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20 results on '"Miraldo, S."'

5. List of Contributors

Author

Abdollahnejad, Z., primary, Aguiar, J., additional, Castel, A., additional, Baek, C., additional, Chau, C.K., additional, Cheah, C.B., additional, Cho, M.-S., additional, Flower, D.J.M., additional, Grabiec, A.M., additional, Graubner, C.-A., additional, Hainer, S., additional, Hui, W.K., additional, Jamieson, E., additional, Jung, Y.-B., additional, Kealley, C., additional, Kheradmand, M., additional, Leung, T.M., additional, Maghsoudpour, A., additional, McLellan, B., additional, Miraldo, S., additional, Nazari, A., additional, Ng, W.Y., additional, Nikraz, H., additional, Pacheco-Torgal, F., additional, Part, W.K., additional, Penna, B., additional, Proske, T., additional, Ramli, M., additional, Rezvani, M., additional, Roh, S., additional, Sanjayan, J.G., additional, Song, J.-K., additional, Song, K.-I., additional, Szulc, J., additional, Tae, S., additional, Tae, S.-H., additional, Tahri, W., additional, Van Deventer, J.S.J., additional, van Riessen, A., additional, Wang, H., additional, Xu, J.M., additional, Yang, K.-H., additional, Yang, T., additional, Zawal, D., additional, and Zhang, Z., additional

Published
2017
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7. Contributor contact details

Author

Pacheco-Torgal, F., primary, Tam, V.W.Y., additional, Labrincha, J.A., additional, Ding, Y., additional, de Brito, J., additional, Pacheco-Torgal, F., additional, Llatas, C., additional, Hiete, M., additional, Dosal, E., additional, Viguri, J. R, additional, Andrés, A., additional, Garbarino, E., additional, Blengini, G.A., additional, Coelho, A., additional, Kamrath, P., additional, Akbarnezhad, A., additional, Ong, K.C.G., additional, Martín-Morales, M., additional, Zamorano, M., additional, Valverde-Palacios, I., additional, Cuenca-Moyano, G.M., additional, Sánchez-Roldán, Z., additional, Agrela, F., additional, Alaejos, P., additional, de Juan, M.S., additional, Richardson, A., additional, Jiménez, J.R., additional, Gómez-Meijide, B., additional, Pérez, I., additional, Tabaković, A., additional, Miraldo, S., additional, Abdollahnejad, Z., additional, Allahverdi, A., additional, Najafi Kani, E., additional, Asakura, H., additional, Gualtieri, A.F., additional, Coudert, L., additional, Blais, J-F, additional, Mercier, G., additional, Cooper, P., additional, Janin, A., additional, Mukhopadhyay, A.K., additional, Marinković, S.B., additional, Radonjanin, V., additional, Ignjatović, I., additional, Tiruta-Barna, L., additional, and Barna, R., additional

Published
2013
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12. Alkali-Activated Cement-Based Binders (AACBs) as durable and cost-competitive low-CO2 binder materials: some shortcomings that need to be adressed

Author

Pacheco-Torgal, F., Abdollahnejad, Zahra, Miraldo, S., Kheradmand, Mohammad, and Universidade do Minho

Subjects
Cost efficiency, Science & Technology, AACB, Carbon dioxide emissions, OPC, Durability
Abstract

Available online 14 October 2016., The production of 1 t of ordinary Portland cement generates 0.55 t of chemical CO2 and requires an additional 0.39 t of CO2 in fuel emissions for baking and grinding, accounting for a total of 0.94 t of CO2. The projections for the global demand of Portland cement show that by 2056 it will have doubled, reaching 6 Gt/year. Publications in the field of alkali-activated cement-based binders (AACBs) state that this new material is likely to have high potential to become an alternative to Portland cement. However, AACBs still show some shortcomings that needs to be addressed so that they can effectively compete against Portland cement. This chapter thus reviews AACB costs, carbon dioxide emissions, and some durability issues like efflorescences, alkali silica reaction, and corrosion of steel reinforcement., (undefined)

Published
2017

13. Experimental investigation on the composition, mechanical strength and self-cleaning ability of photocatalytic mortars

Author

Azevedo, N., Miraldo, S., Abdollahnejad, Zahra, Pacheco-Torgal, F., Aguiar, J. L. Barroso de, and Universidade do Minho

Subjects
Argamassas fotocatalíticas, Capacidade de auto-limpeza, Photocatalytic mortars, Portland cement, Aerial lime, Cal aérea, Cimento Portland, Self-cleaning ability
Abstract

