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Start Over Descriptor "sustainable binder" Publisher elsevier
2 results on '"sustainable binder"'

1. Valorization of waste concrete powder (WCP) through silica fume incorporation to enhance the reactivity and hydration characteristics

Author

Prabhat Vashistha, Yanchen Oinam, and Sukhoon Pyo

Subjects
Waste concrete powder, Silica fume, Heat of hydration, Pozzolanic reactivity, Sustainable binder, Engineering (General). Civil engineering (General), TA1-2040, Building construction, TH1-9745
Abstract

The aim of this study is to utilize the bulk proportion of waste concrete powder (WCP) as cementitious material in the fabrication of binder, and to investigate the impact of silica fume on the reactivity and hydration characteristics of thermomechanical activated WCP. A 29 Silicon Nuclear Magnetic Resonance (NMR) analysis confirmed the presence of reactive silica in the activated WCP. Various blends were prepared with a 50%–80% substitution of type CEM I 52.5 N cement. The combination of activated WCP and silica fume improved the reactivity of the binder blend and achieved a compressive strength comparable to cement. Mineralogical analysis revealed the development of secondary C–S–H gels in mixtures containing silica fumes and activated WCP, which is the result of a secondary hydration reaction between portlandite and reactive silica. The use of life cycle analysis software for the replacement of 60 wt % of cement with activated WCP was found to reduce carbon dioxide emissions by 80.42% due to the use of less cement, an environmentally friendly WCP activation process, even when considering the addition of 10% silica fume. This innovative approach not only enhances WCP reactivity and mechanical strength but also significantly contributes to the reduction of carbon emissions. By elucidating the formation mechanisms and environmental benefits, this study paves the way for a more eco-conscious and efficient construction methodology, promoting the vision of a greener future.

Published
2023
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2. Shear strength assessment of reinforced concrete components containing EAF steel slag aggregates

Author

Vanesa Ortega-López, J.M. Romera, Víctor Revilla-Cuesta, Ignacio Marcos, and Amaia Santamaría

Subjects
Materials science, Sustainable binder, Ensayos (Tecnología), Testing, Building and Construction, Reinforced concrete, Shear strength tests, Mechanics of Materials, Architecture, Self-compacting concrete, Building materials, Shear strength, Electric arc furnace slag, Fiber-reinforced mixes, Materiales de construcción, Composite material, Strut-tie model, Safety, Risk, Reliability and Quality, Civil and Structural Engineering
Abstract

Electric Arc Furnace (EAF) slag can be reused as aggregate in Portland cement concrete mixes. The addition of EAFS and other waste co-products (fly ash, blast furnace slag) will modify the binding properties and will, importantly, enhance the global sustainability of such concretes. These mix designs offer acceptable pumpability and self-compaction in the fresh state and can be reinforced with fibers. In this study, eight different concrete mixes are designed within the range of medium-strength concretes (30–50 MPa) and are characterized in both the fresh and the hardened state. Large concrete volumes are used to pour reinforced beams, which are then subjected to small-span high-load tests to evaluate their resistance to shear stress, by analyzing two types of transversal (shear) reinforcement. The tests yielded promising results, contributing additional evidence on the viability of using recycled EAFS aggregate in structural applications. The mechanical behavior of these concretes was closely correlated with the strength predictions calculated with the formulas listed in various international standards., Spanish Ministry of Universities, MICINN, AEI, EU and ERDF [PID2020-113837RB-I00; RTI2018-097079-B-C31; 10.13039/501100011033; FPU17/03374]; the Junta de Castilla y León and ERDF [UIC-231, BU119P17]; Youth Employment Initiative (JCyL) and ESF [UBU05B_1274]; the University of Burgos [grant number SUCONS, Y135.GI], and, finally, our thanks also go to the SAREN research group (IT1619-22, Basque Government).

Published
2022

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