Abstract: The recycled aggregates are generated from the old pavement structure removal throughout the sieving and selection process. To study the effect of water glass on the improvement results of the recycled aggregates, the results of the unconfined compressive strength of the improved aggregates with various water glass contents was selected as the index. The water glass additives are the weight of the aggregate of 0.04%, 0.06%, 0.08%, 0.1% and 0.12% with the curing ages of 7 days and 28 days, respectively. The test results indicate that, the strength of the recycled aggregate can be improved by the addition of the water glass. The stress-strain relationship meets the strain soften curve; the optimum water glass content is 0.08%.  

Key words: Water Glass, Recycled Aggregates, Unconfined Compressive Strength