Experimental Study On Microstructure Of Recycled High Performance Concrete Affected By Intensified Test

With the development of social economy and the improvement of people’s environmental protection consciousness, the consensus of the sustainable development path increase gradually in the world. The high cost and high pollution of construction for a long time, also gradually be valued. For this reason, recycled concrete arises at the historic moment. At present, the analysis of recycled concrete has had greater progress at home and broad, but there are still many defects. Therefore, this paper mainly takes intensified test research,and study on the microstructure property and basic mechanical properties of the intensified Recycled high-performance concrete.1. The intensified test research on recycled aggregate are carried out by means of different chemical paste liquid. The tests study the basic properties of intensified recycled aggregate and the test results show that intensified means can improve the basic basic properties of recycled aggregate in a certain extent.2. By research on basic mechanical properties of recycled high performance concrete, this paper also analyses the influence of different intensified means to the basic mechanical properties of recycled recycled high performance concrete as reference, and compared with normal high-performance concrete and normal recycled high-performance concrete. The test results show that using the liguid mixture of cement and silicon powder and the liquid of polyvinyl alcohol (PVA) to imerse recycled aggregates can improve the strength of the recycled high-performance concrete effectively.3. The influence different intensified means have on the microstructure of recycled high-performance concrete was analyzed by means of scanning electron microscopy (SEM) experiment, and the microstructure of recycled high-performance concrete was compared with those of normal high-performance concrete and normal recycled high-performance concrete. The results of the test show that the method using cement slurry turned out to be an inconspicuous approach to improve the Interface Transition Zone (ITZ) of recycled high-performance concrete, while the one using liquid mixture of cement and silicon powder indicated apparent improvement on the Interface Transition Zone (ITZ) of recycled high-performance concrete at early age, and when the liquid of polyvinyl alcohol (PVA) was used to immerse recycled aggregates, it could be found that the Interface Transition Zone (ITZ) of recycled high-performance concrete was improved relatively apparently after 7 days.4. Through the above test results show that the liquid mixture of cement and silicon powder with the water ratio of 1.0 and the liquid of polyvinyl alcohol with the concentration of 10% can improve the strength and the Interface Transition Zone (ITZ) of recycled high-performance concrete.Therefore,the two intensified means will be important methods to realize high-strength for the recycled aggregate concrete.