Strengthening of small concrete columns by natural fiber reinforced polymers composites (hemp FRP and sisal FRP)

Name: Arissaman Sangthongtong

keyword: Compressive behavior

LCSH: Reinforced concrete

; Fiber reinforced polymer (FRP)

LCSH: Fiber

; Reinforced concrete (RC)

; Hemp fiber

; Sisal fiber

Abstract: During the last decade, the use of fiber reinforced polymer (FRP) composites has been successfully promoted for external confinement of reinforced concrete (RC) columns all over the world. This technique is considered superior to conventional concrete and steel jacketing methods in terms of confinement strength, post-retrofit ductility, sectional areas, weight, corrosion resistance, ease of application, and overall project costs. The existing research on FRP confined concrete column is mainly concentrated on the use of artificial fibers such as carbon, glass, aramid, PET and PEN. This research presents results of an experimental study on the behavior of axially loaded concrete columns that have been strengthened with natural fiber reinforced polymer (CFRP) composites. Both hemp and sisal natural fibers were investigated. Six series, forming a total of 90 specimens, were subjected to axial compression. All the test specimens were loaded to failure in axial compression and investigated in both axial and transverse directions. The parameters considered are the shape of cross section shape (i.e. circular, square and rectangular) ; the size of column ; the number of fiber wrap layers (i.e., two and four layers) and the fiber material such as hemp and sisal. The experimental results clearly demonstrate that the CFRP confinement enhances the compressive strength and the ductility of concrete columns. The ultimate strength and the ductility of the NFRP confined concrete increase with increasing number of confining layers. The efficiency of NFRP confinement is very sensitive to the column cross section geometry. When column sizes increase there is a reduction in ultimate stress both for NSFRP and NHFRP strengthened specimens. The NHFRP strengthening is more efficient than NSFRP

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Amorn Pimanmas

Role: advisor

Created: 2016

Modified: 2564-05-19

Issued: 2021-05-18

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2016.683

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Engineering and Technology

Grantor: Thammasat University

©copyrights Thammasat University

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