013-MS for Mass Concrete Works.pdf

Pearl GTL Project

LINDE ENGINEERING

Shell Project No: HP-3000-QAT Contractor Project No: 5887

Project Document Number: T- 4.234.079 Project Rev.: E Page 2 of 21

Purchase Order Number:

2MH127

Tag/Item Number(s): N/A

Unit(s): ASU

PCWBS: Z

QATAR SHELL GTL PROJECT (PEARL) C2 AIR SEPARATION UNITS CONSTRUCTION

I E 16.11.08 Ready For Construction SB EO AG RFC

H D 18.08.08 Issued for Company Comments SB EO AG ICC

G C 09.01.08 Ready For Construction SB UA/MC ZG RFC

F B 04.12.07 Company Comments Incorporated IU UA/MC ZG CCI

E A 08.11.07 Company Comments Incorporated IO MC ZG CCI

D O 29.10.07 Issued for Company Comments IO MC ZG ICC

C 30.10.07 Issued for Review IO MC ZG IFR

B Issued for Review IO MC ZG IFR

A Issued for Internal Review IO MC ZG IIR

GAMA Rev.

Project Rev

Date Description Prepared

By Checked

By

Approved By

Status

No. No. ORIGINATOR

LINDE ENGINEERING AG

Document Title:

METHOD STATEMENT FOR MASS CONCRETE WORKS

Contractor

Gama Qatar Co. W. L. L.

Document No. LOC470

GAM MTS CIV GTL 013 I

Org.

Code

Doc.

Type

Disc. Code

Geogr. Area

Seq.

No

Rev. No

Vendor Code

Project Document Number: T- 4.234.079

Rev No: E

Doc. Title : MS FOR MASS CONCRETE WORKS

Doc. No. : GAM-MTS-CIV-GTL-013 Date : 19.11.2008 Rev. I

T-4.234.079 Rev. E

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TABLE OF CONTENTS

1. INTRODUCTION ____________________________________________________________________ 5

2. SCOPE _____________________________________________________________________________ 5

3. HSSE ______________________________________________________________________________ 5

4. REFERENCES ______________________________________________________________________ 6

5. DEFINITIONS ______________________________________________________________________ 6

6. STANDARDS ________________________________________________________________________ 6

7. MEASURING INSTRUMENTS _________________________________________________________ 7

8. INSTALLATION REQUIREMENT & CRITERIA __________________________________________ 7

9. MEASURING HEAT OF HYDRATION __________________________________________________ 7

10. PRECAUTIONS FOR MASS CONCRETE ______________________________________________ 8

General __________________________________________________________________________________ 8

11. ATTACHMENTS ___________________________________________________________________ 8

Calibration Certificate for Data Logger _______________________________________________________ 8

Job Safety Analysis _________________________________________________ Error! Bookmark not defined.



T-4.234.079 Rev. E

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1. INTRODUCTION

The American Concrete Institute (ACI) defines mass concrete as: any volume of concrete with dimensions large enough to require that measures be taken to cope with the generation of heat from hydration of the cement and attendant volume change to minimize cracking (ACI 207.1R-05). However, for simplicity, all concrete structure of which the smallest dimension is greater than 800 mm is considered to be mass concrete.

This document covers the methods and extra precautions that may be required for any volume of mass concrete. The precautions before, during and after the pouring are explained.

The only difference between Normal concrete and Mass concrete is the insulation and the installation / monitoring of thermocouples to control the Heat Of Hydration. All other aspects as pouring, curing, removal of formwork are the same for both normal and mass concrete.

2. SCOPE

The preparation of formwork and reinforcement (including cutting and bending), as well as the pouring of the concrete is beyond the scope of this document, except for the precautions required for the control of excessive Heat of Hydration.

Some considerations for thick blocks (d > 0.6-m), like the verification of method by trials and the use of thermocouples, are also discussed in this document.

The form work of mass concrete shall be insulated & thermocouples be installed. As soon as possible after completion of the pouring the top surface of the fresh concrete shall also be insulated.

The repair of cracks and honeycombing is also beyond the scope of this document.

