Influence of recycled aggregate on fly ash geopolymer concrete properties. (20th January 2016)

• Record Type: Journal Article
• Authors: Nuaklong, Peem; Sata, Vanchai; Chindaprasirt, Prinya
• Is Part Of: Journal of cleaner production. Volume 112:Part 4(2016:Jan.)
• Page Start: 2300
• Page End: 2307
• Publication Date: 2016-01-20
• Subjects: Recycled aggregate -- High calcium fly ash -- Geopolymer concrete -- Mechanical properties -- Durability; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2015.10.109
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Geopolymer binder and recycled aggregate are environment friendly products and is thus considered as part of sustainable development. This paper presents a study of the effect of recycled aggregate on strength and durability of fly ash based geopolymer concrete. Geopolymer concrete samples were prepared from high calcium fly ash, sodium silicate solution, sodium hydroxide solution, fine aggregate from river sand, and two types of coarse aggregate viz., recycled concrete aggregate and crushed limestone coarse aggregate. Test results indicated that recycled concrete aggregate can be used as a coarse aggregate in high calcium fly ash geopolymer concretes with the 7-day compressive strengths of 30.6–38.4 MPa which were slightly lower than those of high calcium fly ash geopolymer concretes containing crushed limestone. The use of high sodium hydroxide concentrations of 12 and 16 M resulted in better performances both in strength and durability than that of 8 M. Highlights: We tested fly ash geopolymer concrete containing recycled concrete aggregate (RCA). RCA can be used as a coarse aggregate in high calcium fly ash geopolymer concrete. Relatively high compressive strengths of 30.6–38.4 MPa were obtained. Durability of RCA geopolymer concretes were similar to normal limestone geopolymer concrete.