Long-term analysis of the physical properties of the mixed recycled aggregate and their effect on the properties of mortars

Ferreira, Ruan L.S.; Anjos, Marcos Alyssandro Soares dos; Maia, Cinthia; Pinto, Licarion; Azevedo, Afonso Rangel Garcez de; Brito, Jorge de

doi:10.1016/j.conbuildmat.2020.121796

Cited by 27 publications

(21 citation statements)

References 45 publications

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“…Another study evaluated the use of mixed recycled aggregates in mortars, evaluating the effect of temporal variability in the collection of materials and their influence on the final properties of mortars, using statistical models for this. The results of this research showed that adequate and standardized processing, in addition to defining mixtures in an optimized way, considerably reduced the effect of the heterogeneity of recycled aggregates on the technological properties of mortars [13,19].…”

Section: Introductionmentioning

confidence: 89%

“…Another way of presenting the construction and demolition waste generation data indicates the quantity of CDW weighted by construction value (per annum), which is a more realistic form of data of the local reality and of better comparative analysis, and also the quantity of CDW per added value construction industry, as can be seen in Table 1 below. Construction and demolition waste is one of the main sources for the production of recycled aggregates worldwide, due to its high availability and compatibility [13,14]. As South East Asia has several countries, in different economic conditions, it is difficult to accurately measure data related to the production of CDW; Malaysia, Singapore, and Vietnam are the only countries that publish data on a regular basis [6].…”

Section: Introductionmentioning

confidence: 99%

“…The use of recycled aggregates in concrete brings a series of technological and environmental benefits; however, one of the biggest criticisms about their use on a large scale refers to the great heterogeneity of their composition, especially those from CDW, as they contain not only concrete, but also other building materials, such as brick, wood, plaster, etc. [13].…”

Section: Introductionmentioning

confidence: 99%

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Capacity to Develop Recycled Aggregate Concrete in South East Asia

et al. 2021

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The global sustainable construction aimed to minimize the ecological impacts of constructed facilities’ lifetime. In construction, concretes are the major materials utilized in South East Asia. Thus, it makes environmental and economic sense to utilize recycled materials in the production of new concretes for diverse uses. This review indicated that the practical implementations of the recycled aggregate concretes (RAC) in the area is greatly lacking, even though there are reasonable studies on RAC, particularly because of lack awareness and economic viability of such uses at the present period. This research aims to establish an interdisciplinary consortium with researchers, policy makers, practitioners, and social scientists in Southeast Asia to investigate the development of sustainable, durable, cost-effective, green concrete by utilizing recycled aggregates. Concentrating on waste resource recovery, this research presents an integrated modeling method. The approaches track and forecast a variety of values across technical, economic, social, and environmental areas linking these to the material flow and therefore integrating and building upon one-dimensional models like life cycle assessments (LCAs) and material flow analyses (MFAs). Additionally, the analysis of this study supported the recycling of cement for general use in construction, emphasizing the feasibility, reliability, and longevity of a project at the same time. However, the analysis also demonstrated that although there is fair progress on recycled concrete, there is still a severe lack of appropriate development in particular because of the lack of economic sustainability and knowledge of such applications at present. Raw material conservations were recorded; carbon dioxide costs and footprint were also reduced. Considering the RAC economic, technical, and environmental parameters, frameworks were applied for sustainable selections with target compressive strengths as the major goal.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Capacity to Develop Recycled Aggregate Concrete in South East Asia

et al. 2021

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“…In any case, the quality of the initial CDW for the production of RAs is fundamental and it is possible through a selective demolition. It would allow to obtain higher quality aggregates that enhance the concrete quality which can be hardly reached with MRAs [ 84 ].…”

