Experimental Study On The Strength Of High Strength Basalt Fiber Pumping Concrete

High strength pumping concrete for its adaptation of nation-building more andmore widely used, but its brittle and easy to crack defects limit its application, sochoose fiber as a mixed set blends into fiber reinforced concrete in order tocompensate for their performance inadequacies. Today, the major toughening fibersinclude steel fibers, carbon fibers, polypropylene fibers and glass fibers.Basalt fiber (BF) is a new concrete strength material, the volcanic basalt ore asraw material by crushing, high temperature melting and brushed from inorganic fibermaterial which has natural compatibilities and Predominant mechanical Properties.BF was praised as a omnipotent fiber in2lst century. Basalt fiber reinforced concrete(BFRC) of which has good mechanical properties was made with basalt fiber wrappedwith grout and then mixed with concrete. Also found that the basalt powder having anactive, play a reinforcing effect on the cement base.This thesis is based on a lot of documentation and theoretical studies, thefollowing test study and draw relevant conclusions:（一）Effect of addition amount of basalt reactive powder on strength of strength ofPortland cement mortar was investigated herein. The optimum mix amount of basaltreactive powder was determined by flexural strength and compressive strength. Thevariations of hydration products were investigated by X-ray diffraction (XRD), andstrengthening mechanism of basalt reactive powder was analyzed. The results showedthat the flexural strength and compressive strength of Portland cement mortar couldbe greatly improved by mixing basalt reactive powder, and the reinforcing action wasthe best when the adding amount of basalt reactive powder reached10%.（二）This paper studied the effect of different volume(0,1,2,3,4,5kg/m3) andslenderness ratios of basalt fiber for the high-strength pumping concrete (C50andC60) of mechanical properties, and basalt fiber have some influence on the workingPerformance of Pumping concrete. Discusses the mechanism of fiber reinforcedconcrete. The results show that: with the dosage increase of basalt fiber, the fluidity ofconcrete is reduced and the compressive strength, splitting tensile strength, flexuralstrength are decreased, different slenderness ratios of basalt fiber on for thehigh-strength pumping concrete of mechanical properties slenderness ratios ofdifferent effect，and draws a conclusion that the most appropriate basalt fiber volumevalue is3kg/m3. （三）A total of5Basalt fiber reinforced high strength concrete filled steel tubular(BFRCFST) short column specimens and1high strength concrete filled steel tubular(CFST) short column specimens were tested under axial compression load．Theinfluences of the volumetric content of basalt fiber and slenderness ratios of basaltfiber on the compression behavior of the concrete filled steel tubular short columnswere investigated．The test revealed that BFRCFST was different from the normalstrength CFST on the longitudinal load vs. longitudinal strain (reformat ion) curves,horizontal deformation, overall deformation characters and load bearingcapacity．The results indicate that，with the increasing of the volumetric content ofbasalt fiber，BFRCFST specimens show a slight increase in the load bearingcapacity．With the slenderness ratios of basalt fiber increasing，BFRCFST specimenshave an increasing trend in the load bearing capacity.