stone mastic asphalt - csirasphalt.csir.co.za/bmlc/sma.pdf · stone mastic asphalt course feedback...
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Stone Mastic Asphalt
Course feedbackCourse feedback
Specification updateSpecification updateRob VosMartin van de VenDennis Rossmann
DiscussionDiscussionExpanded panel
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SMA
you&
me
BE
FO
RE
BE
FO
RE
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Performance of some Performance of some SMA says we areSMA says we are
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SMA - why a course?
hbasically a technology transfer from Europe
hnot only one European approach
hincreased interest locally
hstart-up problems
hsome lack of understanding of basics
hneed to fix the platform of knowledge
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Usage of SMA’s in Europe
Country Total Area (106m2) % 1996
Denmark 14 1.1Germany >100 8Netherlands 32 8Norway 12 3Poland 12Spain (BBM) 69Sweden 50 18
Equates to > 27 000 km of single lane roads
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SMA’s functional surfacecharacteristics
hgood skid resistance (safety)
han even surface (driver comfort)
hlow noise (environmental &
comfort)
hdurability - rut free (pavement performance)
himproved visibility (safety)
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Three day SMA course
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SMA course at Stellenbosch
hIngeborg Schröder - BP GermanyhHigh local inputh46 delegates
hclient bodieshsuppliershconsultantshcontractorshstudents
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What is a real SMA ?
according to Draccording to Dr Zichner Zichner 1960’s 1960’s
hself supporting stone skeleton
hbitumen rich mastic (“glue”)
hlow voids content (impermeable)
hefficient stabilisation of the mastichduring transport, constructionhprevent segregation
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Course contents
hFunctional / structural requirements of surfacings
hSMA mix design - spatial approach
hProduction, transport and construction
hProblems and failures
hLocal experience
hCost benefit
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SMA problem areas
hmix designhaggregrate requirementshspecification status and developmentshsmaller window for manufacture and
constructionhtighter quality control
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So where to with SMA’s
hstandardise the design approachhallow for changes to the current specificationhdevelop manufacture and placing guidelineshget ASPASA together in getting SMA’s to
work in SA