3. HSSE

All works shall be in compliance with the State of Qatar laws and regulations, Ras Laffan Industrial City and international standards/codes, and Company and Contractor requirements and instructions.

All personnel will go through Gama, Linde and Company Safety Induction courses as well as other trainings as identified by their supervisor. For details, reference is made to GTL-GM-001-A-5635.

A Job Safety Analysis (JSA) specific for this work including a Risk Assessment, is prepared as per Gama procedure GTL-GM-001-A-5626 and is attached herein. Such JSA addresses the hazards associated with each task within the scope of this Method Statement and introduces the controls that will be implemented to reduce the associated risks to acceptable levels. The JSA will be used by the Site Supervisor as the basis of his TSTI / TSTO and Toolbox Talks.

All personnel will have PPE required for their specific tasks in addition to the minimum PPE (coveralls, safety goggles, safety shoes, high-visibility vests, gloves) at site at all times as required.

In the event of a release, fire or explosion, employees will secure their area and evacuate to the nearest muster point. Once all employees are evacuated the supervisor will conduct a headcount to verify all employees are out of harms way. The supervision will report this to Contractor. Emergency Contact numbers for Company, Contractor and Gama will be posted onsite.

All vehicles and equipment used for the subject work will be inspected and certified as required.



T-4.234.079 Rev. E

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Drivers and operators will be competent and will have attended all required trainings set forth in project procedures and specifications.

All rebar ends will be protected by capping.

4. REFERENCES

DEP 31.00.01.30-Gen : Minimum Requirements for Structural Design and Engineering

DEP 34.19.20.31-Gen : Reinforced Concrete Foundations and Structures

DEP 34.24.27.31-Gen : Reinforced Concrete Stacks

T-13.376.358 : Amendments and/or Supplements to Reinforced Concrete Foundations and Structures

T-13.376.351 : Amendments and/or Supplements to Minimum Requirements for Structural Design and Engineering

T-13.376.365 : Concrete General Notes and Abbreviations

T-13.376.392 : Selection of Structural Concrete Mix

T-4.234.541 : QC Documents for Concrete Works

T-4.234.075 : Method Statement for Concrete Works

Experience, procedures, specifications of QCS Project

5. DEFINITIONS

Company : QSGTL and/or its PMC

Contractor or Linde : Linde Engineering AG

Subcontractor or Gama : Gama Qatar Co. W. L. L.

Contract : QSGTL Pearl Plant C2 ASU Construction Works

QCP : Quality Control Procedure

ITP : Inspection and Test Plan

QA/QC : Quality Assurance / Quality Control

JSA : Job Safety Analysis

GGBS : Ground Granulated Blast furnace Slag

6. STANDARDS

BS 1377 Methods of Test for Soils for Civil Engineering Purposes, Part 1, 2 and 3

BS 1881 Testing Concrete, Part 105:1984

BS 4449 Specification for Carbon Steel Bars for the Reinforcement of Concrete

BS 5328,

BS 5328-1: 1997 Part-1 Guide to Specifying Concrete

BS 196 Method of Testing Cement

BS EN 196-1 Determination of Strength

ACI 318 Building Code Requirements for Reinforced Concrete

ACI 305R Hot Weather Concrete



T-4.234.079 Rev. E

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ACI 306R Cold Weather Concrete

ASTM C 143 Tests for Slump of Portland cement Concrete

CEB-FIP Model Code1990 CEB-FIP Model Code 1990 (for Concrete Structures), Bulletin No. 213/214

7. MEASURING INSTRUMENTS

K Type Thermocouple-ETI Thermometer

8. INSTALLATION REQUIREMENT & CRITERIA

In T.13, 376.358 Rev G (Amendment / Supplement to DEP 34.19.20.31) paragraph 7.4 is specified:

A minimum of 2 thermocouples shall be placed where the maximum temperature is expected, one as back-up in case of failure or damage. A minimum of 6 thermocouples shall be installed around the edges, generally at half-depth points and top and bottom surfaces. At least one thermocouple shall be installed at an upper corner. For large pours where plan dimensions exceed 10 meter, groups of two centrally placed and six peripheral thermocouples shall be repeated at 5 meter intervals along the concrete element.

