Abstract
Ternary Portland cements are new cementitious materials that contain different amounts of cement replacements. Ternary Portland cements composed of granulated blast-furnace slag (GBFS), coal fly ash (CFA), and clinker (K) can afford some environmental advantages by lowering the Portland cement clinker use. Accordingly, this is an opportunity to reduce carbon dioxide emissions and achieve net-zero carbon emissions by 2050. Furthermore, GBFS and CFA possess pozzolanic properties and enhance the mechanical strength and durability at later ages. Compressive strength and natural carbonation tests were performed in mortar and concrete. Cement-based materials made with GBFS and/or CFA presented a delay in the compressive strength development. In addition, they exhibited lower carbonation resistance than that of mortar and concrete made with plain Portland cements. Concrete reinforcement remains passive in common conditions; however, it could be corroded if the concrete pore solution pH drops due to the carbonation process. Service life estimation was performed for the ternary cements regarding the carbonation process. This information can be useful to material and civil engineers in designing concretes made with these ternary cements.
Highlights
Cement-based materials made with granulated blast-furnace slag (GBFS) and/or coal fly ash (CFA) presented a delay in the compressive strength development
Concrete reinforcement remains passive in common conditions; it could be corroded if the concrete pore solution pH drops due to the carbonation process
Ternary cements are binders composed of Portland cement clinker and two other components, which are usually blended at the cement mill
Summary
Ternary cements are binders composed of Portland cement clinker and two other components, which are usually blended at the cement mill. Ground granulated blastfurnace slag and siliceous coal fly ash are two major constituents in Portland cements due to their good durable properties in aggressive environments By contrast, these cements carbonate faster than plain Portland cement [1]. These cements carbonate faster than plain Portland cement [1] This constitutes a major drawback: it means that the expected service life of concretes made with cements containing ground granulated blast-furnace slag and/or siliceous coal fly ash would be lower. This aspect should be considered in the decision of using these new cements. They are sensitive to wet-curing time with regard to the natural carbonation resistance [1]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
