Application Of Waste Clay Brick In Cement Concrete Pavement

With the development of Chinese industrialization and urbanization, the construction of new buildings brings a lot of old building demolition, which resulting in a large number of construction waste. A lot of lands are occupied by the clay bricks,which were the most widely used building materials in the middle of last century. After the clay bricks milled,it has some pozzolanic activities. To some extend,the doped synthetic material, which is made of the brick powder, can make use of this kind of rubbish. However, it is necessary toimplement the large scale usage of clay brick in concrete pavement, to find the active method to improve the activity of clay brick, and to improve the performance of concrete pavement by taking its advantages. In this paper, the waste clay brick powder, fly ash, and slag powder were used with appropriate proportions to configure a new composite powder body material. This material can effectively improve the performance of concrete flexural strengthand concrete pavement.The result showed that the grinding energy consumption of waste brick is only 5% of cement clinker. This means that the powder material of the traditional cementitious material can be partly replaced by the ultra-fine grinding brick, which is economical and feasible. The activity index of the brick powder was 64.8%, containing the active silica 10.18%, and the activity of the activity two was three aluminum 4.73%. The brick powder and fly ash, slag powder complex with a ratio of 1:1:2. Then we doped composite powder material. In common C30, C35 two grades of concrete test,we replaced with 30% cement. The concrete compressive strength meets the requirement specification after mixing the material. The flexural strength, impermeability and frost resistance of the concrete increased and showed good durability. The fineness of the brick powder and the product of the hydration of the brick powder in the system played a decisive role in the improvement of the pavement performance.The composite material is cost effective. It will be applied to the construction waste reuse process and bring the society and economy benefit.