Nowadays, in order to reach a more sustainable cement industry, several strategies have been developed. One of them is to increase the use of eco-friendly cements with lower content of clinker, replacing it by additions. Among them, the characterization of the performance of mortars and concretes prepared using cements with ternary binders, which incorporate two additions, are now an important field of study. In this research, the microstructure, durability-related properties and mechanical strength of mortars prepared using three ternary binders with incorporation of ground granulated blast furnace slag, fly ash and limestone have been studied. In these ternary binders, 30% of clinker has been equally replaced by two of those additions. As reference mortars, it has also been prepared specimens with ordinary Portland cement without additions, as well as specimens made with other three binary binders, with only one of the studied additions. The mortars were exposed to an optimum condition (20ºC and 100% relative humidity) until the testing age (28 days). The microstructure has been characterized using mercury intrusion porosimetry and electrical resistivity. Absorption after immersion and compressive strength have also been studied. According to the results obtained, mortars with ternary binders showed an adequate performance.
At present, the reduction of CO2 emissions due to the cement manufacture is an important field of study. In this line, the production of commercial cements consisting of binary binders is relatively common. However, the manufacture of cements made with ternary binders is still very low, at least in Spain. In this work, it has been studied the short-term effects of the exposure to a real in-situ environment in microstructure and properties of different mortars. The in-situ condition consisted of exposing the samples to a Mediterranean climate environment in an inland location sited in Alicante province (Spain). This location would accomplish the specifications of exposure class XC4 defined by Eurocode 2. Reference mortars were prepared with ordinary Portland cement without additions. A binary binder was also studied, incorporating 30% limestone, as well as two ternary binders, with addition 15% limestone and 15% fly ash, and 15% limestone and 15% ground granulated blast furnace slag, respectively. The microstructure has been analyzed using mercury intrusion porosimetry. Absorption after immersion and compressive strength have also been studied. According to the results obtained, mortars with ternary binders showed a good behavior in the short-term compared to reference mortars.
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