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首页> 外文期刊>Journal of materials in civil engineering >Physicochemical and Mechanical Properties of Polymer-Amended Kaolinite and Fly Ash-Kaolinite Mixtures
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Physicochemical and Mechanical Properties of Polymer-Amended Kaolinite and Fly Ash-Kaolinite Mixtures

机译：聚合物制备高岭土的物理化学和机械性能和飞灰 - 高岭土混合物

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Environmentally and ecologically friendly biopolymers (xanthan gum, chitosan) and synthetic polymers (polyethylene oxide, polyacrylamide) were employed as novel binders to improve the engineering performance of kaolinite and fly ash-kaolinite mixtures. The floc size, microstructure, physicochemical properties (pH, electrical conductivity, and zeta potential) of polymer-amended kaolinite were investigated, which provided in-depth understanding of the improvement of mechanical properties (Atterberg limits, compaction characteristics, thermal conductivity, and shear strength) from micro to macro. Based on the laboratory observations, it is demonstrated that polyethylene oxide (PEO), chitosan, and polyacrylamide (PAM) induced higher degree of face-to-face (FF) aggregated microfabric through polymer bridging and charge neutralization while xanthan gum led to more edge-to-edge (EE) particle associations. The addition of fly ash was found to reduce the plasticity index, increase the maximum dry unit weight, and decrease the optimum water content of kaolinite, while the organic agents were found to increase the liquid limit and decrease the maximum dry unit weight. The thermal conductivity of fly ash-kaolinite mixtures was found relatively low compared to pure kaolinite, which decreased continuously as the polymer content increased. The unconfined compressive strength (UCS) of organically modified soil increased slightly as the xanthan gum content increased. However, the UCS decreased with the further increase of polymer content (0.1% by weight).
机译：使用环保和生态友好的生物聚合物（黄原胶，壳聚糖）和合成聚合物（聚环氧乙烷，聚丙烯酰胺）作为新型粘合剂，以改善高岭石和飞灰 - 高岭石混合物的工程性能。研究了聚合物修正的高岭石的絮凝尺寸，微观结构，物理化学性质（pH，导电性和Zeta电位），提供了对机械性能的改善（Atterberg限制，压实特性，导热系数和剪切的深入了解从微米到宏的力量。基于实验室观察，证明了聚环氧丙烷（PEO），壳聚糖和聚丙烯酰胺（PAM）诱导较高程度的面对面（FF）通过聚合物桥接和电荷中和，而黄原胶导致更多的边缘-to-Edge（EE）粒子关联。发现添加粉煤灰以减少可塑性指数，增加最大干燥单位重量，并降低高岭石的最佳含水量，同时发现有机试剂增加液体限制并降低最大干燥单位重量。与纯高岭石相比，粉煤灰 - 高岭石混合物的导热率相对较低，随着聚合物含量的增加，连续降低。随着黄原胶含量的增加，有机修饰土壤的无束缚的抗压强度（UCS）略有增加。然而，UCS随着聚合物含量（> 0.1重量％）的进一步增加而降低。

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