冻融损伤下钢纤维煤矸石混凝土的毛细吸水性能

Capillary Water Absorption of Steel Fiber Reinforced Coal Gangue Concrete under Freeze-thaw Damage

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。

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 prediction model of the cumulative water absorption height of SFRCGC under the freeze-thaw damage was established. Results showed that the addition of 1. 0% steel fiber added into SFRCGC decreased the mass of water absorption and1. 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 cumulative 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 analysis,which provides reference for the further research on frost resistance of SFRCGC.