Experimental Study On Pile Strength Of Recycled Concrete Pile

With the progress of the urbanization, a huge amount of natural aggregate resources are consumed and more and more building rubbish is produced, which poses a grave threat to the social environment. The research and development of recycled concrete technology can be a good solution to the growing shortage of construction aggregate and environmental pollution caused by building rubbish. Therefore, the performance of recycled concrete is studied in this paper.The study focuses on the basic properties of recycled aggregate, making a comparison between recycled aggregate and natural aggregate in particle shape, grain composition, apparent density, bulk density, porosity and water absorption, and analyzes the reasons of differences.An orthogonal test is designed to study the effects of the replace rates of recycled aggregate, and the replace rates of tailing sand and the strength of the original concrete specimens on the compressive strength of recycled aggregate concrete. After that, the author studies the influences of recycled coarse aggregate size on the recycled concrete. The experiment shows that five consecutive graded aggregate completely replace the recycled concrete aggregate using the natural aggregate, its strength is the largest when the size of coarse aggregate particle is 5~25 mm.The experiment uses the recycled concrete to make model piles and the static load test of recycled concrete pile composite foundation is conducted. The regularity of settlement of recycled concrete pile composite foundation, the distribution of axial force of piles and the change regulation of pile-soil stress ratio are studied. Then, compared with the performance of ordinary CFG pile composite foundation, the result finds that the change regulation of these three performances of recycled concrete pile and CFG pile composite foundation are basically same.