天然火山灰与粉煤灰在碾压混凝土中的协同效能研究  

Cooperative Efficiency Study on Natural Volcanic Ash and Fly Ash in Roller Compacted Concrete

作　　者：闵永涛 曹郎郎 桑超 樊李浩 郑振华 袁晓波 MIN Yongtao;CAO Langlang;SANG Chao;FAN Lihao;ZHENG Zhenhua;YUAN Xiaobo(Power China Northwest Engineering Corporation Limited,Xi'an 710065 China;CCCC Second Highway Engineering Co.Ltd.,Xi'an 710065 China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [2]中交第二公路工程局有限公司,陕西西安710065

出　　处：《红水河》2024年第6期11-16,共6页

摘　　要：笔者以水胶比为0.55的三级配碾压混凝土为研究对象,采用云南大理天然火山灰和粉煤灰作为掺和料,按不同质量比进行复掺,研究其对碾压混凝土拌和物性能、力学性能、抗冻性能、干缩变形性能、绝热温升值的影响。结果表明,与单掺粉煤灰碾压混凝土相比,天然火山灰与粉煤灰的质量比为1∶4和1.75∶3.25时,对混凝土拌和物性能及力学性能影响较小,干缩变形和绝热温升值增加不明显,抗冻性能有所提高;但两者质量比超过2.5∶2.5时,混凝土用水量和引气剂掺量显著增加,凝结时间大幅缩短,后期力学性能下降幅度较大,干缩变形值和绝热温升值呈明显上升趋势。研究结果可为云南大理地区水电站施工提供参考。In this paper the three-grade roller compacted concrete with water-cement ratio of 0.55 is taken as the research object and the natural volcanic ash and fly ash from Dali Yunnan are used as admixtures and they are mixed according to different mass ratios to study their effects on the properties mechanical properties frost resistance shrinkage deformation and adiabatic temperature rise of the roller compacted concrete mixture.The results show that compared with the single-doped fly ash roller compacted concrete when the mass ratio of natural volcanic ash to fly ash is 1∶4 and 1.75∶3.25 it has little effect on the performance and mechanical properties of concrete mixture the increase of dry shrinkage deformation and adiabatic temperature appreciation is not obvious and the frost resistance is improved.However when the mass ratio of the two exceeds 2.5∶2.5 the water consumption of concrete and the amount of air-entraining agent increase significantly the setting time is greatly shortened the mechanical properties decrease greatly in the later stage and the dry shrinkage deformation value and adiabatic temperature rise show a significant upward trend.The research results can provide reference for the construction of hydropower stations in Dali Yunnan.

关 键 词：碾压混凝土 粉煤灰 天然火山灰 协同效能 

分 类 号：TV431[水利工程—水工结构工程]