Functional and structural parameters of a paved road section constructed with mixed recycled aggregates from non-selected construction and demolition waste with excavation soil. (10th March 2018)

• Record Type: Journal Article
• Authors: Tavira, Javier; Jiménez, José Ramón; Ayuso, Jesús; Sierra, María José; Ledesma, Enrique Fernández
• Is Part Of: Construction & building materials. Volume 164(2018)
• Page Start: 57
• Page End: 69
• Publication Date: 2018-03-10
• Subjects: CDW construction and demolition waste -- RMAS recycled mixed aggregates with excavation soil -- MRS mixed recycled soil -- FWD falling weight deflectometer -- IRI international roughness index -- NA natural aggregates -- RA recycled aggregates -- RCA recycled concrete aggregates -- CBR California bearing ratio -- ER experimental road -- NDT nondestructive testing -- CS crushed stone -- SS selected soil -- SG subgrade -- GPR ground penetrating radar -- PG3 Spanish general technical specification for road construction; Construction and demolition waste -- Mixed recycled aggregates -- Backcalculation -- Forward calculation -- International roughness index -- Experimental road; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.12.195
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: A road test track was built to evaluate the long-term performance of RA. Comparative study for Moduli calculation of RA and NA layers was carried out. Back and forward calculation was performed using deflections from a HWD. Regularity of the road showed a well evolution after seven years open to traffic. Results showed that RMA and RMAS can replace NA in low traffic roads construction. Abstract: This paper evaluates the lab and in situ mechanical properties of non-selected mixed recycled aggregates from construction and demolition waste (CDW) used as base and subbase unbound materials. Excavation materials are mixed with CDW to produce recycled mixed aggregates with soil, as well as a finer material referred to as mixed recycled soil. The research was divided into two different stages: a laboratory study characterizing the properties of recycling aggregates and a road test track evaluating the long-term performance of these materials under real traffic and weather conditions. During construction, several density, plate load, and falling weight deflectometer tests were performed to determine the bearing capacity of all layers. A laser profiler was also used to obtained the international roughness index. After the road was opened to traffic, a follow up of deflections and surface roughness was performed during the following seven years. Two different moduli calculation methods were used: back calculation and forward calculation. Both methods shown acceptable values for these recycled materials. Low quality recycled mixed aggregates can be used as substitutes for natural aggregates as unbound layers. The mechanical performance and surface roughness values obtained from the experimental road shown an acceptable behaviour.