallyfriendly formulations that: • use less non-renewable materials • create less greenhouse gas in their manufacture - Buildcrete reduces CO2 emissions by 40% compared to traditional ordinary Portland cement • reduce landfill sites Green Building Council Low Strength Home Concrete Foundations, Domestic Floors – unreinforced Medium Strength Driveways, light industrial floors - unreinforced High Strength Structural Applications Reinforced concrete suspended slabs, heavy duty industrial floors Watertight concrete reservoirs, ponds Mortar for Bricklaying and Plastering Brick and Block making (10-15 MPa) Cement Sand Stone 1 3,5 3,5 (20-25 MPa) 1 2,5 2,5 (25-30 MPa) 1 2 2 (30 MPa) 1 1,5 1,5 (5,0 MPa) 1 6 - 1 8 - Lafarge Cement is a member of the Green Building Council of South Africa (GBCSA). It is a commitment to assist the Council in leading the transformation of the South African property industry to ensure that all buildings are designed, built and operated in an environmentally sustainable way. The aim is to allow all people in our country to work and live in healthy, efficient and productive environments. Composition Buildcrete 32,5R is classified as a general purpose cement with early strength gain characteristics. It is produced at the Lafarge Lichtenburg Cement Works in North West Province and the Lafarge Richards Bay Grinding Plant in KwaZulu-Natal. The products conform to the SANS 50197 (EN 197) specifications in accordance with SANS 50196 (EN 196) test requirements. While the products from both factories have similar essential characteristics, the formulations take advantage of the available raw materials: Benefits of our innovative formulation The innovative extended formulations for Buildcrete have created an environmentally-friendly, all-round performance, quality cement with: • superior workability • higher long-term strength in concrete • good early strength gain Freshly mixed concrete made with Buildcrete has the benefits of: • Better workability for much easier handling, placing and finishing • The ‘R’ early strength gain that saves time and money by: - improving the output of masonry unit manufacture through earlier removal of the moulds and handling of concrete products such as bricks and blocks sooner - earlier stripping of formwork and props means hiring less shuttering and getting on with the job faster • More cohesive mixes that keep coarse aggregates uniformly PAGE 2 | INFO SHEET | 2009
BUILDCRETE mixed, resulting in an even strength throughout the pour and better finishes • Improved water retention and less bleeding for reduced cracking and better surface finish • Better productivity in winter: the ‘R’ feature helps to compensate for the slowing in strength gain in cold weather and maintain productivity For concrete in the hardened state, Buildcrete contributes: • Better finishes for floor slabs and off-shutter work with minimal surface cracks and imperfections • Denser concrete with good impermeability, which reduces leakage from water features and ponds Strength rating Standard strength: Buildcrete complies with the requirement in the SANS specifications for a minimum compressive strength ≥ 32,5MPa (EN prism test using a water/cement ratio of 0,5) within 28 days of casting. Early strength – the importance of ‘R’: The ‘R’ classification indicates that Buildcrete will achieve an early strength at 2 days ≥ 10,0MPa in accordance with the SANS specifications. (An ‘N’ designation refers to a class with ordinary early strength development.) Reliable quality The strength development and performance of Buildcrete is continually monitored for compliance with Lafarge’s demanding inhouse standards (referred to as “Usage Quality Testing”). While the Lafarge name is a worldwide assurance of quality, the Buildcrete bag also displays the following locally regulated quality symbols: • LOA number The Letter of Authority (LOA) number shows that Lafarge is authorised to sell Buildcrete in the South African market. It is mandatory to display a LOA number on a bag of cement and on the sale transaction documentation. • SABS mark Indicates that Buildcrete complies with the compulsory standard in the SANS 50197-1 (EN 197) specifications. Although displaying the SABS mark is no longer mandatory, Lafarge Cement voluntarily displays it • e-mark Indicates that the packaging equipment and systems at our Lichtenburg Cement Works have been audited and approved by the NRCS and comply with the SANS 1841 standard. Our customers are assured of receiving the quantity they have paid for Properties Buildcrete complies with the chemical and physical requirements of SANS 50197 (EN197) for a class 32,5R cement. Physical properties Property Buildcrete* EN Spec. requirement 2 day Compressive strength 16,0 MPa ≥ 10,0 MPa 7 day Compressive strength 26,8 MPa ----- 28 day Compressive strength 43,5 MPa ≥ 32,5 MPa Initial set 210 minutes ≥ 75 minutes Soundness 1,0 mm ≤ 10 mm Chemical properties Property Buildcrete* EN Spec. requirement SO 3 1,60% ≤ 3,5% m/m Cl- 0,030% ≤ 0,10% m/m Technical services Buildcrete is fully supported by the unique technical and laboratory resources of Quality Department Southern Africa (QDSA) at Industria, Gauteng. QDSA operates one of the largest and most respected SANAS (South African National Accreditation System) Accredited Civil Engineering testing facilities in South Africa. Complying with ISO/IEC 17025, the facility has a proud fourteen-year track record of continuous accreditation. Scope of QDSA’s Accreditation The SANAS accreditation covers thirty-four test methods, including all the SANS EN tests for Common and Masonry cements, other relevant SANS, EN and DIN test methods for aggregates and concrete, as well as an in-house method for Dense Medium Separation. Within the framework of this accreditation, QDSA can add another 200 tests to the above methods. Changes in the regulation of cement in South Africa: Cement now falls under the Compulsory Specification Act of South Africa. It is regulated by an independent government body called the NRCS, National Regulator for Compulsory Specifications, which is part of the Department of Trade and Industry. NRCS is a public entity responsible to the Minister of Trade and Industries for administration of technical regulations including Compulsory Specifications based on Standards that protect human health and safety, and the environment. The only major change is that it is no longer mandatory to show the SABS mark on cement bags. Instead, a Letter of Authority number (LOA number) must be displayed: it is strictly illegal to sell cement without the LOA number reflected on the delivery note and the bag. PAGE 3 | INFO SHEET | 2009
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Buildcrete Datasheet - Lafarge in South Africa

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