TY - JOUR
T1 - Study on engineering properties of alkali-activated ladle furnace slag geopolymer
AU - Wang, Wei Chien
AU - Wang, Her Yung
AU - Tsai, Hsin Chieh
N1 - Publisher Copyright:
© 2016
PY - 2016/10/1
Y1 - 2016/10/1
N2 - Geopolymers, a new form of aluminosilicates, are environmentally friendly materials. These materials are produced from industrial wastes. This study, based on the industrial waste, Ladle furnace slag (LFS), employed an alkali-activated technology to activate LFS. The fixed alkali modulus ratio (SiO2/Na2O) was 1. LFS Geopolymer was prepared at different liquid/solid ratios (L/S) of 0.35, 0.40 and 0.45 and with different alkali agents of 4%, 6% and 8%. The LFS Geopolymer was cured under various conditions (air and saturated limewater) to evaluate the mixture and engineering properties of LFS Geopolymer at different ages. The results show that the workability of the LFS geopolymer increased with an increasing L/S and alkali agent. Moreover, the compressive strength and ultrasonic velocity increased with an increase in the alkali agent and a decrease in L/S, but the weight loss was reduced. Therefore, the appropriate use of alkali-activated technology can activate LFS, thereby enhancing its engineering properties. Curing in saturated limewater can greatly improve the engineering properties of the geopolymer compared to air curing. Specifically, the compressive strength of LFS increases by 5.4–58.9%, and the ultrasonic velocity of LFS increases by 0.84–22.9%. The thermal conductivity increases by 0.166–0.443 W/m·K, and the overall shrinkage of LFS cured in the saturated limewater ranges between 0.0017% and 0.0342%, which is far lower than samples cured in air, thus indicating that curing in saturated limewater can effectively prevent LFS shrinkage.
AB - Geopolymers, a new form of aluminosilicates, are environmentally friendly materials. These materials are produced from industrial wastes. This study, based on the industrial waste, Ladle furnace slag (LFS), employed an alkali-activated technology to activate LFS. The fixed alkali modulus ratio (SiO2/Na2O) was 1. LFS Geopolymer was prepared at different liquid/solid ratios (L/S) of 0.35, 0.40 and 0.45 and with different alkali agents of 4%, 6% and 8%. The LFS Geopolymer was cured under various conditions (air and saturated limewater) to evaluate the mixture and engineering properties of LFS Geopolymer at different ages. The results show that the workability of the LFS geopolymer increased with an increasing L/S and alkali agent. Moreover, the compressive strength and ultrasonic velocity increased with an increase in the alkali agent and a decrease in L/S, but the weight loss was reduced. Therefore, the appropriate use of alkali-activated technology can activate LFS, thereby enhancing its engineering properties. Curing in saturated limewater can greatly improve the engineering properties of the geopolymer compared to air curing. Specifically, the compressive strength of LFS increases by 5.4–58.9%, and the ultrasonic velocity of LFS increases by 0.84–22.9%. The thermal conductivity increases by 0.166–0.443 W/m·K, and the overall shrinkage of LFS cured in the saturated limewater ranges between 0.0017% and 0.0342%, which is far lower than samples cured in air, thus indicating that curing in saturated limewater can effectively prevent LFS shrinkage.
KW - Alkali-activated paste
KW - Curing condition
KW - Geopolymer
KW - Ladle furnace slag
UR - http://www.scopus.com/inward/record.url?scp=84978870194&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2016.07.068
DO - 10.1016/j.conbuildmat.2016.07.068
M3 - 期刊論文
AN - SCOPUS:84978870194
SN - 0950-0618
VL - 123
SP - 800
EP - 805
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -