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New Specification for Cement Extenders

This document outlines the updated specifications for cement extenders, incorporating commonly available materials such as Corexslag and chrome slag. The new guidelines emphasize modern statistical quality control requirements, ensuring alignment with international standards like SANS 1491. It includes activity index ratios for various mortar compositions, fineness categories, and loss-on-ignition limits for different materials. Additional provisions allow for comprehensive use of new supplementary materials, including combustion ash and ultra-fine super-pozzolans, enhancing performance and sustainability in cement applications.

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New Specification for Cement Extenders

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  1. New Specification for Cement Extenders M Mc Donald 10 November 2010

  2. Allow use of commonly available materials New Specification for Cement Extenders • Modern statistical quality control requirements • Align with international standards

  3. Allow use of commonly available materials New Specification for Cement Extenders • Corexslag • Chrome slag • New Materials • ???

  4. New Specification for Cement Extenders • Modern statistical quality control requirements

  5. SANS 1491

  6. SANS 1491

  7. SANS 1491-1 to SANS 55167-1 & -2 • Activity Index ratio (in percent) of the compressive strength of mortar prisms made from 50% test cement and 50% ground granulated blastfurnace slag, relative to the 7 & 28 Day compressive strength of mortar prisms made from 100% test cement

  8. SANS 1491

  9. SANS 1491-2 to SANS 50450 • Activity Index ratio (in %) of the compressive strength of mortar bars, prepared with 75 % test cement plus 25 % fly ash by mass, to mortar bars prepared with 100 % test cement. The activity index at 28 & 90 Days shall not be less than 75 % and 85 %, respectively.

  10. SANS 1491-2 to SANS 50450 • Fineness • Category N: The retained residue on a 45um screen shall not exceed 40 % by mass, • Category S: The retained residue on a 45um screen shall not exceed 12 % by mass.

  11. SANS 1491-2 to SANS 50450 • Loss on ignition • Category A: Not greater than 5,0 % by mass • Category B: Between 2,0 % and 7,0 % by mass • Category C: Between 4,0 % and 9,0 % by mass

  12. SANS 1491-2 to SANS 50450 • Coal Co-combustion • Vegetable material like wood chips, straw, olive shells and other vegetable fibres • Green wood and cultivated biomass • Animal meal • Municipal sewage sludge • Paper sludge • Petroleum coke • Virtually ash free liquid and gaseous fuels

  13. SANS 1491

  14. SANS 1491-3 to SANS 53263 • Activity Index the ratio (in %) of the compressive strength of mortar bars, prepared with 90 % test cement and 10 % silica fume, to the compressive strength of mortar bars prepared with 100 % test cement, shall be at least 100 % when tested at a mortar age of 28 days.

  15. SANS 1491-3 to SANS 53263 • EN 934 The mortar containing silica fume shall be mixed with an amount of super-plasticizer conforming to EN 934-2 - so that the mortar has a consistency equivalent to the reference mortar

  16. SANS 1491

  17. Granulated Blastfurnace Slag vitrified material made by rapid cooling of a slag melt of suitable composition, obtained by smelting iron ore in a blastfurnace, consisting of at least two thirds by mass of glassy slag and possessing hydraulic properties when suitably activated Part 4

  18. Part 4 • Chrome slag • Corexslag • New Materials • ???

  19. Include a new Part 4 for all supplementary materials not covered Other metallurgical slag Other combustion ash Other ultra-fine super-pozzolans Part 4

  20. SANS 1491 • Registration of project proposal for evaluation • Project Approved • Circulation of Committee draft for comment • Decision to return to drafting phase • Circulation for formal approval (DSS for 60 days or 30 days for ISO adoption) • Close of approval period (after 30 days or 60 days) • Standard published

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