文章摘要
董双快, 吴福飞, 王 丹, 陈 聪, 郭 爽, 陈亮亮, 叶鸿宏.贵州地区粉煤灰种类对长龄期砂浆力学性能与孔隙率的影响Journal of Water Resources and Water Engineering[J].,2020,31(6):180-186
贵州地区粉煤灰种类对长龄期砂浆力学性能与孔隙率的影响
Effects of different fly ash on the mechanical properties and porosity of long-age mortar in Guizhou region
  
DOI:10.11705/j.issn.1672-643X.2020.06.28
中文关键词: 粉煤灰  长龄期砂浆  力学性能  吸水率  孔隙率
英文关键词: fly ash  long-age mortar  mechanical properties  water absorption  porosity
基金项目:贵州省教育厅青年科技人才成长项目(黔教合KY字[2018]125号);贵州科技厅-贵州师范大学联合基金项目(黔科合LH字[2017] 7351号);贵州师范大学 2016 年博士科研启动项目(0517073); 贵州省科学技术基金项目(黔科合 LH字[2014]7046号);贵州省科学技术基金项目(黔科合 J字LKS[2013]41号)
Author NameAffiliation
DONG Shuangkuai1, WU Fufei1, WANG Dan1, CHEN Cong1, GUO Shuang1, CHEN Liangliang2, YE Honghong3 (1.贵州师范大学 贵州 贵阳 550025 2.重庆水利电力职业技术学院 重庆 4021603.中建西部建设贵州有限公司 贵州 贵阳 550004) 
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中文摘要:
      为了区别不同电厂Ⅱ级粉煤灰对长龄期砂浆性能的影响作用,采用贵州地区常见的4种粉煤灰(鸭溪、大方、六盘水和都匀Ⅱ级粉煤灰),探索各粉煤灰对长龄期砂浆力学性能、孔隙率、吸水率和微观形貌的影响。结果表明:粉煤灰等质量替代水泥后,有利于提高长龄期砂浆的抗折强度和抗压强度,最大分别增大了94.6%和52.1%(鸭溪)、71.6%和49.5%(大方),100.0%和92.0%(六盘水)以及51.8%和47.6%(都匀);粉煤灰的掺量越大,砂浆的抗折强度和抗压强度的增加速率越大,孔隙率的降低幅度越大,分别为29.7%(六盘水)、40.0%(鸭溪)、28.7%(都匀)和34.9%(大方),同时,4种粉煤灰砂浆的最大吸水率分别降低了21.6%(六盘水)、44.0%(都匀)、39.8%(鸭溪)和38.9%(大方);综合分析发现,养护1 000 d后,粉煤灰仍主要发挥填充作用和火山灰效应,其中活性较低的粉煤灰仍以填充作用为主。
英文摘要:
      To distinguish the effect of gradeⅡfly ash from different power plants on the performance of long-age mortar, we used four kinds of commonly used fly ash in Guizhou region (from Yaxi, Dafang, Liupanshui and Douyun) to explore the influence of different fly ash on the mechanical properties, porosity, water absorption and microstructure of long-age mortar. The results show that the flexural strength and compressive strength of long-age mortar improved by 94.6% and 52.1% (Yaxi), 71.6% and 49.5% (Dafang), 100.0% and 92.0% (Liupanshui) and 51.8% and 47.6% (Douyun) respectively, after the replacement of cement with fly ash of equal amount from those regions. The greater the content of fly ash, the greater the increase of the flexural strength and compressive strength of mortar, and the greater the decrease of porosity, which was 29.7%(Liupanshui), 40.0%(Yaxi), 28.7%(Duyun) and 34.9%(Dafang), respectively. Maximum water absorption of these four kinds of fly ash mortar reduced by 21.6%(Liupanshui), 44.0%(Douyun), 39.8%(Yaxi)和38.9%(Dafang), respectively. Comprehensive analysis found that, after curing for 1 000 days, fly ash was still active in the mortar performing filling and pozzolanic effect, among which that with lower activity mostly had a filling effect on the porosity of mortar.
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