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基于SEM和ICT的建筑垃圾再生砖细观破坏机理
Microscopic Damage Mechanism of Construction Waste Recycled Brick Based on SEM and ICT
2014年第10期
:建筑垃圾再生砖;扫描电镜; 工业CT;筋络结构;分形理论
Construction waste recycled brick; SEM; Industrial CT; Sinew structure; Fractal theory
2014年第10期
1000-4637(2014)10-93-05
河北省自然科学基金项目(E2010001034)
宿 辉,唐 阳,韩国松,汪 健,聂汉江
河北工程大学水电学院,邯郸 056038

宿 辉,唐 阳,韩国松,汪 健,聂汉江

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摘 要:以建筑垃圾再生砖为研究对象,进行了单轴压缩试验,拟合了应力-应变曲线,采用扫描电镜(SEM)对再生砖的细观结构进行观测,利用工业CT获得了再生砖压缩破坏过程中的裂纹分布特征,并借助分形理论进行分析裂纹演化特征。研究结果表明:建筑垃圾再生砖具有较大的孔隙率,存在诸多的初始缺陷,裂纹容易最先在这些薄弱环节出现。水泥石将骨料包裹起来形成筋络结构可分割破坏区,延缓裂缝的伸展及汇聚过程,可有效提高再生砖的强度。同时再生砖具显著的不均匀性,在荷载作用下不同断面的分形维数的变化规律有较大的差异,断面上平均强度越高,分形维数的变化越平缓,反之则变化要更剧烈,但整体物理性能与混凝土是相似的。CT和SEM结合可有效地对建筑材料的微观结构和破坏机理进行分析,为进一步揭示再生砖的细观损伤破裂机理奠定基础。 Abstract: Based on the uniaxial compression test of construction waste recycled brick, the stress-strain curve was fitted, and the microscopic structure of recycled brick are observed by SEM. Crack distribution characteristics in the process of recycled brick compression failure were gained by using industrial computed tomography (CT), and the crack evolution characteristics were analyzed by means of fractal theory. The researches indicate that: construction waste recycled bricks have larger porosity, it exists many initial defects in the recycled aggregates, in these weak links cracks easily appears first and face to internal development of the cement matrix. Aggregates are wrapped by the cement matrix and only to form the sinew structure of separable damage zone, the cracks extension and the convergence process are delayed, the strength of the recycled brick can be efficiently improved. Meanwhile, recycled brick has the inhomogeneity, it exists some differences that change rules of the fractal dimension about different cross section in the load condition are major, the average strength higher, the fractal dimension changes more gently, the opposite changes are more severe, but the overall physical properties and the deformation regularity of under uniaxial loading is similar with those of concrete; the microstructures of construction materials and failure mechanism are analyzed by CT and SEM, which lays a foundation for further revealing the microscopic damage fracture mechanism of the recycled brick.
英文名 : Microscopic Damage Mechanism of Construction Waste Recycled Brick Based on SEM and ICT
刊期 : 2014年第10期
关键词 : :建筑垃圾再生砖;扫描电镜; 工业CT;筋络结构;分形理论
Key words : Construction waste recycled brick; SEM; Industrial CT; Sinew structure; Fractal theory
刊期 : 2014年第10期
DOI :
文章编号 : 1000-4637(2014)10-93-05
基金项目 : 河北省自然科学基金项目(E2010001034)
作者 : 宿 辉,唐 阳,韩国松,汪 健,聂汉江
单位 : 河北工程大学水电学院,邯郸 056038

宿 辉,唐 阳,韩国松,汪 健,聂汉江

摘要
参数
结论
参考文献
引用本文

摘   要:以建筑垃圾再生砖为研究对象,进行了单轴压缩试验,拟合了应力-应变曲线,采用扫描电镜(SEM)对再生砖的细观结构进行观测,利用工业CT获得了再生砖压缩破坏过程中的裂纹分布特征,并借助分形理论进行分析裂纹演化特征。研究结果表明:建筑垃圾再生砖具有较大的孔隙率,存在诸多的初始缺陷,裂纹容易最先在这些薄弱环节出现。水泥石将骨料包裹起来形成筋络结构可分割破坏区,延缓裂缝的伸展及汇聚过程,可有效提高再生砖的强度。同时再生砖具显著的不均匀性,在荷载作用下不同断面的分形维数的变化规律有较大的差异,断面上平均强度越高,分形维数的变化越平缓,反之则变化要更剧烈,但整体物理性能与混凝土是相似的。CT和SEM结合可有效地对建筑材料的微观结构和破坏机理进行分析,为进一步揭示再生砖的细观损伤破裂机理奠定基础。

Abstract: Based on the uniaxial compression test of construction waste recycled brick, the stress-strain curve was fitted, and the microscopic structure of recycled brick are observed by SEM. Crack distribution characteristics in the process of recycled brick compression failure were gained by using industrial computed tomography (CT), and the crack evolution characteristics were analyzed by means of fractal theory. The researches indicate that: construction waste recycled bricks have larger porosity, it exists many initial defects in the recycled aggregates, in these weak links cracks easily appears first and face to internal development of the cement matrix. Aggregates are wrapped by the cement matrix and only to form the sinew structure of separable damage zone, the cracks extension and the convergence process are delayed, the strength of the recycled brick can be efficiently improved. Meanwhile, recycled brick has the inhomogeneity, it exists some differences that change rules of the fractal dimension about different cross section in the load condition are major, the average strength higher, the fractal dimension changes more gently, the opposite changes are more severe, but the overall physical properties and the deformation regularity of under uniaxial loading is similar with those of concrete; the microstructures of construction materials and failure mechanism are analyzed by CT and SEM, which lays a foundation for further revealing the microscopic damage fracture mechanism of the recycled brick.

关键词:
:建筑垃圾再生砖;扫描电镜;工业CT;筋络结构;分形理论
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(1)建筑垃圾再生砖具有较大的孔隙率,存在大量宏观孔洞、裂缝,呈无规则分布,同时再生骨料、骨料与水泥石基体间的界面过渡区存在较多的原始缺陷,受到荷载作用,裂纹容易最先在这些薄弱环节出现,向水泥石基体内部发展。
(2)采用合理配比,添加适量粉煤灰及外加剂,再生砖的水泥水化和粉煤灰二次水化充分,可以形成致密的水泥石基体,将骨料包裹起来形成筋络结构,再生骨料界面过渡区内多晶化和多孔化的现象减弱,增强了界面过渡区的致密性,可分割破坏区,延缓裂缝的伸展及汇聚过程,有效提高再生砖的强度。建筑垃圾再生砖替代传统黏土砖和建筑砌块是完全可行的。
(3)再生砖具有断面及不同断面间不均匀性,在荷载作用下,不同断面的分形维数的变化规律有较大的差异,断面上平均强度越高,分形维数的变化越平缓,反之则变化要更剧烈,但整体物理性能及单轴荷载作用下的变形规律与混凝土是相似的。
(4)CT灰度图像由于分辨率的原因,细小裂纹的萌生、延展等细节很难辨别,而SEM可以对更细观的缺陷进行分析,并可以对水泥石中的化学组分进行辨识和研究,两者结合可以优势互补,更有效地对建筑垃圾再生砖的微观结构和破坏机理进行分析。
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