Materials selection for concrete overlays : the final report Page: 21
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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Figure 2. 7.: Cooling down the prepared surface before placement
2.5.3 Surface Cleaning
Surface cleaning refers to the removal of dust and debris after the surface preparation is
complete and prior to the placement of the concrete overlays, to ensure that no foreign elements
interfere with the achievement of bonding between both layers. Any loose/foreign materials
present at the interface will act as a bond breaker and can cause delamination.
After the surface preparation operations are finalized and the reinforcing steel is in place,
the last cleaning of the surface is done by air blasting just before concrete placement. It should
be noted that air blasting and water blasting should be used only as supplementary cleaning
procedures for loose material and debris elimination from the surface after milling, shotblasting,
or sandblasting, because these methods are not capable of removing paint stripes, tire marks, or
grout matrix. Air blasting is to be used just before overlaying to thoroughly remove debris from
milling or shotblasting operations. It is important not to leave a large time lag between the final
surface cleaning and paving in order to prevent the contaminants from resettling. Figure 2.8
shows hydro cleaning as a way to clean the prepared surface.21
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Kim, Dong H.; Fowler, David W.; Ferron, Raissa P.; Trevino, Manuel M. & Whitney, David P. Materials selection for concrete overlays : the final report, report, July 2012; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth303706/m1/41/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.