Mechanism for performance of energetically modified cement versus corresponding blended cement

The microstructure of cement paste of 50/50 mixes of cement/quartz and cement/fly ash, both ground in a special mill [energetically modified cement (EMC) process] and simply blended, have been studied under sealed curing conditions. The grinding process reduced the size of both cement grains and qua...

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Bibliographic Details
Published inCement and concrete research Vol. 35; no. 2; pp. 315 - 323
Main Authors Justnes, Harald, Elfgren, Lennart, Ronin, Vladimir
Format Journal Article
LanguageEnglish
Published New York, NY Elsevier Ltd 01.02.2005
Elsevier Science
Subjects
Applied sciences
Blended cements
Buildings. Public works
Cement concrete constituents
Cements
Concretes. Mortars. Grouts
Exact sciences and technology
Fly ash
General (composition, classification, performance, standards, patents, etc.)
Grinding
Konstruktionsteknik
Materials
Microstructure
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
Quartz
Structural Engineering
Blended cements
Fly ash
Microstructure
Quartz
Grinding
Performance evaluation
Scanning electron microscopy
Mortar
Thermogravimetry
Compressive strength
Experimental study
Mixture
Characterization
Particle size distribution
Cement paste
Cement
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Summary:The microstructure of cement paste of 50/50 mixes of cement/quartz and cement/fly ash, both ground in a special mill [energetically modified cement (EMC) process] and simply blended, have been studied under sealed curing conditions. The grinding process reduced the size of both cement grains and quartz/fly ash markedly and created flaky agglomerates of high inner surface for the finer particles. EMCs had much higher degree of hydration at 1 day, but similar as blends at 28 days. The pores were much finer for EMC paste due to smaller particles as also reflected in the strength. The morphology of calcium hydroxide in EMC paste appeared more mass like. Pozzolanic reaction was insignificant for quartz in EMC, but increased for fly ash. Thus, improved performance of EMC versus OPC can be explained by increased early hydration and extensive pore size refinement of the hardened binder resulting in reduced permeability and diffusivity for concrete.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0008-8846
1873-3948
1873-3948
DOI:10.1016/j.cemconres.2004.05.022