| 摘要: |
| 研究了冻融环境中不同掺量和水胶比条件下，活化煤矸石粉（ACGP）对混凝土毛细吸水性能的影响规律；同时结合非饱和毛细理论，建立了活化煤矸石粉混凝土（ACGPC）的相对含水量分布预测模型.结果表明：冻融作用使得ACGPC的累计吸水量及毛细吸水率逐渐增大，抗毛细吸水性能降低，水分侵入深度提高；当ACGP掺量相同时，ACGPC的抗毛细吸水性能随着水胶比的增加而降低；当水胶比一定时，随着ACGP掺量的增加，ACGPC的累计吸水量及毛细吸水率先降后升；ACGP可细化混凝土孔径，当ACGP掺量为20%时效果最为显著. |
| 关键词: 混凝土 煤矸石粉 毛细吸水 冻融环境 预测模型 微观结构 |
| DOI：10.3969/j.issn.1007-9629.2023.05.005 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（51808443）；陕西省自然科学基础研究计划青年项目（2019JQ-131） |
|
| Capillary Water Absorption Properties of Activated Coal Gangue Powder Concrete in Freeze-thaw Environment |
|
GUAN Xiao1, ZHANG Pengxin1, QIU Jisheng1, DING Sha2, LONG Hang1
|
|
1.School of Architecture and Civil Engineering， Xi'an University of Science and Technology， Xi'an 710054， China;2.School of Civil Engineering， Xi'an University of Architecture and Technology， Xi'an 710055， China
|
| Abstract: |
| The effect of activated coal gangue powder （ACGP） on the capillary water absorption property of concrete under different contents and water-binder ratios in freeze-thaw environment was studied， and the prediction model of relative water content distribution of activated coal gangue powder concrete （ACGPC） was established based on unsaturated capillary theory. The results indicate that the freeze-thaw action gradually increases the cumulative water absorption and absorptivity of ACGPC gradually enhances， the capillary water absorption performance reduces and the water intrusion depth increases. With the same content of ACGP， the capillary water absorption resistance of ACGPC lowers with the increase of water-binder ratio. When the water-binder ratio is constant， the cumulative water absorption and capillary absorptivity of ACGPC reduces and then rises with the increase of ACGP， which refines the harmful pores and improves the pore size distribution in concrete at proper content of ACGP， with the most significant effect at 20%. |
| Key words: concrete coal gangue powder capillary water absorption freeze-thaw environment prediction model microstructure |