In DEP 34.19.20.31 paragraph 7.4 specified:

The heat of hydration shall not cause a temperature differential between the interior of the concrete and any outside face greater than 15 degree C.

The insulation shall routinely be done with 5 cm polystyrene. The insulated formwork and the insulation on top of the concrete shall not be removed until the temperature differential between the core and ambient is 15 degrees C (refer to paragraph 3.26, point 9.9 of T-13.376.358). The temperature monitoring can also stop at this point.

An NCR shall be raised immediately is the temperature differential has exceed the project specified 15 degree C. In this situation an RFI shall be submitted to Company for a common inspection of the concrete (as soon as possible after the 10 days curing period) to assess a possible adverse effect on the concrete due to the higher than 15 degree C temperature differential.

Further, Company and Contractor shall discuss and agree the measures to be taken (e.g. thicker insulation, ordering fresh concrete with a lower temperature, etc.), to mitigate re-occurrence and adverse effects.

9. MEASURING HEAT OF HYDRATION

The thermocouple will be K type placed on the rebar at 50 mm, below/above surface and centre as stated above. No thermocouples & their wires shall be placed inside the concrete cover area of 50mm.

The temperature reading will be taken using digital thermometer. The model number of the thermometer is ETI capable of measuring temperature between -30C to 300 C. The heat of hydration will be measured at the interval of;

1 HR - 1st day

3 HR - 2nd day

6 HR - 3rd day

12 HR - 4-7 days



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10. PRECAUTIONS FOR MASS CONCRETE

GENERAL

For curing, as per project requirement is 10 days (T.13.376.358-item 9.19- Paragraph-3.26).

11. ATTACHMENTS

JOB SAFETY ANALYSIS

CALIBRATION CERTIFICATE FOR DATA LOGGER

JOB SAFETY ANALYSIS FORM

JSA For: T-4.234.079 Page No: 1 of 8 Job being analysed: MS-Mass Concrete WorksDepartment/Section doing JSA: HSSE & Construction JSA Members:

Job Performers:Normal Approvals: Name Signature Date General job requirements / Common Personal

Protective Equipment.JSA by:

Job Supervisor: 1. The following Personal Protective Equipment shall be worn:Approved coveralls, safety goggles, safety helmet, safety shoes and gloves.

Additional Approvals (Determined by Job Supervisor in correlation with Linde HSSE Manager).Name Signature Date

Discipline Superindent (Linde)

HSSE Representative (Linde)

OTHERS (List Below): 2.Permit To Work.

Approval required for hazardous work detailed in the Linde Work Permit Procedure.Changing conditions and emergency proceduresStop work. Switch off equipment.Supervisor directs personnel to nearest and safest muster point considering wind direction. Supervisor counts all employees. Missing employees are reported to Linde HSSE Dept. When all clear is given, check with Linde HSSE before returning to work.

LINDE EMERGENCY TELEPHONE NO. HSSE MANAGER: Pearl HOT LINE :

NEW REVISED

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RISKRANK

1.1 Falling or dropped loads.C 5 HIGH

1.1.11.1.21.1.3

Third party crane inspections.Daily crane checks.Competent riggers.

1.1.1.1 Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards

B 3 LOW

1.2 Overturning of machine.

B 5 MED

1.2.11.2.2

1.2.3

SWL properly displayed.Qualified and 3rd party certified operators.Set up crane on solid level ground

1.2.1.1

1.2.1.2

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Ensure daily check is performed prior to each use.

B 3 LOW

1.3 Improper rigging.

C 5 HIGH

1.3.11.3.2

1.3.3

Competency check for all riggers.Rigging supervisor to monitor rigger performance.Ensure that the riggers are competent and Third Party certified.

1.3.1.1

1.3.1.2

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Rigging operations shall be performed by competent and qualified riggers.

B 3 LOW

1.4 Damaged, worn or unusable rigging equipment and/or gears.

C 5 HIGH

1.4.1

1.4.2

1.4.3

Quarterly inspection of lifting gear by Third party and color coded.Removal and isolation of all worn or damaged lifting equipment.Rigging gear shall be color coded as per Contractor procedure.

