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Mortars of alkali-activated blast furnace slag with high aggregate:binder ratios
Highlights Mortars of high aggregate:binder ratios with alkali activated blast furnace slag were investigated. Previous reports on similar mortar composition were not found. Conditions included low alkali concentration to reduce cost and problems associated to alkalis. Low water/binder ratios were used in mortars of semi-dry consistency for precast products. The implications of the above are related to strength development and reactivity of the slag.
Abstract Mortars with high aggregate:binder ratios of 10:1 and 8:1 were investigated with binders of blast furnace slag activated with 2.5%, 3.4%, 4.5%, and 6.5% Na2O relative to the mass of slag and using sodium silicate solutions with moduli SiO2/Na2O of 1.3, 1.5, 1.7, 2.0 and 2.2. The mortars were formulated at low water/binder ratio in semi-dry mixes to produce bricks. The modulus of 1.7 was chosen as most adequate and the effects of the % Na2O and temperature, on strength development, were then investigated. Various formulations showed compressive strength useful for construction, where mortars with aggregate:binder of 8:1, activated with 3.5% Na2O and cured at 60°C registered 20MPa at 28days, while mortars with 8:1 and 10:1 with 6% Na2O cured at 20°C reached 20 and 13.3MPa, respectively.
Mortars of alkali-activated blast furnace slag with high aggregate:binder ratios
Highlights Mortars of high aggregate:binder ratios with alkali activated blast furnace slag were investigated. Previous reports on similar mortar composition were not found. Conditions included low alkali concentration to reduce cost and problems associated to alkalis. Low water/binder ratios were used in mortars of semi-dry consistency for precast products. The implications of the above are related to strength development and reactivity of the slag.
Abstract Mortars with high aggregate:binder ratios of 10:1 and 8:1 were investigated with binders of blast furnace slag activated with 2.5%, 3.4%, 4.5%, and 6.5% Na2O relative to the mass of slag and using sodium silicate solutions with moduli SiO2/Na2O of 1.3, 1.5, 1.7, 2.0 and 2.2. The mortars were formulated at low water/binder ratio in semi-dry mixes to produce bricks. The modulus of 1.7 was chosen as most adequate and the effects of the % Na2O and temperature, on strength development, were then investigated. Various formulations showed compressive strength useful for construction, where mortars with aggregate:binder of 8:1, activated with 3.5% Na2O and cured at 60°C registered 20MPa at 28days, while mortars with 8:1 and 10:1 with 6% Na2O cured at 20°C reached 20 and 13.3MPa, respectively.
Mortars of alkali-activated blast furnace slag with high aggregate:binder ratios
Burciaga-Díaz, O. (author) / Díaz-Guillén, M.R. (author) / Fuentes, A.F. (author) / Escalante-Garcia, J.I. (author)
Construction and Building Materials ; 44 ; 607-614
2013-01-01
8 pages
Article (Journal)
Electronic Resource
English
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