Affiliation:
1. CIMNE—International Center for Numerical Methods in Engineering, 28010 Madrid, Spain
2. CSIC—Institute of Construction Sciencies “Eduardo Torroja”, 28033 Madrid, Spain
3. Institute of Cement and Its Applications (IECA), 28033 Madrid, Spain
Abstract
Currently, the cement sector has become aware of the economic and environmental advantages of replacing clinker with other supplementary cementitious materials that have a lower carbon footprint in the design of eco-cements. In this study, hydrotalcite, a natural as well as synthetic clay, which can be fabricated at the cement plant site, was used as such an addition. The objective of this work was to evaluate the behavior of its physical–mechanical properties and durability in pastes and mortars, using a magnesium-type commercial hydrotalcite, Mg6Al2(OH)16CO3·4H2O, as a substitute material for 10, 20 and 30% by weight of ordinary Portland cement (OPC). The mechanical strength was not affected by the substitution, the resistance to chlorides increased, as the hydrotalcite (HT) was able to bind chlorides, and the resistance to carbonation increased at 3 months but was almost the same as the reference specimen at 6 months, which indicates the need to have longer test durations.
Funder
Spanish Ministry of Science, Innovation and Universities
Spain’s (Ministry of the Economy) training programme