一种钢渣-高岭土基地质聚合物材料

摘要

Kaolin was thermally activated with the addition of sodium hydroxide through solid reactions,and geopoly-meric 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 geopoly-mers 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 increased the compressive strength.%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.