Case Study

Insulating, Heavy-Duty Road Base

Insulating, Heavy-Duty Road Base

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Brentwood Light Rail Transit (LRT) Bus-Lane Calgary, Alberta, Canada Problem: Transit buses exert heavy loading due to the single rear axle. A bus-lane with traffic volumes of up to 100 buses per hour had frost-heaved substantially and became virtually impassable. The sub-base of the road was saturated silty deposits, over 30 m in depth. The subgrade soil had a California Bearing Ratio (CBR) of 0.8%. Solution: In 2000, the road was completel

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