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Published in 1986 by theNational Institute for Transport and Road Researchof theCouncil for Scientific and Industrial ResearchP0 Box 395Pretoria0001 South Africa

Printed in the

GAcsir 94H1071*8602

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H) are written for theed practice in selected as-frican experience a ndproval of the Com mittee

circulated in draft form for a periofor approval. This document, Draring which you are welcome

ational Institute for Transport a nday Materials om mittee of the

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The functions of

ie funksies van en vereistes vir

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.............................................................................................. iii

Functions of prime coat ................................................................... 2.................................................................

............................................................................. 3ess ................... .................S...m......

.......................................................nctions of a curing m raneiturninsus curi

ers ..................................................~..............................................................*.............. ........*.catisn.............................

.......................................................................... 1.............................. .....,,.,...,.,. . . . . . . . . 1

4. . a ............. 1.............................. m'................................................ 1

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tion tar. I ta r or gasific

er applied 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 subbase should b e primed.Primes and bituminous membranesTRH1, Pretoria, South Africa, 1986

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terial by the tyres.

en the road to t

ification 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 membranesTRHI , Pretoria, South Africa, 1986

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Primes and bituminous membranesTRX1, Pretoria, South Africa, l986

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is to receive an asphalt surf

t to the base is

case, one must take into

f relatively I\

Primes and bituminous membranesTRH1, Pretoria, South Africa, 1986

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s 'soon as pois very moist,

Primes and bituminous membranesTRX1 , Pretoria, SouthAfrica, 1986

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as the job proceeds. Ine consistent with a rea-

hould not be heated to

ion, to avoid overheat-

Primes and bituminous membranesTRHI , Pretoria, South Africa, 1986

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3.1entitious stabilize

etrimental carbonation or salt mi(c) It provides a waterproof mem rane which protects thee which m ay be caused by surThermal stresses in uced in the surface of the layer as a result of thlack membrane may lead to the develo ment of 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, l986

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he cementing process

eratures for bitumenemulsions

ituminous content Spraying erature

Primes and bituminous membranesTRH1, Pretoria, South Africa, 1986

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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. The de-

specifics ion for ani-

Primes and bituminous membranesTRH1, Pretoria, South Africa, 1986