الفهرس 
Cu.rrent Practice For Construction And Qualit Control Of Hot-Mix Asphaltic Concrete.Only 14 pages are availabe for public view
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Abstract
The present r€search is an initiation to explore the
possibilities of application of the statistical qual~ty
control techniques 1n the construction of hot-mix asphaltic
concrete wee-ring surface for an airport pavement. The
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study also compared the engineering toler~~caB for both
aggregate gradation and asphal.t corrten t wi th \’!~lf\-(; may be
realistically expected on a ’\oTellcontrolled produotd.cn,
Special de3igned ’sampling plan Was doveloped for obt.:?iningunbd
ased (random) semp Le s of asphalt mixtures r rom
t~le hot-mix plant.
This plan ’Was reccmmonded for future
routine control.
Ninety six extraction tests have beon performed on
such sanp Le s and t.hus the corresponding asphalt content and
aggregate gradation values for each sanple Was obtained”
Pertinent statistical information: were determined
from the analysiS of the obtained data.
These statistical
information” were used in preparing the control charts.
Analysi s of data shows that, the natural tolerances
for bitumen oontent and aggregate gradation most of the
time, were outside the 6ngineering tolerances.
This is indi·cating a need for e1ther muchcloser control in plant
operation and tp.ater1als un1fo!”lu:l ty, or a revision of the
engineering tolerances.
Anewproposed set or statiztical toleT~~ces have
been determL~edbased on accepted level of s1gni~i~anee of
1-2%..
Extensive utilisation of the statistical methods to
evaluate all other characteristics and parameters of asphalt
mixture are needed, and studies ”1Ouldbe continued to
develop .the complete required data to prep a:::’e Standa:rJ
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Given control charts for all similar plant