Formulation of Alkali-Activated Slag Binder Destined for Use in Developing Countries

Applied Sciences

Nabil Bella¹  MaríaVictoria Borrachero²  Lourdes Soriano²  Jordi Paya²  Alba Font²  JoséMaria Monzó²  Edwin Gudiel³ 

[1] FIMAS Laboratory, Tahri Mohamed University of Bechar, Bechar 08000, Algeria;Grupo de Investigación en Química de los Materiales (GIQUIMA), Instituto de Ciencia y Tecnología del Hormigón (ICITECH), Universitat Politècnica de València (UPV), 46022 València, Spain;Universidad Andina del Cusco, Cusco 08006, Peru;

关键词: alkali-activated material;    blast furnace slag;    activators;    mechanical properties;    microstructure;    developing countries;   

DOI  :  10.3390/app10249088

来源: DOAJ

【 摘 要 】

Worldwide cement production is around 4.2 billion tons, and the fabrication of one ton of ordinary Portland cement emits around 900 kg of CO₂. Blast furnace slag (BFS) is a byproduct used to produce alkali-activated materials (AAM). BFS production was estimated at about 350 million tons in 2018, and the BFS reuse rate in construction materials of developing countries is low. AAM can reduce CO₂ emissions in relation to Portland cement materials: Its use in construction would be a golden opportunity for developing countries in forthcoming decades. The present research aims to formulate AAM destined for future applications in developing countries. Two activators were used: NaOH, Na₂CO₃, and a mixture of both. The results showed that compressive strengths within the 42–56 MPa range after 28 curing days were obtained for the Na₂CO₃-activated mortars. The characterization analysis confirmed the presence of hydrotalcite, carbonated phases, CSH and CASH. The economic study showed that Na₂CO₃ was the cheapest activator in terms of the relative cost per ton and MPa of manufactured mortars. Finally, the environmental benefits of mortars based on this reagent were evidenced, and, in terms of kgCO₂ emissions per ton and MPa, the mortars with Na₂CO₃ yielded 50% lower values than with NaOH.

【 授权许可】

Unknown