1.4.1.1

1.4.1.2

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Ensure that all rigging gear are has 3rd party certificates.

B 3 LOW

1.5 People struck by suspended or swinging load. B 5 MED

1.5.1

1.5.21.5.31.5.4

Barricade and secured area and install safety sign boards.Use tag lines to control load.DO NOT lift load over people.Do not allow people to walk under the load.

1.5.1.1 Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed. B 2 LOW

2 Manually transferring of stock rebars, to rebar cutting machine.

2.1 Manual handling.

C 2 LOW

2.1.12.1.2

2.1.32.1.42.1.5

Worker to wear appropriate gloves.Break the load into manageable portions.Lift with your legs not your back.Use the buddy system, Get help.Provide pictorial sign boards with correct lifting position.

2.1.1.1 Provision for lifting aids when practical.

B 1 LOW

CONTROLSMAIN

CONTROLSITEM ACTIVITY CPCONSEQUENCESHAZARDS / POTENTIAL RP CADDITIONAL

JOB SAFETY ANALYSIS / RISK ASSESSMENTFOR T-4.234.079

SCOPE : MASS CONCRETE WORKS

Residual RiskInitial Risk

1 Unloading rebar from delivery truck with crane to rebar stock area.

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MAINCONTROLSITEM ACTIVITY CPCONSEQUENCES

HAZARDS / POTENTIAL RP CADDITIONAL




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2.2 Debris and materials causing slip, trips and falls. B 2 LOW

2.2.12.2.2

2.2.3

Adequate stacking of materials.Regular housekeeping practices and removal of trash and unnecessary items.Maintain access and walk paths.

B 1 LOW

3.1 Hand and finger injuries.B 2 LOW

3.1.1 Wear approved PPE, safety goggles, safety helmet, safety shoes, gloves, high-vis vests

B 1 LOW

3.2 Manual handling of rebar.

B 2 LOW

3.2.1 Approved quality hand gloves, available in a full range of sizes to ensure proper fit to maintain dexterity.

B 1 LOW

3.3 Rebar cutting machine.

B 3 LOW

3.3.1

3.3.2

3.3.3

Competent operators, trained on the machine they operate.Ensure that the guards are properly installed and are being used.Post near machine the manufacturers safe operating procedures in different languages.

3.3.1.1

3.3.1.2

3.3.1.3

Post the manufacturer safe operating manual near the machine and HSSE office.Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Minimum 4 persons-Team leader with 3 helpers.

B 1 LOW

3.4 Defective equipment.

B 3 LOW

3.4.1

3.4.2

3.4.3

Daily inspection of equipment by operator prior to use according to manufacturers recommendations.Current Contractor inspection certificate.Monthly equipment inspection and color code.

3.4.1.1 Proper maintenance performed by maintenance department according to manufacturers recommendations. B 1 LOW

4.1 Manual handling.

C 2 LOW

4.1.14.1.2

4.1.34.1.4

Worker to wear appropriate gloves.Break the load into manageable portions.Lift with your legs not your back.Use the buddy system, Get help.

4.1.1.1 Provision for lifting aids when practical.

B 1 LOW

4.2 Debris causing slip trips and falls. B 2 LOW

4.2.14.2.2

Adequate stacking of materials.Regular housekeeping practices and removal of trash and unnecessary items.

B 1 LOW

3 Measuring and cutting rebar to length.

4 Transferring cut rebars from cutting machine to rebar bending machine.

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5 Setting up rebar bending machine to perform desired bend.

5.1 Hand and finger injuries.

B 3 LOW

5.1.1

5.1.2

5.1.3

Follow manufacturers recommendations for properly and safely setting up rebar bending machine.Control of hazardous energy, LO/TO. de-energize equipment" before making adjustments to moving parts.Wear approved hand gloves for the task.

5.1.1.1

5.1.1.2

5.1.1.3

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Minimize number of people at work area of bending/cutting machine.Mark the work area.

