Effect of vibration mixing on the performance of cement-stabilized recycled aggregates
To investigate the application of recycled coarse aggregates in cement-stabilized recycled aggregate and enhance the mechanical properties of cement-stabilized recycled aggregates,the construction waste generated from bridge demolition was crushed to prepare recycled coarse aggregates.By optimizing the grading of cement-stabilized recycled aggregates through proportioning with natural fine aggregates,an improved mixture was developed,and the effects of vibration mixing and cement dosage on the performance of the cement-stabilized recycled aggregates were explored.This study found that the optimal mixing parameters were vibration time of 30 s and vibration frequency of 40 Hz.Vibration mixing could improve the drying shrinkage and thermal shrinkage performance of the cement-stabilized recycled aggregates,enhance their mechanical properties,and increase their capacity to withstand traffic loads.For instance,with a cement dosage of 5%,the 7 d compressive strength of the vibration mixed cement-stabilized recycled aggregates reached 4.2 MPa,meeting the strength requirements for the base layer of heavy-traffic highways in China.Simultaneously,an increase in cement dosage further benefited the mechanical properties but adversely affected the drying and thermal shrinkage performance.
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