Supplementary cementing materials in concrete. Part II: A fundamental estimation of the efficiency factor

Papadakis, VG; Antiohos, S; Tsimas, S

dc.contributor.author	Papadakis, VG	en
dc.contributor.author	Antiohos, S	en
dc.contributor.author	Tsimas, S	en
dc.date.accessioned	2014-03-01T01:18:23Z
dc.date.available	2014-03-01T01:18:23Z
dc.date.issued	2002	en
dc.identifier.issn	0008-8846	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14970
dc.subject	Amorphous material	en
dc.subject	Compressive strength	en
dc.subject	Fly ash	en
dc.subject	Modeling	en
dc.subject	Pozzolan	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Approximation theory	en
dc.subject.other	Concretes	en
dc.subject.other	Pozzolan	en
dc.subject.other	Silica	en
dc.subject.other	Supplementary cementing materials	en
dc.subject.other	Portland cement	en
dc.title	Supplementary cementing materials in concrete. Part II: A fundamental estimation of the efficiency factor	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0008-8846(02)00829-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0008-8846(02)00829-3	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	For comparing the relative performance of various supplementary cementing materials (SCMs: silica fume, fly ash, slag, natural pozzolans, etc.) as regards Portland cement, the practical concept of an efficiency factor may be applied. The efficiency factor (or k value) is defined as the part of the SCM in an SCM-concrete that can be considered as equivalent to Portland cement. In the present work, an alternative procedure for experimental determination of the k value is proposed, using the concept of the pozzolanic activity index. For the first time, also, the k value for equivalent strength was correlated with the active silica content of the SCM through analytical expressions. Artificial pozzolanic materials of various compositions and some natural pozzolans were studied. It was found and verified by experimental comparison that these expressions are valid only for artificial SCMs (fly ash, slag), whereas in the case of natural SCMs the k value is overestimated. Thus, knowing primarily the active silica content of the SCM, a first approximation of the k value can be obtained and, further, the strength of a concrete incorporating artificial SCM can be predicted. (C) 2002 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Cement and Concrete Research	en
dc.identifier.doi	10.1016/S0008-8846(02)00829-3	en
dc.identifier.isi	ISI:000177984400004	en
dc.identifier.volume	32	en
dc.identifier.issue	10	en
dc.identifier.spage	1533	en
dc.identifier.epage	1538	en