Abstract
Conventional steel-reinforced ordinary Portland cement concrete is prone to corrosion. Geopolymer concrete is a new durable cementitious material, and the glass fibre-reinforced polymer (GFRP) is an attractive alternative to steel because of GFRP's compelling physical and mechanical properties, corrosion resistance and electromagnetic transparency. This study investigates the structural properties of 11 air-cured square geopolymer concrete columns reinforced with GFRP bars at various stirrup spacings of 50, 100 and 150 mm. The specimens were tested under varying loading conditions to generate interaction diagrams for comparison with theoretical predictions from existing codes and standards. Effective confinement and higher ductility were achieved by reducing the stirrup spacing. High strains indicating buckling or rupture of the longitudinal GFRP bars and confinement of the core were measured. The comparison between the experimental data and design codes showed that the load-carrying capacity of the columns were favourably under-predicted from a design viewpoint when the compressive GFRP bars were excluded. The strength of the concentrically loaded columns was up to 39·6% higher than the code predictions. The GFRP-reinforced geopolymer concrete columns showed a 10·8% average increment in the load-carrying capacity over their plain concrete sections.
| Original language | English |
|---|---|
| Pages (from-to) | 1006-1024 |
| Number of pages | 19 |
| Journal | Magazine of Concrete Research |
| Volume | 71 |
| Issue number | 19 |
| DOIs | |
| Publication status | Published - 1 Oct 2019 |
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Behaviour and design of air-cured GFRP-reinforced geopolymer concrete square columns. / Elchalakani, Mohamed; Dong, Minhao; Karrech, Ali; Li, Gang; Ali, Mohamed Sadakkathulla Mohamed; Manalo, Allan.
In: Magazine of Concrete Research, Vol. 71, No. 19, 01.10.2019, p. 1006-1024.Research output: Contribution to journal › Article
TY - JOUR
T1 - Behaviour and design of air-cured GFRP-reinforced geopolymer concrete square columns
AU - Elchalakani, Mohamed
AU - Dong, Minhao
AU - Karrech, Ali
AU - Li, Gang
AU - Ali, Mohamed Sadakkathulla Mohamed
AU - Manalo, Allan
PY - 2019/10/1
Y1 - 2019/10/1
N2 - Conventional steel-reinforced ordinary Portland cement concrete is prone to corrosion. Geopolymer concrete is a new durable cementitious material, and the glass fibre-reinforced polymer (GFRP) is an attractive alternative to steel because of GFRP's compelling physical and mechanical properties, corrosion resistance and electromagnetic transparency. This study investigates the structural properties of 11 air-cured square geopolymer concrete columns reinforced with GFRP bars at various stirrup spacings of 50, 100 and 150 mm. The specimens were tested under varying loading conditions to generate interaction diagrams for comparison with theoretical predictions from existing codes and standards. Effective confinement and higher ductility were achieved by reducing the stirrup spacing. High strains indicating buckling or rupture of the longitudinal GFRP bars and confinement of the core were measured. The comparison between the experimental data and design codes showed that the load-carrying capacity of the columns were favourably under-predicted from a design viewpoint when the compressive GFRP bars were excluded. The strength of the concentrically loaded columns was up to 39·6% higher than the code predictions. The GFRP-reinforced geopolymer concrete columns showed a 10·8% average increment in the load-carrying capacity over their plain concrete sections.
AB - Conventional steel-reinforced ordinary Portland cement concrete is prone to corrosion. Geopolymer concrete is a new durable cementitious material, and the glass fibre-reinforced polymer (GFRP) is an attractive alternative to steel because of GFRP's compelling physical and mechanical properties, corrosion resistance and electromagnetic transparency. This study investigates the structural properties of 11 air-cured square geopolymer concrete columns reinforced with GFRP bars at various stirrup spacings of 50, 100 and 150 mm. The specimens were tested under varying loading conditions to generate interaction diagrams for comparison with theoretical predictions from existing codes and standards. Effective confinement and higher ductility were achieved by reducing the stirrup spacing. High strains indicating buckling or rupture of the longitudinal GFRP bars and confinement of the core were measured. The comparison between the experimental data and design codes showed that the load-carrying capacity of the columns were favourably under-predicted from a design viewpoint when the compressive GFRP bars were excluded. The strength of the concentrically loaded columns was up to 39·6% higher than the code predictions. The GFRP-reinforced geopolymer concrete columns showed a 10·8% average increment in the load-carrying capacity over their plain concrete sections.
KW - composite materials
KW - failure
KW - fibre-reinforced concrete
UR - http://www.scopus.com/inward/record.url?scp=85068910261&partnerID=8YFLogxK
U2 - 10.1680/jmacr.17.00534
DO - 10.1680/jmacr.17.00534
M3 - Article
VL - 71
SP - 1006
EP - 1024
JO - Magazine of Concrete Research
JF - Magazine of Concrete Research
SN - 0024-9831
IS - 19
ER -