TY - JOUR
T1 - Fracture properties of slag/fly ash-based geopolymer concrete cured in ambient temperature
AU - Ding, Yao
AU - Shi, Cai Jun
AU - Li, Ning
N1 - Funding Information:
The authors are grateful for the financial support received from the National Science Foundation of China (NSFC) Project Nos. 51638008 and Construction Industry Council Fund (Project code: K-ZJK2).
Publisher Copyright:
© 2018
PY - 2018/11/30
Y1 - 2018/11/30
N2 - Slag/fly ash (FA)-based geopolymer cured in ambient temperature as a green alternative to Portland cement is attracting increasing attentions. The fracture properties of slag/FA-based geopolymer concrete (SFGC) was studied by conducting three-point bending (TPB) tests on precut beams. The effects of material parameters including the alkali concentration, the modulus of alkali activator, the slag/FA mass ratio and the liquid/binder ratio on the fracture properties of SFGC were assessed. The results exhibit that the fracture behaviors of SFGC are influenced significantly by the material parameters. The fracture energy and the ultimate load of TPB tests of SFGC beams increase with the increase of the alkali concentration, the modulus of alkali activator as well as the slag/FA ratio while decrease with the increase of liquid/binder ratio. The Bažant and Becq-Giraduon model predicts well whereas the CEB-FIP model underestimates the fracture energy of SFGC beams. Besides, the characteristic length of SFGC decreases with the increase of compressive strength regardless of the mix proportion, and is higher than the prediction for Portland cement concrete (PCC) given the similar compressive strength, suggesting that SFGC might be more ductile. In addition, the relationships between compressive strength, splitting tensile strength, elastic modulus and material parameters of SFGC specimens are also discussed.
AB - Slag/fly ash (FA)-based geopolymer cured in ambient temperature as a green alternative to Portland cement is attracting increasing attentions. The fracture properties of slag/FA-based geopolymer concrete (SFGC) was studied by conducting three-point bending (TPB) tests on precut beams. The effects of material parameters including the alkali concentration, the modulus of alkali activator, the slag/FA mass ratio and the liquid/binder ratio on the fracture properties of SFGC were assessed. The results exhibit that the fracture behaviors of SFGC are influenced significantly by the material parameters. The fracture energy and the ultimate load of TPB tests of SFGC beams increase with the increase of the alkali concentration, the modulus of alkali activator as well as the slag/FA ratio while decrease with the increase of liquid/binder ratio. The Bažant and Becq-Giraduon model predicts well whereas the CEB-FIP model underestimates the fracture energy of SFGC beams. Besides, the characteristic length of SFGC decreases with the increase of compressive strength regardless of the mix proportion, and is higher than the prediction for Portland cement concrete (PCC) given the similar compressive strength, suggesting that SFGC might be more ductile. In addition, the relationships between compressive strength, splitting tensile strength, elastic modulus and material parameters of SFGC specimens are also discussed.
KW - Ambient temperature curing
KW - Fracture property
KW - Mechanical property
KW - Slag/FA-based geopolymer concrete (SFGC)
KW - Three-point bending (TPB) test
UR - http://www.scopus.com/inward/record.url?scp=85054013779&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2018.09.138
DO - 10.1016/j.conbuildmat.2018.09.138
M3 - Article
AN - SCOPUS:85054013779
SN - 0950-0618
VL - 190
SP - 787
EP - 795
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -