MS for Prime Coat

8/13/2019 MS for Prime Coat

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Client : Saudi Arabian oil company

Contractor : Abdul Ali Al-Ajmi Company

Contract No. : 6600025881

Project : Site Preparation & Access roads; Shaybah NGL Recovery Project

1 Method Statement for Bituminous prime coat / Abdul Ali Al-Ajmi Co.

METHOD STATEMENT FOR BITUMINOUS PRIME COAT

Purpose

To detail the methods adopted with regard to application of Bituminous

Prime Coat on to the Aggregate Base Course layers, prior to laying of

asphaltic road construction layers.

Scope of work

i. Cleaning of surface to ABC layersii. Application of Bituminous Prime Coat

Reference Documents :

i. SAES-Q-006-Asphalt Concrete Paving.ii. Saudi Aramco Product Specifications

A-973 (Cutback Asphalt, MC-70)

A-974 (Cutback Asphalt, MC-250)

Inspection & Testing

i. Inspection & Testing of raw materials shall be done in accordance withSaudi Aramco Product Specifications A-973 (Cutback Asphalt, MC-70)

A-974 (Cutback Asphalt, MC-250), and application by site testing for

determination of spread rate.

ii. Prime coat shall be tested prior to applications and every 10,000 m.


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Preparation

i. All materials shall be submitted to the SAPMTs Representative forapproval with supporting documentation, prior to them being used on

site. No material will be used on site prior to receiving the above-

mentioned approvals.

ii. Ensure that all the previous construction layers have been tested, andsubsequently approved, by the SAPMTs representative prior to the

application of any Bituminous Prime Coat.

iii. All surfaces to be primed shall be thoroughly cleaned from foreignmaterials by blowing compressed air or hand brushing, immediately

prior to the bituminous application, and in any case, not more than two

hours before.

iv. If the surface to receive the Bitumen Prime Coat is excessively dry, itshall be lightly dampen with water in advance of the application of

prime coat. If too much water is applied, and ponding occurs, then the

surface will be allowed to dry naturally before any bituminous

application will be done.

Method

i. All Bituminous Prime Coat material(MC-70) shall be applied bymeans of a purpose built mechanical spray tank distributor, or by

pressure hand spray. Application temperatures will be between 50 C

to 80 C and the rate of application will not be less than 0.65 litres/m

2

,and not more than 1.75 litres/m

2and will be checked regularly.At all


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times, the temperature of the prime coat material shall be maintained

at least 10C below the flash point of the material

ii. Prior to the first application of the Bituminous Prime Coat on theproject, a rate of spray trial shall be done to determine the penetration,

and at each successive application, a test of the spray rate will be

undertaken to ensure that the distributor is correctly working and the

coverage rate is achieved.

iii. The prime coat shall be permitted to cure until the penetration intounderlying surface has been approved by Saudi Aramco

Representative, but at no time shall the curing period be less than 24

hours. Ponding will be avoided and shall be removed immediately if

occurring.

iv. Wherever there are adjacent items, such as concrete barriers, kerbstones, gutters, and the like, precautions shall be taken to prevent the

Bituminous Prime Coat from being sprayed on to them. Where

necessary, hand spraying of the Prime Coat will be done in localized

areas.

v. Bituminous primer will not be applied in adverse weather conditionssuch as sand storm and rain.

vi. Temporary barricades and warning signs shall be erected around areaof sprayed Bituminous Prime Coat to prevent any vehicle access on to

the newly primed surface. Any area where prime coat is disturbed

shall be repaired to the satisfaction of SAPMT's representative.

vii. Overlapping shall not be permitted at transverse joints and thick papershall be used to protect the previous application.

viii. The prime coat materials shall be applied to a width of 300 mmgreater on each side of the road than the specified width of thefinished surface


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ix. Priming will not be permitted when surface is wet.x. After the cleaning operations, prior to the application of primer, a

joint inspection shall be conducted.

xi. A trial run shall be conducted prior to start the actual work.Equipment:

The following equipments are to be utilized for this purpose:

i. Air Compressorii. Bitumen Spray Tanker

Health & Safety:

All operations will be carried out in a safe working manner, and in each &

every case, the practices adopted shall be fully in accordance with Saudi

Aramco Construction Safety manual.

MS for Prime Coat

Documents

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