一种钢渣-高岭土基地质聚合物材料

One Rind of Steel Slag-kadin Badin Based Geopolymer Material

将高岭土和氢氧化钠固体的热活化产物与钢渣混合、水化、压制,制备了一种较高强度的钢渣-高岭土基地质聚合物材料。采用XRD、FTIR和SEM测试方法对原料和合成的地质聚合物材料的表面键合、物相及微观结构的变化进行了分析。质量分数为5%的高岭土碱热活化物料与95%的钢渣粉末制备的地质聚合物材料,其养护3、7和28 d的试块抗压强度分别为20、30和28.9 MPa,达到了非承重墙体建筑材料MU20、MU25和MU30的强度等级标准。表面键合变化表明,反应生成了Si(Al)—O三维网络结构的地质聚合物,钢渣中的硅酸钙受碱激发生成C-S-H凝胶,不反应的固体作填充料增加了材料的抗压强度。

Kaolin was thermally activated with the addition of sodium hydroxide through solid reactions, and geopolymeric materials were prepared with the thermal activation products and steel slags through mixing, hydration and pressure molding. The surface bonding, mineralogy, and microstructure and morphology of the raw material and synthesized geopolymers were fully characterized by using Fourier Transform Infrared Spectroscopy （FTIR） , X-ray Diffraction （XRD） and Scanning Electron Microscope （SEM）. The geopolymeric material with 5wt. % kaolin thermal activation products and 95wt. % steel slags presents the best compressive strength,and the 3 d,7 d and 28 d compressive strength is 20,30 and 28.9MPa, reached the nonbearing wall material level MU20, MU25 and MU30, respectively. The bonding information shows that three dimensional Si （Al）--O structures of geopolymer were generated during the hydration reaction; calcium silicate in the steel slag was activated by alkali to form C-S-H structures and the other substance as filling materials well in- creased the compressive strength.