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Published in 1986 by theNational Institute for Transport and Road Researchof theCouncil for Scientific and Industrial ResearchP Box 395Pretoria
1 South Africa
rinted in the
G csir 94H1071 8602
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H are written for theed practice in selected as-frican experience andproval of the C omm ittee
circulated in draft form for a periofor approval. This document, Draring which you are welcome
ational Institute for Transport anday Materials om mittee of the
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he functions o
ie funksies van en vereistes vir
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.............................................................................................. iii
Functions of prime coat ................................................................... 2.................................................................
.............................................................................ess ................... .................S...m......
.......................................................nctions of a curing m raneiturninsus curi
ers ..................................................~.............................................................. .............. ........ .catisn..........................
........................................................................................................ .....,,.,...,.,. . . . . . . . .
4 a ..........m ................................................ 1
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tion tar tar or gasific
er pplied to a neavernent layer to which a cementitious
vii
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Primes and bituminous membranesTRH1 Pretoria South Africa 1986
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ion between a
b) It helps to seal the surface pores in the boisture and to
of the first spray of surfacine base near its surface by bin
rovides the base with a mporary protection amental effects of weather a t traffic until theconstructed.
is dependent on the density of the base; the denser the base, the lower
Where a bitumen or tar hot-mix base is laid over a granular subbase, the subba se should b e primed.Primes and bituminous membranesTRH1, Pretoria, South Africa, 1986
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teri l by the tyres.
en the ro d to t
ific tion crudeecification; refer to su
Other methods have also been found to be successful such as brooming or watering the primed sur-face followed by pneumatic-tyred rolling to wash off excess prime.Primes and bituminous membranesTR I , Pretoria, South Africa, 1986
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Primes and bituminous membranesTRX1 Pretoria South Africa l98
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is to receive an asphalt surf
t to the base is
case one must take into
f relatively I
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s soon as pois very moist
Primes and bituminous membranesTRX Pretoria SouthAfrica 1986
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as the job proceeds. Ine consistent with a rea-
hould ot be he ted to
ion to avoid overheat-
Primes and bituminous membranesTR I Pretoria South Africa 1986
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3 1entitious stabilize
etrimental carbonation or salt mic) It provides a waterproof mem rane which protects thee which may b e caused by sur
Thermal stresses in uced in the surface of the layer as a result of thlack memb rane may lead to the develo ment o cracks.
membranes are use only on cementedenetration of aayer before it
he most effective bituminous
oarseness of t
Primes and bituminous membranesTRH1 Pretoria South Africa l98
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he cementing process
er tures for bitumenemulsions
ituminous content Spraying erature
Primes and bituminous membranesTRH1 Pretoria South Africa 986
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e by the traffic.es to openin ed base to controlle
areas of the basof the prime is ensured.
uring the traffickincontrol notices should b
is not criticalsuitable for nor
pe of base. However the rate of a
effect of traffic is influence
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Primes and bituminous membranesTRH1 Pretoria South Africa 1986
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RGW. he de
specifics ion for ani
Primes and bituminous membranesTRH1 Pretoria South Africa 1986