Multi-criteria optimization of recycled aggregate concrete mixes

Rashid, Khuram; Rehman, Munib Ul; Brito, Jorge de; Ghafoor, Habiba

doi:10.1016/j.jclepro.2020.124316

Cited by 90 publications

(53 citation statements)

References 36 publications

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“…With careful mix design and proper use of chemical admixtures, recycled aggregate can even be used in self-compacting concrete mixes [13]. Concrete density is directly related to the density of its constituents and, as expected, the density of concrete with recycled aggregate is lower compared to that of ordinary concrete [11,14,15,16,19,21]. Replacing 100 % of coarse aggregate with recycled aggregate results in 5 % lower values [14][15][16], and replacing 100 % of fine aggregate results in 4 % lower values [14]; replacing 100 % of the total natural aggregate with recycled aggregate reduces the density by about 10 % [15,16].…”

Section: Influence Of Recycled Aggregate On Concrete Propertiesmentioning

confidence: 79%

“…To gain a better insight into the use of concrete with recycled aggregate, a brief literature review was made, which included analysis of previous laboratory tests of mixes with various percentages of recycled aggregate in the composition, and theoretical studies. The same literature review revealed that it is possible to substitute both fine and coarse aggregates with recycled aggregates in proportions ranging from 0 to 100 % [9][10][11][12][13][14][15][16][17][18][19][20][21]. Variations are possible due to various purity levels of recycled aggregate, and various material properties.…”

Section: Influence Of Recycled Aggregate On Concrete Propertiesmentioning

confidence: 99%

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Construction of a new day hospital in Zadar using recycled aggregate concrete

Baričević¹,

Kovač²,

Didulica³

2021

JCE

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This paper presents the pilot project of application of recycled aggregate during construction of a new day hospital in Zadar. The project included the demolition of an existing hospital building and the use of generated construction waste as recycled aggregate in the construction of a part of the building. The 16/32 mm fraction of aggregate was obtained by mechanical processing of the generated waste which was then tested in accordance with the HRN EN 206 and HRN EN 12620 standards. Four concrete mixes were prepared, and the fresh (slump, density, air content) and hardened properties were tested (compressive strength, modulus of elasticity, capillary absorption, water permeability, drying shrinkage). The obtained results confirm that by complying with the standards for recycled aggregates and knowing their origin it is possible to produce concrete with properties equivalent to those of ordinary concrete for specified durability conditions.

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Section: Influence Of Recycled Aggregate On Concrete Propertiesmentioning

confidence: 79%

Section: Influence Of Recycled Aggregate On Concrete Propertiesmentioning

confidence: 99%

Construction of a new day hospital in Zadar using recycled aggregate concrete

Baričević¹,

Kovač²,

Didulica³

2021

JCE

View full text Add to dashboard Cite

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“…In recent years, the issues of sustainable construction have become an important topic [44]. This research study is helpful in the future manufacturing of a concrete by using recycled aggregate [45], towards expanding the suitable use of materials as a way to maintainable construction practice (Figure 6). Due to the increasing negative effects of climate change, the most utilized material in construction, which is concrete, will be sustainable enough to be eco-friendly.…”

Section: Sustainable Constructions In South East Asiamentioning

confidence: 99%

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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“…In total, 25 mixtures were prepared using RAC at various mass ratios. For the selection of the sustainability of the RAC, a framework based on AHP and TOPSIS, with target compressive strength being the main objective, was used [21].…”

Section: Literature Reviewmentioning

confidence: 99%

Interdisciplinary Evaluation of Intersection Performances—A Microsimulation-Based MCDA

et al. 2021

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Intersections are the most important regions in terms of urban traffic management. The intersection areas on the corridor should be analyzed together for consistency in traffic engineering. To do so, three intersections on the Vatan Street corridor in İstanbul, the most crowded city of Turkey, were examined. Various geometric and signal designs were performed for intersections and the most suitable corridor design was analyzed. The corridor designs were modeled with the PTV VISSIM microsimulation software. The most suitable corridor design was evaluated by using the results obtained from the microsimulation via analytical hierarchy process (AHP) and technique for order preference by similarity to ideal solution (TOPSIS) from multi criteria decision analysis (MCDA) methods. The evaluation criteria in the study are vehicle delay, queue length, stopped delay, stops, travel time, vehicle safety, CO emission, fuel consumption, and construction cost. As a result, the current and the most suitable alternative corridors were compared according to the comparison parameters and up to 80% improvements were observed. Thus, some advantages were obtained in terms of energy, environment, time, and cost.

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Multi-criteria optimization of recycled aggregate concrete mixes

Cited by 90 publications

References 36 publications

Construction of a new day hospital in Zadar using recycled aggregate concrete

Construction of a new day hospital in Zadar using recycled aggregate concrete

Capacity to Develop Recycled Aggregate Concrete in South East Asia

Interdisciplinary Evaluation of Intersection Performances—A Microsimulation-Based MCDA

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