文章摘要
韦菲飞.蒸养温度对超细粉煤灰砂浆性能的影响研究[J].水泥工程,2024,37(5):91-96
蒸养温度对超细粉煤灰砂浆性能的影响研究
Effect of different steam curing temperatures on ultrafine fly ash-cement mortar
  
DOI：
中文关键词: 超细粉煤灰,蒸汽养护,化学结合水量,TG-DTG
英文关键词: ultrafine fly ash,steam curing, non-evaporation water, TG-DTG
基金项目:
作者单位
韦菲飞 西安建筑科技大学设计研究总院有限公司 
摘要点击次数: 4
全文下载次数: 0
中文摘要:
      为探讨不同蒸养温度下超细粉煤灰（UFA）-水泥砂浆的性能，分别研究了标养200℃、蒸养500℃、600℃和700℃下20%、30%、40%三种UFA掺量对UFA-水泥砂浆的流动性和力学性能的影响，并结合化学结合水量法、热重法（TG-DTG）分析了UFA-水泥复合胶凝材料的水化和UFA的作用效应。结果表明：UFA-水泥砂浆的流动性随UFA掺量的增大而增大；相同掺量下，蒸养与标养相比提高了UFA-水泥砂浆的早期强度；相同温度下500℃和600℃蒸养UFA试件的28 d抗折和抗压强度比纯水泥组低，700℃下UFA-20%的28 d抗折和抗压强度分别为10.0 MPa和53.1 MPa达到最大且高于纯水泥组；与1 d龄期相比，28 d龄期蒸养试件中的UFA参与水化反应明显，不同掺量的平均CH含量约为标养的90%，化学结合水量和热重结果显示蒸养促进了浆体水化程度并提高了UFA颗粒的火山灰活性。
英文摘要:
      To investigate the performance of ultra-fine fly ash （UFA） cement mortar under different steam curing temperatures， the effects of 20%， 30%， and 40% UFA admixtures on the flowability and mechanical properties of UFA cement mortar were studied at standard curing 20 ℃， steam curing 50 ℃， 60 ℃， and 70 ℃， respectively. The hydration and UFA action effects of UFA cement composite cementitious materials were analyzed using chemical combined water content method and thermogravimetric method （TG-DTG）. The results show that the flowability of UFA cement mortar increases with the increase of UFA content; Under the same dosage， steam curing improved the early strength of UFA cement mortar compared to standard curing; The 28 d flexural and compressive strength of UFA specimens steamed at 50 ℃ and 60 ℃ at the same temperature is lower than that of the control group. The 28 d flexural and compressive strength of UFA-20% at 70 ℃ reaches its maximum at 10.0 MPa and 53.1 MPa， respectively， and is higher than that of the control group; Compared with the 1d age group， the UFA in the 28 d age group steam cured specimens participated significantly in the hydration reaction， and steam cured promoted the degree of slurry hydration and increased the volcanic ash activity of UFA particles.
查看全文   查看/发表评论  下载PDF阅读器
关闭