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7. Sustainability - Questions & Responses AAPA 2011 Study Tour Group ReportTexture depth as described in the review of the performance of UTFC in South AfricaThe performance of UTFC in South Africa was reported to CAPSA “Critical review of performanceof UTFC in South Africa – Corne Roux, Dennis Rossmann, Louw Kannemeyer”. Key findings were:• Performance of UTFC on structurally sound pavements was proven, with raveling as theeventual terminal distress mode.• Successfully used as a rut filler in combination with the surfacing layer.• Improvements in riding quality attained.• No marked decrease in macro surface texture, average in-service values 1.1 to 1.5 (Fig 1)• Was not the ideal product for use in “holding actions” on cracked pavements or pavementswith poor support.• Performance as a waterproofing layer was dependent on adequate tack coat application.V4-2 Page 106
7. Sustainability - Questions & Responses AAPA 2011 Study Tour Group ReportWARM MIX ASPHALTWarm Mix Asphalt trials and temperature profile of the WMA mat during compactionSouth Africa embarked on a structured evaluation of Warm Mix Asphalt technologies spearheadedthrough the eThekwini Municipality with support from Sabita, it’s members and the staff ofSANRAL. The findings have been captured in a newly released guideline document the SabitaManual 32: Best practice guideline for warm mix asphalt.This document was not available for inclusion in this report which references is a copy of the draftversion of the manual . The guideline includes chapters on:1) Introduction to WMA, 2) Frequently asked questions, 3) Benefits of Warm Mix Asphalt,4) Overview of WMA Technologies, 5) Classification of Warm Mix Technologies, 6) Considerationsregarding health, safety & the environment, 7) Handling and mix components, 8) Qualityassurance of mix components, 9) The mix approval process, 10) Manufacture, 11) Qualityassurance in the manufacturing process, 12) Construction, 13) Quality assurance at the paving site,14) Protocol for introducing a new WMA technology.It also includes an annexure “Interim specification for Warm Mix Asphalt base &surfacing” which isframed to match the SANRAL supported COLTO Specification series. A copy of the guideline willbe available from the Sabita website (www.sabita.co.za).Question (#9, 10, 11, 12)Q9. Is warm mix asphalt and low energy asphalt being routinely used? What implementationstrategy was used to introduce and evaluate the WMA performance?Not routinely used, so far about 15 000 tonnes have been placed under trialing conditionsundertaken over three years under industry and road authority supported project in eThekwinin /Durban area. Outcomes reflected in the Sabita Manual 32: Best practice guideline for warm mixasphalt.The CAPSA’11 conference paper “Warm mix asphalt – the South African experience – KrishnaNaidoo” covers the testing strategy leading to the wide acceptance of WMA. Three trials wereheld from 2008 to late 2010 encompassing RA in 10%, 20%, 30% and 40%, polymer modifiedbinders, four different WMA technologies and 10 surfacing & 8 base mixes.Presentation “Discussions with Australian Delegation – Progress with WMA – Tony Lewis”V4-2 Page 107
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1. Executive Summary AAPA 2011 Stud
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