[1]陈春红,朱平华,陈世洲.隧道火灾下气凝胶复合混凝土强度经时变化[J].常州大学学报(自然科学版),2020,32(03):86-92.[doi:10.3969/j.issn.2095-0411.2020.03.012]
　CHEN Chunhong,ZHU Pinghua,CHEN Shizhou.Study on Strength Variation of Aerogel Composite Concrete Exposed to Tunnel Fire[J].Journal of Changzhou University(Natural Science Edition),2020,32(03):86-92.[doi:10.3969/j.issn.2095-0411.2020.03.012]
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隧道火灾下气凝胶复合混凝土强度经时变化()
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常州大学学报(自然科学版)[ISSN:2095-0411/CN:32-1822/N]

卷:
第32卷
期数:
2020年03期
页码:
86-92
栏目:
土木工程
出版日期:
2020-05-28

文章信息/Info

Title:
Study on Strength Variation of Aerogel Composite Concrete Exposed to Tunnel Fire
文章编号:
2095-0411(2020)03-0086-07
作者:
陈春红;  朱平华;  陈世洲
(常州大学 环境与安全工程学院, 江苏 常州 213164)
Author(s):
CHEN Chunhong;  ZHU Pinghua;  CHEN Shizhou
(School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China)
关键词:
隧道火灾;  气凝胶砂浆涂层;  自密实混凝土;  强度退化;  冷却方式
Keywords:
tunnel fire;  aerogel mortar coating;  self-compacting concrete;  compressive strength degradation;  cooling method
分类号:
TU 502
DOI:
10.3969/j.issn.2095-0411.2020.03.012
文献标志码:
A
摘要:
为了分析气凝胶砂浆对隧道混凝土的防火隔热效果,研究了隧道火灾下气凝胶复合混凝土强度随时间退化的规律。首先在气凝胶体积掺量为骨料体积的60%条件下制备出具有防火涂层潜力的砂浆,涂覆在自密实高性能混凝土试件上制成气凝胶复合混凝土,按Eurocodes HC曲线升温(10 min达到800 ℃,30 min达到1 200 ℃)对试件进行受火试验,选取8个受火时间和两种冷却方式。结果表明:受火不超过2 h,气凝胶砂浆对试件的保护效果较好,受火2 h后气凝胶砂浆对试件的防火隔热效果开始减弱。自然冷却方式下,相同受火时间时复合试件比未涂敷涂层的试件的剩余强度最高可达2.07倍; 喷淋冷却下,相同受火时间时复合试件比未涂敷涂层的试件的剩余强度最高可达2.89倍。冷却方式对试件受火后的强度退化也有明显影响。受火时间相同时,自然冷却后的剩余强度比喷淋冷却后的高,受火2 h时高了约75%。
Abstract:
In order to analyze the effect of aerogel mortar on fire insulation of tunnel concrete, the law of strength degradation of aerogel composite concrete with duration time in tunnel fire was studied. Firstly, a mortar having the potential of fireproof coating was prepared,and the aerogel volume was 60% of the aggregate volume. The mortar was used as insulation layer and coated on the surface of self-compacting concrete. Thus aerogel composite concrete was made. According to Eurocodes HC curve(800 ℃ in 10 min, 1 200 ℃ in 30 min), the specimens were subjected to fire test. 8 fire duration and two cooling modes were selected in this test. The results show that when exposed to fire for less than 2 hours, the protective effect of aerogel mortar on specimens was obvious, and it began to weaken after 2 hours. Under natural cooling, the residual strength of specimen coated aerogel mortar at the same duration time was 2.07 times higher than that of uncoated specimen. Under spray cooling, the residual strength of specimen coated aerogel mortar could reach 2.89 times higher than that of uncoated specimen. The cooling mode also had an obvious effect on the strength degradation of the specimen. Residual strength of specimen with natural cooling was about 75% higher than that with spray cooling at the same duration time.

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相似文献/References:

[1]夏 群,徐晓岩,朱平华.气凝胶复合SCC隧道火灾剥落与强度退化研究[J].常州大学学报(自然科学版),2017,(06):63.[doi:10.3969/j.issn.2095-0411.2017.06.009]
　XIA Qun,XU Xiaoyan,ZHU Pinghua.Spalling and Strength Degradation of Aerogel Mortar Protected Self-Compacting Concrete Exposed to Tunnel Fire[J].Journal of Changzhou University(Natural Science Edition),2017,(03):63.[doi:10.3969/j.issn.2095-0411.2017.06.009]

备注/Memo

备注/Memo:
收稿日期:2019-10-15。
基金项目:国家自然科学基金资助项目(51678080,51678081)。
作者简介:陈春红(1983—),女,江西吉安人,硕士,讲师。E-mail:chench@cczu.edu.cn
引用本文:陈春红,朱平华,陈世洲. 隧道火灾下气凝胶复合混凝土强度经时变化[J]. 常州大学学报(自然科学版),2020,32(3):86-92.
更新日期/Last Update: 2020-06-11