Mechanical performance of roller compacted concrete with recycled concrete aggregates

2016 ◽  
Vol 19 (1) ◽  
pp. 36-55 ◽  
Author(s):  
Antonio Lopez-Uceda ◽  
Francisco Agrela ◽  
Manuel Cabrera ◽  
Jesús Ayuso ◽  
Martín López
Keyword(s):  
Mechanical Performance ◽  
Recycled Concrete ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Roller Compacted Concrete

scholarly journals Mechanical Performance of Gilsonite Modified Asphalt Mixture Containing Recycled Concrete Aggregate

2021 ◽  
Vol 11 (10) ◽  
pp. 4409
Author(s):  
Daniel Alberto Zuluaga-Astudillo ◽  
Hugo Alexander Rondón-Quintana ◽  
Carlos Alfonso Zafra-Mejía
Keyword(s):  
Mechanical Performance ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Coarse Fraction ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates

Hot-mix asphalts exposed to hot weather and high traffic volumes can display rutting distress. A material that can be used to increase the stiffness of asphalt binders is gilsonite. On the other hand, from an environmental point of view, the virgin natural aggregates of asphalt mixtures can be replaced with recycled concrete aggregates. For these reasons, this study modified the asphalt binder with gilsonite by wet-process to improve rutting resistance, and replaced (by mass and volume) part of the coarse fraction of the aggregate with recycled concrete aggregate in two hot-mix asphalts with different gradations. Unlike other studies, a larger experimental phase was used here. Marshall, indirect tensile strength, resilient modulus, permanent deformation, fatigue resistance, and Cantabro tests were performed. An ANOVA test was carried out. If the replacement of the virgin aggregate by recycled concrete aggregates was made by volume, both materials (gilsonite and recycled concrete aggregate) could be used in hot-mix asphalts for thick-asphalt layers in high temperature climates and any level of traffic. The use of both materials in hot-mix asphalts is not recommended for thin-asphalt layers in low temperatures climates. It is not advisable to replace the aggregates by mass.

Recycled Concrete Mixes for Slip-Form Paving of Roads and Airports

2016 ◽  
Vol 711 ◽  
pp. 730-736
Author(s):  
Maurizio Crispino ◽  
Emanuele Toraldo ◽  
Filippo Giustozzi ◽  
Edoardo Mariani
Keyword(s):  
Mechanical Performance ◽  
Recycled Concrete ◽  
Concrete Slabs ◽  
Cement Concrete ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Plastic Concrete ◽  
Fresh State ◽  
Concrete Mix ◽  
High Production

Slip-form paving is gaining consensus in road and airport construction due to high production rates and automation of the process. Concrete slabs are extruded by pulling the forms continuously through and surrounding the plastic concrete mass. The technology uses low-slump cement concrete mixes so that the fresh mass is able to hold its shape once the slip-form paver has passed; besides low-slump, several other parameters should be considered for a proper slip-form concrete mix, especially at the fresh state. To date, recycling is being commonly adopted in concrete mixes to address sustainability in construction of transport infrastructures. Recycled Concrete Aggregates (RCA) are used to reduce the consumption of virgin materials although their increased porosity leads to higher absorption and generally lower mechanical performance. The present study aimed at evaluating the compatibility of 100% recycled concrete mixes with slip-form paving; recycled concrete was tested to evaluate the fresh-state properties as well as the hardened strength. Results showed that slip-form effective and high-resistance mixes could be prepared by using high content of RCA.

scholarly journals Mechanical Performance of Eco-Friendly Concretes with Volcanic Powder and Recycled Concrete Aggregates

2018 ◽  
Vol 10 (9) ◽  
pp. 3036 ◽  
Author(s):  
Viviana Letelier ◽  
José Ortega ◽  
Ester Tarela ◽  
Pedro Muñoz ◽  
Bastián Henríquez-Jara ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Construction Industry ◽  
Mechanical Performance ◽  
Significant Loss ◽  
Recycled Concrete ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Mixing Ratios ◽  
Coarse Aggregates ◽  
Major Subject

