混杂纤维混凝土高温和碳化性能试验研究
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摘要
混杂纤维混凝土是在混凝土中均匀地加入两种或两种以上不同纤维而形成的,它是纤维混凝土领域中颇有发展前景的一个新兴分支,是当今纤维混凝土界研究的热点和重点课题。随着纤维混凝土大量应用于实际工程,不可避免的将面临结构的火灾、耐久性等技术问题。因此,研究和掌握混杂纤维混凝土的基本性能及其技术特征,对混杂纤维混凝土更好应用于实际工程有着重要的现实意义。
本文以“国家混凝土规范第6批科研课题[GBKY6001]”、“华侨大学高层次人才科研基金[05BS303]”和“校企合作重点公关项目[HQ09- 02]”为依托,采取试验研究与理论分析相结合的方法,通过对基准混凝土、单掺钢纤维混凝土、单掺聚丙烯纤维混凝土及其混掺混凝土,分别在经常温标准条件、高温条件和碳化条件后进行研究,主要研究内容和主要结果如下:
1.研究了不同混杂类型纤维混凝土力学性能,得出混杂纤维对混凝土的增韧增强存在一个最佳掺量;对比基准混凝土,可知混杂纤维混凝土有良好的增强增韧效果;介绍了混杂纤维混凝土的混杂系数,通过混杂系数定量评价了混杂纤维的增强增韧效果。
2.分析了不同混杂类型纤维混凝土高温后抗压强度的变化规律,详细描述了混杂纤维混凝土不同等级高温作用后的表观现象,同时分析了混杂纤维混凝土高温后的质量损失,并回归了残余抗压强度与过火温度及质量损失与过火温度的关系曲线;从微观机理上论述了混杂纤维混凝土良好的抗爆裂性能。
3.利用超声回弹检测技术对高温后的不同混杂类型纤维混凝土进行检测,提出了的超声波速与残余抗压强度的回归方程、回弹值与残余抗压强度的回归方程以及超声波速回弹值综合与残余抗压强度的回归方程,可用于直接估算火灾建筑物的混凝土的残余抗压强度及损伤程度,有利于火灾后的重建工作。
4.利用红外热像检测技术对高温后的不同混杂类型纤维混凝土进行检测,给出了热像平均温升与强度损失的回归方程,可以估算火灾建筑物的混凝土的残余抗压强度及损伤程度,更好地评估火灾结构损伤情况,做出更好的修复方案。
5.建立了混杂纤维混凝土高温后性能评价体系,可以对火灾建筑的混杂纤维混凝土的过火温度、残余抗压强度及其损伤温度做出评估,为火灾混杂纤维混凝土结构的修复与加固提供依据。
6.研究了不同混杂类型纤维混凝土碳化后力学性能,得出抗压强度、劈拉强度随碳化龄期的变化规律,同时分析了碳化深度跟碳化龄期的关系,对比基准混凝土,表明混杂纤维混凝土有良好的抗碳化能力,并从微观上阐明了混杂纤维混凝土的抗碳化机理。
7.总结了混凝土的不同碳化深度模型,并比较各种模型的适用情况;同时给出了不同混杂类型纤维混凝土碳化深度模型,为预测混杂纤维混凝土的碳化深度提供了一定依据。
本文在多工况条件下对多种混杂类型的纤维混凝土进行系列试验与研究,得到相应的结果和具有一定理论和工程应用价值的技术指标及重要规律,这将为对混杂纤维混凝土的进一步研究和推广应用奠定基础。
Hybrid fiber concrete is got by distributing two or more kinds of fibers into concrete. It has become a new branch with good future in the fiber concrete, and is a highlight hot spot issue of the present fiber concrete study. As the application of fiber concrete into engineering, the fire and durability become the inevitable problems. For these reasons, the research on the fundamental characters and mechanical property of fiber concrete has realistic significance for its application into engineering.
Based on the background of‘The Six Group Researching Subject of National Concrete Code Project[GBKY600]’,‘Scientific Research Found of Person with Excellent Ability of Huaqiao University[05BS303]’and Sponsored by the school-enterprise cooperation research under Grant NO.[ HQ09-02], a method combining both the test research and theoretical analysis was applied. The basic concrete, steel fiber concrete, polypropylene fiber and hybrid fiber concrete were tested under normal temperature and abnormal high temperature and carbonization condition. The main research contents and test results are as follows:
1、Studying the mechanical property of different hybrid fiber concrete, it was founded that there is an optimum mixing amount of hybrid fiber concrete for toughening and reinforcing concrete. And comparing to the base concrete, the hybrid fiber concrete showed good toughing and strengthening performance. A hybrid coefficient was defined to evaluate the toughing and strengthening performance.
