Quality evaluation of concrete aggregate by weibull distribution analysis of AE

In order to develop a simple quality evaluation of recycled aggregate, an aggregate loading test is conducted. Simulating damaged recycled aggregate, natural aggregate and artificial aggregate are mixed as control samples and employed in the aggregate loading test. As the crushing values of aggregate increased along with the compressive load, it is found that the increase in the crushing values depends on the quality of aggregate. The crushing value and the acoustic emission (AE) in the compressive tests were analyzed by the Weibull distribution. The quality of samples was evaluated by m values. As a result, the ｍ values of the crushing values and the acoustic emission(AE) hits were well correlated with actual quality of samples. 1 INTORODUCTION found that the maximum load of 100kN was dis- satisfied to evaluate the mechanical strength of recy- A large amount of old structures are so increasing cle aggregate. According to the aggregate crushing 5) that they need to be renewed or repaired. As a re- test in the British standard (BS-812) , the maximum sult , a large number of waste concrete are gener- load of 400kN is prescribed. Accordingly, this re- ated. So, it is desirable to collect recycled aggregate search examines the validity of simple quality from waste concrete. Recently, renewal recycles evaluation of concrete aggregate by the aggregate technologies for concrete have been developed in loading test with the maximum load of 400kN. The Japan. These are a heating grinding method and crashing value is calculated after each 80kN was grinding method. They can collect high-quality re- loaded. Natural aggregate and artificial aggregate 1). In most cases, are applied to examine the validity of simple quality cycled aggregate of class H of JIS quality of recycled aggregate is evaluated by a den- evaluation. The crushing value is analyzed by the sity test, an absorption test and a sieve test etc. Be- Weibull distribution.