At present, reducing the environmental impact of the construction industry is a major subject of study. In terms of the use of recycled concrete aggregates (RCA), most recently conducted studies have shown that the use of a limited percentage of those aggregates does not significantly affect the properties of concretes. This work analysed the mechanical properties of medium-strength concretes with a high contribution to sustainability, where cement and natural coarse aggregates (NCA) were partially replaced by volcanic powder (VP) and RCA, respectively. Three mixing ratios of VP replacement were tested in concretes without RCA and concretes with 30% RCA replacing NCA. Results show that when VP is used without RCA, up to 10% of the cement can be replaced by VP without a significant loss in the mechanical properties. When a combination of 5% VP and 30% RCA is used, the weakness of the recycled concrete is strengthened, obtaining stronger concretes than a control concrete with no recycled materials. Finally, the greenhouse gas assessment showed that the simultaneous incorporation of VP and RCA reduces CO2 emissions produced in the manufacture of concrete by up to 13.6%.

Use of Coarse Recycled Concrete Aggregate in Ternary Blended Portland Cement Concrete

2020 ◽  
Vol 2674 (10) ◽  
pp. 705-714
Author(s):  
Seth Wagner ◽  
Gabrielle Wickizer ◽  
Douglas Cleary ◽  
Gilson R. Lomboy ◽  
Danielle Kennedy ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Blast Furnace Slag ◽  
Mechanical Performance ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Concrete Aggregate ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Furnace Slag

The purposes of this study were to (a) investigate concrete pavement mixtures with recycled concrete aggregates using ternary blended cementitious binders, (b) measure the fresh and hardened properties of the concrete mixtures, and (c) assess the durability of concrete implementing the use of recycled coarse aggregates with ternary binders. Mixtures had recycled concrete aggregates at varying replacement rates. The binders were combinations of Portland cement, Class C and F fly ashes, and ground granulated blast furnace slag. At 50% replacement of virgin aggregates, some specimens showed comparable mechanical performance to the control mix. Performance is heavily tied to quality of recycled aggregates. The combined use of fly ash and blast furnace slag showed improvements in results for drying shrinkage, freeze–thaw durability, resistivity, and alkali–silica reaction mitigation.

Green Concrete made with Recycled Concrete Aggregates: Fresh and Hardened Properties

2018 ◽  
Author(s):  
Driton R. Kryeziu ◽  
Armend Muja ◽  
Fisnik Kadiu ◽  
Visar Krelani ◽  
Besian Sinani ◽  
...  
Keyword(s):  
Recycled Concrete ◽  
Green Concrete ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Hardened Properties

scholarly journals Characterisation and Life Cycle Assessment of Pervious Concrete with Recycled Concrete Aggregates

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 209
Author(s):  
Adilson C. Paula Junior ◽  
Cláudia Jacinto ◽  
Thaís M. Oliveira ◽  
Antonio E. Polisseni ◽  
Fabio M. Brum ◽  
...  
Keyword(s):  
Environmental Performance ◽  
Treatment Plant ◽  
Recycled Concrete ◽  
Pervious Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Positive Contribution ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates

The search for environmental preservation and conservation of natural resources gives rise to new concepts and viable technical solutions on the path to sustainable development. In this context, this study’s main objective is to analyse the influence of recycled concrete aggregates (RCAs) on the development of pervious concrete, whose use as a floor covering represents an excellent device to mitigate the urban soil sealing phenomena. For this, mechanical and hydraulic tests were carried out, in addition to microstructural analyses and the assessment of its environmental performance. The results obtained were compared to reference studies also involving the incorporation of recycled aggregates. A pilot-scale case study was conducted, involving a parking space lined with pervious concrete moulded “in situ”. In laboratory tests, permeability coefficients and mechanical strengths compatible with the literature and above the normative limit for light traffic were found. The case study demonstrated higher permeability than in the laboratory, but the flexural strength was lower, being indicated only for pedestrian traffic. The environmental assessment showed that the RCA represents a positive contribution to the environmental performance of pervious concrete. Still, attention should be given to the recycled aggregate transport distance between the concrete plant and the RCA treatment plant.

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