基于冻融循环条件下的纤维混凝土抗冻性试验研究

Experimental study on durability of fiber reinforced concrete in freeze-thaw cycle

为解决西部地区混凝土结构遭受不同程度的冻融破坏问题,本次试验以混凝土试件为研究对象,采用快随冻融循环试验方法,探讨了纤维种类及掺量对混凝土抗冻性的影响,研究质量损失率、相对抗压强度及动弹模量损失率、相对抗折强度的变化规律。结果表明:随着纤维掺量的增加,混凝土的相对抗折强度、动弹模量显著提高,而相对抗压强度对掺量变化的敏感度较低;SF对混凝土抗冻性的影响优于PPF。冻融循环条件下,一定掺量范围内,混凝土的抗冻性与纤维掺量呈正相关关系。

Inordertosolvetheproblemsofconcretestructureinwesternregionsubjectedtovaryingdegrees offreeze-thaw damage,the concrete specimens are taken as the object of study.The influence of fiber type and amount on durability of concrete is studied by adopting fast freeze-thaw cycle method.Change regulations of mass loss rate,relative compressive strength,loss of modulus and relative rupture strength are also researched.Subsequently,the results represent that with the increase of fiber content,the relative rupture strength and elastic modulus of concrete increase remarkably,but the relative compressive strength is less sensitive to the change of the content.The influence of SF on the durability of concrete is superior to that of PPF.In freeze-thaw cycles,the durability of concrete is positively relevant to fiber content.