The Michigan Department of Transportation (MDOT) has successfully used recycled crushed concrete as a base layer in highway pavements for several decades. Using recycled aggregate decreases demand for new materials, reduces MDOT’s highway costs and promotes sustainability. However, MDOT had observed that some drainage water from roads with a recycled concrete base layer was very alkaline and created mineral deposits at drain outlets. Researchers investigated this issue and recommended treatments that will allow MDOT to continue using recycled materials while easing environmental concerns about roadway drainage.
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The use of recycled materials for subgrade stabilization can provide the support needed for construction vehicle loading and more typical long-term traffic loading. This is a particular need in Michigan due to the prevalence of weak subgrade soils. Using recycled byproducts from manufacturing processes for soil stabilization reduces the impact on landfills and also reduces the cost of strengthening the soil prior to constructing the upper pavement layers.
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