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History of TRH12. Road rehabilitation research work started circa 1980TRH12 appear in 19831st revision in 1990/12nd revision 1997 (minor alterations)3rd revision 2005/6. Third revision . Need identified during 2003 Obtained comments from individualsWorkshops SANRAL committed funds Establish
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1. 3rd REVISION OF TRH12 Renaldo Lorio 12th Meeting of RPF - 8 November 2006