In this study the possibility of both chemical and combined chemical + thermal activation of municipal solid waste incinerator bottom ash was investigated. A number of chemical activators including Na(2)SiO(3)(.)9H(2)O, NaOH, Na2SO4 and CaCl(2)(.)2H(2)O were individually added at varying concentrations to bottom ash/Portland cement mixtures having different bottom ash contents. The effect of the selected compounds was evaluated in terms of macroscopic properties including mechanical strength and composition of cementitious materials/water slurries. The results showed that Na-based activators were not capable of improving the characteristics of the cementitious products if compared to Portland cement under both normal and accelerated curing. Conversely, the use of calcium chloride at 40degreesC-curing did promote the pozzolanic properties of bottom ash, leading to UCS values of 45.5 and 60.0 MPa after 10 and 20 days, respectively, as opposed to a value of 43.6 MPa obtained after 28 days for Portland cement under normal curing conditions. (C) 2004 Elsevier B.V. All rights reserved.
The effect of Na and Ca salts on MSWI bottom ash activation for reuse as a pozzolanic admixture / Polettini, Alessandra; Pomi, Raffaella; G., Carcani. - In: RESOURCES, CONSERVATION AND RECYCLING. - ISSN 0921-3449. - 43:4(2005), pp. 403-418. [10.1016/j.resconrec.2004.07.004]
The effect of Na and Ca salts on MSWI bottom ash activation for reuse as a pozzolanic admixture
POLETTINI, Alessandra;POMI, Raffaella;
2005
Abstract
In this study the possibility of both chemical and combined chemical + thermal activation of municipal solid waste incinerator bottom ash was investigated. A number of chemical activators including Na(2)SiO(3)(.)9H(2)O, NaOH, Na2SO4 and CaCl(2)(.)2H(2)O were individually added at varying concentrations to bottom ash/Portland cement mixtures having different bottom ash contents. The effect of the selected compounds was evaluated in terms of macroscopic properties including mechanical strength and composition of cementitious materials/water slurries. The results showed that Na-based activators were not capable of improving the characteristics of the cementitious products if compared to Portland cement under both normal and accelerated curing. Conversely, the use of calcium chloride at 40degreesC-curing did promote the pozzolanic properties of bottom ash, leading to UCS values of 45.5 and 60.0 MPa after 10 and 20 days, respectively, as opposed to a value of 43.6 MPa obtained after 28 days for Portland cement under normal curing conditions. (C) 2004 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
