Mechanical properties of alkali resistant glass fabric composites for retrofitting unreinforced masonry walls

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

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

Abstract

Mechanical properties of a cement-based matrix – grid (CMG) system developed for masonry rehabilitation are discussed. 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 tension and flexural tests of composites with special consideration to long term durability. Variables studied include effect of composite thickness, fabric orientation, and effect of accelerated aging on the tensile and flexural responses. Results indicate that samples in the cross machine direction (XMD) showed the best combination of high tensile strength (in excess of 5 MPa≅0.725 ksi) and Ultimate strain value (2.36%) as compared to the machine direction (MD) with (5 MPa≅0.725 ksi and ultimate strain of 1.8%). After 28 days of accelerated aging, tensile strengths reduced to about 3.87 MPa≅0.56 ksi for the MD and XMD directions respectively, representing average reductions of 23% and 17%. In the flexural samples, cross machine samples (XMD) show a combination of high flexural strength (15-17 MPa≅2.18-2.47 ksi) and Maximum deflection (of 15-22 mm≅0.59-0.87 in) as compared to the MD samples. Higher stiffness of fabrics in the cross machine direction due to the manufacturing process was the source of such differences in behavior. The first crack strain in flexure is as much as the ultimate tensile strength in tension for many composites. A discussion of comparison of tensile and flexural stress measures is presented.

Original languageEnglish (US)
Title of host publicationThin Fiber and Textile Reinforced Cementitious Systems
EditorsCorina-Maria Alde
PublisherAmerican Concrete Institute
Pages125-140
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

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

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Mechanical properties of alkali resistant glass fabric composites for retrofitting unreinforced masonry walls'. Together they form a unique fingerprint.

Cite this