Use of Cement for Upgrading Low Quality Aggregates in Ohio for Bituminous Concrete Mixtures. A Feasibility Study. Phase 1

摘要

The overall scope of the study was to evaluate the use of Portland cement for upgrading low quality aggregate encountered locally in Ohio. The primary targets of the investigation were to determine the optimum cement to be used in the form of an admixture or optimum cement and water-cement ratio for coating aggregates, optimization of mix parameters, reliability of performance evaluation, and the prediction of pavement performance compared to conventional bituminous concrete mixtures. The test results indicated that cement coating of coarse aggregate fractions for use in bituminous concrete mixtures is possible, and it has a significant effect on improvement of material properties. It was further reported that cement slurry treated aggregates have generally exhibited better material properties at both compactive efforts as opposed to the other treatments and virgin mix.