Effect of Abrasive Concentration on Impact Performance of Abrasive Water Jet Crushing Concrete

Abstract

It has been found that the impact performance of water jets can be changed by its properties, which include pressure, additive, and mode of jet. Thus, an abrasive water jet (AWJ) has been developed as a new method. However, there is little research on the effect of abrasive concentration on the impact performance of abrasive jets. Thus, the SPH method is used to establish an abrasive water jet crushing concrete model to study the effect of abrasive concentration on the impact force, concrete internal energy, abrasive particle distribution, crushing depth, and damage and crushing efficiencies under different concrete compressive strengths and abrasive densities. The results indicate that there is little effect of the abrasive concentration on the peak impact force under different compressive strengths and abrasive densities, while the mean impact force tends to increase linearly with the abrasive concentration. The internal energy of the concrete increases stepwise with the abrasive concentration under different compressive strengths and abrasive densities. The concentration of 10%∼20% is the rapid increasing stage. The crushing depth and damage efficiencies are all maximum at a concentration of 20% under different compressive strengths and abrasive densities. After the concrete was impacted by the water from the water jet, it is divided into rebounding particles and intrusive particles. The more the intrusive particles, the easier the concrete to be crushed and damaged.

Experimental and Statistical Study of High-Pressure Water Jet “Hydro-Demolition Technique” on Concrete for Partial-Depth Concrete Bridge Deck Repair Applications

“…However, Slabs 1 and 3 do not follow the general trend, owing to the heterogeneity of concrete mixing (compressive strength variability) as well as the limited number of specimens that were tested, owing to financial restraints. These results are as expected and agree with previous studies that show that, as material strength increases, the cutting time increases ( 15 – 17 ). The material removal rate is normalized to the compressive strength of concrete; then, using the equation of the line from Figure 7 and a known concrete compressive strength, the removal time for a particular compressive strength of concrete can be predicted.…”

A Review of CFD Modeling of Erosion-induced Corrosion Formation in Water Jets Using FEA

“…The impact efficiency of AWJ selection under limiting pressure was appraised in terms of such as the shape of the rock impact crater and rock stress, shear force [13] . Liu et al [14] studied the stroke capacity of AWJ breaking concrete depending on its abrasive concentration. Zhang et al [15] advanced a fluidic jet nozzle for use in manure inoculation from paddy fields by CFD.…”

“…The smooth particle hydrodynamics (SPH) technique was used to form the AWJ impact concrete model to examine the effect of corrosive concentration on the crushing force, concrete internal energy, corrosive spall distribution, impact depth, and detriment and impact performance under different concrete compressive strengths and abrasive intensities as shown in Figure 8 [14] .…”

Breaking mechanism and damage evolution rule of abrasive water jet impacting reinforced concrete

“…In recent years, scholars have conducted a lot of research and analysis to explore the mechanical mechanism of concrete and rock materials impacted by AWJ. For example, Liu et al 3 investigated the influence of crushing depth and crushing efficiency of AWJ concrete crushing under various parameters. The crushing morphology and removal process of an AWJ striking on concrete were examined by Liu et al 4 Qu et al 5 investigated the features of AWJ damage and the crushing process of shale.…”