Assessment of Alkali–Silica Reaction Development in Portland-Limestone Mortar and Concrete with Different Limestone Replacement Ratios and Fineness

In the present context of mitigating greenhouse gas emissions, interground portland-limestone cement (PLC) with elevated limestone filler (LF) replacement ratios (exceeding 15%) presents a feasible sustainable alternative, capable of diminishing clinker content. While LFs are known to modify the microstructure of concrete, the influence on ASR development has yet to be fully understood and requires further investigation. In this context, this work evaluates the effect of LFs replacement ratios between 15% and 25% on ASR development in concrete mixtures incorporating PLC. Analysis of expansion from accelerated mortar bar tests (AMBT) and concrete prism tests (CPT) indicate that increasing LF content from 15% to 25% does not substantially affect ASR-induced expansion. These findings underscore the viability of PLC as a sustainable construction material that does not compromise durability concerning ASR.