The Hydration, Mechanical, Autogenous Shrinkage, Durability, and Sustainability Properties of Cement-Limestone-Slag Ternary Composites

This study examines the hydration-mechanical-autogenous shrinkage-durability-sustainability properties of ternary composites with limestone filler (LF) and ground-granulated blast furnace slag (BFS). Four mixtures were prepared with a water/binder ratio of 0.3 and different replacement ratios varying from 0 to 45%. Multiple experimental studies were performed at various ages. The experimental results are summarized as follows: (1) As the replacement levels increased, compressive strength and autogenous shrinkage (AS) decreased, and this relationship was linear. (2) As the replacement levels increased, cumulative hydration heat decreased. At the age of 3 and 7 days, there was a linear relationship between compressive strength and cumulative hydration heat. (3) Out of all mixtures, the ultrasonic pulse velocity (UPV) and electrical resistivity exhibited a rapid increase in the early stages and tended to slow down in the latter stages. There was a crossover of UPV among various specimens. In the later stages, the electrical resistivity of ternary composite specimens was higher than plain specimens. (4) X-ray diffraction (XRD) results showed that LF and BFS have a synergistic effect. (5) With increasing replacement ratios, the CO2 emissions per unit strength reduced, indicating the sustainability of ternary composites.

Automated summary

This study found that with increasing replacement ratios, the compressive strength and autogenous shrinkage of ternary composites decreased, as did cumulative hydration heat. Additionally, the electrical resistivity of ternary composite specimens was higher than plain specimens, indicating better sustainability.