几种填料对偏高岭土-粉煤灰基地质聚合物的增强改性

为提高地质聚合物（GP）的力学强度，制备了含钛酸钾晶须、磷酸钙（β-TCP）、羟基磷灰石（HAP）和碳纳米管（CNTs）增强填料的偏高岭土-粉煤灰基GP复合材料，对其进行了抗压强度测试，并且采用了扫描电子显微镜（SEM）、X-射线衍射仪、傅里叶变换红外光谱仪以及热重分析仪分别表征了其微观形貌、结晶形态、化学组成以及耐热性能。研究结果表明，由钛酸钾晶须、β-TCP、HAP和CNTs增强的GP的最大抗压强度分别可达71.97，65.10，70.98，67.02 MPa。比纯GP的最大抗压强度（56.91 MPa）分别提高了26.46%，14.39%，24.72%，17.76%。SEM表征显示，加入增强填料后，GP试样断面裂缝大大减少，结构也比纯GP更密实，这有利于提高GP的抗压强度。此外，2%质量分数的钛酸钾晶须能使GP的热失重率降低22.7%，有效地提高了GP的耐热性能。

Reinforcement and Modification of Metakaolin-Fly Ash Based Geopolymer with Several Fillers

To improve the mechanical strength of geopolymer（GP），metakaolin-fly ash based GP composites were prepared using potassium titanate whiskers，calcium phosphate，hydroxyapatite and carbon nanotubes as reinforcing fillers. The compressive strength of the composites was tested and their micromorphology，crystalline morphology，chemical composition and heat resistance were characterized by scanning electron microscopy（SEM），X-ray diffraction，Fourier transform infrared spectroscopy and thermogravimetric analyzer. The study results show that the maximum compressive strength of GP reinforced by potassium titanate whisker，calcium phosphate，hydroxyapatite and carbon nanotubes can reach 71.97，65.10，70.98 and 67.02 MPa，respectively. Compared with pure GP，the corresponding values （56.91 MPa） were improved by 26.46%，14.39%，24.72% and 17.76% respectively. SEM show that the fracture in the section of GP samples significantly reduce and the structure is more compact than that of pure GP after adding the reinforced fillers，which is conducive to improving the compressive strength of GP. In addition，potassium titanate whisker with 2% mass fraction can reduce the thermal weight loss of GP by 22.7%，which effectively improves the thermal resistance of GP.