Journal of Materials Science

, Volume 43, Issue 4, pp 1278–1285 | Cite as

Relationship between aggregate microstructure and mortar expansion. A case study of deformed granitic rocks from the Santa Rosa mylonite zone

  • Hans-Rudolf WenkEmail author
  • P. J. M. Monteiro
  • K. Shomglin


It is shown that the deformation state of a granitic rock has a profound impact on the long-term stability of concrete, if used as aggregate due to enhanced susceptibility to the alkali-silica reaction. An investigation of the microstructure of granitic rocks from the Santa Rosa mylonite zone in southern California with transmission electron microscopy and neutron diffraction revealed that, as these rocks become progressively deformed from granite to mylonite and phyllonite, accompanied by grain size reduction, the dislocation density in quartz (investigated with TEM) increases and preferred orientation of biotite (determined by neutron diffraction) becomes stronger. While the contribution of dislocations to the bulk energy increase of quartz is low, dislocations provide favorable sites for dissolution and precipitation to occur. A comparison with ASTM C 1260 expansion tests of these same samples indicates that expansion increases with the dislocation density.


Dislocation Density Prefer Orientation Pole Figure Granitic Rock Mylonite Zone 



The authors acknowledge access to neutron scattering facilities at Institut Laue-Langevin in Grenoble and the Lujan Center, Los Alamos National Laboratory, as well as transmission electron microscopes at the National Center for Electron Microscopy at Lawrence Berkeley National Laboratory. We also are appreciative for financial support from the National Science Foundation grant CMS 062464 and EAR 0337006.


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Hans-Rudolf Wenk
    • 1
    Email author
  • P. J. M. Monteiro
    • 2
  • K. Shomglin
    • 1
  1. 1.Department of Earth and Planetary ScienceUniversity of CaliforniaBerkeleyUSA
  2. 2.Department of Civil and Environmental EngineeringUniversity of CaliforniaBerkeleyUSA

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