Specialist Consultants in -Concrete Technology -Structure Condition Assessment -Building Repair Management -Materials Testing -Product Development Since 1978

MAHAFFEY ASSOCIATES PTY LTD (ABN 90 001 629 036) Incorporating BEMAC Laboratories Unit 9/108-110 Percival Rd (PO Box 2162) Smithfield NSW 2164 Ph (02) 9756 4003 Fax (02) 9757 4228 Email mahaffey@mahaffey.com.au DRM/L02R/10246 21 January 2019 Peds Industrial Pty Ltd 31 Polaris Ave CAMERON PARK NSW 2285 Attention : Mr Jerremy Allbut Dear Sir, Re : PEDS Industrial Reinforcement Spacers RTA B80 Compliance We have now completed testing of concrete used in pacer blocks supplied by PEDS Industrial. The purpose of this testing was as follows. To allow the concrete used in the spacer blocks to be assessed for compliance with RTA bridge specification B80. 1. Introduction B80 requires that the concrete used in the manufacture of the spacer blocks meets the requirements of the specification for concrete used in the work. The requirements are as follows.

Strength/water cement ratio Durability performance (chloride ion migration) Soluble salts (chloride and sulphate) Drying shrinkage testing has not been carried out on the Peds Industrial concrete. This was done on the basis that the spacer blocks are small and the magnitude of any drying shrinkage

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would be insignificant. Further, the spacer blocks are cast off site and will be a minimum of 28 days old by the time they are used in concrete pours. On this basis, the concrete in the spacer blocks will have undergone the bulk of its total drying shrinkage by the time the spacers are used. Sorptivity testing is nominated in B80 under some circumstances. The purpose of sorptivity testing is to determine the effectiveness of curing that does not meet one of the deemed to comply methods in B80/E. In this case, the concrete supplied to us was water cured and so sorptivity testing was not required. However, for the sake of completeness, sorptivity testing has been carried out. Durability performance was assessed using chloride diffusion and chloride migration testing. 2. Test Program Samples for testing were supplied by PEDS Industrial Pty Ltd. Two types of samples were supplied, as follows. Concrete cylinders understood to have been made from the concrete used in the manufacture of the spacer blocks. These were used for strength testing as well as chloride diffusion and chloride migration testing. Concrete beams understood to have been made from the concrete used in the manufacture of the spacer blocks. These were used for sorptivity testing. Samples were tested in accordance with the following methods. Compressive Strength - AS1012.8 Concrete cylinder samples were tested in compression. Chloride and sulphate content – AS1012.20 Concrete cylinders were tested to determine chloride and sulphate content Chloride migration – Nordtest NT Build 492 Concrete cylinders were tested to determine the chloride migration

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value. Chloride migration – Nordtest NT Build 443 Concrete cylinders were tested to determine the chloride diffusion value. Sorptivity – RMS T362 - Beam samples, cured in the same manner as the spacer blocks, were used to determine sorptivity. 3. Results The results of the testing are shown in the laboratory test reports in Appendix A. These results are summarized in Table 1, below. TABLE 1 – Summary of Test Results Sample Test Age Mean Result Cylinder Compressive Strength MPa 100 Cylinder Chloride content Kg/m3 0.096 Cylinder Sulphate content % of cement 2.5 Cylinder Chloride Migration m2/s x10-12 0.16 Cylinder Chloride Diffusion m2/s x10-12 0.58 Beam Sorptivity mm 0.7 4. RTA B80 Compliance The test program carried out on this trial mix has demonstrated that the concrete spacers supplied by Peds Industrial comply with the requirements of B80 for Exposure classification C.