B 1 LOW

6 Measuring and bending rebar.

6.1 Hand, finger and foot injuries.

D 3 MED

6.1.1

6.1.2

6.1.3

6.1.4

6.1.5

Install stops on the edge of workbench.Approved hand gloves, available in a full range of sizes to ensure proper fit to maintain dexterity.Follow manufacturers recommendations for operating and adjusting machine for rebar size.Competent and properly trained operator.Keep away hand & finger from moving parts.

6.1.1.1

6.1.1.2

6.1.1.3

6.1.1.4

6.1.1.5

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Ensure that equipment manual is available near the machine.Post names of authorized operators near the machine.Minimum 3 persons-Team leader with 2 helpers.Post the rebar bending machine safe operating procedures and safety precautions at the job site.

B 2 LOW

6.2 Dropped rebar from height. D 2 MED

6.2.1

6.2.2

Install appropriate stops on the edge of workbench.Ensure adequate number of workers to control the operation.

6.2.1.1 Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.

B 2 LOW

6.3 Unauthorized people in rebar bending area or radius.

B 2 LOW6.3.1 Barricade and secure area and post

safety sign boards Authorized Employees Only.

B 1 LOW

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6.4 Improper use of rebar bending machine.

B 3 LOW

6.4.1

6.4.2

6.4.3

Competent and properly trained operator.Follow manufacturers recommendations for operating and adjusting machine for rebar size.Post near machine the manufacturers safe operating procedures in the appropriate languages

6.4.1.1

6.4.2.1

6.4.3.1

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Ensure that equipment manual is available near the machine.Post names of authorized operators near the machine.

B 1 LOW

7.1 Use of tie-wire causing hand, face or eye injury.

C 3 MED

7.1.17.1.2

7.1.37.1.4

Use proper tie wire techniques.Wear approved PPE, safety glasses, safety helmet and safety foot wear.Appropriate hand tools.Appropriate hand gloves.

7.1.1.1

7.1.1.2

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Ensure that workers carrying the task is properly trained and competent.

B 2 LOW

7.2 Dropped or collapse of bar structure or stand.

C 2 LOW

7.2.1

7.2.2

Use approved stands to support rebar load.Visually inspect daily support stands.

7.2.1.1

7.2.1.2

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Ensure that workers performing the task is properly trained and competent.

B 1 LOW

8.1.1

8.1.2

Ensure that guards are kept in place and not removed.Do not wear loose clothing or jewelry. Long hair shall be pulled back and kept from dangling.

8.1.3 PPE ( hearing protection as appropriate).

8.2 Electrocution and burns.

B 2 LOW

8.2.1

8.2.28.2.3

GFCI and using the correct operating voltage.Competent personnel.Equipment inspections performed by competent personnel and has valid inspection sticker with color coding.

B 1 LOW

LOWLOW B 1

7 Assembly of reinforcement bars.

8 Surface preparation for construction joints.

8.1 Use of hand held power tool, grinding buffing and air compressor.

B 2

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8.3 Sub-standard equipment.

B 5 MED

8.3.1

8.3.2

Distribution panel inspected by Contractor before being energized.Inspection and color-coding of power tools monthly with a visual inspection prior to each use.

8.3.1.1 Ensure all sub-standard equipment should be remove from site and tag as unsafe. B 2 LOW

9.1 Use of hand and power tools.

B 3 LOW

9.1.1 All work is to be completed with approved PPE, including safety glasses with side shields, safety helmet, coveralls and steel toe footwear and gloves.

9.1.1.1

9.1.1.2

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Post the table saw and combination saw machine safe operating procedures and safety precautions at the job site.

B 1 LOW

9.2 Handling shutters (Back injury).

B 3 LOW

9.2.1

9.2.2

9.2.39.2.49.2.5

Provision for lifting aids when practical.Break the load into manageable portions.Lift with your legs not your back.Use the buddy system, Get help.Provide pictorial sign boards with correct lifting position.


9.3 Debris and materials causing slip, trips and falls. B 2 LOW

9.3.19.3.2

9.3.3

Adequate stacking of materials.Regular housekeeping practices and removal of trash and unnecessary items.Maintain access and walk paths.

B 1 LOW

9.4 Fall hazards.

B 3 LOW

9.4.1

9.4.2

Use approved ladder i.e. scaffold material to gain height advantage.Work from ground level or use approved platform.

