Texturing of Concrete Pavements (2009) / Chapter Skim
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Pages 81-91
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From page 81... ...
When selecting a texture, it is paramount that safety, in the form of minimizing the potential for wet-weather crashes caused by inadequate friction, hydroplaning, or splash/spray, take precedence over designing for all other surface characteristics (e.g., noise, rolling resistance, tire wear, and fuel consumption)
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From page 82... ...
Climatic Conditions Design Speed Highway Setting & Adjacent Land Use Contractor Experience Agency Experience & Policies Step 2 -- Friction Analysis Step 4 -- Selection of Preferred Texture Target Friction Levels Friction/Texture Matrix (Identification of Candidate Textures) Feasible Texture Options Noise Regulations & Preferences Target Noise Levels Noise/Texture Matrix (Identification of Candidate Textures)
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From page 83... ...
. Step 2 -- Feasible Textures Based on Friction Requirements With consideration of all relevant project information, an assessment can be made to determine the level of friction required over the life of the new or rehabilitated pavement and the types of textures that can provide the friction requirements.
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From page 84... ...
The friction–texture plots shown in Figure 6-3 and the macro-texture information provided in Table 6-2 have been used to identify feasible textures based on friction requirements. Table 6-3 identifies suitable general texture types for new concrete pavements with anticipated specific long-term DFT(20)
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From page 85... ...
Range Burlap, Broom, Std Turf Drag Heavy Turf Drag Tran Tine Long Tine Long Diamond Grind Long Groove EAC Porous PCC >80 70 to 80 60 to 70 50 to 60 40 to 50 A (F(60)
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From page 86... ...
Identification of textures for restoration of existing concrete pavements based on friction requirements and expected long-term micro-texture.
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From page 87... ...
The data collected in this study show a general relationship between the noise measured at the source and the noise measured inside the vehicle. If lower interior noise levels are required for a project, then a lower target level should be selected as the basis for the identification of feasible textures.
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From page 88... ...
EAC & Porous PCC Shallow texture Deep texture Increased depth results in greater overall noise. ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ Narrow spacing (≤ 0.75 in.
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From page 89... ...
and noise. Step 4 -- Selection of the Preferred Texturing Alternative The last step in the texture selection process involves evaluating the adequacy of feasible textures with consideration of other important surface characteristics, such as splash/spray, fuel consumption and rolling resistance, and cost-effectiveness.
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From page 90... ...
Texture Construction Specifications and Practices Appendix F, available on line at the TRB website, contains sample guide specifications for the following selected group of concrete textures that provide good friction and noise characteristics on high-speed pavements: • Heavy turf drag • Transverse skewed variable tine • Longitudinal tine • Longitudinal diamond grind • Longitudinal groove.
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From page 91... ...
. • For heavy turf drags, the potential for significant mortar build-up and release should be considered because this can influence the surface profile and increase roughness.
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