Development of a new short-term concrete prism test method (SCPT) to improve predictability for potential alkali reactivity of aggregates

Abstract

This experimental study basically aims to come up with a new method [SCPT], which would be a reliable accelerated performance for predicting potential alkali reactivity of aggregates, because available test methods whether long or accelerated, have some drawbacks such as long test duration in the CPT [concrete prism test] and false tests results in the AMBT [accelerated mortar bar test]. The new method called as short-term concrete prism test [SCPT] has been designed with analysing the degree of correlation between the designed new methods and available test method by examining 32 types of aggregate, whosefield performances can be observable. Common specifications of the SCPT includes 50 mm x 50 mm x 200 mm concrete prisms, 16 mm maximum aggregate size, storage temperature at 60 °C and soak solution with 0.35N NaOH + 1% CaCl 2 and takes only 28 days.