Fracture process and reliability of concrete made from high grade recycled aggregate using acoustic emission technique u
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ORIGINAL ARTICLE
Fracture process and reliability of concrete made from high grade recycled aggregate using acoustic emission technique under compression Ni Nyoman Kencanawati • Shinya Iizasa Mitsuhiro Shigeishi
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Received: 31 January 2012 / Accepted: 19 November 2012 / Published online: 28 November 2012 Ó RILEM 2012
Abstract The increasing amount of waste concrete makes desirable collection of high quality of recycled aggregate from waste concrete to be reused for construction. This research used high grade recycled coarse aggregate (RCA) created using pulsed power technology to make concrete specimens. Concrete created from natural aggregate was also prepared to compare the properties of concrete made using pulsed power recycled aggregate. Established acoustic emission (AE) parameter analyses which are AE hit, relationship between RA value and average frequency, and b-value of AE amplitude distribution were applied to analyze the concrete fracture behavior. In addition, AE Weibull analysis was also proposed to evaluate the reliability of the concrete. A set of AE measurement testing was applied to the concrete specimens during compression loading. At the age of 28 days, compressive strength reaches 35.4 MPa and Young’s modulus is 23.6 GPa. The results indicate that the fracture process and reliability of concrete made using pulsed power RCA is similar to that of natural coarse aggregate concrete suggesting that both concrete have
N. N. Kencanawati (&) Civil Engineering Department, Mataram University, Mataram, Indonesia e-mail: [email protected]; [email protected] S. Iizasa M. Shigeishi Graduate School of Science and Technology, Kumamoto University, Kumamoto, Japan
equivalent characteristic under compression. Furthermore, the good agreement results shared by AE Weibull analysis with those of other analyses suggesting this method can also be employed as one parameter to determine the condition of concrete. Keywords Pulsed power Recycled coarse aggregate Acoustic emission (AE) AE Weibull analysis
1 Introduction The large amount of waste concrete has been rising rapidly. To date, the conventional methods for waste concrete recycling have produced recycled aggregate of sufficient quality for being used as road bed material. Higher quality is required in for it to be able to be reused as aggregate for construction. In this research, pulsed power technology was applied to produce high grade recycled aggregate due to its better ability to remove cement paste from the aggregate compared to the conventional recycling methods and its minimization of damage to aggregate. A study on evaluation of high grade recycled aggregate produced using pulsed power method has been conducted [1]. Density and absorption test results of the aggregate meet the requirement for H (high) class set by Japanese Industrial Standard for recycled
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aggregate, proving its better quality to that produced by conventional methods [1, 2]. Other research has concentrated on mechanical properties of concrete made using t
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