Effect of pore size distribution on the qualities of recycled aggregate concrete

Moon, Dae Joong; Moon, Han-Young

doi:10.1007/bf02829151

Cited by 15 publications

(4 citation statements)

References 2 publications

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“…The AP increased as the percentage of RA increased, especially with the incorporation of FRA. This physical property is crucial, since it is related to the water absorption of the cylindrical specimens (Bermejo et al 2010 ; Gómez-Soberón 2002 ; Kumar and Bhattacharjee 2003 ; Moon and Moon 2002 ). Therefore, this property follows the same trend that water absorption (Fig.…”

Section: Resultsmentioning

confidence: 99%

Construction and demolition waste as recycled aggregate for environmentally friendly concrete paving

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Pérez

Gázquez

et al. 2021

Environ Sci Pollut Res

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Recycled aggregates (RA) from construction and demolition waste (CDW) instead of natural aggregates (NA) were analysed in the manufacture of new eco-friendly concrete. Fine (FRA) and coarse (CRA) recycled aggregates were used in different percentages as substitutes of natural sand and gravel, respectively. The results revealed that the use of RA in percentages of up to 50 wt.% is feasible. Additionally, RA were used to produce paving blocks in accordance with industrial requirements. Thus, values of water absorption lesser than 6.0% and tensile strength upper than 3.6 MPa were obtained, which are similar to those of a reference sample and within the limit values established by the regulations. These results were achieved by reducing the incorporation of cement, thereby saving production costs and minimizing environmental impact.

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Section: Resultsmentioning

confidence: 99%

Construction and demolition waste as recycled aggregate for environmentally friendly concrete paving

Contreras

Pérez

Gázquez

et al. 2021

Environ Sci Pollut Res

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“…According to Reference [77], who tested the porosity of concrete made with four different recycled concrete aggregates, the volume of pores between 0.05 µm and 2 µm tended to increase with the presence of attached mortar. In view of the results shown in Figure 10, it could be stated that the presence of ceramic fraction positively affected the pore size distribution of recycled concretes, since the growth trend in the pore volume was delayed until the 0.2–0.4 µm pore size mark.…”

Section: Resultsmentioning

confidence: 99%

Paving with Precast Concrete Made with Recycled Mixed Ceramic Aggregates: A Viable Technical Option for the Valorization of Construction and Demolition Wastes (CDW)

et al. 2018

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This research aimed to prove the feasibility of producing two types of precast elements widely used in construction, such as curbstones and paving blocks, using recycled concrete made with a 50% substitution of the natural gravel by recycled mixed aggregates with a significant ceramic content (>30%). In order to prove the quality of such mass concrete recycled precast elements, two different mixes were used: the first one was a conventional concrete mix provided by Prefabricados de Hormigón Pavimentos Páramo S.L., one of the collaborating companies in this study, and the other was a mixture in which wt 50% of the natural coarse aggregates were substituted for recycled mixed aggregates ceramic (RMAc). This recycled aggregate is a heterogeneous mixture of unbound aggregates, concrete, ceramic, etc., used as a secondary recycled aggregate and commonly produced in a lot of recycling plants in many European countries. This material was supplied by Tecnología y Reciclado S.L., the other collaborating company. Both mixtures were representative in order to establish the comparative behavior between them, taking into account that smaller percentages of replacement of the natural with recycled aggregates will also produce good results. This percentage of substitution represents a high saving of natural resources (gravel) and maintains a balanced behavior of the recycled concrete, so this new material can be considered to be a viable and reliable option for precast mass concrete paving elements. The characterization of the recycled precast elements, covering mechanical, microstructural, and durability properties, showed mostly similar behavior when compared to the analogous industrially-produced pieces made with conventional concrete.

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“…The AP decreased as the percentage of RA increased, especially with the incorporation of FRA. This physical property is crucial, since it is related to the water absorption of the cylindrical specimens (Bermejo et al 2010;Gómez-Soberón 2002;Kumar and Bhattacharjee 2003;Moon and Moon 2002). Therefore, this property follows the same trend that water absorption (Figure 6), because both properties are directly related.…”

Section: Environmentally-friendly Concretes Characterisationmentioning

confidence: 87%

Construction and Demolition Waste As Recycled Aggregate for Environmentally-Friendly Concrete Paving.

Contreras

Pérez

Gázquez

et al. 2021

Preprint

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Recycled aggregates (RA) from construction and demolition waste (CDW) instead of natural aggregates (NA) was analysed in the manufacture of new eco-friendly concrete. Fine (FRA) and coarse (CRA) recycled aggregates were used in different percentages as substitutes of natural sand and gravel, respectively. The results revealed that the use of RA in percentages of up to 50 wt.% are feasible. Additionally, RA were used to produce paving blocks in accordance with industrial requirements. Thus, values of water absorption lesser than 6% and tensile strength upper than 3.6 MPa were obtained, which are similar to those of a reference sample. These results were achieved by reducing the incorporation of cement, thereby saving production costs and minimizing environmental impact.

show abstract

Effect of pore size distribution on the qualities of recycled aggregate concrete

Cited by 15 publications

References 2 publications

Construction and demolition waste as recycled aggregate for environmentally friendly concrete paving

Construction and demolition waste as recycled aggregate for environmentally friendly concrete paving

Paving with Precast Concrete Made with Recycled Mixed Ceramic Aggregates: A Viable Technical Option for the Valorization of Construction and Demolition Wastes (CDW)

Construction and Demolition Waste As Recycled Aggregate for Environmentally-Friendly Concrete Paving.

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