Experimental Study On Crack Resistance Of Cement-fiber Recycled Concrete Beams Without Clinker

In recent years,with the rapid development of the construction industry,a large amount of construction materials have been consumed,the pace of urbanization in China has accelerated,and a large number of original buildings have been demolished and rebuilt,resulting in a large amount of construction waste.For consideration of sustainable development,reducing the amount of cement and recycling of waste is an urgent issue to be solved.At present,scholars at home and abroad have begun to study the use of recycled aggregate instead of natural aggregates,and to use recycled waste generated from industrial production,such as slag and fly ash,as cement materials,to prepare recycled concrete.However,the concrete using these materials is limited in practical use due to its low strength and poor crack resistance.According to research data,fiber can effectively improve the wear resistance,toughness and other properties of non-clinker cement recycled concrete,and make up for the defects of recycled concrete itself.Therefore,in order to improve the basic mechanical properties and crack resistance of non-clinker cement recycled concrete components,this paper analyzes the basic characteristics of non-clinker cement recycled concrete by changing the different incorporation ratios of basalt fiber,basalt fiber and polypropylene fiber.The mechanical properties and crack resistance of the test beams are as follows:Firstly,through the study of the mechanical properties of clinker-free clinker-free recycled concrete and the crack resistance of the test beams,it was found that the basalt fiber can improve the mechanical properties of the clinker-free recycled concrete and improve the crack resistance of the tested beams.The test data show that the test group B12 is better.Secondly,through the study of the mechanical properties of recycled cement-free clinker-recycled concrete and the crack resistance of the test beam,the failure process of cement-free recycled concrete beams is similar to that of ordinary concrete beams.Compared with single-doped basalt fiber,hybrid fiber can improve the mechanical properties of clinker-free recycled concrete and has good effect on the crack resistance of the test beam.By comprehensive comparison and analysis,the test group B12P5 has better effect than other test groups.Based on the results of this experiment,the formulas for maximum crack width and deflection were analyzed;,and the coefficient of influence of K-free cement on the crack width of reinforced concrete members was introduced and No-influence coefficient of cement clinker short fiber reinforced concrete member Stiffiness N,calculate derivation separately.Finally,ANSYS simulation software was used to perform finite element analysis on the hybrid fiber non-clinker cement concrete beams.The simulation data and experimental data were compared and found that the data are basically consistent,indicating that the ANSYS finite element software for the hybrid fiber without clinker cement recycled concrete beams Performance analysis is applicable.