9.4.1.1 Ensure that all employees working at height are properly trained.

B 1 LOW

10 Install rebar re-enforcement steel into form works with gantry crane.

10.1 Falling or dropped loads.

C 5 HIGH

10.1.110.1.210.1.310.1.4

10.1.5

Third party crane inspections.Daily crane checks.Competent riggers.Quarterly and Daily inspection of rigging gear and equipment (color coding).Third party crane operator.

10.1.1.1

10.1.1.2

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Ensure the area is properly barricaded and secured.

B 2 LOW

9 Install formworks.

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10.2 Improper rigging.

C 5 HIGH

10.2.110.2.2

10.2.3

Competency check for all riggers.Rigging supervisor to monitor rigger performance.Third party certified and competent riggers.

10.2.1.1

10.2.1.2

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Rigging operations shall be performed by competent and qualified riggers.

B 3 LOW

10.3 Damaged, worn or unusable rigging equipment.

C 5 HIGH

10.3.1

10.3.2

10.3.3

Quarterly inspection of lifting gear by Third party and color coded.Removal and isolation of all worn or damaged lifting equipment.Rigging gears shall be color coded as per project procedure.

10.3.1.1

10.3.1.2

Supervisor/foreman shall ensure that the TSTI is properly executed at the work front and hazards discussed.Ensure that all rigging gears are has 3rd party certificates.

B 3 LOW

10.4 People struck by suspended or swinging load. B 5 MED

10.4.1

10.4.210.4.310.4.4

Barricade and secured area and install safety sign boards.Use tag lines to control load."DO NOT" lift load over people.Do not allow people to walk under the load.


11.1 Fall hazards.

B 3 LOW

11.1.1

11.1.2

Use approved ladder i.e. scaffold material to gain height advantage.Work from ground level or use approved platform.

11.1.1.2 Ensure that all employees working at height are properly trained. B 2 LOW

11.2 Use of hand held power tools, vibrator.

B 3 LOW

11.2.1 All work is to be completed with approved PPE, including safety glasses with side shields, safety helmet, coveralls and steel toe footwear and gloves.

11.2.1.1 Ensure that all employees are properly trained to use the assigned tools. B 2 LOW

11.3 Electrocution and burns.

B 2 LOW

11.3.1

11.3.211.3.3

11.3.4

GFCI and using the correct operating voltage.Competent personnel.Dont touch electrically live parts with skin or wet clothing. Ensure good electrical connection.

B 1 LOW

11 Pour concrete.

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11.4 Sub-standard equipment.

B 5 MED

11.4.1

11.4.2

Distribution panel inspected by Contractor before being energized.Inspection and color-coding of power tools monthly with a visual inspection prior to each use.

11.4.1.1 Ensure all sub-standard equipment is removed from site and tagged as unsafe. B 2 LOW

11.5 Concrete pump truck boom malfunctioning.

B 5 MED

11.5.111.5.2

11.5.3

11.5.4

11.5.5

Contractor inspections.Daily operator inspection of vehicle and associate pump equipment.Competent operator trained on the equipment in which he operates.Visual inspection of boom prior to each use.Ensure whip check is nstalled.


11.6.1 Approved PPE( including face shield by employees working is close proximity of concrete pour).

11.6.211.6.3

Competent personnel.Eye wash available.

11.7 Skin injury.C 1 LOW

11.7.1 Wearing of approved coveralls and gloves, with the hose man wearing additional non-permeable suit.

B 1 LOW

11.7 Foot injury. C 1 LOW 11.7.1 Appropriate footwear B 1 LOW

11.8.1 Use of plastic, spread on the ground to contain waste.

11.8.2 Operator to properly control pump boom movement.

11.8.3 Workout set approved area.

LOWLOW1C B 1

11.6 Concrete splash. (Eye injury).

11.8 Concrete waste.

B 2 LOW B 1 LOW

MS for Mass Concrete Works 18.08.08.pdf009 Concrete Works Rev.O JSA X 1.pdfCover

013-MS for Mass Concrete Works.pdfJSA-Mass Concrete Works.pdfCover