Durability of fibre reinforced cementitious composites: Coupling mechanical and chloride environment loads

Ana Mafalda Matos, Stefan Chaves Figueiredo, Sandra Nunes, Erik Schlangen

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

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Abstract

Fibre reinforced cementitious composites (FRCC) may be characterized by their improved performance namely in terms of tensile ductility, accompanied by multiple cracking, and potentially lower permeability to liquid and gas in cracked state. Cracking, which is nearly inevitable, can occur due to applied structural loading, shrinkage, chemical attack, thermal deformations and restrained condition. Even though might not be a structural problem, cracking could be a durability issue, since it considerably modifies the transport properties of the cementitious composite and, as consequence, accelerates the deterioration process, which can significantly impair the long term service life of a structure or element. Literature indicates that, particularly for chloride penetration, the presence of cracks and/or load condition, causes a more deleterious attack compared to standard durability test on sound specimens composites. Contributing to that concern a methodology for accessing chloride attack in loaded and/or cracked FRCC is proposed. Cracking procedure and specimen geometry were selected, considering that cracks produced in laboratory should resemble those in structural elements (beams). Thus, FRCC specimens were firstly pre-loaded under four point bending up to a pre-defined crack width. The crack width was kept using special stainless steel frame. In addition, cracked but not loaded specimens were considered and sound specimens were used as reference. Then, specimens were exposed to wet-dry cycles in a chloride solution. It is argued that the chloride penetration is definitively influenced by the load and cracking conditions, which promoted a higher penetration depth leading to a severe fibres corrosion, which also compromised the mechanical performance of FRCC.
Original languageEnglish
Title of host publication4th International Conference on Service Life Design for Infrastructures
Subtitle of host publication(SLD4) 27-30 August 2018 – Delft, Netherlands
EditorsGuang Ye, Yong Yuan, Claudia Romero Rodriguez, Hongzhi Zhang, Branko Šavija
PublisherRilem
Pages721-732
ISBN (Electronic)978-2-35158-213-8
Publication statusPublished - 2018
Event4th International Conference on Service
Life Design for Infrastructures
- Delft, Netherlands
Duration: 27 Aug 201830 Aug 2018
Conference number: 4

Publication series

NameRilem proceedings
PublisherRilem
NumberPRO 125

Conference

Conference4th International Conference on Service
Life Design for Infrastructures
Abbreviated titleSLD4
CountryNetherlands
CityDelft
Period27/08/1830/08/18

Keywords

  • Efflorescence
  • cement-based exterior wall
  • mitigation
  • metakaolin

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