trh1 : prime coats and bituminous curing membranes

8/12/2019 TRH1 : Prime Coats and Bituminous Curing Membranes

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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



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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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RGW. he de

specifics ion for ani


trh1 : prime coats and bituminous curing membranes

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