Quantification the filling of microcracks due to Autogenous self-healing in cement paste

Jiayi Chen, Xian Liu, Guang Ye

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

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Abstract

Microcracks play vital roles in the prediction of the service life of concrete structure. Because microcracks in concrete structure are the preferential ingression channels for aggressive ions, e.g., chloride, sulphate, etc. However, microcracks have potentials to self-heal autogenously due to the continuous hydration of unhydrated cement, especially when ultra-/ high strength concrete is used. To quantify the autogenous self-healing effects of microcracks in cement paste, our experiment is designed to monitor the self-healing process of microcracks in cement paste continuously by using optical microscope. The healing products are quantified by image analysis with newly implemented software in MATLAB. The results indicate that the microcracks are not filled evenly along the crack length and most healing products are Ca(OH)2, which dissolve partly from the paste matrix and re-nucleate in the microcrack, in addition to its counterpart from the continuous hydration of unhydrated cement. Furthermore, the sample cracked at earlier age shows higher potential to heal, while the sample with smaller crack width experiences greater filling efficiency. The obtained autogenous selfhealing mechanism will be used in the future simulation.
Original languageEnglish
Title of host publicationProceedings of the International RILEM Conference Materials, Systems and Structures in Civil Engineering 2016
Subtitle of host publicationSegment on Service Life of Cement-Based Materials and Structures
EditorsM. Azenha, I. Gabrijel, D. Schlicke, T. Kanstad, O. Mejlhede Jensen
Place of PublicationLyngby, Denmark
PublisherRILEM publications S.A.R.L
Pages745-754
Number of pages10
Volume2
EditionPRO 109
ISBN (Electronic)978-2-35158-173-5
ISBN (Print)978-2-35158-171-4
Publication statusPublished - 22 Aug 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

Keywords

  • Autogenous self-healing
  • Microcracks
  • Service life prediction
  • Image analysis

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