Stability of Air Content in Fresh Concretes with PCE-Based Superplasticizers

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Al-Neshawy, Fahim Ojala, Teemu Punkki, Jouni 2019-08-15T08:27:22Z 2019-08-15T08:27:22Z 2019-07
dc.identifier.citation Al-Neshawy , F , Ojala , T & Punkki , J 2019 , ' Stability of Air Content in Fresh Concretes with PCE-Based Superplasticizers ' Nordic Concrete Research , vol. 60 , no. 1 , pp. 145-158 . en
dc.identifier.issn 0800-6377
dc.identifier.issn 2545-2819
dc.identifier.other PURE UUID: ced3db4e-5b7c-4ac2-a269-9364f806628d
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE FILEURL:
dc.description.abstract Air contents of concrete are necessary for concrete durability in freeze-thaw exposure. According to the Finnish concrete code, the target value for air content varies between 4% and 5.5% for XF -exposure classes. Lately in Finland, some cases showed an elevation of air contents up to 15% in fresh air-entrained concrete at construction site and in drilled concrete samples. The objectives of this study were to investigate the stability of air entrainment by measuring the air content elevation 30 minutes and 60 minutes after concrete mixing and investigating the concrete sensitivity to segregation. Composition of concretes used in this study include 7 different combination of PCE based superplasticizer and air-entraining agent admixtures, cement content of 425 kg/m(3), two consistency classes S3 with water to cement ration of 0.33 and F5 with water to cement ration of 0.38. One cement type was used for all concrete mixes. The concretes were mixed for 2 minutes and 5 minutes mixing times. The results show thatthe elevation of the air content of fresh concrete depends on the consistency of the concrete and on the used combination of superplasticizer and air-entraining agents. The higher consistency classes concretes have more risk of air elevation with some combinations of PCE-based superplasticizers and air-entraining agents. The results also indicate that short mixing time would not be enough to achieve total effectivity of some air-entraining agents, especially for higher consistency classes concrete. en
dc.format.extent 14
dc.format.extent 145-158
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Nordic Concrete Research en
dc.relation.ispartofseries Volume 60, issue 1 en
dc.rights openAccess en
dc.subject.other 212 Civil and construction engineering en
dc.title Stability of Air Content in Fresh Concretes with PCE-Based Superplasticizers en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Mineral Based Materials and Mechanics
dc.contributor.department Department of Civil Engineering en
dc.subject.keyword Air content
dc.subject.keyword superplasticizer
dc.subject.keyword air-entraining
dc.subject.keyword admixtures
dc.subject.keyword concrete
dc.subject.keyword 212 Civil and construction engineering
dc.identifier.urn URN:NBN:fi:aalto-201908154796
dc.identifier.doi 10.2478/ncr-2019-0093
dc.type.version publishedVersion

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