To explore the variations in the compressive strength,relative dynamic modulus,and mass loss rate of cast-in-place basalt fiber reinforced concrete cubes,as well as the diffusion distribution characteristics of SO42-in the specimens,different volume proportions(0,0.1％,0.3％,0.5％)of short-cut basalt fibers and 3％by mass of anhydrous MgSO4 were mixed into the concrete.Subsequently,cor ro-sion tests were conducted under the coupling effect of different concentrations(0,3％,5％,10％)of Na2SO4 solution.The research re-sults indicate that:(1)the bridging effect of basalt fibers can improve the cubic compressive strength of cast-in-place concrete effectively.It restrained the generation and expansion of micro cracks inside the concrete and suppressed the expansion damage caused by corrosion products.Therefore,the corrosion resistance of cast-in-place concrete is improved.(2)For the same corrosion aging period,the specimens with a volume proportion of 0.3％has the highest cubic compressive strength the lowest mass loss rate,the smallest fluctuation of the rela-tive dynamic elastic modulus,and the strongest corrosion resistance.(3)The corrosion products of cast-in-place basalt fiber concrete are et-tringite(AFt)and gypsumunder the coupling effect of internal and external magnesium salt sulfate.Moreover,the crystallinity of Ca(OH)2 in the M group specimens is poor,and the consumption rate is significantly faster than that in the M3BF group specimens.The research re-sults can provide reference for the engineering application of cast-in-place basalt fiber reinforced concrete in areas with strong saline soil.
basalt fibercast-in-place concreteinternal and external source coupling corrosioncompressive strengthdurability
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