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This research evaluates the fracture behavior of concrete with reactive magnesium oxide (MgO). Replacing cement with MgO is an attractive option for the concrete industry, mainly due to sustainability benefits and reduction of shrinkage. Four different MgO’s from Australia, Canada, and Spain were used in the concrete mixes, as a partial substitute of cement, at 5%, 10%, and 20% (by weight). The fracture toughness (KI) intensity factor and the stress–strain softening parameters of the wedge split test were evaluated after 28 days. The experimental results showed that the replacement of cement with MgO reduced the fracture energy between 13% and 53%. Moreover, the fracture energy was found to be correlated with both compressive strength and modulus of elasticity. A well-defined relationship between these properties is important for an adequate prediction of the non-linear behavior of reinforced concrete structures made with partial replacement of cement with MgO.
J. Forero; M. Bravo; J. Pacheco; J. de Brito; L. Evangelista. Fracture Behaviour of Concrete with Reactive Magnesium Oxide as Alternative Binder. Applied Sciences 2021, 11, 2891 .
AMA StyleJ. Forero, M. Bravo, J. Pacheco, J. de Brito, L. Evangelista. Fracture Behaviour of Concrete with Reactive Magnesium Oxide as Alternative Binder. Applied Sciences. 2021; 11 (7):2891.
Chicago/Turabian StyleJ. Forero; M. Bravo; J. Pacheco; J. de Brito; L. Evangelista. 2021. "Fracture Behaviour of Concrete with Reactive Magnesium Oxide as Alternative Binder." Applied Sciences 11, no. 7: 2891.
This paper intends to analyze the performance of mortars with reactive MgO, as a sustainable alternative to cement. Six different MgOs from Australia, Canada, and Spain were used in the production of mortars as partial substitutes for cement, namely 5%, 10%, 15%, 20%, and 25% (by weight). MgOs with different levels of reactivity were used to analyze its influence on the performance of MgO mortars. In order to evaluate the mechanical performance of these mortars, compressive strength, flexural strength, dynamic modulus of elasticity, and ultrasonic pulse velocity tests were performed. Compressive strength tests showed that the use of 25% reactive MgO can cause a decrease of this property of between 28% and 49%. The use of reactive MgO affected the other mechanical properties less. This paper also intends to analyze the durability performance of mortars with reactive MgO. To that effect, water absorption by capillarity was assessed. In this research, the effect of using MgO on the shrinkage was also analyzed. It was found that shrinkage may decrease by more than a half in some cases.
Miguel Bravo; Javier Forero; José Nobre; Jorge de Brito; Luís Evangelista. Performance of Mortars with Commercially-Available Reactive Magnesium Oxide as Alternative Binder. Materials 2021, 14, 938 .
AMA StyleMiguel Bravo, Javier Forero, José Nobre, Jorge de Brito, Luís Evangelista. Performance of Mortars with Commercially-Available Reactive Magnesium Oxide as Alternative Binder. Materials. 2021; 14 (4):938.
Chicago/Turabian StyleMiguel Bravo; Javier Forero; José Nobre; Jorge de Brito; Luís Evangelista. 2021. "Performance of Mortars with Commercially-Available Reactive Magnesium Oxide as Alternative Binder." Materials 14, no. 4: 938.
This study aims to evaluate the potential of incorporating fly ash (FA) and municipal solid waste incinerator bottom ash (MIBA) as a partial substitute of cement in the production of self-compacting concrete mixes through an experimental campaign in which four replacement levels (i.e., 10% FA + 20% MIBA, 20% FA + 10% MIBA, 20% FA + 40% MIBA and 40% FA + 20% MIBA, apart from the reference concrete) were considered. Compressive and tensile strengths, Young’s modulus, ultra-sonic pulse velocity, shrinkage, water absorption by immersion, chloride diffusion coefficient and electrical resistivity were evaluated for all concrete mixes. The results showed a considerable decline in both mechanical and durability-related performances of self-compacting concrete with 60% of substitution by MIBA mainly due to the aluminium corrosion chemical reaction. However, workability properties were not significantly affected, exhibiting values similar to those of the control mix.
B. Simões; P. R. Da Silva; R. V. Silva; Y. Avila; J. A. Forero. Ternary Mixes of Self-Compacting Concrete with Fly Ash and Municipal Solid Waste Incinerator Bottom Ash. Applied Sciences 2020, 11, 107 .
AMA StyleB. Simões, P. R. Da Silva, R. V. Silva, Y. Avila, J. A. Forero. Ternary Mixes of Self-Compacting Concrete with Fly Ash and Municipal Solid Waste Incinerator Bottom Ash. Applied Sciences. 2020; 11 (1):107.
Chicago/Turabian StyleB. Simões; P. R. Da Silva; R. V. Silva; Y. Avila; J. A. Forero. 2020. "Ternary Mixes of Self-Compacting Concrete with Fly Ash and Municipal Solid Waste Incinerator Bottom Ash." Applied Sciences 11, no. 1: 107.
The present study investigated the use of sludge ash from water treatment plants as supplementary cementing material, elaborating hydraulic mortars with different levels of cement replacement by sludge ash (10 wt% and 30 wt%) and different temperatures of calcination (600 °C and 800 °C). Characterization of sludge ash and mortars includes XRF, XRD, particle size distribution by laser diffraction, compressive strength, and SEM-EDS. The results show that SiO2, Al2O3, and Fe2O3 compose 90 % of the sludge ash, and it has potential pozzolanic activity. It is evidenced that there is a significant influence of the variable ratio of sludge ash:cement in the compressive strength of the mortar cubes over other variables. Overall, this study showed that the sludge ash could be considered as a viable and sustainable alternative for the construction sector. Despite the benefits of the suggested replacement, the presence of amorphous SiO2 requires a review of long-time chemical behavior.
Kevin Bohórquez González; Emmanuel Pacheco; Andrés Guzmán; Yoleimy Avila Pereira; Heidis Cano Cuadro; Javier A.F. Valencia. Use of sludge ash from drinking water treatment plant in hydraulic mortars. Materials Today Communications 2020, 23, 100930 .
AMA StyleKevin Bohórquez González, Emmanuel Pacheco, Andrés Guzmán, Yoleimy Avila Pereira, Heidis Cano Cuadro, Javier A.F. Valencia. Use of sludge ash from drinking water treatment plant in hydraulic mortars. Materials Today Communications. 2020; 23 ():100930.
Chicago/Turabian StyleKevin Bohórquez González; Emmanuel Pacheco; Andrés Guzmán; Yoleimy Avila Pereira; Heidis Cano Cuadro; Javier A.F. Valencia. 2020. "Use of sludge ash from drinking water treatment plant in hydraulic mortars." Materials Today Communications 23, no. : 100930.