[1]丁杨,董晶亮,王中平,等.耐候性试验下泡沫混凝土孔结构与热工性能演变规律[J].中国材料进展,2019,(12):1199-1204.[doi:10.7502/j.issn.16743962.201809006]
　Ding Yang,Dong Jingliang*,Wang Zhongping,et al.Evolution Rule of Pore Structure and Thermal Performance of Foam Concrete under Accelerated Weathering Tests[J].MATERIALS CHINA,2019,(12):1199-1204.[doi:10.7502/j.issn.16743962.201809006]
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耐候性试验下泡沫混凝土孔结构与热工性能演变规律()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2019年第12期
页码:
1199-1204
栏目:
研究报告
出版日期:
2019-12-31

文章信息/Info

Title:
Evolution Rule of Pore Structure and Thermal Performance of Foam Concrete under Accelerated Weathering Tests
文章编号:
16743962(2019)12119906
作者:
丁杨1; 董晶亮2 ; 王中平3 ; 黄神恩3
(1. 浙江大学建筑工程学院，杭州 310058）
(2. 华东交通大学土木建筑学院，南昌 330013)
(3. 同济大学材料科学与工程学院，上海 201804）
Author(s):
Ding Yang1; 2 ;  Dong Jingliang2*;  Wang Zhongping3;  Huang Shenen3
(1.School of Architecture Engineering, Zhejiang University, Hangzhou 310058, China)
(2.School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China)
(3.School of Materials Science and Engineering, Tongji University, Shanghai 201804, China)
关键词:
泡沫混凝土; 耐候性试验; 孔结构; 热工性能
Keywords:
foamed concrete;  weathering test;  pore structure;  thermal conductivity
分类号:
TQ02；TU528.2
DOI:
10.7502/j.issn.16743962.201809006
文献标志码:
A
摘要:
为明确泡沫混凝土现浇屋面保温系统耐候性能的影响因素，对泡沫混凝土分别展开了湿热循环、干湿循环、高低温循环、冻融循环和多场耦合循环5种耐候性试验，通过分析泡沫混凝土孔结构、体积吸水率和导热系数变化率的演变规律揭示其耐候性能。试验结果表明：经过112次湿热循环试验后，泡沫混凝土的体积吸水率仅增长了1.77%，导热系数降低了6%；经过112次干湿循环试验，泡沫混凝土的体积吸水率由20.64%增长到25.63%，导热系数由0.0724增长到0.0836 W/(m·K)，涨幅15.47%；经过112次高低温循环试验，泡沫混凝土的体积吸水率由21.13%增长到25.14%，导热系数增大了6..68%；经过112次冻融循环试验，泡沫混凝土体积吸水率由23.97%增长到29.38%，导热系数由0.0789上升至0.0980 W/(m·K)，增长了24.21%；而经过112次多场耦合试验，泡沫混凝土的体积吸水率由14.12%增长到16.88%，导热系数从0.0720增长到0.0850 W/(m·K)，增幅18.06%。经过干湿循环、高低温循环、冻融循环和多场耦合循环4种耐候性试验后，泡沫混凝土中的泡孔破裂倒塌严重，板材开裂溃散，导致其保温隔热性能下降、体积吸水率升高。而泡沫混凝土具有很好的耐湿热老化性能，经过湿热循环试验后，其孔结构、体积吸水率和导热系数均没有发生显著变化。
Abstract:
In order to understand the affect factors of weathering resistance of foam concrete cast-in-place roof insulation system, five accelerated weathering tests of foam concrete were carried out, including humid-heat cycle, dry-wet cycle, high-low temperature cycle, freeze-thaw cycle and multi-field coupling cycle. By analyzing the evolution rule of its pore structure, volume water absorption and thermal conductivity, the weathering resistance of foam concrete was revealed. The results show that the volume water absorption of foam concrete increases only 1.77% and its thermal conductivity decreases by 6% after 112 humid-heat cycles. After 112 dry-wet cycles, the volume water absorption of foam concrete increases from 20.64% to 25.63%, and its thermal conductivity increases from 0.0724 to 0.0836 W/(m·K), which has increased by 15.47%. After 112 high-low temperature cycles, the volume water absorption of foam concrete increases from 21.13% to 2514%, and its thermal conductivity has increased by 6.68%. After 112 freeze-thaw cycles, the volume water absorption of foam concrete increases from 23.97% to 29.38%. Meanwhile, its thermal conductivity increases from 0.0789 to 0.0980 W/(m·K), which has increased by 24.21%. After 112 multi-field coupling cycles, the volume water absorption of foam concrete increases from 14.12% to 16.88%. Its thermal conductivity has increased by 18.06%, which increases from 0.0720 to 0.0850 W/(m·K). Through four kinds of accelerated weathering tests, which are dry-wet cycle, high-low temperature cycle, freeze-thaw cycle and multi-field coupling cycle, the pore structures in foam concrete has broken and collapsed seriously. Furthermore, the foam concrete sheet has cracked and collapsed. Therefore, the thermal insulation performance of foam concrete decreases and its volume water absorption increases. The foam concrete shows good performance in humidheat cycle test. During this process, the pore structure, volume water absorption and thermal conductivity of foam concrete have no significant variation.

备注/Memo

备注/Memo:
收稿日期：20180906修回日期：20181224 基金项目：“十三五”国家重点研发项目（2016YFC0700807）；国家自然科学基金项目（51708220）；校科研启动基金项目（10012003417017）；水利部黄土高原水土流失过程与控制重点试验室开放课题基金资助项目（201806）第一作者：丁杨，男，1992年生，博士研究生 Email:ceyangding@zju.edu.cn 通讯作者：董晶亮，男，1988年生，讲师，硕士生导师， Email:13677089341@163.com
更新日期/Last Update: 2019-11-29