1 / 10

Composite Cement Testing Dyckerhoff Germany

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)

hue
Télécharger la présentation

Composite Cement Testing Dyckerhoff Germany

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Composite CementTesting Dyckerhoff Germany Denver, June 2012, Heiko Plack

  2. 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

  3. Components Involved (Characterization)

  4. 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 8h@140°F („later“ strength)

  5. 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

  6. DiscussionOfResults – Conclusion (II) • Thus • nomaximumormininimshareof additive istobespecified, • nowater-to-cementratioistobespecified, • instead, a slurrydensityrangeistobespecifiedforperformancetesting

  7. 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 • Compressivestrength24h@100°F: > 500 psi NochemicalrequirementstobespecifiedforbothnewClasses!

  8. 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 8h@140°F: > 1.000 psi Nochemicalrequirementstobespecified ! However, classificationas HSR grade possibleif • Portland clinkerusedcomplieswith HSR requirementsofClasses G/H

  9. 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 ???

  10. Test Results

More Related