Feasibility of Using Unbound Mixed Recycled Aggregates from CDW over Expansive Clay Subgrade in Unpaved Rural Roads
Construction Engineering, University of Córdoba, Ed. Leonardo Da Vinci, Campus of Rabanales, Córdoba 14071, Spain
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Academic Editor: Jorge de Brito
Materials 2016, 9(11), 931; https://doi.org/10.3390/ma9110931
Received: 16 September 2016
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Revised: 8 November 2016
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Accepted: 10 November 2016
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Published: 17 November 2016
Social awareness aims to increase practical skills, such as sustainable development, which seeks to increase the use of different types of waste in construction activities. Although insufficient attention is sometimes given to these actions, it is essential to spread information regarding new studies in the field of waste recycling, which encourages and promotes waste use. Reusing and recycling construction waste in the creation of buildings and infrastructure are fundamental strategies to achieving sustainability in the construction and engineering sectors. In this context, the concept of waste would no longer exist, as waste would become a material resource. Therefore, this study analyses the behaviours of two unbound mixed recycled aggregates (MRA) in the structural layers of an unpaved rural road with low traffic (category T43). The sections were built on inappropriate soil (A-7-6) with a high degree of free swelling. The experimental road consisted of three sections: the first was made with natural aggregates (NA) that were used as a control, the second was composed of MRA in the subbase and NA in the base, and the third section was completely composed of MRA. The materials were characterised in the laboratory. The behaviours of the structural layers in the experimental road were determined by controlling compaction (“in situ” density and moisture) and measuring the deflections and load capacity (deflectometer) during the 18 months after construction. The results show that the sections made with recycled aggregates meet the technical specifications required by General Technical Specifications for Road and Bridge Works (PG-3). Therefore, the water-soluble sulphate content and Los Angeles abrasion coefficient limits can be increased for recycled aggregates without compromising the quality of this type of road with low traffic. To the best of our knowledge, this is the first study regarding the use of unbound MRA made from construction and demolition waste (CDW) in the construction of an unpaved rural road with low traffic on an expansive clay subgrade.
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Keywords:
construction materials; mixed recycled aggregates; construction and demolition waste; expansive clays; unpaved rural roads.
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MDPI and ACS Style
Del Rey, I.; Ayuso, J.; Galvín, A.P.; Jiménez, J.R.; Barbudo, A. Feasibility of Using Unbound Mixed Recycled Aggregates from CDW over Expansive Clay Subgrade in Unpaved Rural Roads. Materials 2016, 9, 931. https://doi.org/10.3390/ma9110931
AMA Style
Del Rey I, Ayuso J, Galvín AP, Jiménez JR, Barbudo A. Feasibility of Using Unbound Mixed Recycled Aggregates from CDW over Expansive Clay Subgrade in Unpaved Rural Roads. Materials. 2016; 9(11):931. https://doi.org/10.3390/ma9110931
Chicago/Turabian StyleDel Rey, Isaac, Jesús Ayuso, Adela P. Galvín, José R. Jiménez, and Auxi Barbudo. 2016. "Feasibility of Using Unbound Mixed Recycled Aggregates from CDW over Expansive Clay Subgrade in Unpaved Rural Roads" Materials 9, no. 11: 931. https://doi.org/10.3390/ma9110931
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