Long-term performance of an industrial by-product based binder mixture in a base course stabilization

Base course stabilization is usually carried out in Finland by using the existing road structures as a raw material. In this application the existing asphalt pavement is first milled and mixed with the road base course... [ view full abstract ]

Base course stabilization is usually carried out in Finland by using the existing road structures as a raw material. In this application the existing asphalt pavement is first milled and mixed with the road base course material. With this technique the bearing capacity of the existing road structure can be improved without increasing the thickness of the road pavement structure.

In this study, the long-term performance of an industrial by-product based hydraulic binder mixture bound base course is evaluated by examining five different experimental asphalt paved roads, age from 7 to 13 years. Industrial by-products used in the binder mixture were biomass fly-ash (BFA), gypsum waste (GW) and blast furnace cement (BFC/CEM III). Research methods in the study were visual condition survey, condition examination and structure sampling by drilling. Condition examination study was done by analyzing the data from road surface measurements and falling weight deflectometer (FWD) tests. Measured variables were pavement rutting, international roughness index (IRI) and bearing capacity. Unconfined compression strength was tested from the structure samples. Visual condition survey results were analyzed to study the rate of pavement damage.