[1]贾福萍1,2,崔艳莉3,等.高温作用对大掺量粉煤灰混凝土力学性能影响[J].西安建筑科技大学学报:自然科学版,2011,43(04):581-587.[doi:DOI:10.15986/j.1006-7930.2011.04.022]
 ,,et al.Effects of elevated temperatures on the mechanical propertiesof high fly ash content concret[J].J.Xi’an Univ. of Arch. & Tech.:Natural Science Edition,2011,43(04):581-587.[doi:DOI:10.15986/j.1006-7930.2011.04.022]
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高温作用对大掺量粉煤灰混凝土力学性能影响()
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西安建筑科技大学学报:自然科学版[ISSN:1006-7930/CN:61-1295/TU]

卷:
43
期数:
2011年04期
页码:
581-587
栏目:
出版日期:
2011-08-31

文章信息/Info

Title:
Effects of elevated temperatures on the mechanical properties
of high fly ash content concret
文章编号:
1006-7930(2011)04-0581-07 .
作者:
贾福萍1崔艳莉3孙宜兵2程 勇2
(1.江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221008;
2.中国矿业大学力学与建筑工程学院,江苏徐州221116;3.恒久集团有限公司,江苏徐州221004)
Author(s):
JIA Fu-ping1CUI Yan-li3SUN Yi-bing2CHEN Yong2
(1.Jiangsu Key Laboratory for Environmental Impact and Structural Safety in Civil Engineering,Xuzhou 221008,China;
2.School of Mechanics &Civil Engineering,China University of Mining & Technology,Xuzhou 221116,China;
3.Permanent Co.Ltd,Xuzhou 221004,China)
关键词:
大掺量粉煤灰混凝土(HFCC)高温作用力学性能
Keywords:
high fly ash content concrete (HFCC)elevated temperaturemechanical properties.
分类号:
TU528.1
DOI:
DOI:10.15986/j.1006-7930.2011.04.022
文献标志码:
A
摘要:
研究了高温作用对大掺量粉煤灰混凝土(HFCC)立方体力学性能的影响,探讨了不同加热温度、不同
粉煤灰掺量与HFCC残余强度的关系.将粉煤灰掺量30%、40%和50%的混凝土立方体试块加热至250,
450,550和650℃进行强度测试,并与素混凝土(不掺粉煤灰)试块进行对比.研究结果表明,随着温度升高,
HFCC残余抗压、劈裂抗拉强度均出现明显退化,劈裂抗拉强度退化尤为明显;随着粉煤灰的掺入,粉煤灰掺
量对强度退化率的影响具有复杂性:高温后HFCC抗压强度退化率均低于普通混凝土强度退化率;劈裂抗拉
强度退化率除粉煤灰掺量30%外均低于普通混凝土退化率.在试验基础上建立HFCC高温后立方体残余抗
压强度、残余劈裂抗拉强度与温度、粉煤灰掺量的定量关系,为高温后HFCC材料强度评估及修复提供依据.
Abstract:
In this paper,the effects of elevated temperatures on the mechanical properties of high fly ash content concrete
(HFCC)are presented.The specimens were prepared with three different replacements of cement by fly ash 30%,40%
and 50%and were tested after exposure to elevated temperature 250,450,550and 650℃respectively,compared with
plain Portland concrete.The results showed that as the elevated temperature increases,the residual compressive strength
and the residual tensile strength both apparently decrease and the deterioration of tensile strength was much quicker than
the deterioration in compressive strength.The results also showed the influence of fly ash replacement on the degraded ratio
 of strength is complicated.After an exposure to the elevated temperatures,the degraded ratio of compressive strength
is less than plain ordinary Portland concrete(PC)and one of tensile strength,except 30%fly ash replacement,remains
the same.Based on the experiments,the alternating simulation formula for determining the relationship between residual
strength ratio,elevated temperature and fly ash,the replacement is developed by using regression of results,which provide
 the theoretical basis for the evaluation and repair of HFCC after elevated temperature.

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备注/Memo

备注/Memo:
收稿日期:2010-04-27  修改稿日期:2011-06-25
基金项目:中国高校基本科研业务费专项基金资助(20011QNB20);中国矿业大学青年科研基金资助项目(OB090188);国家大学生
创新实验计划项目资助(091029006);中国矿业大学大学生实践创新训练计划(090207)
作者简介:贾福萍(1973-),女,山西朔州人,副教授,硕士生导师,主要从事特殊环境下混凝土材料性能研究.
更新日期/Last Update: 2015-11-05