砂封層技術國際平整度指數（IRI）.pdf

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1、Keep Alaska Moving through service and infrastructureKeep Alaska Moving through service and infrastructureSouthcoast Region-Sand Seal&IRI Keep Alaska Moving through service and infrastructure11/22/20232*Design Functional Class:Urban Collector Design Speed:40 MPH AADT:2648Project Engineer/Manager:Tra

2、vis EckhoffConstruction Project Engineer:Andrew HillsDesign Engineer:Rachelle MartensKeep Alaska Moving through service and infrastructureExisting Conditions Surface:SuperPave Type B,2009Binder Grade:64-28Ave IRI:96.34Ave Rut Depth,inches:0.28Ave Crack%:0.56Lane width,ft:12Keep Alaska Moving through

3、 service and infrastructureLimitations Do not apply sand seal after September 15 Sand seal shall only be applied when the existing pavement has been dry for at least 4 hours There is no rain forecasted within the curing period Pavement surface temperature is a minimum of 50FKeep Alaska Moving throug

4、h service and infrastructureKeep Alaska Moving through service and infrastructureMaterial Specifications:Emulsified AsphaltGSB 88Emulsion concentrate diluted 1:1 with hot water by volumeCuring time,under recommended application conditions,shall not exceed 4 hoursMaterial Specifications:Sand Aggregat

5、eDry,clean,angular,dust-free min Mohs hardness:7Gradation Requirements:Keep Alaska Moving through service and infrastructureEmulsion temperature in Tank:135 degrees FEmulsion temperature,treated surface:90 degrees FTemperature of pavement surface:76 degrees FKeep Alaska Moving through service and in

6、frastructureTwin Lakes Sand Seal Cost SummaryItemQuantityUnitUnit PriceCostCost per SYCost per Lane-Mile(2)Est Total Cost Est Cost per Lane-Mile Emulsified Asphalt Sand Seal6933SY12.50 86,663 12.50 73,319 733,185 73,319 Mobilization/Demobilization1LS30,000 30,000 4.33 25,381 65,000 6,500 Survey1LS10

7、,000 10,000 1.44 8,460 18,000 1,800 Traffic Maintenance1LS30,000 30,000 4.33 25,381 75,000 7,500 SWPPP1LS22,000 22,000 3.17 18,613 22,000 2,200 Construction Inpsection-40,000 40,000 5.77 33,841 100,000 10,000 Design/Environmental/ROW(1)-70,000 70,000 10.10 59,222 90,000 9,000 Total:288,663 41.64 244

8、,215 1,103,185 110,319 Notes:(1)these are fixed cost that remain largely the same due to economy of scale.(2)Lane miles for this project=1.18210 Lane-Mile ProjectKeep Alaska Moving through service and infrastructureKeep Alaska Moving through service and infrastructureKeep Alaska Moving through servi

9、ce and infrastructureSouthcoast Region IRI Smoothness Analysis2011-2023Keep Alaska Moving through service and infrastructureSouthcoast Region IRI Smoothness TrendsKeep Alaska Moving through service and infrastructureSouthcoast Region IRI Smoothness TrendsCurb&GutterKeep Alaska Moving through service

10、 and infrastructureSouthcoast Region IRI Smoothness TrendsReconstructKeep Alaska Moving through service and infrastructureSouthcoast Region IRI Smoothness TrendsMill&FillKeep Alaska Moving through service and infrastructureSouthcoast Region IRI Smoothness TrendsReconstructCurb&GutterMill&FillKeep Al

11、aska Moving through service and infrastructureSouthcoast Region IRI Smoothness TrendsCR IRI Max=114CR IRI Ave=68CR IRI Min=40Keep Alaska Moving through service and infrastructureSouthcoast Region IRI Smoothness TrendsSummary Curb and Gutter tend to have higher(rougher)post construction smoothness va

12、lues.These projects tend to be shorter and have more appurtenances in the roadway.Other factors can impact ride quality:1)Size/Length of project,2)Method used to determine smoothness,3)Type of Project,4)Construction Quality,5)Workforce availability,6)Weather.Recently,the types of project in SR have been Curb&Gutter,with one reconstruct,potentially skewing the trend.IRI trend appears to be moving towards rougher post construction roads.Keep Alaska Moving through service and infrastructureThank You!Brett Nelson,Alaska DOT&PF