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基于正交试验的泡沫混凝土导热性能和孔结构研究

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以硫铝酸盐水泥、粉煤灰为胶凝材料,采用正交试验法研究了发泡剂、减水剂、增稠剂对于泡沫混凝土导热性能的影响并确定最优组合.制备5 组不同密度(300、400、500、700、900 kg/m3)泡沫混凝土,采用Photoshop图像处理软件对各组样品截面图进行二值化处理,并利用Image-Pro Plus软件对孔隙率、圆度值和孔径分布等孔结构特性进行分析.结果表明,影响泡沫混凝土导热系数的各因素主次顺序为增稠剂、发泡剂、减水剂.泡沫混凝土的密度与孔隙率呈负相关,相关系数R2 为0.91;密度越大,圆度值为1 的孔隙占比越大.不同密度等级泡沫混凝土的孔径分布近似服从对数正态分布,孔径主要集中于200 μm,且大孔径比例随着密度的增大而逐渐降低.
Thermal Conductivity and Pore Structure of Foam Concrete Based on Orthogonal Test
With sulphoaluminate cement and fly ash as cementitious materials,the effects of foaming agent,water reducer and thickener on the thermal conductivity of foam concrete were studied by orthogonal experiment to determine the optimal combination.Five groups of foam concrete with different densities(300,400,500,700,900 kg/m3)were prepared,and the cross-sectional views of the samples were binarized by Photoshop image processing software.The pore structure characteristics such as porosity,roundness value and pore size distribution were analyzed by Image-Pro Plus(IPP)software.The results show the primary and secondary order of the factors affecting the thermal conductivity of foam concrete is thickener content,foaming agent content,water reducer content.The density grade is negatively correlated with porosity and R2 is 0.91.As the density increases,the pores proportion with roundness value of 1 also increases.The pore size distribution of foam concrete with different density grades follows the log-normal distribution approximately,the pore size mainly concentrates at 200 μm,and the proportion of large pore size gradually decreases with density increases.

foam concreteadmixtureorthogonal testthermal conductivitypore structure

李琳、王宇、马玉莹、沈寒琪、罗江红

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宿迁学院建筑工程学院,宿迁 223800

江苏省装配式建筑与智能建造工程研究中心,宿迁 223800

泡沫混凝土 外加剂 正交试验 导热性能 孔结构

江苏高校自然科学研究计划江苏省高等学校自然科学研究项目宿迁市科技计划江苏省装配式建筑与智能建造工程研究中心基金课题

22KJB13001223KJA560007Z2022099fk20230810

2024

硅酸盐通报
中国硅酸盐学会 中材人工晶体研究院

硅酸盐通报

CSTPCD北大核心
影响因子:0.698
ISSN:1001-1625
年,卷(期):2024.43(8)