TY - JOUR
T1 - Green geopolymer cement with dry activator from geothermal sludge and sodium hydroxide
AU - Petrus, Himawan Tri Bayu Murti
AU - Fairuz, Faaza Ihda
AU - Sa'dan, Naala
AU - Olvianas, Muhammad
AU - Astuti, Widi
AU - Jenie, S. N.Aisyiyah
AU - Setiawan, Felix Arie
AU - Anggara, Ferian
AU - Ekaputri, Januarti Jaya
AU - Bendiyasa, I. Made
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/4/15
Y1 - 2021/4/15
N2 - Geopolymers have currently drawn great attention of scientists and engineers, mostly in the construction sector. The superior properties of geopolymer and waste valorization are the main factors of the application. To improve the workability and easiness application, a dry activator was implemented to produce a green and sustainable geopolymer. Dry activator was produced by calcining the mix of sodium hydroxide and either unwashed or washed geothermal sludge at a specified temperature. The dry activator was mixed with fly ash to produce the green geopolymer mortar. The compressive strength of the mortar was analyzed accordingly. Thus, the compressive strength as the response variable was processed with Research Surface Methodology (RSM) using minitab® 19. Meanwhile, the independent variables were the activator ratio (Na2O/SiO2) and the calcination temperature 400, 500, and 650 °C. The optimum condition has been reached by using washed geothermal sludge calcined at 400 °C with a Na2O/SiO2 ratio of 0.692 with 27.5 MPa of compressive strength. A more economical and sustainable green geopolymer is the concern of geopolymer applications nowadays. The green geopolymer produces less Carbon Dioxide compared to ordinary portland cement and geopolymer (concrete and mortar) as much as 31% and 23%.
AB - Geopolymers have currently drawn great attention of scientists and engineers, mostly in the construction sector. The superior properties of geopolymer and waste valorization are the main factors of the application. To improve the workability and easiness application, a dry activator was implemented to produce a green and sustainable geopolymer. Dry activator was produced by calcining the mix of sodium hydroxide and either unwashed or washed geothermal sludge at a specified temperature. The dry activator was mixed with fly ash to produce the green geopolymer mortar. The compressive strength of the mortar was analyzed accordingly. Thus, the compressive strength as the response variable was processed with Research Surface Methodology (RSM) using minitab® 19. Meanwhile, the independent variables were the activator ratio (Na2O/SiO2) and the calcination temperature 400, 500, and 650 °C. The optimum condition has been reached by using washed geothermal sludge calcined at 400 °C with a Na2O/SiO2 ratio of 0.692 with 27.5 MPa of compressive strength. A more economical and sustainable green geopolymer is the concern of geopolymer applications nowadays. The green geopolymer produces less Carbon Dioxide compared to ordinary portland cement and geopolymer (concrete and mortar) as much as 31% and 23%.
KW - Dry activator
KW - Geopolymer
KW - Geothermal sludge
KW - Research surface methodology
KW - Waste valorization
UR - http://www.scopus.com/inward/record.url?scp=85101025722&partnerID=8YFLogxK
U2 - 10.1016/j.jclepro.2021.126143
DO - 10.1016/j.jclepro.2021.126143
M3 - Article
AN - SCOPUS:85101025722
SN - 0959-6526
VL - 293
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
M1 - 126143
ER -