Effect of geothermal waste on strength and microstructure of alkali-activated slag cement mortars

Journal Article · Wed Oct 01 00:00:00 EDT 2003 · Cement and Concrete Research

DOI:https://doi.org/10.1016/S0008-8846(03)00133-9· OSTI ID:20658269

Escalante-Garcia, J I; Gorokhovsky, A V; Mendoza, G; Fuentes, A F

Mortars of blast furnace slag replaced with 10% of a geothermal silica waste were cured for 90 days. The binder was activated by 6 wt.% Na{sub 2}O equivalent of NaOH and water glass. The presence of the silica enhanced the formation of hydration products as shown by nonevaporable water (NEW) results. Backscattered electron images indicated that the microstructures of blended slag had less porosity than those of neat slag mortars and the interfacial zone between aggregate and hydration products was dense and of homogeneous composition similar to the matrix of hydration products. The main hydration products were C-S-H and for NaOH a hydrotalcite type phase was found as finely intermixed with the C-S-H.

• OSTI ID: 20658269
• Journal Information: Cement and Concrete Research, Vol. 33, Issue 10; Other Information: DOI: 10.1016/S0008-8846(03)00133-9; PII: S0008884603001339; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BLAST FURNACES
CEMENTS
ELECTRON DIFFRACTION
HYDRATION
MECHANICAL PROPERTIES
MICROSTRUCTURE
MORTARS
POROSITY
SILICA
SLAGS
SODIUM HYDROXIDES
SODIUM OXIDES
WASTES
WATER