The Study Of High Strength Steel And High Strength Concrete With Fiber On Bonding Performance In Xinjiang Region

In recent years,China’s construction industry becomes better and better.The state ispromoting the application of high-strength steel and build a series of policies to support it,sothe combination of high strength and high performance concrete reinforced adapt to thefuture trend of building structures.In addition,Xinjiang’climate is diverse and dry.It has bigtemperature difference between day and night.The temperature can reach48℃insummer,winter can reach to-30℃.Unlike hydraulic engineering,building engineeringbuilding structure beams,plates,columns and other structures are in dry indoor environmentin fact.It isn’t contact with the rain,snow and other phenomena outdoor directly.Manyements in the building structure withstand the thermal cycling effects.In this paper,the use of CABR-WNH weathering chamber to simulate thermalcycling,a series of experimental research on high strength fibereinforced concrete with C50than in the design and thermal cycling effects HRB500E with fiber reinforced concretecarried out.At the same time,the HRB500E socialbenefit is analysised,attempting to providea reference for the application of high-strength steel and high performance concrete.Through C50mixing ratio test,we get the best lab mix by the difference of cementratio,superplasticizer dosage,fine aggregate clay content and fiber type.Through thecomparation of28day’s compressive strength of three standard concrete blocks (150mm*150mm*150mm) and non-standard block (100mm*100mm*100mm) in the curingroom,we can conclude that the size effect coefficient is0.85.Thermal cycling test results show that,HRB500E steel under thermal cycling effectsultimate tensile strength decreased,but the loss rate of less intensity.With the increase in thenumber of thermal cycles,the quality of three kinds of concrete test blocks graduallyreduced.Ordinary concrete mass loss is less than the overall upward trend insteel fiber andpolypropylene fiber reinforced concrete,polypropylene concrete loss rate is higher than theother.With the increasing number of thermal cycles,dynamic elasticmodulus showed a downward trend,the minimum loss ratio of polypropylene fiber reinforcedconcrete,followed by the steel fiber reinforced concrete, plain concrete max.With theincrease of the number of thermal cycles,three kinds of concrete draw maximum load andbond strength showed a downward trend, while50times decline larger, slope steeper.Slipcurve showed a upward trend,the much of the number of thermal cycles,the greater theamount of slip.Under the same hot and cold cycles,polypropylene fiber concrete bondingstrength is bigger than ordinary concrete,steel fiber reinforced concrete is minimum.Alsoreplaced with HRB500E equal strength HRB400E,multi-section steel ratio is large andsection steel benefit was not significant in high-rise buildings.