Title: Known Properties of Concrete to Produce High Quality Recycled Cementitious Material for Buildings

Author(s): Christian Paglia, Michele Paderi, Cristina Mosca, Samuel Antonietti

Publication: Symposium Paper

Volume: 355

Issue:

Appears on pages(s): 447-454

Keywords: sustainability; concrete; recycling; durability; quality; building

DOI: 10.14359/51736052

Date: 7/1/2022

Abstract:
The recycling of waste materials from the construction sector represents an opportunity for environmental protection, to save expensive landfill costs, and promote sustainability. The increased interest in the use of recycled materials is seen in several European countries with the production of concrete using granulates from demolition material. In Switzerland, the SIA 2030 standard defines recycled concrete based on a minimum percentage of 25% recycled aggregates to be added. This research focuses on the possibilities of producing high-quality recycled concrete, starting from high-quality cementitious material, i. e. concrete. The original material with known properties was demolished and used as aggregates to replace the natural aggregates. Fresh, hardened, and durable properties of concrete were evaluated on blends containing 25, 50, and 100% recycled aggregates. At early stage (2 days), the lowest value of compressive strength was already above 15 MPa for the blend with 100% recycled aggregates. Most of the recycled concrete satisfies the main mechanical and durability features, in particular with the addition of 25 respectively 50% of the recycled aggregate component.