Development of interior relative humidity due to self-desiccation in blended cementitious system

Yong Zhang, Guang Ye

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

10 Citations (Scopus)
30 Downloads (Pure)

Abstract

In engineering practise, interior relative humidity (RH) of concrete significantly affects the transport properties and thus the service life of concrete structures. In this paper, the development of RH due to self-desiccation in blended cement pastes was studied from 1 day to 1.5 years. The pore structure and non-evaporable water content at same ages were determined by mercury intrusion porosimetry and thermogravimetric analysis, respectively. The results revealed that interior RH was significantly reduced at the first 105 days’ curing and falls off slightly afterwards, regardless of water to binder ratios and type of blends. Compared to ordinary Portland cement (OPC) paste, the OPC paste blended with slag shows much lower interior RH, whereas the addition of fly ash slightly increases the interior RH. Minor amount of limestone addition i.e., 5% wt. greatly increases the RH in ternary system consisting of OPC, slag and limestone, whilst slightly decreases the RH in OPC paste blended with fly ash. In the presence of blends, high total porosity corresponds to low interior RH. In case of self-desiccation, it is concluded that interior RH is mainly controlled by average pore size in the cement-based materials.
Original languageEnglish
Title of host publicationProceedings of the International RILEM Conference Materials, Systems and Structures in Civil Engineering 2016
Subtitle of host publicationSegment on Moisture in Materials and Structures
EditorsKurt Kielsgaard Hansen, Carsten Rode, Lars-Olof Nilsson
Place of PublicationParis, France
PublisherRILEM publications S.A.R.L
Pages1-10
Number of pages10
ISBN (Electronic)978-2-35158-179-7
ISBN (Print)978-2-35158-178-0
Publication statusPublished - 2016
EventInternational RILEM Conference on Materials, Systems and Structures in Civil Engineering : Conference segment on Concrete with Supplementary Cementitious Materials - Technical University of Denmark, Lyngby, Denmark
Duration: 22 Aug 201624 Aug 2016
http://www.conferencemanager.dk/MSSCE2016/home.html

Conference

ConferenceInternational RILEM Conference on Materials, Systems and Structures in Civil Engineering
Abbreviated titleMSSCE 2016
CountryDenmark
CityLyngby
Period22/08/1624/08/16
Internet address

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