0
  • DE
  • EN
  • FR
  • International Database and Gallery of Structures

Advertisement

How to deal with Structures affected by Delayed Ettringite Formation

 How to deal with Structures affected by Delayed Ettringite Formation
Author(s):
Presented at IABSE Congress: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, Stockholm, Sweden, 21-23 September 2016, published in , pp. 935-942
DOI: 10.2749/stockholm.2016.0922
Price: € 25.00 incl. VAT for PDF document  
ADD TO CART
Download preview file (PDF) 0.21 MB

The expansive sulphate internal reaction of concrete due to Delayed Ettringite Formation (DEF) can damage concrete structures severely. DEF is defined as the formation of ettringite in a concrete a...
Read more

Bibliographic Details

Author(s): (Paris-Est University, IFSTTAR, Champs sur Marne, France)
Medium: conference paper
Language(s): English
Conference: IABSE Congress: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, Stockholm, Sweden, 21-23 September 2016
Published in:
Page(s): 935-942 Total no. of pages: 8
Page(s): 935-942
Total no. of pages: 8
Year: 2016
DOI: 10.2749/stockholm.2016.0922
Abstract:

The expansive sulphate internal reaction of concrete due to Delayed Ettringite Formation (DEF) can damage concrete structures severely. DEF is defined as the formation of ettringite in a concrete after setting, and without any external sulphate supply, but with water supply. This phenomenon occurs in concretes exposed to frequent humidity or contact to water, and subjected to a relatively high thermal treatment (> 65°C) or having reached high temperatures during casting. This reaction may cause large structural disorders due to unexpected deformations and additional stresses in concrete and reinforcement, and the problem is therefore to know how to deal with such structures affected by DEF. The prediction of future deterioration, the appraisal methodology and the assessment of the efficiency of remedial operations are crucial points for existing affected structures whose serviceability and structural safety may constitute a serious concern.

Keywords:
concrete structure delayed ettringite formation disorder appraisal treatment