全废渣蒸压粉煤灰砖冻融循环试验研究

Experimental study on freeze-thaw cycles of all slag autoclaved fly ash brick

蒸压粉煤灰砖的抗冻性能是衡量其耐久性的重要指标。通过对不同原料配合比、不同龄期的全废渣蒸压粉煤灰砖的冻融循环试验研究,结合现有理论分析,结果表明:全废渣蒸压粉煤灰砖在经历15次冻融循环后表面基本完好,试件平均质量和强度有所增长,在经历30次冻融循环之后,砖的质量损失率和强度损失率会明显增大;适当增加骨料掺量,可以提高砖的抗冻性能;电石渣和粉煤灰掺量过大对砖抗冻性不利,电石渣比粉煤灰对砖的抗冻性更为不利;出釜龄期短的砖与龄期长的砖相比,后者比前者的抗冻性好。

Frost resistance of autoclaved fly ash brick is an important indicator to measure its durability. Through the experi-mental research on different mix of raw materials,different ages of all slag autoclaved fly ash brick freeze-thaw cycles, combinedwith the existing theoretical analysis,the results show that：after experiencing 15 freeze-thaw cycles whole waste autoclaved fly ashbrick surface largely intact and average mass and strength of specimen increase,and after experiencing 30 freeze-thaw cycles,themass loss rate and the strength loss rate of brick will be significantly increased; appropriate to increase the aggregate quantity canincrease frost resistance of bricks：calcium carbide slag and fly ash content is too large to tile frost resistance,calcium carbide slagis even more important than fly ash brick on the frost resistance of disadvantage： compared to a short kettle age of brick and age-long brick the latter has better frost resistance property.