Section: Future Perspectivementioning

confidence: 99%

Impact of Recycled Aggregate on the Mechanical and Environmental Properties of Concrete: A Review

et al. 2022

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This review aims to present and discuss the mechanical and environmental properties of two different type of recycled aggregates obtain from construction and demolition waste (CDW): (1) Recycled Concrete Aggregates (RCA) and (2) Mixed Recycled Aggregates (MRA). In addition, the properties of the concrete in the fresh (workability, water/cement ratio) and hardened state (mechanical and durability properties), as well as the environmental impact of the concrete produced with the two types of recycled aggregates, are presented and discussed. Due to the heterogeneous composition of recycled aggregates, the concrete properties can be significantly variable. The systematic review concerns scientific papers published from 2010 to 2020 and it shows the importance of the selection process in order to obtain high quality CDW as well as of the type of recycled aggregates on concrete properties. In particular, recycled concrete aggregates show a better quality and homogeneity than mixed recycled aggregates that make them more suitable for concrete. This work presents an overview on the influence of recycled aggregate quality on the physical, mechanical and environmental properties of concrete.

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“…The substitution of these natural materials in structural concrete by alternatives, such as RCA, is interesting from the environmental perspective and in terms of reducing the demand for natural raw materials. Another point that can be associated is the issue of the disposal of concrete waste, which is taken to landfills, which demand high costs [23,44,45]. The production of RCA is still very little explored on an industrial scale, as there are still gaps related to the standardization of its production process and the need to adapt these industries, such as in acquisition of specific machines for this purpose [46,47].…”

Section: Vision Mission and Guiding Principles Of Recycled Concrete A...mentioning

confidence: 99%

Design Strategy for Recycled Aggregate Concrete: A Review of Status and Future Perspectives

et al. 2021

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Currently, a number of disadvantages hampers the use of recycled concrete aggregates (RCA). The current review proves that concretes made with complete replacement of natural aggregate with RCA allow the production of high-quality concrete. One of the possibilities for improving concrete properties with RCA is the use of extended curing and pozzolanic materials with varying cement ratios. The potential use of RCA concretes is in the production of high-value materials that increase environmental and financial benefits. RCA have strong potential in the development of a new generation of concrete and stimulate economic activity in many countries in addition to optimizing natural resources. Economic benefits include minimal travel costs; cheaper sources of concrete than newly mined aggregates; reduction of the landfill area required for the placement of concrete waste; the use of RCA minimizes the need for gravel extraction, etc. The proposed strategy could be to sequentially separate demolition waste such as roof finishes, waterproof materials, interior and exterior materials, etc. Closing life cycles is the main approach used for efficient structures for the recycling and reuse of construction and demolition waste in the production and recovery of materials, especially when recycling and reusing materials. In the life cycle, the recycling of recovered materials allows them to be used for new construction purposes, avoiding the use of natural concrete aggregates. Government, design institutes, construction departments and project managers should be involved in the creation and use of RCA. In demolition and construction, the main players are the project owners. Their obligations, expectations and responsibilities must be properly aligned. For the past 20 years, recycled concrete aggregate from demolition and construction waste has been considered as an alternative to pure concrete in structural concrete to minimize the environmental impact of construction waste and demolition waste and the conversion of natural aggregate resources. It is now recognized that the use of RCA for the generations of concrete is a promising and very attractive technology for reducing the environmental impact of the construction sector and conserving natural resources. In the market, the selling price is not an obstacle for market applications of RCA, as there are scenarios in which their cost is lower than the cost of products made from conventional building materials. This is more of an acceptance factor in the market for recycled concrete aggregates. In this sector, the lack of identification, accreditation and uniform quality certification systems and their narrow application cause some marketing problems. With proper RCA preparation, concrete with standard physical and mechanical properties and performance characteristics can be obtained.

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Long-term analysis of the physical properties of the mixed recycled aggregate and their effect on the properties of mortars

Cited by 27 publications

References 45 publications

Capacity to Develop Recycled Aggregate Concrete in South East Asia

Capacity to Develop Recycled Aggregate Concrete in South East Asia

Impact of Recycled Aggregate on the Mechanical and Environmental Properties of Concrete: A Review

Design Strategy for Recycled Aggregate Concrete: A Review of Status and Future Perspectives

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