Influence of thermally activated industrial concrete fines of different origin on concrete long-term behavior

The use of thermally activated concrete fines as a supplementary cementitious material (SCM) offers a promising approach to construction-waste recycling. However, due to the lower reactivity of activated concrete
fines compared to Portland cement, the substitution affects concrete performance, similar to established SCMs such as fly ash. While the composition of activated concrete fines varies, the effect on concrete
compressive strength is similarly variable. The present study successfully adopts a previously developed model to compensate for compressive strength loss, which allows for the assessment of a wide range of
concrete performance parameters for six different concrete fines. Results show that mechanical performance changes alongside compressive strength. The substitution of Portland cement negatively affects the resistance
to carbonation, which is in-line with established SCMs. Chloride ingress lacks the positive effects of fly ash or slag. While concrete fines may contain harmful substances, elution results indicate parameter dependent effects of thermal activation