MS-CS01 - Application of Slurry
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OPERATIONAL METHODSTATEMENT
DOCUMENT DETAIL
DOCUMENT TITLE: APPLICATION OF SLURRY
DOCUMENT NO: MS-CS01
REVISION: 0
EFFECTIVE DATE: NOVEMBER 2008
ISSUED BY:
NOTICE: This document takes into account the particular instructionsand requirements of the client. It is not intended for, andshould not be relied upon by any third party and noresponsibility is undertaken for any unauthorised use.
PROJECT & CONTACT DETAIL
PROJECT:
CONTRACTSMANAGER:
TBA
Office: +27 [Number]; Fax: +27 [Number]; E-mail: [E-mail Address]
CLIENT: TBA
Office: +27 [Number]; Fax: +27 [Number]; E-mail: [E-mail Address]
CONSULTINGENGINEERS: TBAOffice: +27 [Number]; Fax: +27 [Number]; E-mail: [E-mail Address]
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METHOD STATEMENT
RESIDENTENGINEER
TBA
Office: +27 [Number]; Fax: +27 [Number]; E-mail: [E-mail Address]
REVISION HISTORY
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ORGANISATION NAME SIGNATURE DATE
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METHOD STATEMENT
Table of Contents
1 Purpose.........................................................................3
2 References....................................................................3
3 Definitions.....................................................................3
4 Responsibilities..............................................................3
5 Method..........................................................................3
6 Records.........................................................................5
7 Attachments..................................................................5
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METHOD STATEMENT
1 PURPOSE
2 REFERENCES
3 RESPONSIBILITIES
4 METHOD
4.1 Work Instruction
Mixing, transporting, and spreading of both slurry layers as part of theCape Seal.
4.2 Control of the Process
The process will be controlled as per the Project Quality Control Plan, atthe points and frequencies as indicated in the Method Statement.
4.3 Method Statement
a) Scope
This method statement include all the processes required to mix,transport and spread both slurry layers on the completed tack andchip layer.
The method statement for applying the tack and chip is coveredunder a separate work instruction.
b) Mixing Slurry
Batching of the slurry materials will be based on mass proportionsas per the Engineers design.
The slurry will be mixed by means of truck mixers, loaded strictly asfollows,
o Dry aggregate will be loaded into the dry weigh batching
plant by means of an articulated front-end loader and accuratelyweighed to a pre-determined amount. Cement will be added to
the dry aggregate after weighing the aggregate and loadedsimultaneously with the aggregate. The conveyor system on thebatch plant will transport the dry aggregate into the mixer truckand mixed until a uniform mix of aggregate and filler is obtained.
o Water required will be measured from the bulk supply
storage tank by means of a suitable measuring container andapproximately 80% of the required water will be gravity fed intothe mixer truck and thoroughly mixed with the aggregate andfiller.
o Stable grade emulsion will be measured off from the bulk
supply storage tank by means of a suitable measuring drum and
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METHOD STATEMENTgravitated into the mixer truck and thoroughly mixed with theother constituents
o The last 20% of the measured off water will then be fed
into the mixer truck and the entire load is then mixed until asmooth creamy consistency is obtained.
The foreman will check the following,
o That the correct grade of dry aggregate is identified prior
to batching.
o That the water is obtained from approved sources.
o That the moisture content of the dry aggregate has been
checked and that any adjustments required are instructed to thebatching plant operator.
The following quality assurance procedures will be applicable,
Hold point, until the slurry design is approved, eachsection to be slurried.
Witness point; that the correct grade of emulsion andsuitably tested and or sampled has been delivered to the bulksupply tanks at the batching plant, each load of bitumenreceived.
Witness point; that the weather conditions are withinthe prescribed limits. Each section to be slurried.
c) Transporting and Placing the First layer Slurry
The mixed slurry is transported to site by means of the mixer trucksand placed on the road in small batches by means of a chute, theslurry will then be spread by hand as prescribed by the standardand contract specifications.
The process required spreading the slurry and finishing off the layerprior to final rolling is adequately described in the specifications.
The tack and chip layer will be rolled by means of an approved flatwheel roller, rolling will be done early in the morning.
The foreman will check the following,
o That the section to be slurried is properly set out in terms
of widths and lines.
o That the road is sufficiently damp to receive the slurry.
o That the slurry is struck off level with the tops of the
aggregate.
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METHOD STATEMENTThe following quality assurance procedures will be applicable,
Hold point, no slurry may be placed until the Engineerhas approved the layer for slurry, each section.
d) Compacting the First Layer SlurryAfter the emulsion in the slurry has sufficiently dried off (broken)then the layer will be compacted by means of a pneumatic tyre-wheel roller. Rolling will continue until the slurry layer exhibits aclose-knit well-compacted finish.
The foreman will check the following,
o The timing is critical when to start the rolling of the slurry.
o At lest three roller-passes will be required.
The following quality assurance procedures will be applicable,
Witness point, rolling of the slurry is completed, eachsection of slurry applied.
e) Transporting and Placing the Second Layer Slurry
Transporting and placing the second slurry will be carried out usingthe same processes as for the first layer, except for the following,
o The slurry will be applied in half width construction.
o The mix design will be specific for the second layer slurry
The following quality assurance procedures will be applicable,
Hold point, no slurry will be placed until the Engineerhas approved the layer for slurry, each section to be slurried.
f) Compacting the Second Layer Slurry
The second layer slurry will be compacted in the sameway as the first layer slurry.
The foreman will carry out the same checks as forcompacting the first layer slurry, except for the rolling that willcarry on until the permeability is less than 1 l/hr.
The following quality assurance procedures will be applicable,
Witness point, the slurry layer is sufficiently compacted,each layer of section of slurry applied
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METHOD STATEMENT
5 RECORDS
6 ATTACHMENTS
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