碱激发粉煤灰和矿粉改性疏浚淤泥力学特性及显微结构研究

发布时间：2018-04-13 19:27

本文选题：疏浚淤泥 + 固化　；参考：《大连理工大学学报》2017年06期

【摘要】：采用水玻璃作为碱激发剂激发粉煤灰和矿粉的活性来固化疏浚淤泥,对固化淤泥进行无侧限抗压强度试验、扫描电镜(SEM)以及X射线衍射(XRD)测试,研究了固化材料配比、龄期、水玻璃掺量及水玻璃模数对固化疏浚淤泥强度的影响,确定了各组分之间的最佳配比,观测了固化淤泥的物相组成及显微结构特征.力学试验结果表明:水玻璃掺量7%、模数1.0~1.5时对粉煤灰和矿粉的激发效果最优,相比于粉煤灰,水玻璃对矿粉的激发效果更佳;水玻璃模数相同的情况下,矿粉掺量越大强度越高;各组分最优配比(疏浚淤泥、矿粉、水玻璃质量比为60∶40∶7)时,28d无侧限抗压强度可达到12 140kPa.SEM和XRD试验结果显示:在水玻璃的激发下,固化淤泥水化生成长石类和沸石类等晶相,这些晶相连接紧密,形成致密的微观结构,这是固化后疏浚淤泥强度的最重要来源.
[Abstract]:The activity of fly ash and mineral powder activated by sodium silicate as alkali activator was used to solidify dredged silt. The unconfined compressive strength test, scanning electron microscope (SEM) and X-ray diffraction (XRD) test were carried out to study the ratio and age of solidified silt.The effect of water glass content and water glass modulus on the strength of solidified dredged silt was studied. The optimum proportion of each component was determined and the phase composition and microstructure of solidified silt were observed.The results of mechanical test show that when the dosage of water glass is 7 and modulus is 1.0 ~ 1.5, the excitation effect of fly ash and mineral powder is the best, compared with that of fly ash, water glass excites ore powder better than fly ash, and when the modulus of water glass is the same, the excitation effect of water glass is better than that of fly ash, and when the modulus of water glass is the same,When the ratio of dredged silt, ore powder and water glass is 60: 40: 7, the unconfined compressive strength can reach 12 140kPa.SEM for 28 days. The results of XRD test show that under the excitation of water glass, the compressive strength can reach 12 140kPa.SEM.Solidified silt hydrates to form feldspar and zeolite crystalline phases which are closely connected to form a compact microstructure which is the most important source of the strength of dredged sludge after solidification.
【作者单位】：江南大学环境与土木工程学院;
【基金】：国家自然科学基金资助项目(51609102) 大连理工大学海岸和近海工程国家重点实验室开放基金资助项目(LP1613) 江苏省大学生创新训练项目(2016101Z)
【分类号】：TU447

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