水泥混凝土热应变及干缩应变的现场测试
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摘要
通过分析水泥混凝土的时间依赖变形原理和设计无应力圆筒,提出了一种温湿度耦合作用下水泥混凝土膨胀系数及干缩系数的测试方法,对干缩系数进行了理论推导计算。在实际路面中采用此方法埋设相关设备并结合采集的典型数据进行分析。结果表明:此方法得到的水泥混凝土热应变和干缩应变真实可靠,通过数据处理可快速得到其热膨胀系数、线膨胀系数和干缩系数;对于试验段水泥混凝土,得出其热膨胀系数为9.006μm/℃,线膨胀系数为9.305μm/℃,干缩系数为657.7μm;同时,设计的无应力圆筒可以保证测试需要,无孔无应力圆筒内水泥混凝土只经历温度变化,有孔无应力圆筒同时经历温度和湿度作用,筒内外湿度交换良好。
By analyzing the time-dependent deformation principle of cement concrete and designing a particular non-stress cylinder,a method for testing the expansion coefficient and dry shrinkage coefficient of cement concrete with the coupling effect of temperature and humidity is proposed,and the dry shrinkage coefficient is derived and calculated. The relevant device is laid into actual road by the proposed method,and typical data is gathered and analyzed. The result indicates that( 1) the measured thermal strain and dry shrinkage strain obtained by the proposed method is true and reliable,the thermal expansion coefficient,linear expansion coefficient and dry shrinkage coefficient can be obtained quickly after data processing;( 2) the thermal expansion coefficient,linear expansion coefficient and dry shrinkage coefficient of the test road are 9. 006 μm/℃,9. 305 μm/℃,657. 7 μm respectively;( 3) the designed non-stress cylinder can meet the test requirement,the cement concrete in impervious non-stress cylinder experienced only temperature change,while the cement concrete in porous non-stress cylinder experienced both temperature and humidity change,and the humidity exchange inside and outside the cylinder is good.
By analyzing the time-dependent deformation principle of cement concrete and designing a particular non-stress cylinder,a method for testing the expansion coefficient and dry shrinkage coefficient of cement concrete with the coupling effect of temperature and humidity is proposed,and the dry shrinkage coefficient is derived and calculated. The relevant device is laid into actual road by the proposed method,and typical data is gathered and analyzed. The result indicates that( 1) the measured thermal strain and dry shrinkage strain obtained by the proposed method is true and reliable,the thermal expansion coefficient,linear expansion coefficient and dry shrinkage coefficient can be obtained quickly after data processing;( 2) the thermal expansion coefficient,linear expansion coefficient and dry shrinkage coefficient of the test road are 9. 006 μm/℃,9. 305 μm/℃,657. 7 μm respectively;( 3) the designed non-stress cylinder can meet the test requirement,the cement concrete in impervious non-stress cylinder experienced only temperature change,while the cement concrete in porous non-stress cylinder experienced both temperature and humidity change,and the humidity exchange inside and outside the cylinder is good.
引文
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[3]孙仁娟,陈达豪,姚占勇.路面用水泥混凝土膨胀系数测试装置及方法:中国,103558246A[P/OL].2014-02-05[2013-11-08].http://www2.soopat.com/Patent/201310553357.SUN Ren-juan,CHEN Da-hao,YAO Zhan-yong.Device and Method for Testing Expansion Coefficient of Pavement Cement Concrete:China:103558246A[P/OL].2014-02-05[2013-11-08].http://www2.soopat.com/Patent/201310553357.
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[9]蔡安兰.高性能水泥干缩的测试方法及机理研究[D].南京:南京工业大学,2006.CAI An-lan.Research on Dry Shrinkage Test Method and Mechanism of High Performance Concrete[D].Nanjing:Nanjing University of Technology,2006.
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[12]陈辉.水泥基材料的自收缩与热膨胀系数综述[J].混凝土世界,2016(10):48-51.CHEN Hui.Review of Self-shrinkage and Thermal Expansion Coefficient of Cement Based Materials[J].China Concrete,2016(10):48-51.
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[14]JTG E30—2005,公路工程水泥及水泥混凝土试验规程[S].JTG E30—2005,Test Methods of Cement and Concrete for Highway Engineering[S].
[15]陈波,丁建彤,蔡跃波,等.基于温度-应力试验的混凝土早龄期应变分离及热膨胀系数计算[J].水利学报,2016,47(4):560-565.CHEN Bo,DING Jian-tong,CAI Yue-bo,et al.Strain Separation and Thermal Coefficient Calculation of Early Age Concrete Based on Thermal Stress Test[J].Journal of Hydraulic Engineering,2016,47(4):560-565.
[16]胡力群,沙爱民.半刚性基层材料温缩系数测定影响因素研究[J].公路交通科技,2007,24(1):17-20.HU Li-qun,SHA Ai-min.Research on Influence Factor in Semi-rigid Base Course Material Temperature Shrinkage Coefficient Test Using Strain Gauge[J].Journal of Highway and Transportation Research and Development,2007,24(1):17-20.
[17]刘朝晖,王骁帆,李盛,等.温缩和干缩对连续配筋混凝土路面纵向配筋的影响[J].中国公路学报,2016,29(11):1-9.LIU Zhao-hui,WANG Xiao-fan,LI Sheng,et al.Influences of Thermal and Drying Shrinkages on Longitudinal Reinforcement in Continuously Reinforced Concrete Pavement[J].China Journal of Highway and Transport,2016,29(11):1-9.
