Experimental Study On Mechanical Properties Of Combined Aggregate Cementitious Composites

As the most widely and consumable used building materials, cement base compositematerial has many advantages, such as wide sources of the raw materials, simplepreparation, good fire resistance property, higher adaptability and application convenienceproperties etc. Based on the traditional cement base, the mixed fine aggregate cement basecomposite material is made by using tail sand instead of part of the standard sand to form anew cement base composite material. It not only reduces the cost of the cement basecomposite material, accelerates the industrial waste recycling, but also greatly protects theenvironment and weakens the hazard of the tail sand and fly ash to the environment.Themechanics performance of the mixed fine aggregate cement base composite materials isanalyzed in this paper mainly through various tests, the main work is as follows:(1) Seven group of different proportion (0,%,40%,50%,60%,80%,100%) of tailsand alternative projects are designed. Mechanical properties of each mix proportion of themixed fine aggregate cement base composite material is analyzed by compression test andbending test. The best tail sand replacement ratio is selected by comparing the test results.(2) Dosage of tail sand, standard sand, PVA fiber, cement and water cement ratio isdetermined by design of mix proportion of the mixed fine aggregate cement basecomposite material. A series of tests are carried to detect the work performance of themixed fine aggregate cement base composite material.(3) Based on the best tail sand replacement ratio and1.5%,2%of the volume dosageof the fiber, the mixed fine aggregate cement base composite material is mixed and cubespecimen are made. Through the cube compressive test and beam and plate bending test,the compressive performance, flexural performance and flexural toughness of the mixedfine aggregate cement base composite material has been evaluated.(4) Mix process and influence factors of fine aggregate cement base compositematerial is determined. The influence rule of tail sand replacement ratio and fiber dosageon the fine aggregate cement base composite material is analyzed. The research results areable to provide reference for engineering application of the mixed fine aggregate cement base composite material.