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
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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 
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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.
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