[18]王艳,倪富健,李再新.水泥稳定碎石基层收缩性能影响因素试验研究[J].公路交通科技,2007,24(10):30-34.WANG Yan,NI Fu-jian,LI Zai-xin.Test Research on Influential Factor for Shrinkage Performance of Cementtreated Macadam Base[J].Journal of Highway and Transportation Research and Development,2007,24(10):30-34.
[2]王鹏,范磊,崔璨.温度膨胀系数对刚性路面设计的影响分析[J].郑州大学学报:工学版,2014,35(2):6-9.WANG Peng,FAN Lei,CUI Can.Effects Analysis of CTE on the PCC Pavement Design[J].Journal of Zhengzhou University:Engineering Science Edition,2014,35(2):6-9.
[3]孙仁娟,陈达豪,姚占勇.路面用水泥混凝土膨胀系数测试装置及方法:中国,103558246A[P/OL].2014-02-05[2013-11-08].http://www2.soopat.com/Patent/201310553357.SUN Ren-juan,CHEN Da-hao,YAO Zhan-yong.Device and Method for Testing Expansion Coefficient of Pavement Cement Concrete:China:103558246A[P/OL].2014-02-05[2013-11-08].http://www2.soopat.com/Patent/201310553357.
[4]张艳聪,田波,彭鹏,等.水泥混凝土线膨胀系数试验研究[J].公路,2011(9):201-205.ZHANG Yan-cong,TIAN Bo,PENG Peng,et al.Experiment and Study on Coefficient of Thermal Expansion of Cement Concrete[J].Highway,2011(9):201-205.
[5]梁立军.水泥混凝土干缩性能影响因素及减小措施研究[J].交通世界,2008(7):122-123.LIANG Li-jun.Research on Influencing Factors of Dry Shrinkage Performance of Cement Concrete and Reduce Measures[J].Transpoworld,2008(7):122-123.
[6]李松,侯相琛,李新凯.基于AASHTO试验方法的水泥混凝土热膨胀系数研究[J].中外公路,2012,32(5):272-275.LI Song,HOU Xiang-chen,LI Xin-kai.Thermal Expansion Coefficient of Cement Concrete Based on ASHHTO Test Method[J].Journal of Foreign and China Highway,2012,32(5):272-275.
[7]朱生盛,杨大志,秦永昊.水泥混凝土路面温度应力影响因素的有限元分析[J].公路工程,2013,38(1):122-123.ZHU Sheng-sheng,YANG Da-zhi,QIN Yong-hao.Finite Element Analysis of Influence Factor of Temperature Stress of Cement Concrete Road[J].Highway Engineering,2013,38(1):122-123.
[8]高原.干湿环境下混凝土收缩与收缩应力研究[D]北京:清华大学,2013.GAO Yuan.Research on Shrinkage and Shrinkage Stress of Concrete in Dry-wet Environment[D].Beijing:Tsinghua University,2013.
[9]蔡安兰.高性能水泥干缩的测试方法及机理研究[D].南京:南京工业大学,2006.CAI An-lan.Research on Dry Shrinkage Test Method and Mechanism of High Performance Concrete[D].Nanjing:Nanjing University of Technology,2006.
[10]CHOI S,WON M C.Thermal Strain and Drying Shrinkage of Concrete Structures in the Field[J].ACI Materials Journal,2010,107(5):498-507.
[11]宋少民,王林.混凝土学[M].武汉:武汉理工大学出版社,2013.SONG Shao-min,WANG Lin.Concrete Technology[M].Wuhan:Wuhan University of Technology Press,2013.
[12]陈辉.水泥基材料的自收缩与热膨胀系数综述[J].混凝土世界,2016(10):48-51.CHEN Hui.Review of Self-shrinkage and Thermal Expansion Coefficient of Cement Based Materials[J].China Concrete,2016(10):48-51.
[13]JTG D4—2011,公路水泥混凝土路面设计规范[S].JTG D4—2011,Specifications for Design of Highway Cement Concrete Pavement[S].
[14]JTG E30—2005,公路工程水泥及水泥混凝土试验规程[S].JTG E30—2005,Test Methods of Cement and Concrete for Highway Engineering[S].
[15]陈波,丁建彤,蔡跃波,等.基于温度-应力试验的混凝土早龄期应变分离及热膨胀系数计算[J].水利学报,2016,47(4):560-565.CHEN Bo,DING Jian-tong,CAI Yue-bo,et al.Strain Separation and Thermal Coefficient Calculation of Early Age Concrete Based on Thermal Stress Test[J].Journal of Hydraulic Engineering,2016,47(4):560-565.
[16]胡力群,沙爱民.半刚性基层材料温缩系数测定影响因素研究[J].公路交通科技,2007,24(1):17-20.HU Li-qun,SHA Ai-min.Research on Influence Factor in Semi-rigid Base Course Material Temperature Shrinkage Coefficient Test Using Strain Gauge[J].Journal of Highway and Transportation Research and Development,2007,24(1):17-20.
[17]刘朝晖,王骁帆,李盛,等.温缩和干缩对连续配筋混凝土路面纵向配筋的影响[J].中国公路学报,2016,29(11):1-9.LIU Zhao-hui,WANG Xiao-fan,LI Sheng,et al.Influences of Thermal and Drying Shrinkages on Longitudinal Reinforcement in Continuously Reinforced Concrete Pavement[J].China Journal of Highway and Transport,2016,29(11):1-9.
[18]王艳,倪富健,李再新.水泥稳定碎石基层收缩性能影响因素试验研究[J].公路交通科技,2007,24(10):30-34.WANG Yan,NI Fu-jian,LI Zai-xin.Test Research on Influential Factor for Shrinkage Performance of Cementtreated Macadam Base[J].Journal of Highway and Transportation Research and Development,2007,24(10):30-34.