Abstract
Abrasive water jet (AWJ) breaking technology is suitable for the maintenance and repair of concrete structures, generating minimal dust, low tool wear, and no vibrations or selective destruction. The failure features and mechanisms of concrete subjected to AWJ impact are fundamental issues of AWJ breaking technology, which are also related to the safety and quality of engineering construction. Based on computed tomography (CT), scanning electron microscopy (SEM), and image processing technology, this paper studied the fragmentation pattern and removal mechanism of concrete under AWJ impact. The general failure characteristics and crack propagation law of concrete subjected to AWJ impact were described through AWJ impact concrete tests. The spatial distribution of damage in concrete subjected to AWJ impact can be divided into the intensive action zone, the transition zone, and the weak action zone. The removal mechanism of AWJ was discussed by comparing the impact performance of a pure water jet (PWJ) system. The results indicate that abrasive particles can cause cliff‐shaped fracture and lip‐shaped distortion in the aggregate part and flat fracture surface in the matrix part. There is no obvious crack in the interfacial transition zone (ITZ) due to the weakening of the water wedge effect.
Highlights
Concrete is the most widely used building material due to its good plasticity, low production cost, and high durability
This paper explores the removal mechanism of Abrasive water jet (AWJ) by comparing the impact performance of pure water jet (PWJ) with scanning electron microscopy (SEM) scans. e results can provide important theoretical bases for understanding the development law and derivation mechanism of microcracks in concrete under the impact of AWJ, which can help the technology be better applied in the maintenance and repair of concrete structures as well as in emergency demolition
The intense action zone of the jet is limited to the vicinity of the jet in a range that is approximately 20 times the jet diameter, the transition zone is in the range of 20 to 40 times the jet diameter, and the weak action zone of the jet is outside the range of 40 times the jet diameter
Summary
Concrete is the most widely used building material due to its good plasticity, low production cost, and high durability. Erefore, it is necessary to conduct in-depth studies on the general mechanical behaviors of concrete materials under water jet impact, such as the fragmentation patterns and removal mechanisms. E above simulation and experimental studies focused on the failure law and fracture mechanism of the water jet breaking of elastic, elastic-plastic, and brittle materials, which provides a foundation for exploring the failure characteristics and removal mechanism of AWJ impacting concrete materials. This paper attempts to investigate the fragmentation pattern and removal mechanism of concrete subjected to AWJ impact from macroscopic and microscopic perspectives, respectively It discusses the failure characteristics, crack extension law, and spatial distribution of damage by observing the external fragmentation pattern of concrete and CT scans. This paper explores the removal mechanism of AWJ by comparing the impact performance of pure water jet (PWJ) with SEM scans. e results can provide important theoretical bases for understanding the development law and derivation mechanism of microcracks in concrete under the impact of AWJ, which can help the technology be better applied in the maintenance and repair of concrete structures as well as in emergency demolition
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