Rehabilitation of Public Spaces with Construction Excavation Waste (E-CDW): A Case Study of Costanera San Miguel-Lima-Peru

Lima is the most important city in Peru, as it is home to about a third of the country’s total population (around 10 million people), and concentrates more than half of the national GDP. Considering various sources, Lima concentrates 60% of the activity in the construction and real estate sector, with buildings averaging 10.5 floors in height, which can extend in certain districts up to 20 floors. A multi-stage methodology was developed, comprising three stages. In the first stage, based on the data collected by the Association of Ecological Studies and Sustainable Civil Research (ADEICs) institution, the excavation construction and demolition waste (E-CDW) generation trends were modelled and the annual E-CDW generation rate was predicted using ARIMA models, Holt-Winters and Neural Networks. In the second stage, life cycle assessment (LCA) was used to estimate the environmental impacts related to ten impact categories, including global warming. Finally, using the hedonic price model, the economic value of the E-CDW waste was estimated. The reuse of excavation material is an alternative for the recovery of public spaces. It is the case of the waterfront of the district of San Miguel, where a total of more than five million m³ of waste have been reused since 2017 to 2023. This waste has been collected from more than 1400 construction sites, comprising 30% of the total works in the city. This waste is composed of approximately 90% rocky material and 8% fine material, and its reuse has made it possible to generate 30 hectares of new land and recover 60 hectares of public space. The experience demonstrated the positive impact associated with the reuse of excavation material in the recovery of public areas in the city of Lima, with an economic value of 1089 million dollars of the urban land recovered and generated.