The self-cleaning ability of photocatalytic cement-based materials has the potential to preserve the esthetic appearance of building facades over time thus reducing cleaning costs. In the present work , the joint effect of several factors on the mechanical strength and self-cleaning ability of photocatalytic mortars was studied. For this purpose, four different mortar mixes containing two binder/sand ratios (1:3 and 1:4) were analyzed. Two mixes containing only Portland cement and the other two possessing 50% Portland cement and 50% aerial lime. For each mix, four different compositions were manufactured, each one with a different titanium dioxide-TiO2 content (0%, 2%, 4% and 6%). The results show that w/b increases with TiO2 which, in turn, leads to lower mechanical strength. Results also show that the mixes with 2% TiO2 had the highest self-cleaning effect., A capacidade de auto-limpeza de materiais cimentícios fotocatalíticos apresenta potencial para preservar a aparência estética das fachadas de edificios ao longo do tempo reduzindo dessa forma os custos de limpeza das mesmas. No presente trabalho estudou-se o efeito conjunto de vários factores na resistência mecãnica e na capacidade de auto-limpeza de argamassas fotocatalíticas. Para este objectivo analisaram-se quatro argamassas contendo dois rácios ligante/areia (1:3 e 1:4). Duas composições continham sómente cimento Portland e outras duas continham 50% de cimento Portland e 50% de cal aérea. Para cada uma destas composições produziram-se quatro misturas com uma percentagem variável de dióxido de titânio - TiO2 (0%, 2%, 4% e 6%). Os resultados mostram que o aumento da percentagem de TiO2 implica um aumento da razão água/ligante que se traduz em menor resistência mecânica. Os resultados mostram também que as argamassas com 2% de TiO2 apresentaram a maior capacidade de auto-limpeza., info:eu-repo/semantics/publishedVersion

Published
2015

18. Cost-efficient one-part alkali-activated mortars with low global warming potential for floor heating systems applications.

Author

Abdollahnejad, Z., Miraldo, S., Pacheco-Torgal, F., and Aguiar, J. Barroso

Subjects
*MORTAR, *GLOBAL warming, *FLOOR heating systems, *THERMAL insulation, *HEAT losses, *COST analysis
Abstract

Increasing building energy efficiency is one the most cost-effective ways to reduce emissions. The use of thermal insulation materials mitigates heat loss in buildings, therefore minimising heat energy needs. In recent years, several papers were published on the subject of foam alkali-activated cements with enhanced thermal conductivity. However, on those papers cost analysis was strangely avoided. This paper presents experimental results on one-part alkali-activated cements. It also includes global warming potential assessment and cost analysis. Foam one-part alkali-activated cements cost simulations considering two carbon dioxide social costs scenarios are also included. The results show that one-part alkali-activated cements mixtures based on 26%OPC + 58.3%FA + 8%CS + 7.7%CH and 3.5% hydrogen peroxide constitute a promising cost-efficient (67 euro/m3), thermal insulation solution for floor heating systems. This mixture presents a low global warming potential of 443 KgCO2eq/m3. The results confirm that in both carbon dioxide social cost scenarios the mixture 26 OPC + 58.3 FA + 8 CS + 7.7 CH with 3.5% hydrogen peroxide foaming agent is still the most cost efficient. [ABSTRACT FROM AUTHOR]

Published
2017
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19. Contributor contact details

Author

Pacheco-Torgal, F., Diamanti, Maria Vittoria, Nazari, A., Granqvist, Claes G., Constantinides, Georgios, Miraldo, S., Ding, Y., Labrincha, J.A., Chen, Zhipei, Ding, Yining, Zhang, Yulin, Shi, Xianming, Xiao, Zhenjian, Wu, Jianlin, Jahromi, Saeed Ghaffarpour, Spitzmiller, Melissa, Mahendra, Shaily, Damoiseaux, Robert, Baetens, Ruben, Buratti, Cinzia, Moretti, Elisa, Lamont, Lisa Ann, Pedeferri, MariaPia, Synnott, Damian, Nolan, Nicholas, Ryan, Darragh, Colreavy, John, Pillai, Suresh C., del Cacho, Carmen, Geiss, Otmar, Leva, Paolo, Tirendi, Salvatore, Barrero-Moreno, Josefa, Kar, Soumitra, and Tewari, P.K.

Published
2013
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20. Design of Fly Ash-Based Alkali-Activated Mortars, Containing Waste Glass and Recycled CDW Aggregates, for Compressive Strength Optimization.

Author

Miraldo S, Lopes S, Lopes AV, and Pacheco-Torgal F

Abstract

Alkali-activated mortars and concretes have been gaining increased attention due to their potential for providing a more sustainable alternative to traditional ordinary Portland cement mixtures. In addition, the inclusion of high volumes of recycled materials in these traditional mortars and concretes has been shown to be particularly challenging. The compositions of the mixtures present in this paper were designed to make use of a hybrid alkali-activation model, as they were mostly composed of class F fly ash and calcium-rich precursors, namely, ordinary Portland cement and calcium hydroxide. Moreover, the viability of the addition of fine milled glass wastes and fine limestone powder, as a source of soluble silicates and as a filler, respectively, was also investigated. The optimization criterium for the design of fly ash-based alkali-activated mortar compositions was the maximization of both the compressive strength and environmental performance of the mortars. With this objective, two stages of optimization were conceived: one in which the inclusion of secondary precursors in ambient-cured mortar samples was implemented and, simultaneously, in which the compositions were tested for the determination of short-term compressive strength and another phase containing a deeper study on the effects of the addition of glass wastes on the compressive strength of mortar samples cured for 24 h at 80 °C and tested up to 28 days of curing. Furthermore, in both stages, the effects (on the compressive strength) of the inclusion of construction and demolition recycled aggregates were also investigated. The results show that a heat-cured fly ash-based mortar containing a 1% glass powder content (in relation to the binder weight) and a 10% replacement of natural aggregate for CDRA may display as much as a 28-day compressive strength of 31.4 MPa.

Published
2022
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