The effect of glass powder on the microstructure of ultra high performance concrete

摘要

Glass powder prepared of various types of recycled bottles was used in ultra-high performance concrete (UHPC). Experimental investigation of glass powder as complete replacement for quartz powder and silica fume showed that UHPC with improved micro-structural and compressive strength properties can be prepared. Glass powder milled to micro-scale undergoes low pozzolanic reaction and acts as catalyst accelerating the dissolution of clinker phases and forms low basicity calcium silicate hydrate (C-S-H). These reactions give positive effect on mechanical and microstructural properties of UHPC. Microstructural investigation was made by mercury intrusion porosimetry (MIP), X-ray diffraction (XRD) analysis and by ~(29)Si MAS NMR analysis. Experimental results revealed that additional compressive strength of 40 MPa can be gained with combination of glass powder and silica fume.