Study On Mechanical Properties Of Recycled Aggregate Concrete With Fly Ash

With the continuous development of water conservancy construction industry, a large number of concrete used in the engineering industry. At the time of the demolition of hydraulic structures, the recycling and reuse of waste concrete has become a green environmental protection construction waste disposal way all over the world. In order to make a contribution in this field, this paper studies the recycled concrete with different water cement ratio and different replacement ratio of recycled concrete, different curing times, cement fly ash content and different recycled aggregate concrete strength matrix of recycled concrete compressive strength and splitting tensile strength impact.Firstly, according to previous research results, analyzed the characteristics of mixture ratio of recycled aggregate and recycled concrete; then, the compressive strength of recycled concrete test, analyzes the impact of various factors on the compressive strength of recycled concrete; the splitting tensile strength of recycled concrete test, analyzes the impact of various factors on the splitting tensile strength of recycled concrete the. The results show that: (1) with the increase of recycled coarse aggregate replacement ratio, the tensile strength of most concrete decreases with the decrease of tensile strength. (2) the ratio of water to cement has a great influence on the tensile strength of compressive strength of recycled concrete, which can improve the tensile strength of recycled concrete. (3) the recycled aggregate concrete strength matrix can significantly improve the level of recycled concrete compressive splitting tensile strength of recycled aggregate concrete with maternal strength increase with the increase of splitting tensile strength of recycled concrete compressive grade. (4) fly ash replacing cement on recycled concrete compressive grade splitting tensile strength is adversely affected, with the increase of fly ash content, the splitting tensile strength are reduced in different degrees of compressive grade of recycled concrete. (5) the curing period of concrete has greater impact on splitting compressive strength of recycled concrete compression level, with the increase of curing period of concrete, recycled concrete compressive strength and splitting tensile strength with the increase,but the rate of increase with the growth of time gradually decreased.The research method of this paper can be used for reference in the research of similar engineering problems.The research results of this paper have a good reference and application value for practical engineering.