Durability of Construction and Demolition Waste-Bearing Ternary Eco-Cements

• Published in: Materials Vol. 15; no. 8; p. 2921
• Main Authors: Moreno-Juez, Jaime, Caneda-Martínez, Laura, Vigil de la Villa, Raquel, Vegas, Iñigo, Frías, Moisés
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 16.04.2022; MDPI
• Subjects: binary pozzolanic blend; Carbon dioxide; Cement; Chloride; Chloride resistance; Concrete; concrete fines; construction and demolition waste; Construction industry; Demolition; Durability; external agents; glass; Laboratories; Legislation; Mortars (material); Particle size; Porosity; Portland cements; Pressurized water; Raw materials; ternary cement mortars; Waste disposal; Water absorption; Madrid Spain; Spain; construction and demolition waste; glass; durability; concrete fines; external agents; binary pozzolanic blend; ternary cement mortars
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15082921

In recent years, the development of ternary cements has become a priority research line for obtaining cements with a lower carbon footprint, with the goal to contribute to achieve climate neutrality by 2050. This study compared ordinary Portland cement (OPC) durability to the performance of ternary cements bearing OPC plus 7% of a 2:1 binary blend of either calcareous (Hc) or siliceous (Hs) concrete waste fines and shatterproof glass. Durability was measured further to the existing legislation for testing concrete water absorption, effective porosity, pressurized water absorption and resistance to chlorides and CO . The experimental findings showed that the 7% blended mortars performed better than the reference cement in terms of total and effective porosity, but they absorbed more pressurized water. They also exhibited lower CO resistance, particularly in the calcareous blend, likely due to its higher porosity. Including the binary blend of CDW enhanced chloride resistance with diffusion coefficients of 2.9 × 10 m s (calcareous fines-glass, 7%Hc-G) and 1.5 × 10 m s (siliceous fines-glass, 7%Hs-G) compared to the reference cement's 4.3 × 10 m s . The siliceous fines-glass blend out-performed the calcareous blend in all the durability tests. As the mortars with and without CDW (construction and demolition waste) performed to similar standards overall, the former were deemed viable for the manufacture of future eco-efficient cements.