2、The variation of compressive strength of different hybrid fiber concrete after high temperature was analyzed. The performance of hybrid fiber concrete under different high temperature was described in detail. The mass loss of hybrid fiber concrete through high temperature was studied, and the relation curves of remain compressive strength and burned temperature、mass loss and burned temperature were regressed. From microscopic mechanism, the antiknock property of hybrid concrete was analyzed.
3、Detecting the concrete with different hybrid fiber through high temperature by ultrasonic-rebound method, three regression equations, for ultrasonic velocity and the concrete compressive strength remains, the rebound value and the concrete compressive strength remains, the ultrasonic velocity with ultrasonic velocity complex and compressive strength remains were all proposed. The equations can be used to evaluate the concrete compressive strength remains of fired construction to determine the fire damage and make for the reconstruction.
4、Detecting the concrete with different hybrid fiber through high temperature by infrared thermal images technique, the regression equation for thermal images average temperature rising, the concrete burned temperature and strength loss was proposed. The equation can be used to evaluate the concrete compressive strength remains of fired construction to determine the fire damage and make a better rehabilitation design.
5、An evaluation system for property of hybrid fiber concrete through high temperature was established, which can evaluate the burned temperature, compressive strength remains and damaged temperature of the hybrid fiber concrete to provide basis for the rehabilitation of the hybrid fiber concrete construction damaged by fire.
6、Studying the mechanical property of the concrete with different hybrid fiber after its carbonization, the variation of compressive strength and split strength with carbonization age was obtained. Meanwhile the relation of carbonization depth and carbonization age was also analyzed. Comparing with the basic concrete, the hybrid fiber concrete was proved to have a good resistance to carbonizing. The mechanism of resistance to carbonizing of hybrid fiber concrete was elaborated from microscopic.
7、Analyzing the different models of carbonized depth in concrete and considering the applicable condition, a model of carbonized depth in hybrid fiber concrete was concluded, which provides basis for forecasting the carbonized depth in hybrid fiber concrete.
A series of test were carried out on many kinds of hybrid fiber concrete under different conditions. The test results, technical index and relevant regularity with theoretical and engineering value obtained will certainly lay a solid foundation for the further development and promotion of the hybrid fiber concrete.
本文以“国家混凝土规范第6批科研课题[GBKY6001]”、“华侨大学高层次人才科研基金[05BS303]”和“校企合作重点公关项目[HQ09- 02]”为依托,采取试验研究与理论分析相结合的方法,通过对基准混凝土、单掺钢纤维混凝土、单掺聚丙烯纤维混凝土及其混掺混凝土,分别在经常温标准条件、高温条件和碳化条件后进行研究,主要研究内容和主要结果如下:
1.研究了不同混杂类型纤维混凝土力学性能,得出混杂纤维对混凝土的增韧增强存在一个最佳掺量;对比基准混凝土,可知混杂纤维混凝土有良好的增强增韧效果;介绍了混杂纤维混凝土的混杂系数,通过混杂系数定量评价了混杂纤维的增强增韧效果。
2.分析了不同混杂类型纤维混凝土高温后抗压强度的变化规律,详细描述了混杂纤维混凝土不同等级高温作用后的表观现象,同时分析了混杂纤维混凝土高温后的质量损失,并回归了残余抗压强度与过火温度及质量损失与过火温度的关系曲线;从微观机理上论述了混杂纤维混凝土良好的抗爆裂性能。
3.利用超声回弹检测技术对高温后的不同混杂类型纤维混凝土进行检测,提出了的超声波速与残余抗压强度的回归方程、回弹值与残余抗压强度的回归方程以及超声波速回弹值综合与残余抗压强度的回归方程,可用于直接估算火灾建筑物的混凝土的残余抗压强度及损伤程度,有利于火灾后的重建工作。
4.利用红外热像检测技术对高温后的不同混杂类型纤维混凝土进行检测,给出了热像平均温升与强度损失的回归方程,可以估算火灾建筑物的混凝土的残余抗压强度及损伤程度,更好地评估火灾结构损伤情况,做出更好的修复方案。
5.建立了混杂纤维混凝土高温后性能评价体系,可以对火灾建筑的混杂纤维混凝土的过火温度、残余抗压强度及其损伤温度做出评估,为火灾混杂纤维混凝土结构的修复与加固提供依据。
6.研究了不同混杂类型纤维混凝土碳化后力学性能,得出抗压强度、劈拉强度随碳化龄期的变化规律,同时分析了碳化深度跟碳化龄期的关系,对比基准混凝土,表明混杂纤维混凝土有良好的抗碳化能力,并从微观上阐明了混杂纤维混凝土的抗碳化机理。
7.总结了混凝土的不同碳化深度模型,并比较各种模型的适用情况;同时给出了不同混杂类型纤维混凝土碳化深度模型,为预测混杂纤维混凝土的碳化深度提供了一定依据。
本文在多工况条件下对多种混杂类型的纤维混凝土进行系列试验与研究,得到相应的结果和具有一定理论和工程应用价值的技术指标及重要规律,这将为对混杂纤维混凝土的进一步研究和推广应用奠定基础。
Hybrid fiber concrete is got by distributing two or more kinds of fibers into concrete. It has become a new branch with good future in the fiber concrete, and is a highlight hot spot issue of the present fiber concrete study. As the application of fiber concrete into engineering, the fire and durability become the inevitable problems. For these reasons, the research on the fundamental characters and mechanical property of fiber concrete has realistic significance for its application into engineering.
Based on the background of‘The Six Group Researching Subject of National Concrete Code Project[GBKY600]’,‘Scientific Research Found of Person with Excellent Ability of Huaqiao University[05BS303]’and Sponsored by the school-enterprise cooperation research under Grant NO.[ HQ09-02], a method combining both the test research and theoretical analysis was applied. The basic concrete, steel fiber concrete, polypropylene fiber and hybrid fiber concrete were tested under normal temperature and abnormal high temperature and carbonization condition. The main research contents and test results are as follows:
1、Studying the mechanical property of different hybrid fiber concrete, it was founded that there is an optimum mixing amount of hybrid fiber concrete for toughening and reinforcing concrete. And comparing to the base concrete, the hybrid fiber concrete showed good toughing and strengthening performance. A hybrid coefficient was defined to evaluate the toughing and strengthening performance.
2、The variation of compressive strength of different hybrid fiber concrete after high temperature was analyzed. The performance of hybrid fiber concrete under different high temperature was described in detail. The mass loss of hybrid fiber concrete through high temperature was studied, and the relation curves of remain compressive strength and burned temperature、mass loss and burned temperature were regressed. From microscopic mechanism, the antiknock property of hybrid concrete was analyzed.
3、Detecting the concrete with different hybrid fiber through high temperature by ultrasonic-rebound method, three regression equations, for ultrasonic velocity and the concrete compressive strength remains, the rebound value and the concrete compressive strength remains, the ultrasonic velocity with ultrasonic velocity complex and compressive strength remains were all proposed. The equations can be used to evaluate the concrete compressive strength remains of fired construction to determine the fire damage and make for the reconstruction.
4、Detecting the concrete with different hybrid fiber through high temperature by infrared thermal images technique, the regression equation for thermal images average temperature rising, the concrete burned temperature and strength loss was proposed. The equation can be used to evaluate the concrete compressive strength remains of fired construction to determine the fire damage and make a better rehabilitation design.
5、An evaluation system for property of hybrid fiber concrete through high temperature was established, which can evaluate the burned temperature, compressive strength remains and damaged temperature of the hybrid fiber concrete to provide basis for the rehabilitation of the hybrid fiber concrete construction damaged by fire.
6、Studying the mechanical property of the concrete with different hybrid fiber after its carbonization, the variation of compressive strength and split strength with carbonization age was obtained. Meanwhile the relation of carbonization depth and carbonization age was also analyzed. Comparing with the basic concrete, the hybrid fiber concrete was proved to have a good resistance to carbonizing. The mechanism of resistance to carbonizing of hybrid fiber concrete was elaborated from microscopic.
7、Analyzing the different models of carbonized depth in concrete and considering the applicable condition, a model of carbonized depth in hybrid fiber concrete was concluded, which provides basis for forecasting the carbonized depth in hybrid fiber concrete.
A series of test were carried out on many kinds of hybrid fiber concrete under different conditions. The test results, technical index and relevant regularity with theoretical and engineering value obtained will certainly lay a solid foundation for the further development and promotion of the hybrid fiber concrete.
引文
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