Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance (2022) / Chapter Skim
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Pages 66-70
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From page 66... ...
66 Key Findings Pavement engineers have long known that an excess of water in pavement structures can cause or exacerbate slope instability above and below roadways, visible pavement distress, and diminished pavement strength, stability, and durability. Pavement subsurface drainage systems are intended primarily to remove water that infiltrates pavement structures in a timely manner so it will not weaken unbound base and subgrade layers and exacerbate pavement deterioration.
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From page 67... ...
Summary of Key Findings and Topics for Future Research 67 peak seasonal precipitation levels are low or where the natural soils in place before the pavement structure are moderately to well drained)
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From page 68... ...
68 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance bases up to 18 in. in thickness have been used for subsurface pavement drainage, and after more than 25 years of service, the pavement sections are reported to be in good to excellent condition, with minimal weed growth in the daylighted shoulder areas.
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From page 69... ...
Summary of Key Findings and Topics for Future Research 69 Missouri conducts video inspections of up to 500 ft of the mainline pipe at up to 10% of the lateral outlets after all paving is completed. Repair or replacement of damaged or deficient portions of the outlets or longitudinal pipes must be performed at the contractor's expense.
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From page 70... ...
70 Subsurface Drainage Practices in Pavement Design, Construction, and Maintenance pavement bases in the state and concluded that gradation adjustments were sometimes required to achieve adequate stability at the expense of some degree of permeability. Notably, however, only two DOTs reported that they had used performance study results to establish cost estimates or pavement life estimates for design purposes.
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