A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Marginal lateritic soil stabilized with calcium carbide residue and fly ash geopolymers as a sustainable pavement base material
Two waste by-products, fly ash (FA) and calcium carbide residue (CCR), are used to develop geopolymer binders for stabilizing marginal lateritic soil as a sustainable pavement base. The liquid alkaline activator is a mixture of sodium silicate solution ([Na.sub.2]Si[O.sub.3]) and sodium hydroxide (NaOH) at a concentration of 10 molars. Unconfined compressive strength (UCS) and scanning electron microscopy (SEM) images of lateritic soil--FA geopolymers at different influential factors (curing times, [Na.sub.2]Si[O.sub.3]:NaOH ratios, and CCR replacement ratios) are measured. The soaked 7-day UCS of lateritic soil-FA geopolymers meets the strength requirement for both light and heavy traffic pavement specified by the local national authorities. The early 7-day UCS and cementitious products increase with increasing CCR replacement ratio, and the cementitious products are clearly observed at CCR = 30% (the highest CCR replacement ratio tested). However, the CCR replacement ratio providing the maximum 90-day strength is found at 20%. FA particles in lateritic soil--FA geopolymer at excessive CCR replacement ratio of 30% are evidently spongy and cracked because of early aluminosilicate gel precipitation and generated heat, hence the subsequent reduced strength. The CCR replacement is recommended for low NaOH geopolymer binder ([Na.sub.2]Si[O.sub.3]:NaOH ratios [less than or equal to] 90:10) at 20%. This research seeks to enable CCR traditionally destined for landfill to be used as a promoter in geopolymer binder, which is significant in addressing the sustainable usage of CCR from engineering, economical, and environmental perspectives. DOI: 10.1061/(ASCE)MT.1943-5533.0001708.
Marginal lateritic soil stabilized with calcium carbide residue and fly ash geopolymers as a sustainable pavement base material
Two waste by-products, fly ash (FA) and calcium carbide residue (CCR), are used to develop geopolymer binders for stabilizing marginal lateritic soil as a sustainable pavement base. The liquid alkaline activator is a mixture of sodium silicate solution ([Na.sub.2]Si[O.sub.3]) and sodium hydroxide (NaOH) at a concentration of 10 molars. Unconfined compressive strength (UCS) and scanning electron microscopy (SEM) images of lateritic soil--FA geopolymers at different influential factors (curing times, [Na.sub.2]Si[O.sub.3]:NaOH ratios, and CCR replacement ratios) are measured. The soaked 7-day UCS of lateritic soil-FA geopolymers meets the strength requirement for both light and heavy traffic pavement specified by the local national authorities. The early 7-day UCS and cementitious products increase with increasing CCR replacement ratio, and the cementitious products are clearly observed at CCR = 30% (the highest CCR replacement ratio tested). However, the CCR replacement ratio providing the maximum 90-day strength is found at 20%. FA particles in lateritic soil--FA geopolymer at excessive CCR replacement ratio of 30% are evidently spongy and cracked because of early aluminosilicate gel precipitation and generated heat, hence the subsequent reduced strength. The CCR replacement is recommended for low NaOH geopolymer binder ([Na.sub.2]Si[O.sub.3]:NaOH ratios [less than or equal to] 90:10) at 20%. This research seeks to enable CCR traditionally destined for landfill to be used as a promoter in geopolymer binder, which is significant in addressing the sustainable usage of CCR from engineering, economical, and environmental perspectives. DOI: 10.1061/(ASCE)MT.1943-5533.0001708.
Marginal lateritic soil stabilized with calcium carbide residue and fly ash geopolymers as a sustainable pavement base material
2017
Article (Journal)
English
BKL:
56.45
Baustoffkunde
Local classification TIB:
535/6520/6525/xxxx
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