商兴艳,陆洲导

• 1:同济大学结构工程与防灾研究所

摘要(Abstract)：

研究了高温后ECC(经设计的水泥基复合材料)的残余力学性能。将ECC试件分别加热到不同的温度(200、400、600和800℃),保持不同的恒温时间(0.5、1和2 h)。结果表明,试件自然冷却后受压,200℃除外,发现ECC的强度和刚度随温度和恒温时间增加而降低。采用MIP(压汞)试验测试试件的孔结构,发现试件总孔隙率和平均孔径随温度和恒温时间的增加而增加(200℃除外),这很好地解释了火后ECC试件力学性能的变化。

关键词(KeyWords)： ECC;温度;恒温时间;力学性能;孔结构

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51378397,51478362);国家自然科学基金青年基金项目(51408436)

作者(Author): 商兴艳,陆洲导

DOI: 10.13289/j.issn.1009-6264.2015.05.005

参考文献(References)：

• [1]Li V C,Wang S,Wu C.Tensile strain-hardening behavior of polyvinyl alcohol engineered cementitious composite(PVA-ECC)[J].ACI Materials Journal,2001,98(6):483-492.
• [2]Li V C.On engineered cementitious composites(ECC)[J].Journal of Advanced Concrete Technology,2003,1(3):215-230.
• [3]Li V C,Wu C,Wang S,et al.Interface tailoring for strain-hardening polyvinyl alcohol-engineered cementitious composite(PVA-ECC)[J].ACI Materials Journal,2002,99(5):463-472.
• [4]Kunieda M,Rokugo K.Recent progress on HPFRCC in Japan required performance and applications[J].J of Advan Con Tech,2006,4(1):19-33.
• [5]Lepech M D,Li V C.Application of ECC for bridge deck link slabs[J].Materials and Structures,2009,42(9):1185-1195.
• [6]任韦波,许金余,白二雷,等.高温后陶瓷纤维增强地聚物混凝土性能与声学损伤的关系[J].材料热处理学报,2014,35(3):13-19.REN Wei-bo,XU Jin-yu,BAI Er-lei,et al.Relationship between properties and ultrasonic damaged characteristics of ceramic fiber reinforced geopolymeric concrete after heating at elevated temperatures[J].Transactions of Materials and Heat Treatment,2014,35(3):13-19.
• [7]Sakr K,El-Hakim E.Effect of high temperature or fire on heavy weight concrete properties[J].Cement and Concrete Research,2005,35(3):590-596.
• [8]Sahmaran M,Lachemi M,Li V C.Assessing mechanical properties and microstructure of fire-damaged engineered cementitious composites[J].ACI Materials Journal,2010,107(3):297-304.
• [9]Sahmaran M,zbay E,Yücel H E,et al.Effect of fly ash and PVA fiber on microstructural damage and residual properties of engineered cementitious composites exposed to high temperatures[J].Journal of Materials in Civil Engineering,2011,23(12):1735-1745.
• [10]Erdem T K.Specimen size effect on the residual properties of engineered cementitious composites subjected to high temperatures[J].Cement and Concrete Composites,2014,45:1-8.
• [11]Chan S Y N,Luo X,Sun W.Effect of high temperature and cooling regimes on the compressive strength and pore properties of high performance concrete[J].Construction and Building Materials,2000,14(5):261-266.
• [12]Japan Society of Civil Engineers.Recommendations for design and construction of high performance fiber reinforced cement composite with multiple fine cracks(in Japanese)[S].
• [13]ASTM C109/C109M-12.Standard test method for compressive strength of hydraulic cement mortars(using 2-in.or[50-mm]cube specimens)[S].
• [14]Short N R,Purkiss J A,Guise S E.Assessment of fire damaged concrete using colour image analysis[J].Construction and Building Materials,2001,15(1):9-15.
• [15]Sarshar R,Khoury G A.Material and environmental factors influencing the compressive strength of unsealed cement paste and concrete at high temperatures[J].Magazine of Concrete Research,1993,45(162):51-61.
• [16]Dias W P S,Khoury G A,Sullivan P J E.Mechanical properties of hardened cement paste exposed to temperatures up to 700℃(1292F)[J].ACI Materials Journal,1990,87(2):160-166.
• [17]Khoury G A.Compressive strength of concrete at high temperatures:a reassessment[J].Magazine of Concrete Research,1992,44(161):291-309.
• [18]Tailor H F W.Cement Chemistry[M].New York.Academic Press,1990.
• [19]Peng G F,Huang Z S.Change in microstructure of hardened cement paste subjected to elevated temperatures[J].Construction and Building Materials,2008,22(4):593-599.
• [20]Rostasy F S,WeiβR,Wiedemann G.Changes of pore structure of cement mortars due to temperature[J].Cement and Concrete Research,1980,10(2):157-164.

文章评论(Comment)：