高掺量粉煤灰大坝混凝土绝热升温试验以及早期开裂性研究  

Adiabatic Heating Test of High Content Fly Ash Dam Concrete and Study on Early Cracking Property

作　　者：曾勇 石远航 Zeng Yong;Shi Yuanhang(Guizhou Water Conservancy Investment Group Co.Ltd.,Guiyang,Guizhou 550000)

机构地区：[1]贵州省水利投资(集团)有限责任公司,贵州贵阳550000

出　　处：《江西建材》2024年第4期49-51,共3页

摘　　要：文中对高掺量粉煤灰大坝混凝土的绝热温升演变规律以及早期开裂敏感性进行分析,并与基准混凝土的温度敏感性和绝热升温性进行对比。结果表明,基准混凝土比高掺量粉煤灰混凝土更快达到温度速率峰值,基准混凝土的温度速率峰值比高掺量粉煤灰混凝土更高。匹配模式下,基准混凝土的开裂温度比高掺量粉煤灰混凝土的温度峰值提高21.6%;绝热模式下,基准混凝土的开裂温度比高掺量粉煤灰混凝土的温度峰值提高20.8%。与基准混凝土相比,高掺量粉煤灰混凝土较慢达到开裂温度,高掺量粉煤灰混凝土的开裂温度较低,即高掺量粉煤灰混凝土的抗开裂性能较强。In this paper,the adiabatic temperature rise evolution law and early cracking sensitivity of high content fly ash dam concrete were analyzed,and the temperature sensitivity and adiabatic heating property were compared with that of benchmark concrete.The results show that the peak temperature rate of reference concrete is faster than that of high-content fly ash concrete,and the peak temperature rate of reference concrete is higher than that of high-content fly ash concrete.In the matching mode,the cracking temperature of the reference concrete is 21.6%higher than the peak temperature of the high-content fly ash concrete.In adiabatic mode,the cracking temperature of the reference concrete is 20.8%higher than that of the high content fly ash concrete.Compared with the reference concrete,the cracking temperature of high-content fly ash concrete is slower,and the cracking temperature of high-content fly ash concrete is lower,that is,the cracking resistance of high-con-tent fly ash concrete is higher.

关 键 词：大坝混凝土 粉煤灰 绝热升温 早期开裂性能 

分 类 号：TV424[水利工程—水工结构工程]