New technical specifications have been released by Austroads. The specifications cover the requirements for supply of sealant and the sealing of cracks in asphalt and spray seal pavements using hot placed elastomeric and crumb rubber sealants.
The new specifications prevent water from seeping into the pavement material.
Ross Guppy, Austroads Program Manager said Austroads Technical Specification ATS 3470 includes information on quality system requirements, materials, pavement surface preparation, application of sealant, performance requirements and records.
“It’s part of the comprehensive suite of specifications Austroads is producing for road and bridge construction. These standardised specifications will save time and money in the long term as industry adopts consistent contemporary practice on construction projects.”
The specification is provided with six new test methods that give detailed instructions on the following aspects;
- preparing hot poured joint sealant for testing (AGPT–280-20)
- flow properties of hot poured joint sealant (AGPT–281-20)
- tensile bond strength test for hot poured joint sealant (AGPT–282-20)
- heat degradation of hot poured joint sealant (AGPT–283-20)
- penetration into hot poured joint sealant (AGPT–284-20)
- an extension test for hot poured joint sealant (AGPT–285-20)
Richard Edwards, author of the specifications, said these test methods provide precise information on safety precautions, equipment, preparation, procedures and reporting.
“They are derived from existing Transport for NSW test methods which in turn are sometimes derived from American Society for Testing Materials Designations.”
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