秸秆纤维对混凝土复合材料抗冻性能的影响

Effect of Straw Fiber on Frost Resistance of Concrete Composites

文章探究冻融循环损伤下秸秆纤维混凝土抗冻性能,选取复合硅酸盐水泥、硅灰、减水剂、油菜秸秆等原材料,制备秸秆纤维,秸秆纤维掺量分别取2.5%、5.0%和7.5%,制备秸秆纤维混凝土试件,在不同冻融循环次数下测试试件的抗压强度、质量损失率和动弹性模量。结果表明:冻融循环次数会影响试件的抗压强度、质量损失率和动弹性模量。在相同的秸秆纤维掺量下,随着冻融循环次数的增加,秸秆纤维混凝土的抗压强度和动弹性模量均明显降低,且秸秆纤维掺量越小试件质量损失率越高。

This paper explores the frost resistance of straw fiber reinforced concrete under freeze-thaw cycle damage,and selects composite Portland cement,silica fume,water reducer,rape straw and other raw materials to prepare straw fiber,and the straw fiber content is 2.5%,5.0%and 7.5%,respectively,to prepare straw fiber reinforced concrete specimens,and the compressive strength,mass loss rate and dynamic elastic modulus of the specimens are tested under different freeze-thaw cycles.The results show that the number of freeze-thaw cycles affects the compressive strength,mass loss rate and dynamic elastic modulus of the specimen.With the increase of freeze-thaw cycles,the compressive strength and dynamic elastic modulus of straw fiber reinforced concrete decrease significantly with the increase of the number of freeze-thaw cycles,and the smaller the straw fiber content,the higher the mass loss rate of the specimen.