Alkali-activated cements and mortars based on blast furnace slag and red clay brick waste |
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| Affiliation: | 1. School of Mineral Resources Engineering, Technical University of Crete, 73100 Chania, Greece;2. School of Mining and Metallurgical Engineering, National Technical University of Athens, Zografos Campus, 15780 Athens, Greece;1. State University of Santa Catarina (UDESC), Center of Technological Sciences, Materials Science and Engineering Post-graduation Program, 89219-710 Joinville, SC, Brazil;2. State University of Santa Catarina (UDESC), Center of Technological Sciences, Department of Civil Engineering, 89219-710 Joinville, SC, Brazil;3. Federal University of Santa Catarina (UFSC), Center of Mobility Engineering, 89218-000 Joinville, SC, Brazil;4. University of Aveiro, Department of Materials and Ceramic Engineering (CICECO), 3810-193 Aveiro, Portugal;1. Faculty of Civil Engineering, Brno University of Technology, Veveří 95, 602 00 Brno, Czech Republic;2. Faculty of Civil Engineering and Architecture, Opole University of Technology, Katowicka 48, 45-061 Opole, Poland |
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| Abstract: | This study investigates the effects of adding various concentrations, sources and compositions of ground red clay brick waste (RCBW) on the properties of fresh and hardened pastes and mortars of alkali-activated slag. The method used to grind the granulated blast furnace slag (GBFS) and RCBW (separate and conjoint) is also assessed, along with the fineness (300–900 m2/kg) of the blended alkali-activated GBFS-RCBW cement, the alkali activator (sodium carbonate or sodium silicate) and the curing conditions (normal conditions or steam curing). The water requirement and setting time for the fresh pastes are also considered; and in the case of the hardened paste and mortar, the water absorption, density and compressive/flexural strength are measured after 1, 3, 7 and 28 days of aging. From the results obtained, it is demonstrated that the addition of 40% RCBW improves the 7- and 28-day strength of blended alkali-activated slag pastes and mortars, and can replace up to 60% of the slag without losing strength. |
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