Stone Mastic Asphalt - CSIRasphalt.csir.co.za/BMLC/sma.pdf · Stone Mastic Asphalt Course feedback...
Transcript of Stone Mastic Asphalt - CSIRasphalt.csir.co.za/BMLC/sma.pdf · Stone Mastic Asphalt Course feedback...
Stone Mastic Asphalt
Course feedbackCourse feedback
Specification updateSpecification updateRob VosMartin van de VenDennis Rossmann
DiscussionDiscussionExpanded panel
SMA
you&
me
BE
FO
RE
BE
FO
RE
Performance of some Performance of some SMA says we areSMA says we are
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
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
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)
Three day SMA course
SMA course at Stellenbosch
hIngeborg Schröder - BP GermanyhHigh local inputh46 delegates
hclient bodieshsuppliershconsultantshcontractorshstudents
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
Course contents
hFunctional / structural requirements of surfacings
hSMA mix design - spatial approach
hProduction, transport and construction
hProblems and failures
hLocal experience
hCost benefit
SMA problem areas
hmix designhaggregrate requirementshspecification status and developmentshsmaller window for manufacture and
constructionhtighter quality control
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