Corrosion resistance test of cast-in-place basalt fiber reinforced concrete under the coupling effect of internal and external magnesium salt sulfate
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
万方数据
维普
