Thermoactivated Recycled Cement

Bogas, José Alexandre; Carriço, Ana; Real, Sofia

doi:10.5772/intechopen.98488

Cited by 2 publications

(3 citation statements)

References 62 publications

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“…236−239 These parameters have been extensively explored experimentally, and we refer readers to a different review paper for more detail. 240 However, similarly to above, computational methods appear strikingly lacking when they could be playing an enormous role in understanding these complex mixtures and parsing out features or parameters that contribute to optimal formulations for recycled cement. Optimization criterion can include mechanical strength and durability as well as, for example, designing concretes with the same chemical composition as cement raw materials to close the concrete−cement−concrete life cycle for completely recyclable concretes.…”

Section: Chemicalmentioning

confidence: 99%

“…Hydrated cement waste (HCW) extracted from fine aggregates of construction and demolition waste, upon thermal treatment, can exhibit cementitious behavior with potential to at least partially replace virgin cements. HCW materials are complex, with poorly understood reaction kinetics, and their properties are affected by many parameters including source, thermal treatment parameters, and carbonation. − These parameters have been extensively explored experimentally, and we refer readers to a different review paper for more detail . However, similarly to above, computational methods appear strikingly lacking when they could be playing an enormous role in understanding these complex mixtures and parsing out features or parameters that contribute to optimal formulations for recycled cement.…”

Section: Applicationsmentioning

confidence: 99%

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Computational Design and Manufacturing of Sustainable Materials through First-Principles and Materiomics

et al. 2023

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Engineered materials are ubiquitous throughout society and are critical to the development of modern technology, yet many current material systems are inexorably tied to widespread deterioration of ecological processes. Next-generation material systems can address goals of environmental sustainability by providing alternatives to fossil fuel-based materials and by reducing destructive extraction processes, energy costs, and accumulation of solid waste. However, development of sustainable materials faces several key challenges including investigation, processing, and architecting of new feedstocks that are often relatively mechanically weak, complex, and difficult to characterize or standardize. In this review paper, we outline a framework for examining sustainability in material systems and discuss how recent developments in modeling, machine learning, and other computational tools can aid the discovery of novel sustainable materials. We consider these through the lens of materiomics, an approach that considers material systems holistically by incorporating perspectives of all relevant scales, beginning with first-principles approaches and extending through the macroscale to consider sustainable material design from the bottom-up. We follow with an examination of how computational methods are currently applied to select examples of sustainable material development, with particular emphasis on bioinspired and biobased materials, and conclude with perspectives on opportunities and open challenges.

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Section: Chemicalmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Computational Design and Manufacturing of Sustainable Materials through First-Principles and Materiomics

et al. 2023

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“…Three prominent peaks are identified. Several authors [26,[48][49][50] have indicated the ranges for these peaks and explained their causes. The first peak at 160 °C is due to water loss, mainly from the dehydration of the C-S-H gels and ettringite decomposition.…”

Section: Identification Of Phase Transitionsmentioning

confidence: 99%

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

et al. 2023

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Cement is the strength-forming component of concrete. It has been a major building material for more than a century. However, its production is accountable for a considerable percentage of global CO2 emissions and is very energy-intensive. The Ordinary Portland Cement (OPC) production is a thermal process at around 1450 °C. This study shows that the reactivation of Hydrated Cement Powder (HCP) can be successful at a much lower temperature. Therefore, the possibility of using HCP to replace parts of OPC in concrete reduces the energy consumption and the CO2 emissions associated with OPC production. HCP, which may ultimately stem from recycled concrete, needs treatment to produce new concrete of the required mechanical strength. Using reactivated HCP in concrete, an optimum strength is achieved by heating the HCP in the range of 400–800 °C. Among other factors, the type of cement used influences the optimum heating temperature and attainable strength. This paper shows that 600 °C is an optimum heating temperature using the OPC type CEM I 52.5R. The crystalline phase transitions resulting from the thermal treatment were analyzed by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetry (TG). The heat released during hydration was investigated, and scanning electron microscopy (SEM) displays the microstructure evolution. OPC can be partially replaced by thermally treated HCP in mortar, attaining similar mechanical strength values.

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Thermoactivated Recycled Cement

Cited by 2 publications

References 62 publications

Computational Design and Manufacturing of Sustainable Materials through First-Principles and Materiomics

Computational Design and Manufacturing of Sustainable Materials through First-Principles and Materiomics

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

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