Durability of concrete made with recycled concrete aggregates after exposure to elevated temperatures

The behaviour of concrete made with recycled concrete aggregates (RCA) at room temperature is well-studied. However, some points still need to be addressed, especially in extreme conditions such as durability and high temperature. This paper evaluates the effect of elevated temperatures on the durability of concrete made with RCA. Three concrete mixes were studied: concrete with NA (reference), 100 % direct replacement (DR) mix (RCA-100-DR) and 100 % strength-based replacement (SBR) mix (RCA-100-SBR). The latter was designed to achieve the same performance as concrete made with NA. Mixes were exposed to temperatures of 200 degrees C, 400 degrees C

Automated summary

The behavior of concrete made with recycled concrete aggregates (RCA) at room temperature has been well studied, but there are still unresolved issues regarding durability and high temperature conditions. This paper evaluates the impact of elevated temperatures on the durability of concrete made with RCA. Three concrete mixes were studied: concrete with natural aggregates (NA, reference), 100% direct replacement (DR) mix (RCA-100-DR), and 100% strength-based replacement (SBR) mix (RCA-100-SBR). The mixes were subjected to temperatures of 200 degrees C and 400 degrees C.