Characterisation of Al corrosion and its impact on the mechanical performance of composite cement wasteforms by the acoustic emission technique

Abstract

Abstract. In this study acoustic emission (AE) non-destructive method was used to evaluate the mechanical performance of cementitious wasteforms with encapsulated Al waste. AE waves generated as a result of Al corrosion in small-size blast furnace slag/ordinary Portland cement wasteforms were recorded and analysed. The basic principles of the conventional parameter-based AE approach and signal-based analysis were combined to establish a relationship between recorded AE signals and different interactions between the Al and the encapsulating cement matrix. The AE technique was shown as a potential and valuable tool for a new area of application related to monitoring and inspection of the mechanical stability of cementitious wasteforms with encapsulated metallic wastes such as Al.

Corrosion behavior of aluminum alloy 5754 in cement‐based matrix‐simulating nuclear waste disposal conditions

“…Such cracking was previously reported by Spasova et al [9] and attributed to the mechanical stress generated in the cement matrix by the build-up of the corrosion products at the metal/cement paste interface. Such a possibility was also assumed by Godfrey et al [8] A crosssectional observation of the aluminum coupons after several months of exposure and after the appearance of the cracks at the surface of the cement blocks is presented in Figure 16.…”

“…The author attributed the decrease in corrosion to the build‐up of a protective corrosion scale of hydrated alumina that can, however, transmit stresses to the solidified cement matrix leading to possible cracking. [ 9 ]…”

“…The author attributed the decrease in corrosion to the build-up of a protective corrosion scale of hydrated alumina that can, however, transmit stresses to the solidified cement matrix leading to possible cracking. [9] According to the literature, the most important parameter for the corrosion of aluminum when encapsulated in a cement is the pH of the environment, either of the water present during the casting and setting period, or of the interstitial water that evolves chemically during and after the curing period. The pH of a cement matrix is determined by the equilibrium between water and the hydrated mineral species used in the formulation of cement.…”

Influencing Factors on the Healing Performance of Microcapsule Self-Healing Concrete

“…Due to the lack of a unified standard for the evaluation index of self-healing concrete, the most commonly used method is to compare the performance indices of concrete before and after damage. Some references used acoustic emission as the method to monitor and inspect mechanical behavior of cementitious structures [ 26 , 27 , 28 , 29 , 30 , 31 ]. In this paper, the recovery rate of the compressive strength and the recovery rate of the sound speed of the concrete were used.…”

Sensitivity of acoustic emission (AE) technology in monitoring oxide formation on an aluminium surface

“…In the presence of water, the surface will degrade and an oxide layer can build to a great thickness. AE technology has been used for corrosion monitoring, particularly for steels and its alloys (3,4,5,6) . Prateepasen et al (7) employed AE technology to detect the corrosion on austenitic stainless steel.…”