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This is on the following basis. The deemed to comply provisions of B80 for water cured concrete in exposure classification C are nominated in Table B80/E.1. The compressive strength exceeds 60MPa as nominated in Table B80.6. The water cement ratio of the concrete is no known, however, a compressive strength of 100MPa means that the water cement ratio will be well below the specified maximum of 0.4. Table B80.6 nominates an upper limit of 4.0x10-12m2/s when chloride migration is measured using the method in Nortdets NT Build 492. The result was 0.16, which is well within the specified limit. Table B80.6 nominates an upper limit of 2.5x10-12m2/s when chloride migration is measured using the method in Nortdets NT Build 443. The result was 0.58, which is well within the specified limit. Table B80.7 nominates a sorptivity upper limit of 8mm for concrete for use in Exposure Classification C. The measured value of 0.7mm is well below this limit. Chloride and sulphate levels were well below the specified limits. The maximum allowable chloride content for Exposure Classification C is 0.3kg/m3 (Table B80/5) and the measured chloride content is less than 0.1. The upper limit on sulphate content is 3% and the measured sulphate content is 2.5%

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Yours faithfully, MAHAFFEY ASSOCIATES PTY LTD D. R. Mahaffey 5. Conclusion Based on the testing reported herein, the Peds Industrial concrete complies with the durability requirements of B80 for Exposure Classification C.

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APPENDIX A Laboratory Test Reports

10246Client :Supplier :Project : Signed :COMPRESSIVE STRENGTH OF CONCRETE CYLINDERSDate : 22/05/18 - 29/06/2018 -Plant : - Mix : -- - - Compact'n: -Average Diameter Height1 100.0 199 38 20 S 19/07/2018 58 71.0 2400 02 99.8 201 38 20 S 19/07/2018 58 104.5 2400 03 99.8 201 38 20 S 19/07/2018 58 102.5 2400 0Notes Comments1. Sampling and casting by others2. Curing by others carried out prior to samples being received3. Standard Curing carried out in this laboratory to AS1012.8.1 Clause 9.3(a)4. Capping - R=Rubber, S=Sulphur5. Compressive Strength to AS1012.96. Moisture Condition SSD unless stated otherwise7. Mass per Unit Volume tested in accordance with AS1012.12.1. Results quoted to the nearest 20kgm-3Concrete Reinforcement Spacer Blocks - Compliance Testing-Peds Industrial Pty Ltd000 Std Curing (days) Type of Cap Date of Test Age (Days)Agg Size (mm) : Curing by Others (Days) Measured Slump (mm):CONCRETE TEST REPORT Report No: July 2018Specimen Identif Dimensions (mm) David Mahaffey

0Approved SignatoryRemarksStrength (MPa)Strength Grade :Mould :-Time ex plant : Date Received : Mass/Unit Volume (kg/m 3 )Target Slump (mm): 0

The results of the tests, and/or measurements includedin this document are traceable to Australian standards. Accredited for compliance with ISO/IEC 17025 - Testing

This document may not be reproduced except in full Page 1 of 1

Client: Peds Industrial Pty LtdJob Number: 10246Details: Concrete Reinforcment Spacer BlocksTest Type: Chloride Content (by Mohr's method - selective ion electrode)Test Method: AS1012.20Cast Date:Received Date:Test Date: From To- - 0.004- - 0.003- - 0.004- - 0.004- - 0.004Notes: Signed:11/12/201829/06/2018 Test ReportNil Cl - (% w/w Specimen)Depth (mm)Specimen Identity722/05/2018 Approved SignatoryDavid MahaffeyThis document shall not be reproduced except in full Page 1 of 1 PEDS (RC) - Chloride + Sulphate B80 QUINTUPLICATE - Dec 2018

Client: Peds Industrial Pty LtdJob Number: 10246Details: Concrete Reinforcment Spacer BlocksTest Type: Sulfate Content (Turbidimetric by barium chloride precipitate)Test Method: AS1012.20Cast Date:Received Date:Test Date: From To7 - - 0.473Notes: Signed:11/12/201829/06/2018 Test Report SO 3 = (% w/w Specimen)22/05/2018 Approved SignatoryDavid MahaffeySpecimen IdentityNil Depth (mm)This document shall not be reproduced except in full Page 1 of 1

