Corrosion resistance test of cast-in-place basalt fiber reinforced concrete under the coupling effect of internal and external chloride and sulfate
To explore the salt erosion resistance of cast-in-place basalt fiber reinforced concrete in a strong saline soil environment,a se-ries of corrosion resistance tests were conducted on cast-in-place basalt fiber reinforced concrete immersed in Na2SO4 solutions with vari-ous concentrations(0,3％,5％,10％).The experimental concrete was mixed with different volume percentages(0,0.1％,0.3％,0.5％)of short-cut basalt fiber and 3％NaCl solution.The research results indicate that:(1)adding chloride salts accelerates the early hydration rate of cement in cast-in-place concrete significantly,but the rapid hydration resulted in a slowdown in the growth rate of concrete strength in later period,so the macroscopic durability performance of the specimens are poorer compared to the benchmark group specimens;(2)The bridging effect of basalt fibers delays the generation and propagation of internal microcracks in cast-in-place concrete.The erosion resis-tance of specimen under the coupling effect of internal and external chloride and sulfate are enhanced;(3)The specimen with 0.3％basalt fiber content has the highest cubic compressive strength and flexural strength.This specimen exhibited the most smoothly change in relative dynamic modulus,the smallest mass loss rate,the least corrosion products,and the strongest resistance to the coupling effect of internal and external chloride and sulfate.The research results can provide reference basis for the engineering application of cast-in-place basalt fiber concrete in strongly saline soil areas.
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