Chipseal Design - *ON LINE ZOOM*

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NZIHT is offering clients an opportunity to attend this course on-line.  

Factors affecting the design and the field performance of chipseal surfacings are complex. Local conditions can significantly influence the way a seal is designed to get the best performance. 

Prior detailed knowledge of chipsealing materials is an essential requirement for this course. A short preparatory course “Chipseal Materials” is available for those who wish to update their knowledge.

The treatment selection and design procedures from the textbook "Chipsealing in New Zealand" provide the basis for this course and a range of worked examples are included. A problem-solving session in syndicate workgroups also aids understanding. 

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2 day course.

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Barry Gundersen

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$550 per person + GST to attend all four 2 hour zoom sessions

(Minimum numbers apply before a course is confirmed)

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Topics include

24 June 2020 - Day 1:

9.30am - 11.30am: Introduction, pavement stresses, skid resistance, reasons for resealing,surfacing problems

1.30pm - 3.30pm: Seal types, selection, design theory, spray rates

25 June 2020 - Day 2:

9.30am - 11.30am: 2-coat design, texturising, void fills, 1st worked example,  3rd worked example with time for individual solution or syndicates if possible

1.30pm - 3.30pm: 4th worked example, with time for individual solution or syndicates if possible, alternative treatments, problem-solving, PMB practicalities, repairing flushing, layer instability, chip-loss causes.

All four sessions are compulsory.


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On completion of this course participants will

  • Assess chipsealing needs
  • Understand and undertake design steps required
  • Determine pretreatments required
  • Determine appropriate surfacing treatments and binder application rates
  • Calculate hot binder spray rates and chip application rates
  • Identify essential spray preparation/spraying control, traffic control/compaction checks to ensure quality of seal
  • Select plant for production requirements and job type
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Who should attend

People with limited knowledge of chipseal design and experienced practitioners wishing to update their knowledge in line with the new approach in the "Chipsealing in New Zealand" textbook.  Personnel from Local Authorities, contractors and consultants will find this course particularly useful.

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Presenter information

Presenter Profile: Barry Gundersen has over 38 years engineering and management experience in the road surfacing industry on both sides of the Tasman. He was National Technical Manager for Bitumix (NZ) for 15 years before setting up his own consultancy in 1995, specialising in road surfacings. Barry has been a visiting lecturer at Auckland University for 12 years and also runs training courses for the Australian Asphalt Pavement Association.

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Entry Recommendations

  • To fully understand and successfully complete this course, attendees must already have a sound knowledge of the nature and properties of road surfacing component materials. Participants can gain this essential knowledge by first attending the NZIHT preparatory course Chipseal Materials, as knowledge of this subject matter will be assumed.
  • It is recommended that attendees should also attend or have completed the Bitumen - Basic Safety course within the last five (5) years.
  • For maximum benefit it is recommended that participants have the mathematical ability of at least NCEA Level 1
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  • Each attendee must have a suitable device with camera, audio and internet connection to enable these zoom meetings.
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