Influence of texture on rolling resistance: experiments in the Netherlands

Jan Hooghwerff, M+P Consulting Engineers Paul Fortuin, Rijkswaterstaat, Center for Transport and Navigation

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Topics

influence of the road surface on rolling resistance road surface types in the Netherlands results form previous projects measurement program 2013

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Influence road surface on rolling resistance

texture unevenness

road stiffness

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Main subjects of the project

differences in rolling resistance due to different grades of the asphalt the state of maintenance

accurate texture – rolling resistance model primarily focused on passenger cars results based on measurements

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Silent road pavements in the Netherlands

dense asphalt stone mastic asphalt PAC 6/16

thin surface layers 2 layer PAC 4/8 or 2/6

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Relevant parameters

stone size texture (positive or negative) state of maintenance (ages, damage)

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MPD = 1*RMS => negative skew

MPD = 2*RMS => positive skew

RRc = Const + X∙MPD

Texture: MPD, RMS and skewness

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MPD = 1*RMS => negative skew

MPD = 2*RMS => positive skew

RRc = Const + X∙MPD + Y∙Rskew

(Rskew = MPD/RMS)

Texture: MPD, RMS and skewness

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Expected spread due to surface type

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Age-averaged RR difference for highways PAC 6/16 vs TLPAC 2/6

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What can we learn from previous studies? PAC 6/16 vs TLPAC 2/6

IPG Round Robin Test 2004 - 2005 difference 10% but: older version trailer … weather, age?

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Highway A30 – 2008 – measurements TUG

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RR difference: PAC 6/16 vs TLPAC 2/6

A30 measurements TU Gdansk difference: 17% but: new/old TLPAC vs new PAC

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Measurement programme 2013

start: March 2013 70 roads, 170 observation runs (RR, texture, T, tyre pressure) collaboration (Rijkswaterstaat, Province Gelderland) measurements by TU Gdansk and M+P

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Measurement sections

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Measurement sections

highways

regional roads

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Current estimation RR difference: PAC 6/16 vs TLPAC 2/6 age averaged: 25% total measurement uncertainty ± 7%

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Conclusions / summary

the influence of the texture of the pavement on rolling resistance is important relevant parameters are stone size, skewness of the texture

and the state of maintenance (ages, damage) measurements of rolling resistance and texture will be carried

out on 70 different road sections of highways and regional ways special attention will be given to the accuracy of the

measurements. we expect to find a significant difference between fine and

rough textures, for cars about 25% ± 7%

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Thank you for your attention

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