A review of full-depth reclamation of pavements with Portland cement: Brazil and abroad

Fedrigo, William; Núñez, Washington Peres; Visser, A T

doi:10.1016/j.conbuildmat.2020.120540

Cited by 22 publications

(17 citation statements)

References 62 publications

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“…Moreover, following the SDGs, an additional improvement was introduced in this academic year. Apart from the standardized design of the pavement structure, some new research about more sustainable materials or construction procedures in pavements was presented, including the reutilization of previous pavements to manufacture some layers in new pavements [48][49][50][51][52][53] or the introduction of waste materials in the production of some materials [54][55][56][57][58][59][60][61][62][63][64]. Hence, students had to choose one of the recently investigated materials or procedures to propose a more sustainable pavement structure.…”

Section: Transport Infrastructurementioning

confidence: 99%

Sustainable Civil Engineering: Incorporating Sustainable Development Goals in Higher Education Curricula

et al. 2021

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In the current climate emergency context, many national and international organizations have adopted measures to integrate sustainability and Sustainable Development Goals (SDGs) in all their fields of action. Within education, steps have been taken to incorporate the perspective of sustainability at all levels. This process has also started at the university since it plays a fundamental role in the strategy for the implementation of specific policies to promote sustainability. However, sometimes it is difficult to include this type of knowledge in the curriculum, due to the lack of flexibility of the university structure or the lack of time to cover the syllabus. In this scenario, civil engineering plays a main role as a fundamental activity in the creation of services and infrastructures with a high environmental impact. The objective of this study is to show a multidisciplinary approach to working on sustainability in a transversal way in the civil engineering degree and to analyze the impact that this type of initiative can have from the learning point of view. The study shows a curricular trajectory supported by problem-based learning and project-based learning designed to promote sustainability in the practice of civil engineering. The good results obtained in the evaluation of the project and the growing incorporation of the SDGs in the final degree projects suggest that this methodology can be implemented by other university degrees.

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Section: Transport Infrastructurementioning

confidence: 99%

Sustainable Civil Engineering: Incorporating Sustainable Development Goals in Higher Education Curricula

et al. 2021

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“…Actually, the most common technology to fabricate asphalt mixtures is the hot process, where the mixing phase (involving the aggregates, bitumen, and filler) occurs at the temperatures of 170-180 • C. With the aim of minimizing the negative impacts on the environment when the asphalt mixtures are produced, new technologies have become established: the warm and cold process [47,48]. These two technologies reduce energy consumption by lowering the temperature at which asphalt mixtures are produced and laid [49].…”

Section: Introductionmentioning

confidence: 99%

A Practice for the Application of Waste in Road Asphalt Pavements in an Eco-Friendly Way

2021

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The integration of circular economy principles in the design of road pavements raises the problem of obtaining high-performance asphalt mixtures for reduction of waste and environmental pollution compared to traditional solutions. In this study, the base and binder layers of road asphalt pavements were prepared by using reclaimed asphalt pavement and construction and demolition waste as coarse aggregates, while jet grouting waste and fly ash served as fillers. A leaching test was performed for the marginal materials, after which the engineering performances of the designed asphalt mixtures were investigated through laboratory tests. A life cycle assessment methodology was applied to determine the life cycle impacts of one cubic meter of each asphalt solution. Next, a multi-criteria decision analysis (MCDA) was performed for the solutions suggested for the binder and base layers. Finally, a sensitivity analysis was conducted to identify the most suitable MCDA solutions by varying the weights for a total of 24 different weight configurations. The results of this work revealed that the solutions utilizing jet grouting waste (in particular, the hot asphalt mixture for the binder layer and cold asphalt mixture for the base layer) were preferred to other traditional and alternative solutions in most decision-making scenarios.

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“…These are different than the fulldepth reclamation technique, which recycles composite pavement materials from surface to base and subbase (and may even include some content from the subgrade). RCA and RAP usually consist of recycled materials from the pavement surface only [23,24]. Furthermore, hot recycling and cold recycling are two commonly used methods for constructing pavement layers using recycled pavement materials.…”

Section: Introduction 1general Backgroundmentioning

confidence: 99%

“…Furthermore, hot recycling and cold recycling are two commonly used methods for constructing pavement layers using recycled pavement materials. The main difference between cold and hot recycling techniques refers to whether the existing bitumen in recycled materials is heated to restore its viscosity prior to compacting [23,24]. Overall, the investigated topics of these studies on recycled pavement materials are categorized into three aspects: (i) characterizing the mechanical properties, such the strength and stiffness that may represent the capacity to bear traffic loading [25,26]; (ii) evaluating their durability to freeze-thaw and wet-dry cycles [27,28]; and (iii) environmental impacts such as the leaching of metals and high alkalinity and pH [29,30].…”

Section: Introduction 1general Backgroundmentioning

confidence: 99%

Seasonal Performance Evaluation of Pavement Base Using Recycled Materials

2021

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Using recycled pavement materials to construct new pavement base is currently an important construction strategy bringing improved sustainability. This study investigates the long-term performance of pavement bases constructed with recycled concrete aggregate (RCA), reclaimed asphalt pavement (RAP), and blends with natural aggregates in a seasonal frost region. The stabilization effect of fly ash on RAP was studied as well. In situ falling weight deflectometer (FWD) tests were routinely conducted to provide seasonal deflection data, which were used to back-calculate the layer modulus. Seasonal changes in the base layer modulus along with the pavement ride quality were monitored. One of the two lanes at the test sections was consistently subjected to traffic loading, whereas the other one was not. Findings from this field research indicated that after undergoing over 8 years of naturally seasonal freeze-thaw conditions, 100% RCA, 50% RCA, plus 50% natural aggregates, and 100% RAP, presented improved performance over 100% natural aggregates. However, 50% RAP blended with 50% natural aggregates performed comparably to natural aggregates only, and fly ash did not provide considerable improvement on the long-term performance of 50% RAP plus 50% natural aggregate base. Seasonal climatic variations turned out to affect pavement performance more critically than traffic loading.

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A review of full-depth reclamation of pavements with Portland cement: Brazil and abroad

Cited by 22 publications

References 62 publications

Sustainable Civil Engineering: Incorporating Sustainable Development Goals in Higher Education Curricula

Sustainable Civil Engineering: Incorporating Sustainable Development Goals in Higher Education Curricula

A Practice for the Application of Waste in Road Asphalt Pavements in an Eco-Friendly Way

Seasonal Performance Evaluation of Pavement Base Using Recycled Materials

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