Mechanical characterization of SRG composites according to AC434

Davide Campanini, Houman A. Hadad, Christian Carloni, Claudio Mazzotti, Antonio Nanni

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

Abstract

In the last decades, technologies and materials such as fiber reinforced polymer (FRP) have been used to strengthen different types of existing structures. More recently, composites have been developed consisting of reinforcement fabrics embedded in an inorganic mortar. These composites are known as fabric reinforced cementitious matrix (FRCM), when the fabric is made of aramid, glass, basalt, polyparaphenylene benzo-bisoxazole (PBO) or carbon fibers, and steel reinforced grout (SRG), when the fabric is made of twisted high-strength steel cords. In the United States, the characterization of FRCM/SRG systems is conducted in accordance to Acceptance Criteria AC434. According to AC434, the tensile properties of FRCM/SRG are obtained through a direct tensile test on coupons using clevis grips. The objective of this research is to discuss the applicability of the AC434 test method to determine the mechanical properties of SRG as a function of the length of the anchoring plates. SRG panels were cast and stored in a humidity chamber. After a 28-day curing period, they were cut to size and metal plates of different lengths adhered to their extremities. Results show that not all the assumptions currently made in AC434 are applicable to this type of composite. The experimental response was characterized by a trilinear stress-strain behavior. Furthermore, the cracked modulus calculated based on stress values between 60 and 90% of the ultimate stress does not accurately represent reality. Re-evaluation of this provision is of importance since the cracked modulus is used in design.

Original languageEnglish (US)
Title of host publicationMechanics of Masonry Structures Strengthened with Composite Materials III - 6th International Conference on Mechanics of Masonry Structures Strengthened with Composite Materials, MuRiCo 2019
EditorsAngelo Di Tommaso, Cristina Gentilini, Giovanni Castellazzi
PublisherTrans Tech Publications Ltd
Pages458-465
Number of pages8
ISBN (Print)9783035715651
DOIs
StatePublished - Jan 1 2019
Externally publishedYes
Event6th International Conference on Mechanics of Masonry Structures Strengthened with Composite Materials, MuRiCo6 2019 - Bologna, Italy
Duration: Jun 26 2019Jun 28 2019

Publication series

NameKey Engineering Materials
Volume817 KEM
ISSN (Print)1013-9826

Conference

Conference6th International Conference on Mechanics of Masonry Structures Strengthened with Composite Materials, MuRiCo6 2019
CountryItaly
CityBologna
Period6/26/196/28/19

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Keywords

  • AC434
  • Characterization
  • Composites
  • Concrete
  • Direct Tensile Test
  • Masonry
  • Steel Reinforced Grout (SRG)
  • Strengthening

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Campanini, D., Hadad, H. A., Carloni, C., Mazzotti, C., & Nanni, A. (2019). Mechanical characterization of SRG composites according to AC434. In A. Di Tommaso, C. Gentilini, & G. Castellazzi (Eds.), Mechanics of Masonry Structures Strengthened with Composite Materials III - 6th International Conference on Mechanics of Masonry Structures Strengthened with Composite Materials, MuRiCo 2019 (pp. 458-465). (Key Engineering Materials; Vol. 817 KEM). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/KEM.817.458