碱激发工业废渣固化淤泥配合比优化研究
Alkali-activated Industrial Waste Residue Solidification Sludge Mix Optimization Study
任天彬 1刘俊新 1曹宽宽 2黄勃翔1
作者信息
- 1. 西南科技大学土木工程与建筑学院,绵阳 621010
- 2. 中铁建设集团有限公司,北京 100000
- 折叠
摘要
为得到碱激发工业废渣固化剂最优配比,以氧化镁、高炉矿渣和粉煤灰掺量为变量因素,固化淤泥7 d、28 d无侧限抗压强度为评价指标,采用响应面法进行试验设计,并建立强度预测回归模型,研究各掺料间交互作用对力学性能的影响,最后,通过优化求解出固化剂最优配比.在此基础上,通过SEM、XRD微观测试,揭示碱激发工业废渣改善淤泥力学性能的微观机理.结果表明,固化淤泥最优配合比为氧化镁∶高炉矿渣∶粉煤灰=4.109％∶13.320％∶5.723％(与干土质量比),基于最优配合比固化淤泥的7 d、28 d实际强度分别为1 518 kPa、2 473 kPa,模型预测强度为1 564 kPa、2 443 kPa,表明通过响应面法优化固化淤泥配合比准确度较高.
Abstract
To determine the optimal ratio of curing agents for alkali-activated industrial waste slag,the effects of MgO,blast furnace slag,and fly ash on the mechanical properties of solidified sludge were investigated.Using the response sur-face methodology,the unconfined compressive strengths at 7 and 28 days of solidified silt samples with varying ratios were compared,leading to the development of a regression model for strength prediction,which was used to identify the optimal curing agent ratio.Additionally,SEM and XRD analyses revealed the microscopic mechanisms responsible for the im-proved mechanical properties of the alkali-activated sludge.The findings indicate that the optimal ratio MgO,blast furnace slag,and fly ash is 4.109％∶13.320％∶5.723％(relative to dry soil mass).Under this optimal mix ratio,the measured compressive strengths at 7 and 28 days were 1 518 kPa and 2 473 kPa,respectively,while the predicted strengths were 1 564 kPa and 2 443 kPa,demonstrating the high accuracy of the response surface method in optimizing the mix ratio for solidified silt.
关键词
固化淤泥/碱激发/工业废渣/响应面法/最优配比/微观机理Key words
solidified silt/alkali excitation/industrial waste residue/response surface method/optimal ratio/micro mechanism引用本文复制引用
出版年
2024
NETL
NSTL
万方数据