TY - JOUR
T1 - Physical-mechanical properties of fly ash/GGBFS geopolymer composites with recycled aggregates
AU - Hu, Yong
AU - Tang, Zhuo
AU - Li, Wengui
AU - Li, Yunan
AU - Tam, Vivian W. Y.
PY - 2019
Y1 - 2019
N2 - The properties of fly ash and ground granulated blast furnace slag (GGBFS) combination based geopolymer composites containing recycled aggregate are investigated in this study, which obtained from construction and demolition wastes. The effects of recycled aggregate replacement and GGBFS inclusion on the physical and mechanical properties of geopolymer composites were investigated in this study. The scanning electron microscopic (SEM) were conducted to provide a thorough insight into the characterization of microstructures. The results reveal that using recycled aggregate has an insignificant impact on workability and setting time, while it causes a reduction in physical and mechanical properties. The inclusion of GGBFS reduces workability and setting time. However, improved physical and mechanical properties can be achieved in the geopolymer composites after the incorporation of GGBFS, and this effect is more prominent in the geopolymer composites containing recycled aggregates. The water absorption and sorptivity exhibit a strong correlation with the volume of permeable voids of geopolymer composites. Besides, very good relationships were established between the compressive strength and other mechanical properties, and these relationships fitted reasonably well with the other predictions.
AB - The properties of fly ash and ground granulated blast furnace slag (GGBFS) combination based geopolymer composites containing recycled aggregate are investigated in this study, which obtained from construction and demolition wastes. The effects of recycled aggregate replacement and GGBFS inclusion on the physical and mechanical properties of geopolymer composites were investigated in this study. The scanning electron microscopic (SEM) were conducted to provide a thorough insight into the characterization of microstructures. The results reveal that using recycled aggregate has an insignificant impact on workability and setting time, while it causes a reduction in physical and mechanical properties. The inclusion of GGBFS reduces workability and setting time. However, improved physical and mechanical properties can be achieved in the geopolymer composites after the incorporation of GGBFS, and this effect is more prominent in the geopolymer composites containing recycled aggregates. The water absorption and sorptivity exhibit a strong correlation with the volume of permeable voids of geopolymer composites. Besides, very good relationships were established between the compressive strength and other mechanical properties, and these relationships fitted reasonably well with the other predictions.
KW - aggregates (building materials)
KW - construction and demolition debris
KW - materials
KW - mechanical properties
KW - microstructure
KW - recycled products
UR - http://handle.westernsydney.edu.au:8081/1959.7/uws:52738
U2 - 10.1016/j.conbuildmat.2019.07.211
DO - 10.1016/j.conbuildmat.2019.07.211
M3 - Article
SN - 0950-0618
VL - 226
SP - 139
EP - 151
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -