A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Microscopic assessment of recycled concrete aggregate (RCA) mixtures affected by alkali-silica reaction (ASR)
Highlights Damage generation and propagation is different for CC and RCA concrete. CC presents higher damage than RCA concrete for the same expansion level. Mixtures with severely damaged RCA show higher expansions than slightly damaged RCA. Mixtures with severely damaged RCA display higher damage than slightly damaged RCA. DRI enables the distinction between “past” and “secondary” damage in RCA concrete.
Abstract Recycled concrete aggregates (RCA) are deemed an efficient approach to reduce waste yet, the presence of previous alkali-silica reaction (ASR) causes reservations towards its use in new construction. In this work, RCA specimens are manufactured in the laboratory incorporating RCA displaying distinct ASR past deteriorations (i.e. slight and severe). The samples are stored in conditions enabling further ASR development and monitored over time. Three levels of “secondary” expansion are selected for analysis, and upon being reached, microscopic evaluations are conducted through the Damage Rating Index (DRI). Results revealed that lower distress is observed in the RCA mixtures when compared to a companion conventional concrete at the same expansion level. Moreover, the damage mechanism of ASR-affected RCA concrete seems dependent on the RCA past deterioration since cracks tend to propagate into the residual cement paste or new cement paste for mixtures made of slightly or severely damaged RCA, respectively.
Microscopic assessment of recycled concrete aggregate (RCA) mixtures affected by alkali-silica reaction (ASR)
Highlights Damage generation and propagation is different for CC and RCA concrete. CC presents higher damage than RCA concrete for the same expansion level. Mixtures with severely damaged RCA show higher expansions than slightly damaged RCA. Mixtures with severely damaged RCA display higher damage than slightly damaged RCA. DRI enables the distinction between “past” and “secondary” damage in RCA concrete.
Abstract Recycled concrete aggregates (RCA) are deemed an efficient approach to reduce waste yet, the presence of previous alkali-silica reaction (ASR) causes reservations towards its use in new construction. In this work, RCA specimens are manufactured in the laboratory incorporating RCA displaying distinct ASR past deteriorations (i.e. slight and severe). The samples are stored in conditions enabling further ASR development and monitored over time. Three levels of “secondary” expansion are selected for analysis, and upon being reached, microscopic evaluations are conducted through the Damage Rating Index (DRI). Results revealed that lower distress is observed in the RCA mixtures when compared to a companion conventional concrete at the same expansion level. Moreover, the damage mechanism of ASR-affected RCA concrete seems dependent on the RCA past deterioration since cracks tend to propagate into the residual cement paste or new cement paste for mixtures made of slightly or severely damaged RCA, respectively.
Microscopic assessment of recycled concrete aggregate (RCA) mixtures affected by alkali-silica reaction (ASR)
Trottier, Cassandra (author) / Zahedi, Andisheh (author) / Ziapour, Rouzbeh (author) / Sanchez, Leandro (author) / Locati, Francisco (author)
2020-10-05
Article (Journal)
Electronic Resource
English
Mitigating Alkali-Silica Reaction in Concrete Containing Recycled Concrete Aggregate
| British Library Online Contents | 2006
Mitigating Alkali-Silica Reaction in Concrete Containing Recycled Concrete Aggregate
| British Library Conference Proceedings | 2006