Hydrodemolition of Concrete Surfaces and Reinforced Concrete by Andreas Momber

By Andreas Momber

Content material:
List of used symbols and abbreviations

, Pages ix-xiii
Chapter 1 - Introduction

, Pages 1-22
Chapter 2 - basics of hydrodemolition

, Pages 23-65
Chapter three - Hydrodemolition equipment

, Pages 67-103
Chapter four - Concrete floor education through hydrodemolition

, Pages 105-147
Chapter five - floor caliber aspects

, Pages 149-172
Chapter 6 - Demolition with hydro-abrasive water jets

, Pages 173-205
Chapter 7 - Pulsed liquid jets for hydrodemolition

, Pages 207-239
References

, Pages 241-262
Index

, Pages 263-269

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Extra resources for Hydrodemolition of Concrete Surfaces and Reinforced Concrete

Example text

The proportionality coefficient CM is considered to be a machine parameter. Rehbinder (19 78) defined a so-called 'specific erodability' to evaluate the resistance of porous solids against water jet erosion. 2 m ~P r 0 E E ~. I. 4 4, Max. 17 Relationship between removal rate in concrete and characteristic length (Momber, 2003c); values correspond to Fig. 16 Fundamentals of H~jdrodemolition 41 The higher specific erodability, the lower the resistance. s]. The right term of Eq. 32) allows the experimental estimation of R E, whereby AhM/Ap is simply the progress of an erosion depthpressure function.

31), was verified by Werner (1991a). The proportionality coefficient CM is considered to be a machine parameter. Rehbinder (19 78) defined a so-called 'specific erodability' to evaluate the resistance of porous solids against water jet erosion. 2 m ~P r 0 E E ~. I. 4 4, Max. 17 Relationship between removal rate in concrete and characteristic length (Momber, 2003c); values correspond to Fig. 16 Fundamentals of H~jdrodemolition 41 The higher specific erodability, the lower the resistance. s]. The right term of Eq.

For the above assumed pressure of p= 140 MPa and the nozzle diameter of dN=3 mm, the length of the core zone is Xc=236 mm. 3, the ratio xc/d N can be utilised to evaluate nozzle quality; it is high for 'good' orifices, and low for rather 'bad' orifices. Thus, jet quality can characterise nozzle condition as well, and it can be used to monitor the condition of nozzles. In the transition zone, the flow velocity is a function of the jet radius, vj=f(r]). This radial velocity profile has a typical bell shape that can mathematically be described by exponential functions.

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