Industrial Low-Clinker Precast Elements Using Recycled Aggregates

• Published in: Applied sciences Vol. 10; no. 19; p. 6655
• Main Authors: Thomas, Carlos, Cimentada, Ana I., Cantero, Blas, Sáez del Bosque, Isabel F., Polanco, Juan A.
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-10-2020
• Subjects: Aggregates; Aggregates (Building materials); Cement; Clinker; Compressive strength; Concrete; Concrete mixing; Demolition; Durability; Environmental aspects; Environmental awareness; low clinker cement; Materials; Mechanical properties; Modulus of elasticity; New Jersey barriers; physical properties; precast; Precast concrete; recycled concrete; Recycling; Reinforced concrete; Tensile strength; Waste disposal; Spain; New Jersey
• ISSN: 2076-3417; 2076-3417
• DOI: 10.3390/app10196655

Increasing amounts of sustainable concretes are being used as society becomes more aware of the environment. This paper attempts to evaluate the properties of precast concrete elements formed with recycled coarse aggregate and low clinker content cement using recycled additions. To this end, six different mix proportions were characterized: a reference concrete; 2 concretes with 25%wt. and 50%wt. substitution of coarse aggregate made using mixed construction and demolition wastes; and others with recycled cement with low clinker content. The compressive strength, the elastic modulus, and the durability indicator decrease with the proportions of recycled aggregate replacing aggregate, and it is accentuated with the incorporation of recycled cement. However, all the precast elements tested show good performance with slight reduction in the mechanical properties. To confirm the appropriate behaviour of New Jersey precast barriers, a test that simulated the impact of a vehicle was carried out.