Mechanical and Durability Characteristics of Recycled Brick-Concrete Materials and Their Application in Airport Pavement Cushion

Abstract:

This paper designed a skeleton dense recycled brick-concrete materials（RBCM） using recycled brick-concrete materials. The mechanical characteristics of RBCM under compressive， tensile， and penetration stresses were synthesized by various tests. Considering the actual working conditions， two types of durability environments， i.e.， the specimen cycle and the particle cycle， were designed， and the durability evolution of RBCM was quantified by an unconfined compressive strength test. The engineering application performance of the RBCM cushion was verified based on the field test section. The results show that the permeability of the RBCM cushion is poor， and it is appropriate to pave a permeable cushion on the upper part of RBCM cushion. The increase in cement content significantly improves the compressive strength and failure mode of RBCM， the compressive strength and penetration strength are higher， but the tensile strength is lower. The durability coefficient of RBCM after 30 cycles is still more than 50% after adding a little cement. Even without cement， the compactness and mechanical properties of the RBCM cushion still meet the requirements of the current cushion design index.

Key words:airport reconstruction and expansion projects;skeleton dense type;recycled brick-concrete materials;cushion layer;durability performance