Various treatment techniques involved to enhance the recycled coarse aggregate in concrete: A review

Raman, J. Vengadesh Marshall; Ramasamy, V.

doi:10.1016/j.matpr.2020.10.935

Cited by 35 publications

(17 citation statements)

References 59 publications

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“…Others have applied combined coating techniques with additives such as Tite-BE and heating [46], while others have attempted to mechanically eliminate the adhered mortar [70]. States of knowledge regarding the topic of RCA pre-treatment can be consulted in the literature [71,72]. The authors of [72] mention that RCA pre-treatment methods are mainly classified into the following two types: the elimination of adhered mortar and reinforcement of adhered mortar.…”

Section: Recycled Concrete Aggregate Backgroundmentioning

confidence: 99%

“…States of knowledge regarding the topic of RCA pre-treatment can be consulted in the literature [71,72]. The authors of [72] mention that RCA pre-treatment methods are mainly classified into the following two types: the elimination of adhered mortar and reinforcement of adhered mortar. According to the authors of [71], it is much more effective and efficient from an energy standpoint to coat RCAs that to attempt to eliminate the adhered mortar.…”

Section: Recycled Concrete Aggregate Backgroundmentioning

confidence: 99%

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Mechanical Performance of Gilsonite Modified Asphalt Mixture Containing Recycled Concrete Aggregate

2021

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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.

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Section: Recycled Concrete Aggregate Backgroundmentioning

confidence: 99%

Section: Recycled Concrete Aggregate Backgroundmentioning

confidence: 99%

Mechanical Performance of Gilsonite Modified Asphalt Mixture Containing Recycled Concrete Aggregate

2021

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“…However, despite the relevance of recycled aggregates as raw material and the regulatory efforts that reward their use [ 13 ], at present, their applications in the building are quite limited and their use is mainly focused on the elaboration of prefabricated buildings and roads [ 14 , 15 ]. One of the main challenges faced by aggregate recycling plants is the high heterogeneity of the CDW used in their manufacture [ 16 ], which is collected in construction and demolition works and transported to the waste stations to be treated for subsequent separation, crushing, grinding, and removal of impurities by visual inspection [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Three Types of Recycled Aggregates from Different Construction and Demolition Waste: An Experimental Study for Waste Management

Saíz

Morón

Melane-Lavado

et al. 2023

IJERPH

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Achieving sustainable management and efficient use of natural resources stands out as one of the goals included in the Goals for Sustainable Development in the 2030 Agenda. The construction sector is currently far from presenting an efficient model in terms of treating waste generated by it. Variations in the physical and chemical properties of recycled aggregates coming from construction and demolition waste are one of the main reasons of their limited use in the production of construction materials. This research presents a physicochemical characterization of three different types of recycled aggregates coming from different types of waste: concrete, ceramic and mixed. Physical characterization shows that recycled concrete aggregate has better physical properties compared with mixed recycled aggregate and ceramic recycled aggregate, which makes it more suitable for use in masonry mortars and concrete, due to its higher dry density (2210.33 kg/m3), its lower content of fines (5.17%), its lower friability coefficient (24.60%), and its water absorption coefficient (6.70%). Chemical characterization shows that none of the tested recycled aggregates contains traces of harmful chemical agents that exceed the limits established by the reference regulations. Finally, the statistical analysis shows good homogeneity for these raw materials, obtaining low coefficients of variation and values within the recommended in each of the calculated confidence intervals.

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“…In the attempt of overcoming the main drawbacks of RCA, available literature contains various types of methods adopted to improve the performance of RCA by treating the mortar attached. These methods are mainly of two categories, (1) Separation of old mortar and (2) Strengthening of old mortar, out of which strengthening of mortar has proven to be more efficient in achieving desirable properties [26][27][28][29]. Some of these strengthening methods require a lot of equipment and incur high costs in the process.…”

Section: Introductionmentioning

confidence: 99%

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

et al. 2022

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The world today has started facing bigger problems related to the concrete industry, especially with concrete becoming the most extensively used construction material in the world. At a time like this, where more eco-friendly substitutions are stringent, it calls for a more comprehensive approach in producing recycled concrete from recycled concrete aggregates (RCA). This study is an extension to previous studies involving composite utilization of pozzolans in treating RCA. It investigates on the possibility of using rice husk ash (RHA) along with other pozzolans as a cement replacement, in both stages of aggregate treatment and concrete production. It was observed that through this treatment, aggregate specific gravity was increased to a value of 2.37 which was earlier 2.18 for untreated RCA, 26% and 59% reductions were obtained for water absorption and porosity of aggregates, respectively. Further the concrete which contained RHA in both stages, attained a high strength of 55.4 MPa, even surpassing the control mix containing natural aggregates. The same mix resulted a 12% increase in its surface resistivity. Rapid Chloride Permeability Test (RCPT) and water permeability results also showed substantial improvements when compared to the reference RCA mix. Similar to previous studies involving composite use of pozzolans, improvements in the microstructure of both the aggregates and concrete through the use of RHA resulted in the amelioration of both mechanical and durability properties of concrete. This evidently indicates the possibility of achieving high strengths, even with the use of RCA derived from parent concretes of lower grades.

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Various treatment techniques involved to enhance the recycled coarse aggregate in concrete: A review

Cited by 35 publications

References 59 publications

Mechanical Performance of Gilsonite Modified Asphalt Mixture Containing Recycled Concrete Aggregate

Mechanical Performance of Gilsonite Modified Asphalt Mixture Containing Recycled Concrete Aggregate

Characterization of Three Types of Recycled Aggregates from Different Construction and Demolition Waste: An Experimental Study for Waste Management

Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

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