Client: Peds Industrial Pty LtdJob Number : 10246Project: Concrete Reinforcement Spacer BlocksSite: -Material: -Manufacturer: -Sampled By: ClientMix Code: -Mix/Specimen ID: 7 8 9Curing By: OthersCast Date: 22/05/2018Received Date: 29/06/2018Test Date: 19/07/2018Test Age (Days): 58Test Type: Non-Steady-State Chloride Ion Migration CoeficientTest Method: Nordtest NT Build 492 7 8 9 Mean Value100 100 10049 49 496 4 360 60 6013 8 714 9 825 25 2524 24 2425 25 2596.0 96.0 96.0d 1 5 4 2d 2 5 6 3d 3 4 3 3d 4 6 2 4d 5 0 2 3d 6 0 4 4d 7 4 4 2Average 3 4 3Notes: 00Specimen Diameter (mm):Specimen Thickness (mm):Final Temperature ( O C):Initial Temperature ( O C):Average Temperature ( O C):Initial Current (mA): Final Current (mA): 0.16Applied Voltage (V):This document shall not be reproduced except in full

Specimen IDApproved SignatoryDavid MahaffeyTest Duration (Hr): 0.17 0.150.18Migration Coeficient (x10 -12 m 2 sec -1 ): Penetration Depth (mm): -Initial Current at 30 V (mA):Test Parameter

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Client: Peds Industrial Pty Ltd Job Number: 10246Test Method: NT BUILD 443Project: Compliance TestingSupplier: - Age when placed in Brine (Days): 58Sampling Method: - Duration in Brine (Days): 35Cast Date: 22/05/2018Test Date (Completed): 10/09/2018Concrete Type: - Number of Specimen: 1Specimen ID: Combined Mix Code: 4 5 6Purpose of the Test: Determination of Coefficient of Chloride Diffusion Mix ID: -Sample Interval A B CFrom (mm) 4 5 60 to 1 0.5 0.899 0.966 0.6741 to 2 1.5 0.300 0.308 0.3152 to 3 2.5 0.109 0.117 0.1223 to 4 3.5 0.058 0.052 0.0684 to 5 4.5 0.029 0.023 0.0335 to 7 6.0 0.013 0.012 0.0119 to 11 10.0 0.006 0.007 0.00613 to 15 14.0 0.003 0.005 0.004Initial Chloride content 0.003Chloride Diffusion Coefficient (De) x 10-12 m2/s4 5 6 Mean0.56 0.54 0.63 0.58Surface Chloride (Cs) % Cl w/w concrete4 5 6 Mean0.71 0.74 0.70 0.72This Document shall not be reproduced except in full Signed: David MahaffeyApproved SignatoryDepth Below Exposed Surface (mm) Measured Chloride (% Cl w/w concrete)Client Address: 74 Skypoint Rd Cole Point NSW 2883 Conditioning in Lab prior to testing: SaturatedPerson Responsible for Sampling: Client

0.000.050.100.150.200.250.300.35 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0Chloride Concentration (% Cl w/w concrete) Depth below exposed surface (mm) A Measured ValuesB Measured ValuesC Measured ValuesA Predicted ValuesB Predicted ValuesC Predicted Values

Client: Peds Industrial Pty Ltd Job Number: 10246Project: Concrete Reinforcement Spacer Blocks Cast Date: 22-May-18Test Type: Sorptivity Received Date: 29-Jun-18Test Method: RMS T362 Exposure Category CMix ID: 10 11 12 Curing Regime: WaterTest Date (Completed): 07-Aug-18Beam Number Curing Regime Curing Period (Days) Average Water Penetration (mm)10 Water 0 2.011 Water 0 0.012 Water 0 0.00.7Notes: Values quoted as 0.5mm are at the lower limit of easurement and the actual value may be less than 0.5mmCuring period noted above refers to the duration of curing at the laboratroy Average of Mix Approved SignatoryDavid Mahaffey