Cement-based matrix-grid system for masonry rehabilitation

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

Cement-based matrix-grid system for masonry rehabilitation

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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 language	English (US)
Title of host publication	Thin Fiber and Textile Reinforced Cementitious Systems
Editors	Corina-Maria Alde
Publisher	American Concrete Institute
Pages	141-156
Number of pages	16
ISBN (Electronic)	9780870312304
State	Published - May 1 2007
Externally published	Yes
Event	Thin Fiber and Textile Reinforced Cementitious Systems at the ACI Spring 2005 Convention - New York, United States Duration: Apr 17 2005 → Apr 20 2005

Publication series

Name	American Concrete Institute, ACI Special Publication
Volume	SP-244
ISSN (Print)	0193-2527

Conference

Conference	Thin Fiber and Textile Reinforced Cementitious Systems at the ACI Spring 2005 Convention
Country/Territory	United States
City	New York
Period	4/17/05 → 4/20/05

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
Materials Science(all)

Cite this

Cement-based matrix-grid system for masonry rehabilitation. / Aldea, C. M.; Mobasher, B.; Jain, N.
Thin Fiber and Textile Reinforced Cementitious Systems. ed. / Corina-Maria Alde. American Concrete Institute, 2007. p. 141-156 (American Concrete Institute, ACI Special Publication; Vol. SP-244).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Aldea, CM, Mobasher, B & Jain, N 2007, Cement-based matrix-grid system for masonry rehabilitation. in C-M Alde (ed.), Thin Fiber and Textile Reinforced Cementitious Systems. American Concrete Institute, ACI Special Publication, vol. SP-244, American Concrete Institute, pp. 141-156, Thin Fiber and Textile Reinforced Cementitious Systems at the ACI Spring 2005 Convention, New York, United States, 4/17/05.

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keywords = "AR-glass, Aging, Coated grid, Glass fibers, In-plane shear, Masonry walls, Rehabilitation, Strengthening",

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N2 - 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.

AB - 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.

KW - AR-glass

KW - Aging

KW - Coated grid

KW - Glass fibers

KW - In-plane shear

KW - Masonry walls

KW - Rehabilitation

KW - Strengthening

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M3 - Conference contribution

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T3 - American Concrete Institute, ACI Special Publication

SP - 141

EP - 156

BT - Thin Fiber and Textile Reinforced Cementitious Systems

A2 - Alde, Corina-Maria

PB - American Concrete Institute

T2 - Thin Fiber and Textile Reinforced Cementitious Systems at the ACI Spring 2005 Convention

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ER -

Cement-based matrix-grid system for masonry rehabilitation

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

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