Automated Asr Concrete Prism Testing At 60 Degrees C

Automated ASR Concrete Prism Testing at 60 degrees C The Concrete Prism Test at 60 degrees C (60 degrees C-CPT) is a common method to evaluate the susceptibility of concrete and aggregates to the Alkali-Silica Reaction (ASR). This paper presents a new device for an automated version of the 60 degrees C-CPT. The system monitors the expansion of concrete prisms automatically. Compared to the conventional test method, effort and time consumption are notably reduced. The nearly continuous recording of expansion signals allows for studying of ASR-mechanisms in more detail than the conventional test. In addition, the interruptions of ASR-provoking storage, necessary for manual measurements, are avoided. The presented study compares results of conventional and automated testing of two types of aggregate. In accordance with previous findings, continuously stored prisms generally expand less than the conventionally tested prisms. To find a possible explanation, differences in leaching of alkali from the concrete prisms were quantified. For verifying the alkali-reactivity of the two aggregates, they were also classified in the fog chamber test at 40 degrees C, the German reference method.