Experimental Study On The Behavior Of Beams And Columns With Modified RAC

With the acceleration of urbanization, the amount of construction wasteaccumulation has reached unprecedented heights. The use of recycled concrete waste bybuilding in order to achieve waste recycling has become a hot topic. In this paper, therecycled aggregate collected is used by our group, together with the filling and activecharacteristics with silica fume and water absorbing grain rate with bricks, also andother properties of cracking resistance of fiber. The recycled concrete blocks withdifferent mixing amount of silica fume, fiber, the brick are designed and made toexplore the characteristics of modified RAC. Based on these theories, the11modifiedrecycled concrete beams and5columns with different admixtures of different dosageare made and loaded to study the basic performance under its conventional forces. Thefollowing results can be obtained:?1?According to the contrastive analysis of the indicators, such as standardcompressive strength, axial compressive strength, tensile splitting strength, flexuralstrength and modulus of elasticity of modified RAC blocks with different admixtures ofdifferent dosage, summarized the influence of silicon powder?brick and fiber on themechanical and deformation of recycled concrete.?2?In order to test the beams' mechanical properties of different admixtures,11beams are designed with its one-third point loading test for the load-displacement curve, bearing capacity and deformation based on the block of mechanicalproperties of different admixtures, analyzed the effect of three kinds of results of themodified materials on the properties of the specimen.?3?With the prototype of the late RAC frame sharking table test,12scaleframework columns are designed according to the scale criterion.5columns with different admixtures are made. Through the pseudo static test under low reserved cyclicloading, the paper studies failure mode, the hysteresis loops, bearing capacity, ductility,coefficients, stiffness and energy dissipation capacities with different admixtures. Basedon these theories, and gets some useful conclusions and suggestions.The results show that, the incorporation of silica fume can improve the compressivestrength of recycled aggregate concrete; Fiber makes axial compressive strength, themodified column flexural and splitting tensile strength is increased, but decreasedthe compressive strength of the cube; Incorporation of a small brick's amount makes thetest blocks of axial compressive strength and compressive strength improve a smallmargin.Conclusions show that a small amount of silica fume can reduce the value of eachbeam specimen deflection characteristics, the appropriate amount of silica fume canimprove the cracking load of recycled concrete beams; A small dosage of fiber canimprove the value of bearing capacity of each recycled concrete beams, but the highdosage restricts the growth of its capacity; Small amounts of brick could improve thebeams' cracking load, but also make the yield load and ultimate load reduction withdifferent degrees, and the higher the dosage, the greater the magnitude low.The results also show that, a small incorporation amount of silica fume leads to thesmall hysteresis loop, poor ductility, reduced energy consumption, stiffness degradationand accelerating the carrying capacity of the recession; the right amount of fiber couldreinforce the ductility of RAC columns and make the decay rate low of the stiffnessdegradation and the bearing capacity; Columns mixed with brick make a positiveimpact on the column of the forward carrying capacity. No matter whatthe incorporation of materials, incorporation of the high proportion will makethe ductility performance weaker, stiffness decay rate more quickly and brittleenhancement.