Cement-based matrix-grid system for masonry rehabilitation

C. M. Aldea, B. Mobasher, N. Jain

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Scopus citations

Abstract

The research presented in this paper focuses on a cement-based matrix-grid (CMG) system developed for masonry rehabilitation. The objectives of the research and development program were to determine the mechanical properties of the CMG system and to assess its effectiveness for improving unreinforced masonry (URM) wall seismic performance from a load bearing capacity and deflection limits point of view. CMG system is a composite consisting of a sequence of layers of cement-based matrix and alkali resistant (AR) glass coated reinforcing grid. The experimental program included materials and structural tests. Tensile and flexural tests were carried out on unaged and aged composite to assess its long term durability up to the equivalent of approximately 129 years service life. Selected tensile test results are presented in this paper, whereas full details of materials tests are presented in a separate paper. Structural tests included in-plane shear concrete masonry unit (CMU) walls. Three composite configurations were explored and the results were compared with those obtained using various fiber reinforced polymer (FRP) systems overlay configurations also tested in in-plane shear. Retention of tensile properties over time was approximately 75-80% after the equivalent of approximately 50 years service life. Structural test results demonstrated the ability of the cement-based system to strengthen the walls, and showed superior performance of field CMG system compared to FRP alternatives. X-cracking failures were observed, there was no delamination of the system from the CMU walls, and the system held the masonry pier together at failure. Due to its advantages and unique properties this system is a potential alternative to traditional and new FRP masonry rehabilitation and strengthening techniques.

Original languageEnglish (US)
Title of host publicationThin Fiber and Textile Reinforced Cementitious Systems
EditorsCorina-Maria Alde
PublisherAmerican Concrete Institute
Pages141-156
Number of pages16
ISBN (Electronic)9780870312304
StatePublished - May 1 2007
Externally publishedYes
EventThin Fiber and Textile Reinforced Cementitious Systems at the ACI Spring 2005 Convention - New York, United States
Duration: Apr 17 2005Apr 20 2005

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-244
ISSN (Print)0193-2527

Conference

ConferenceThin Fiber and Textile Reinforced Cementitious Systems at the ACI Spring 2005 Convention
Country/TerritoryUnited States
CityNew York
Period4/17/054/20/05

Keywords

  • AR-glass
  • Aging
  • Coated grid
  • Glass fibers
  • In-plane shear
  • Masonry walls
  • Rehabilitation
  • Strengthening

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science

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