Page 33 - New Trends in Green Construction

PAVED ROAD SECTION BUILT WITH CONSTRUCTION AND DEMOLITION WASTE MIXED WITH EXCAVATION SOIL
Javier Tavira, José Ramón Jiménez, Jesús Ayuso, Antonio López-Uceda, María José Sierra, Enrique F. Ledesma
Keywords: recycled mixed aggregates, excavation soil, construction and demolition waste, backcalculation, forward calculation, Falling Weight Deflectometer.
1. Introduction
530 million tonnes of Construction Demolition Wastes (CDW) were produced in the European Union (Rodríguez et al, 2015). Spain produced 26 million tonnes in 2012 (Eurostat, 2015). If the excavation soils from construction activities were included, the total waste would be 1350 to 2900 million tonnes (Mudgal et al, 2011).
2. Materials and methods
Two recycled materials were produced in a recycling plant located 5 km North of the Experimental Section (ES), Mixed Recycle Soil (MRS-1) used in granular subbases and Recycled Mixed Aggregates (RMA-1) used in both granular bases and subbases.
There were laboratory studies to characterize the properties of recycling aggregates. The ES tested these materials under real traffic and weather conditions. During its construction, several density, plate load, and falling weight deflectometer tests were performed to determine the bearing capacity of all the layers. A laser profiler determined 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 of the study.
Elastic moduli of each layer studied was calculated using two different methods: back calculation and forward calculation.
Figure 1. Recycling process of CDW
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