Investigation on the performances of high volume white mud-fly ash brick

摘要

In this paper, non-fired load-bearing wall bricks were prepared with high volume of white mud and CFBC fuel ash in laboratory scale. The effects of manufacturing parameters on the performances of the brick, such as mechanical properties, antifreeze and dry shrinkage, etc., were investigated. The impact of different curing regimes on these performances of the bricks with various raw materials formula has also been investigated. The experimental results show that the compressive strength of the brick could come up to 25.1MPa and the all other performances can meet Chinese national standard requirements. The best formula that bricks having the best performance is when the white mud dosage is 30%, and the best curing regime is autoclaved 180°C,10h. The microstructure of the brick was examined by FESEM, XRD and EDS. Tobermorite (C_5S_6H_5) has been generated at this time, which has a better crystallinity and has a higher silicon polymerization degree.