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New Cement Specification and Cement Types Road Pavements Forum Thursday 17 May 2001

New Cement Specification and Cement Types Road Pavements Forum Thursday 17 May 2001. Historical product range in South Africa. OPC - SABS 471 RHC - SABS 471 PBFC - SABS 636 PC15 (SL or FA) - SABS 831 PFAC - SABS 1466 Masonry cements - no standard. Cement extenders.

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New Cement Specification and Cement Types Road Pavements Forum Thursday 17 May 2001

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  1. New Cement Specification and Cement TypesRoad Pavements Forum Thursday 17 May 2001

  2. Historical product range in South Africa • OPC - SABS 471 • RHC - SABS 471 • PBFC - SABS 636 • PC15 (SL or FA) - SABS 831 • PFAC - SABS 1466 • Masonry cements - no standard

  3. Cement extenders • SABS 1491 covers the quality of extenders for use at the mixer • Slags from Iscor at Pretoria, Newcastle and Vanderbijlpark were confirmed suitable through research • Fly ashes from Matla and Lethabo were also shown to meet requirements in extensive test programmes

  4. SABS adopts new cement standards in 1996 • SABS ENV 197-1 covering “Common Cements” • SABS ENV 413-1 covering “Masonry Cements”

  5. Nomenclature • CEM I, II, III, IV and V • I - Portland cement • II - Portland ……… cement • III - Blastfurnace cement • IV - Pozzolanic cement • V - Composite cement • A, B or C • indicates level of extender e.g. in CEM II A is 6-20% and B is 21-35%

  6. Nomenclature (cont.) • Extender type • S - Blastfurnace slag • D - Silica fume • V or W - Fly ash • L - Limestone • M - Composite

  7. Nomenclature (cont.) • Strength grade

  8. Nomenclature (cont.) • Example CEM II B-W 42,5 • Portland fly ash cement • Containing 21 to 35% fly ash • 2-day-strength > 10 MPa • 28-day-strength > 42,5 and < 62,5 MPa

  9. Average 28-day compressive strength of OPC/CEM I 42,5

  10. Factors to be considered when selecting cement type • Cost of concrete • 28-day compressive strength • Early compressive strength development • Ability to resist aggressive environment • Sensitivity to poor site practices and extent of supervision • Other properties (colour, heat development, control of ASR, etc.)

  11. Cautionary remarks • Do not extrapolate performance data for one cement as representing all cements • Do not assume that what is permitted in Europe will automatically work in SA • Ask for details of product performance from the manufacturer - check uniformity and performance relative to the issues of importance • Do not think that a SABS mark indicates that the cement is fit for any application

  12. Thank you all for your attendance

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