玄武岩纤维对混凝土抗冻性能的影响OACSTPCD

To investigate the influence and mechanism of basalt fiber content on the frost resistance of concrete,rapid freeze-thaw testes and microscopic pore testes are carried out to investigate the appearance,mass loss rate,relative dynamic elastic modulus,compressive strength,flexural strength,impact elastic wave velocity loss rate and bubble characteristic parameters of concrete with four different basalt fiber contents(0％,0.1％,0.2％,0.3％)during freeze-thaw cycles,and the microscopic mechanism of basalt fiber improving concrete performance is studied by grey entropy analysis.The results show that,(a)the properties of concrete gradually decrease with the increase of freeze-thaw cycles;(b)adding basalt fiber can improve the frost resistance of concrete and there is an optimal dosage;(c)the change of macroscopic properties of basalt fiber reinforced concrete is related to the change of microscopic pore parameters such as pore specific surface area,air content,and pore frequency with chord length＞200 nm;and(d)when the content of basalt fiber is 0.2％,the improvement effect of freezing resistance of concrete is the best.