基于响应面法的地聚物混凝土力学性能试验研究

摘要/Abstract

摘要： 为获得力学性能最优的地聚物混凝土配合比,本文系统研究了以粉煤灰和矿渣为前驱体的地聚物混凝土配合比优化方法,选择水胶比、碱激发剂模数(碱激发剂中SiO₂与Na₂O分子数之比)和矿渣掺量(矿渣占前驱体的质量分数)三个因素设计响应面方案进行地聚物混凝土抗压试验。采用统计学方法建立抗压强度响应面模型,并验证模型与试验结果的契合度。结果表明:水胶比对地聚物混凝土的抗压强度影响显著,水胶比最佳选择为0.376;矿渣掺量对地聚物混凝土抗压强度的影响极其显著,矿渣替代粉煤灰的比例越高,地聚物混凝土抗压强度越高,矿渣最佳掺量为48.2%;激发剂模数对地聚物混凝土抗压强度的影响不显著。水胶比会影响基体的孔隙结构,矿渣通过改变基体结构密实度进而影响基体宏观力学性能。

关键词: 地聚物混凝土, 响应面法, 优化设计, 力学性能, 微观结构

Abstract: In order to obtain the optimal mixture ratio of geopolymer concrete with the best mechanical properties, the optimization method of mix ratio of geopolymer concrete with fly ash and slag as precursors was systematically. The water/binder ratio, alkali activator modulus (the ratio of SiO₂ and Na₂O molecules in alkali activator) and slag content (the mass fraction of slag in precursor) were selected as variables to design the response surface scheme for compressive test of geopolymer concrete. The response surface model of compressive strength was established by statistical method, and the fit between model and test results was verified. The results show that the water/binder ratio has a significant effect on the compressive strength of geopolymer concrete, and the best choice of water/binder ratio is 0.376. The effect of slag content on the compressive strength of geopolymer concrete is extremely significant. The higher the proportion of slag instead of fly ash is, the higher the compressive strength of geopolymer concrete is. The optimum content of slag is 48.2%. The modulus of activator has no significant effect on the compressive strength of geopolymer concrete. The water/binder ratio affects the pore structure of matrix, and the slag affects the macroscopic mechanical properties of matrix by changing the compactness of matrix structure.

Key words: geopolymer concrete, response surface method, optimal design, mechanical property, microstructure

中图分类号:

TU528

张震洋, 张璐, 伊海赫, 郑润, 马克顺, 张琳, 任梦琪, 王春光. 基于响应面法的地聚物混凝土力学性能试验研究[J]. 硅酸盐通报, 2024, 43(9): 3192-3202.

ZHANG Zhenyang, ZHANG Lu, YI Haihe, ZHENG Run, MA Keshun, ZHANG Lin, REN Mengqi, WANG Chunguang. Mechanical Properties of Geopolymer Concrete Based on Response Surface Method[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3192-3202.

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