Preparation and Characterization of Calcium Silicate Slag Based Lightweight Wall Materials
Potassium feldspar (KAlSi3O8) can be used to extract potassium to solve the shortage of water soluble potash resources in China,but it will produce large amount of calcium silicate slag.Resource recycling from calcium silicate slag can be realized by preparing wall materials.In this research,calcium silicate slag based lightweight wall materials have been successfully prepared by calcium silicate hydrates (CSH),lime and fly ash through autoklave process.Furthermore,the wall materials are characterized by strength determination,X-ray diffraction (XRD) analysis,and scanning electron microscopy (SEM) analysis.The results show that the compressive strength is mainly influenced by the lime/fly ash mass ratio (L/F),CSH content and water/solid ratio (W/S).The compressive strength of 21.1-23.9 MPa and density of 0.87-0.91 g/cm3 are achieved respectively with the L/F value of 0.82-1.00,CSH content of 70 % and W/S of 0.9.The main hydrate product of wall materials is 11(A) tobermorite Ca5(OH)2Si6O16·4H2O,which is partly formed from the phase transformation of CSH,and partly produced by the reaction among raw materials during the process of autoclaving.The tobermorite is easy formed at low L/F value and it has a contribution to the low density for its flake-like structure that make the materials porous.
Calcium silicate slag Wall materials Tobermorite Mechanical property
Lei HOU Jin-hong LI Ling-xin TONG
National Laboratory of Mineral Materials,China University of Geosciences,100083,China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
110-114
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）