纤维素纤维混凝土抗渗工艺配方优化及抗渗机理分析  

Optimization of Anti-Permeability Formula and Analysis of Anti-Permeability Mechanism of Fiber Concrete

作　　者：胡巍 谢金文 练明 李政 吴先晨 Hu Wei;Xie Jinwen;Lian Ming;Li Zheng;Wu Xianchen(Jiangxi Building Materials Product Quality Supervision and Inspection Station Co.Ltd.,Nanchang,Jiangxi 330001)

机构地区：[1]江西省建材产品质量监督检验站有限公司,江西南昌330001

出　　处：《江西建材》2024年第7期59-61,67,共4页

摘　　要：混凝土的抗渗性能直接影响其耐久性和使用寿命。纤维在混凝土中主要起到增强和增韧作用,降低混凝土的渗透性,减少收缩裂缝,从而提升混凝土的整体抗渗性、耐久性和使用寿命。文中通过四因素三水平正交试验,对纤维混凝土抗渗工艺配方进行了优化,并对纤维混凝土的抗渗机理进行了研究。正交试验得到纤维混凝土最优工艺配方组合为A_(2)B_(2)C_(2)D_(2),即粉煤灰15%(wt)、矿粉15%(wt)、膨胀剂6%(wt)、纤维素纤维1.2 kg/m^(3)。低场核磁共振谱分析显示,掺入粉煤灰和矿粉可有效减少小孔隙面积,而纤维素纤维的掺入则使中孔隙面积减小。研究结果表明,掺入粉煤灰、矿粉、膨胀剂和纤维素纤维均可有效提高混凝土的抗渗性能,合理掺入掺合料可有效提高混凝土抗渗性能。文中相关研究成果能够为科研人员、工程技术人员提供基础数据和微观机理方面的参考。The anti-permeability performance of concrete directly affects its durability and service life.Fibers mainly play a role in enhancing and toughening concrete,reducing its permeability and the formation of shrinkage cracks,thereby improving the overall anti-permeability,durability,and service life of concrete.This study optimized the anti-permeability formula of fiber concrete through a four-factor,three-level orthogonal experiment and studied the anti-permeability mechanism of fiber concrete.The optimal process formula combination of fiber concrete obtained from the orthogonal experiment was A_(2)B_(2)C_(2)D_(2),which refers to 15%(wt)fly ash,15%(wt)mineral powder,6%(wt)expansion agent,and 1.2 kg/m^(3) cellulose fiber.Low-field nuclear magnetic resonance spectroscopy analysis showed that the incorporation of fly ash and mineral powder can effectively reduce the small pore area,while the incorporation of cellulose fiber reduces the medium pore area.The research results indicate that the incorporation of fly ash,mineral powder,expansion agent,and cellulose fiber can effectively improve the antipermeability performance of concrete.Reasonable addition of admixtures can effectively improve the anti-permeability performance of concrete.The relevant research results of this study can provide basic data and micro-mechanism references for researchers and engineering technicians in the construction field.

关 键 词：纤维素纤维 防水混凝土 抗渗结构 工艺优化 微观机理 

分 类 号：TU528[建筑科学—建筑技术科学]