Winnipeg’s Public Works department has asked MHCA to circulate to the industry the guidelines for sampling and CBR testing of base and sub-base materials this construction season.
The MHCA and associated industry groups are continuing to work with the City administration on the new CW3110-R21 specifications for road base and sub-base. In particular, the Specification Working Group is facing challenges relatds to the use of recycled concrete aggregates.
A number of industry contractors are cooperating with University of Manitoba engineering professor Dr. Amed Shalaby, who is undertaking technical studies of recycled concrete aggregates now in use to determine their physical properties and characteristics.
“We are very concerned about the potential for using RCA in the coming construction season,” MHCA Chris Lorenc said. “We continue to press the case that recycled concrete aggregate is a worthwhile sub-base material for roads, and to eliminate their use from city projects would mean consigning hundreds of thousands of tonnes of recyclable material to the landfill.”
The industry is in the process of responding to the administration’s latest version of the proposed specifications.