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Composite Cement Testing Dyckerhoff Germany . Denver, June 2012, Heiko Plack. Test Programme. Combinations tested ( varying contents ): Cementitious component : API Class G (medium coarse cement , Blaine 3.100 cm2/g) API Class G + CEM I 42,5 N (medium fine cement , Blaine 3.900 cm2/g)

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composite cement testing dyckerhoff germany

Composite CementTesting Dyckerhoff Germany

Denver, June 2012, Heiko Plack

test programme
Test Programme
  • Combinationstested (varyingcontents):

Cementitiouscomponent:

    • API Class G (medium coarsecement, Blaine 3.100 cm2/g)
    • API Class G + CEM I 42,5 N (medium finecement, Blaine 3.900 cm2/g)
    • API Class H (coarsecement , Blaine 2.550 cm2/g)

Additive:

    • Silicaflour
      • Medium fine (Blaine 3.200 cm2/g)
      • Coarse (Blaine 1.000 cm2/g)
    • Natural pozzolan (veryfine, Blaine 8.000 cm2/g)
        • Variationsinclude also changingwater-to-cement/blendratio = slurrydensity
        • Blendsweretestedaccordingtophysical API Spec 10A requirements
discussion of r esults
DiscussionOfResults
  • Assumption (Dyckerhoff proposal): Standardizationeffortstarget on specifying a „basic“ cement, and not a „specialcement“, e.g. lightweightcement (coveredby Lafarge NA proposal)
  • = slurrydensityforperformancetestingis > 1.800 g/cm3
  • Additives do affecttheslurrydensityby
    • theirown absolute densitydifferingfrom Portland cement
    • higherspecificsurfaceareaincreasingthewaterdemand
  • = difficulttospecifythewater-to-cement/blendratio, likeforcurrentbasiccements, G and H
  • However, mostimportantperformancerequirementsidentifiedas
    • Free fluid (slurrystability)
    • Max. consistency 15 – 30‘ („rheology“)
    • Thickening time Schedule 5 („pumping time“)
    • Compressivestrength [email protected]°F („later“ strength)
discussion of results conclusion i
DiscussionOfResults – Conclusion (I)
  • Blendsof different cementcomponents (reactivity / fineness) + silicaflourof different finenesshavebeentested (+ a veryfinenaturalpozzolan)
  • Apart fromthecontentofusedcomponentsthewater-to-cement/blendratiohasbeenvariedrespectivelyadjusted.
  • Itis evident that a cementmanufacturerhassufficientdegreeoffreedomtoadjustphysicalperformancepropertiesof a compositecementbyvarying
    • Cement type (reactivity)
    • Additive finenessandcontent
    • Water-to-cement/blendratio
discussion of results conclusion ii
DiscussionOfResults – Conclusion (II)
  • Thus
    • nomaximumormininimshareof additive istobespecified,
    • nowater-to-cementratioistobespecified,
    • instead, a slurrydensityrangeistobespecifiedforperformancetesting
conclusion suggestion i lafarge na proposal
Conclusion / Suggestion (I) - Lafarge NA proposal

Suggestion tospecifytwonew API Spec 10A Composite CementClasseswiththefollowingphysicalrequirements:

  • Composite cement#1 (API Class E?) → Lafarge NA results / proposal:
    • Additives: Pozzolanic (natural + artificial), listofmaterialstobedefined!
    • Slurrydensityforperformancetesting: 12,0 lb/gal< SG < 16,7 lb/gal
    • Free fluid: < 5,9%
    • API Schedule 5 thickening time: TT > 90‘
    • Max. consistency 15 – 30‘: < 30 Bc
    • [email protected]°F: > 500 psi

NochemicalrequirementstobespecifiedforbothnewClasses!

conclusion suggestions ii dyckerhoff proposal
Conclusion / Suggestions (II) – Dyckerhoff proposal
  • Composite cement#2 (API Class F?) → Dyckerhoff results / proposal
    • Consideredas a „basiccement“
    • Additives: Silicaflour + Pozzolans
    • Slurrydensityforperformancetesting: 15,0 lb/gal< SG < 16,7 lb/gal
    • Free fluid: < 5,9%
    • API Schedule 5 thickening time: 90‘ < TT < 120‘ (130‘?)
    • Compressivestrength [email protected]°F: > 1.000 psi

Nochemicalrequirementstobespecified !

However, classificationas HSR grade possibleif

  • Portland clinkerusedcomplieswith HSR requirementsofClasses G/H
conclusion suggestions iii
Conclusion / Suggestions(III)
  • Specifyingslurrydensityrequires a referenceto API RP 10B forthetestmethod. Mudbalancesusuallyavailableat all cementmanufacturer‘slabs, calculationfrom absolute densitiesofcomponentsmay also beconsidered.
  • Requirementtoprovidetestreportalongwithanyordershallstate:
    • Slurrydensityatwhichperformancetestswereconducted
    • Water-to-cement/blendratioatwhichperformancetestswereconducted
    • Share of Portland cementrespectivelyof additive
    • Type of additive (silicaflour, fly ash, naturalpozzolan)
    • + resultsofphysicaltestingasspecified (seeabove)
    • Chemical specification ???
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