Effect on Compressive Strength of Paste/Mortar/Concrete by Changing Bottom Ash Content and Activator pH
Geopolymer is a recently developed inorganic material that can be used to produce cement. In addition to being fire and chemical resistant, geopolymer possesses excellent mechanical properties. Geopolymeric materials are synthesized by alkaline activators such as an alumino-silicate source, which forms a gel binder phase. Toxic contaminants are also immobilized in this process. In this study, inorganic paste, different contents of MBA, and several types of activators are investigated to obtain the optimum condition. In addition, the crystalloid and crystal structure of geopolymer was analyzed by XRD and FTIR. The Korea Standard Leaching Test (KSLT) was also used to evaluate the environmental safety of inorganic paste. This study showed that the compressive strength of the WG activator is approximately twice as great as the NaOH and KOH activators. At pH 13, the WG activator also showed the best pH of the activators. In addition, the compressive strength of geopolymer concrete showed about 30 MPa in this condition. Finally, it was confirmed that all harmful heavy metals in MSWI ash were stabilized.
Jiang Feng and Yijin Wu
W. K. Lee and J. H. Lee, "Effect on Compressive Strength of Paste/Mortar/Concrete by Changing Bottom Ash Content and Activator pH", Advanced Materials Research, Vol. 742, pp. 304-309, 2013