| 摘要: |
| 设计了不同配合比的页岩陶粒混凝土，观察了600℃高温后不同湿含量（质量分数）页岩陶粒混凝土的爆裂情况，测试了200，400，600，800，1000℃高温后页岩陶粒混凝土的质量损失和相对残余抗压强度.结果表明：随着页岩陶粒掺量的增加，页岩陶粒混凝土高温爆裂率增大；页岩陶粒混凝土湿含量越高，其高温爆裂率越大；掺0.91kg/m3长度为20mm的网状聚丙烯纤维可以使页岩陶粒掺量580kg/m3的全轻混凝土不发生高温爆裂.经历800℃和1000℃高温后，全轻混凝土质量损失比普通混凝土小.随着温度的升高，页岩陶粒混凝土相对残余抗压强度呈下降趋势；页岩陶粒掺量越大，混凝土相对残余抗压强度越大. |
| 关键词: 页岩陶粒混凝土 爆裂 质量损失 相对残余抗压强度 网状聚丙烯纤维 |
| DOI：10.3969/j.issn.1007 9629.2013.05.026 |
| 分类号: |
| 基金项目:北京市自然科学基金重大项目（8100001） |
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| Study on Performance of Shale Ceramsite Concrete afterExposure to High Temperature |
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JIANG Yu chuan1, HUO Da1, TENG Hai wen1, QIAO Yuan2
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1.College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China;2.China Building Material Test & Certification Group Co., Ltd., Beijing 100024, China
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| Abstract: |
| Different mix proportions of shale ceramsite concrete were designed. The spalling of shale ceramsite concretes with different moisture contents(by mass) after exposure to 600℃ was observed. And mass loss and relative residual compressive strength of shale ceramsite concrete after exposure to 200, 400, 600, 800, 1000℃ were tested. The results indicate that the spalling rate of shale ceramsite concrete increases with increasing use level of shale ceramsite in concrete, and the higher the moisture content in shale ceramsite concrete, the higher the spalling rate. The spalling of full lightweight aggregate concrete with 580kg/m3 shale cermasite added is prevented by incorporating 0.91kg/m3 reticular polypropylene fiber of 20mm length. The mass loss of full lightweight aggregate concrete is less than that of ordinary concrete after exposure to 800℃ and 1000℃. As the temperature rises, the relative residual compressive strength of shale ceramsite concrete declines. And the higher the use level of shale ceramsite, the higher the relative residual compressive strength of concrete. |
| Key words: shale ceramsite concrete spalling mass loss relative residual compressive strength reticular polypropylene fiber |
