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机构地区:[1]北京工业大学材料科学与工程学院,北京100124 [2]中国中材国际工程股份有限公司中材研究院,北京100102 [3]唐山北极熊建材有限公司,滦县063705
出 处:《硅酸盐通报》2016年第2期518-524,共7页Bulletin of the Chinese Ceramic Society
基 金:国家科技支撑计划项目子课题(2013BAJ01B04-2)
摘 要:发泡水泥中的孔结构在很大程度上决定了材料的力学和热学性能。为了深入研究发泡水泥的孔结构与力学和热学性能的关系,本文利用图像分析法表征了发泡水泥的孔结构参数(气孔率、气孔尺寸),测试了材料的抗压强度和导热系数。研究结果表明:气孔率、孔壁厚度、气孔尺寸对干密度、抗压强度以及导热系数均有影响。随着气孔率的增大,干密度、抗压强度和导热系数均呈现下降趋势;在相同容重下,导热系数随着平均孔径的增大而升高,抗压强度随之减小,发泡水泥的孔径每增大1 mm,则抗压强度减小25%~30%;气孔尺寸分布近遵循对数正态分布(R2=0.95),高密度的发泡水泥的对数正态分布拟合相关系数相对较高。The pore structure of foamed cement is of great importance to the mechanical and thermal properties. This paper aims to explore the relationship between the pore structure and the mechanical and thermal properties of foamed cement. Image analysis was conducted to characterize the pore structure of foamed cement, and porosity and average pore size were computed to describe the pore structure. The compressive strength and thermal conductivity was also experimental determined. The results show that pore volume, pore size, pore spacing have large influence with dry density, compressive strength and thermal conductivity. For the ultra-light foamed cement insulation board with the same density, thermal conductivity increase with the increase of the mean pore size, each increase of i mm in average pore size results in a decrease of 25%-30% in compressive strength. Pore size distribution is nearly in lognormal distribution (R2 = 0.95 ), and the lognormal distribution fitting correlation coefficient of higher density foam cement is relatively high.
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