Mechanical properties of Concrete with SAP. Part I: Development of compressive strength

Marianne Tange Hasholt, Morten H. Seneka Jespersen, Ole Mejlhede Jensen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

The development of mechanical properties has been studied in a test program comprising 15 different concrete mixes with 3 different w/c ratios and different additions of superabsorbent polymers (SAP). The degree of hydration is followed for 15 corresponding paste mixes. This paper concerns compressive strength. It shows that results agree well with a model based on the following: 1. Concrete compressive strength is proportional to compressive strength of the paste phase 2. Paste strength depends on gel space ratio, as suggested by Powers 3. The influence of air voids created by SAP on compressive strength can be accounted for in the same way as when taking the air content into account in Bolomeys formula. The implication of the model is that at low w/c ratios (w/c <0.40) and moderate SAP additions, SAP increases the compressive strength at later ages (from 3 days after casting and onwards), because SAP increases the degree of hydration and therefore also the gel space ratio of the paste. However, at high w/c ratios (w/c > 0.45) and addition of large amounts of SAP, this effect cannot counterbalance the strength reducing effect of increased void volume. In these cases, SAP addition reduces the compressive strength.
Original languageEnglish
Title of host publicationUse of Superabsorbent Polymers and Other New Additives in Concrete
Number of pages315
Place of PublicationBagneux, France
PublisherRilem publications
Publication date2010
Pages117-126
ISBN (Print)978-2-35158-104-9
Publication statusPublished - 2010
EventInternational RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete - Lyngby, Denmark
Duration: 15 Aug 201018 Aug 2010

Conference

ConferenceInternational RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete
CountryDenmark
CityLyngby
Period15/08/201018/08/2010

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