冻融损伤下钢纤维煤矸石混凝土的毛细吸水性能

摘要

The influence of freeze-thaw damage on the capillary water absorption of steel fiber reinforced coal gangue concrete ( SFRCGC) was studied through the freeze-thaw test and water absorption test.The effects of steel fiber volume fraction and frost damage on the capillary water absorption of SFRCGC were analyzed, and the predic-tion model of the cumulative water absorption height of SFRCGC under the freeze-thaw damage was established.Re-sults showed that the addition of 1.0%steel fiber added into SFRCGC decreased the mass of water absorption and 1.5%, 0.5%steel fiber added increased the mass of water absorption compared with that of 0%steel fiber added when there is no frost damage; when the frost damage exists, 1.0% steel fiber added into SFRCGC leads to the lowest mass of water absorption besides that of 0%steel fibers added.1.0%steel fiber performs better.The cumu-lative water absorption height increases linearly with the increase of freeze-thaw damage.The predict model of the cumulative water absorption height of SFRCGC under the freeze-thaw damage was established by regression analy-sis, which provides reference for the further research on frost resistance of SFRCGC.%通过冻融循环试验和毛细吸水试验,开展了冻融损伤对钢纤维煤矸石混凝土(SFRCGC)毛细吸水的影响研究,分析了钢纤维掺量和冻融循环次数对SFRCGC毛细吸水性能的影响,建立了冻融损伤下SFRCGC累积毛细吸水高度预测模型.研究结果表明:不考虑冻融损伤时,与未掺加钢纤维的煤矸石混凝土相比,1.0%钢纤维掺量对SFRCGC的累积毛细吸水质量有明显的减少作用,而1.5%和0.5%钢纤维掺量加大了SFRCGC的吸水质量;考虑冻融损伤时,1.0%钢纤维掺量SFRCGC的吸水质量仅次于0%钢纤维掺量;1.0%钢纤维掺量效果较好.此外,随着冻融损伤的增加SFRCGC的累积毛细吸水高度近似呈线性增加.利用回归分析建立了冻融损伤下SFRCGC的累积毛细吸水高度预测模型,可为SFRCGC抗冻性的进一步研究提供参考.