The influence of moisture on the fracture behaviour of concrete loaded in dynamic tension

Ilse Vegt, Jaap Weerheijm

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

17 Downloads (Pure)

Abstract

Dynamic tests demonstrate an extensive rate effect on the tensile strength as well as the post-peak behaviour beyond loading rates of about 50 GPa/s. One of the possible explanations for the observed rate effects on the fracture behaviour is enhanced resistance by moisture in the pores. To study the influence of the moisture content and pore structure on the rate dependency, different moisture contents and concrete types are used and tested at three loading rates. From the test results it is concluded that the moisture volume, porosity and pore structure play an important role for tensile strength as well as the fracture process. The NMR tests showed that the water in the capillary pores causes the strength increase and not the water in the gel-pores. From the analysis of the experimental results it is concluded that for loading rates < 50 GPa/s, the main cause for the observed strength increase is the viscous behaviour of concrete. For loading rates beyond 50 GPa/s, also rate effects due to limitations on crack propagation contribute to the observed strength increase for all moisture contents and concrete types. Concerning the post peak response for rates > 50 GPa/s, the additional resistance is due to additional micro cracking, the moisture in the capillary pores and the limited crack propagation velocity.
Original languageEnglish
Title of host publication9th International Conference on Fracture Mechanics of Concrete and Concrete Structures
Subtitle of host publicationBerkeley, California USA
EditorsV. Saouma, J. Bolander, E. Landis
Number of pages12
DOIs
Publication statusPublished - 2016
Event9th International Conference on Fracture Mechanics of Concrete and Concrete Structures - University of California, Berkeley, United States
Duration: 22 May 201625 May 2016
Conference number: 9
http://framcos.org/FraMCoS-9.php#gsc.tab=0

Conference

Conference9th International Conference on Fracture Mechanics of Concrete and Concrete Structures
Abbreviated titleFraMCoS-9
CountryUnited States
CityBerkeley
Period22/05/1625/05/16
Internet address

Keywords

  • rate effects
  • concrete
  • tension
  • moisture
  • experiments
  • fracture characteristics

Fingerprint

Dive into the research topics of 'The influence of moisture on the fracture behaviour of concrete loaded in dynamic tension'. Together they form a unique fingerprint.

Cite this