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引用本文:张杰,黄斐,刘文地,付腾飞,邱仁辉.改性竹纤维加气混凝土的制备与界面特性[J].建筑材料学报,2022,25(7):686-692
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改性竹纤维加气混凝土的制备与界面特性
张杰,黄斐,刘文地,付腾飞,邱仁辉
福建农林大学 交通与土木工程学院,福建 福州 350108
摘要:
以竹纤维为增强体制备了加气混凝土,采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对竹纤维进行了表面改性.力学性能测试结果表明,与空白组(未掺加竹纤维)相比,掺加0.1%改性竹纤维的加气混凝土7 d抗折强度提高了58.8%,7 d抗压强度提高了13.8%.傅里叶变换红外光谱及X射线光电子能谱分析表明:KH560的环氧基团与竹纤维表面羟基反应,改性后竹纤维出现了Si—O键和Si元素特征峰,KH560接枝到竹纤维表面,改善了竹纤维与混凝土基体之间的界面特性.X射线衍射分析表明,混凝土内部形成大量高结晶度的片状和针状托勃莫来石组分和低结晶度的低碱水化硅酸钙(C-S-H),两者连接紧密、重叠交错,形成坚固的网状结构.扫描电镜分析表明,竹纤维经KH560表面改性后,与混凝土基体之间的界面结合更加紧密.
关键词:  竹纤维  表面改性  加气混凝土  力学性能  界面结合
DOI:10.3969/j.issn.1007-9629.2022.07.005
分类号:TU528.2
基金项目:福建省高校产学合作重大项目(2018H6004);福建农林大学科技发展基金项目(KFA20100A)
Preparation and Interfacial Characteristics of Modified Bamboo Fibers Reinforced Autoclaved Aerated Concrete
ZHANG Jie, HUANG Fei, LIU Wendi, FU Tengfei, QIU Renhui
College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China
Abstract:
Bamboo fibers were used as reinforcement to prepare autoclaved aerated concretes and the fibers were modified by γ-(2, 3-epoxypropoxy)propyltrimethoxysilane(KH560). The mechanical property results show that the autoclaved aerated concrete with 0.1% addition of modified bamboo fibers has 58.8% and 13.8% higher flexural strength(7 d) and compressive strength(7 d) than those without bamboo fibers, respectively. Fourier transform infrared spectroscopy(FTIR) and X-ray photoelectron spectroscopy(XPS) analysis show that the hydroxyl group of bamboo fibers react with the epoxy group of KH560, the characteristic peaks of Si—O bonds and Si element that emerged in modified bamboo fiber demonstrate that KH560 is grafted to the surface of the bamboo fibers, which improves the interface bonding between the bamboo fibers and the autoclaved aerated concrete matrix. X-ray diffraction(XRD) analysis indicates that a large number of Tobermorites with high crystallinity in the shapes of needle and sheet is formed in the hydration products and they interconnect with each other, forming solid networks. Scanning electron microscope(SEM) analysis also proves that the interfacial bonding is improved after the modification of bamboo fibers with KH560.
Key words:  bamboo fiber  surface modification  autoclaved aerated concrete  mechanical property  interfacial bonding