Use of Slag/Sugar Cane Bagasse Ash (SCBA) Blends in the Production of Alkali-Activated Materials

Materials

Vinໜius N. Castaldelli¹  Jorge L. Akasaki¹  José L.P. Melges¹  Mauro M. Tashima¹  Lourdes Soriano²  Mar໚ V. Borrachero²  José Monzó² 

[1] UNESP–Univ Estadual Paulista, Campus de Ilha Solteira, Alameda Bahia 550, Ilha Solteira-SP CEP:15385-000, Brazil; E-Mails:;Instituto de Ciencia y Tecnología del Hormigón, Universitat Politècnica de València, Camino de Vera s/n, Edificio 4G, Valencia 46022, Spain; E-Mails:

关键词: alkali-activation;    sugar cane bagasse ash;    slag replacement;    waste valorization;    microstructure;    strength development;   

DOI  :  10.3390/ma6083108

来源: mdpi

【 摘 要 】

Blast furnace slag (BFS)/sugar cane bagasse ash (SCBA) blends were assessed for the production of alkali-activated pastes and mortars. SCBA was collected from a lagoon in which wastes from a sugar cane industry were poured. After previous dry and grinding processes, SCBA was chemically characterized: it had a large percentage of organic matter (ca. 25%). Solutions of sodium hydroxide and sodium silicate were used as activating reagents. Different BFS/SCBA mixtures were studied, replacing part of the BFS by SCBA from 0 to 40% by weight. The mechanical strength of mortar was measured, obtaining values about 60 MPa of compressive strength for BFS/SCBA systems after 270 days of curing at 20 °C. Also, microstructural properties were assessed by means of SEM, TGA, XRD, pH, electrical conductivity, FTIR spectroscopy and MIP. Results showed a good stability of matrices developed by means of alkali-activation. It was demonstrated that sugar cane bagasse ash is an interesting source for preparing alkali-activated binders.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.