摘要
运用正交试验,制作油菜秸秆纤维混凝土试件,探究水灰比(0.45、0.50、0.55、0.60)、油菜秸秆纤维长度(15~20、>20~25、>25~30、>30~35 mm)和秸秆纤维体积掺量(0.50%、1.00%、1.50%、2.00%)对油菜秸秆纤维混凝土抗碳化性能的影响。极差分析结果表明,3因素对油菜秸秆混凝土抗碳化性能影响的大小依次为水灰比、秸秆纤维长度、秸秆纤维体积掺量,最优组合为水灰比0.45、秸秆纤维长度为>30~35 mm、秸秆纤维体积掺量1.50%。取最优水平组试件作电镜扫描观察,发现油菜秸秆纤维的掺入,能够改善水泥浆体内部孔隙结构,使混凝土碳化深度最多可减小35.31%,从而提高混凝土的抗碳化性能。采用最小二乘法回归分析建立的油菜秸秆纤维混凝土碳化深度预测模型,验证离散系数接近0.05。
Under the condition of orthogonal test,rapeseed straw fiber concrete specimen were made to study the influence of water-cement ratio(0.45,0.50,0.55,0.60),straw fiber length(15~20 mm,>20~25 mm,>25~30 mm,>30~35 mm)and straw fiber volume content(0.50%,1.00%,1.50%,2.00%)on the carbonation depth of rape straw fiber concrete.The orthogonal test result shows that the influence of the three variables on the carbonization resistance of rape straw fiber concrete is water-cement ratio,straw fiber length and straw fiber volume content.The optimal level for carbonization resistance of rape straw fiber concrete is the water-cement ratio of 0.45,the straw fiber length of 30-35 mm,and the straw fiber volume content of 1.50%.The electron microscope scanning observation was found that the addition of straw into ordinary concrete could improve the microporous structure of cement slurry,so that the carbonation depth of concrete can be reduced by up to 35.31%,which indicates its carbonization resistance improves.The carbonation depth prediction model of rape straw fiber concrete was built through regression analysis of the least square method,and it was verified that the dispersion coefficient is close to 0.05.
作者
张文俊
刘保华
周文
赵志华
肖宏
叶煜飘
陈礼德
ZHANG Wenjun;LIU Baohua;ZHOU Wen;ZHAO Zhihua;XIAO Hong;YE Yupiao;CHEN Lide(College of Water Resources and Civil Engineering,Hunan Agricultural University,Changsha,Hunan 410128,China;Hunan Agricultural Equipment Research Institute,Changsha,Hunan 410125,China;Hunan Hengyang Agricultural Technical Service Center,Hengyang,Hunan 421001,China)
出处
《湖南农业大学学报(自然科学版)》
CAS
CSCD
北大核心
2021年第1期96-100,共5页
Journal of Hunan Agricultural University(Natural Sciences)
基金
湖南省自然科学基金项目(2019JJ60030)
衡阳市农机局项目(2018XNY-JS151)。
关键词
油菜秸秆纤维混凝土
水灰比
纤维长度
纤维体积掺量
模型
碳化
rape straw fiber concrete
water-cement ratio
fiber length range
fiber volume content
model
carbonization