基于正交试验的泡沫混凝土导热性能和孔结构研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (8): 2888-2896.

基于正交试验的泡沫混凝土导热性能和孔结构研究

李琳^1,2, 王宇^1,2, 马玉莹¹, 沈寒琪¹, 罗江红¹

1.宿迁学院建筑工程学院,宿迁 223800;
2.江苏省装配式建筑与智能建造工程研究中心,宿迁 223800

收稿日期:2023-12-07 修订日期:2024-01-17 出版日期:2024-08-15 发布日期:2024-08-12
作者简介:李琳(1983—),女,博士,副教授。主要从事新型建筑材料的研究。E-mail:ll86268555@163.com
基金资助:
江苏高校自然科学研究计划(22KJB130012);江苏省高等学校自然科学研究项目(23KJA560007);宿迁市科技计划 (Z2022099);江苏省装配式建筑与智能建造工程研究中心基金课题(fk20230810)

Thermal Conductivity and Pore Structure of Foam Concrete Based on Orthogonal Test

LI Lin^1,2, WANG Yu^1,2, MA Yuying¹, SHEN Hanqi¹, LUO Jianghong¹

1. School of Architectural Engineering, Suqian College, Suqian 223800, China;
2. Jiangsu Province Engineering Research Center of Prefabricated Building and Intelligent Construction, Suqian 223800, China

Received:2023-12-07 Revised:2024-01-17 Online:2024-08-15 Published:2024-08-12

摘要/Abstract

摘要： 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。

关键词: 泡沫混凝土, 外加剂, 正交试验, 导热性能, 孔结构

Abstract: 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.

Key words: foam concrete, admixture, orthogonal test, thermal conductivity, pore structure

中图分类号:

TU528

李琳, 王宇, 马玉莹, 沈寒琪, 罗江红. 基于正交试验的泡沫混凝土导热性能和孔结构研究[J]. 硅酸盐通报, 2024, 43(8): 2888-2896.

LI Lin, WANG Yu, MA Yuying, SHEN Hanqi, LUO Jianghong. Thermal Conductivity and Pore Structure of Foam Concrete Based on Orthogonal Test[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2888-2896.

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