基于CT技术的掺锂渣再生混凝土孔隙结构特征

Pore Structure Characteristics of Recycled Concrete with Lithium Slag Based on CT Technology

利用计算机层析成像(CT)技术对不同再生骨料(RCA)替代率与锂渣(LS)掺量再生混凝土试件的孔隙结构特征进行识别,基于计算机图像处理技术与三维(3D)建模提取并分析了二维(2D)/3D孔隙结构的特征参数,同时利用灰色关联理论探究孔隙结构特征参数对混凝土抗压强度的影响程度.结果表明:LS的加入可以优化再生混凝土的孔隙结构,促进内部结构致密化与孔隙分布均匀化;1~2 mm^(2)孔隙表面积分布、平均密实度、平均球体度与抗压强度的灰色关联度均在0.85以上,表明孔隙结构参数与抗压强度关联性较好.

Computed tomography(CT)technology was used to identify the pore structure characteristics of specimens with different recycled coarse aggregate(RCA)substitution rates and different lithium slag(LS)contents.Based on computer image processing technology and three⁃dimensional(3D)modeling,the characteristic parameters of two⁃dimensional(2D)/3D pore structure were extracted and analyzed.At the same time,the influence degree of characteristic parameters of pore structure on the compressive strength of the concrete was analyzed by means of the grey correlation theory.The results show that addition of LS can optimize the pore structure of recycled concrete and promote the densification and uniformity of pore structure.The grey relational degree between surface area distribution of 1⁃2 mm^(2),average compactness,average sphericity and comprehensive strength all exceeds 0.85,indicating that there is a great correlation between pore structure and comprehensive strength.