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超声—回弹综合法检测青岛地区混凝土抗压强度的应用技术研究

发布时间:2019-02-11 11:39
【摘要】:随着建筑工程质量检测技术的日趋完善,建筑工程施工质量验收统一标准中的十六字指导思想“验评分离,强化验收,完善手段,过程控制”在工程中的具体应用得以实现。“完善手段”这一指导思想在工程质量验收中也就显示出越来越重要的的位;用科学的检测数据来判断,避免减少人为因素的干扰和主观评价的影响,同时建立规范的“平行检查”中增加检测手段控制,为工程质量验收、结构完整和使用功能的完善提供保证。回弹法只能测得混凝土表层的强度,内部情况却无法得知,当混凝土的强度较低时,其塑性变形较大,此时回弹值与混凝土表层强度之间的变化关系不太明显;超声波在混凝土中的传播速度可以反映混凝土内部的强度变化,但对强度较高的混凝土,波速随强度的变化不太明显。若将回弹法、超声波法两种方法结合,互相取长补短,通过实验建立超声波波速-回弹值-混凝土强度之间的相关关系,用双参数来评定混凝土的强度,即为超声-回弹综合法。超声法检测混凝土强度充分反映了超声波历程上混凝土内部材料的平均强度,而回弹法的回弹值仅反映了结构混凝土表面层的材料强度。超声法和回弹法检测结构混凝土强度的测量值是可以互相补偿的,消除碳化因素的影响。试验证明:超声-回弹综合法检测结构和构件混凝土强度的精确度和可靠性要高于单一的超声法或回弹法。因此,在混凝土构件的质量控制及检测结构和构件混凝土强度中得到广泛的应用。综合法正是利用了两种对构件损伤最小,一个利用构件内部的物理指标,一个从表面硬度着手,起到由表至内多侧面综合反应混凝土抗压强度,正因为是多侧面反应混凝土强度指标,故有较好的相关性。通过实验建立超声波波速--回弹值—混凝土强度之间用来检测普通-高强混凝土强度的相关关系方程式,开创性地采用高强回弹仪用双参数来评定普通-高强混凝土的抗压强度,为实际工程现场检测普通-高强混凝土提供了一种较为先进、可靠的检测方法.因此,本研究通过试验建立了用超声-回弹综合法测定普通-高强混凝土强度的专门曲线(相关关系方程式),并制备了与结构实体一致的同条件养护试块,因此,得到的相关关系方程式具有较强实用性,利用该相关关系方程式能较准确地推算结构实体的强度。
[Abstract]:With the improvement of construction engineering quality inspection technology, the concrete application of 16-word guiding ideology in the unified standard of construction quality acceptance of construction engineering, such as "score separation, strengthen acceptance, perfect means and process control", has been realized. The guiding ideology of "perfect means" is more and more important in the acceptance of engineering quality. Scientific test data are used to judge and avoid the interference of human factors and the influence of subjective evaluation. At the same time, the standard "parallel inspection" is established to increase the control of testing means for the acceptance of engineering quality. Complete structure and perfect function provide guarantee. The rebound method can only measure the strength of the surface layer of concrete, but the internal situation can not be known. When the strength of concrete is low, the plastic deformation of concrete is larger, and the relationship between the rebound value and the strength of the surface layer of concrete is not obvious. The velocity of ultrasonic wave propagation in concrete can reflect the change of strength inside the concrete, but for the concrete with high strength, the change of wave velocity with strength is not obvious. If the springback method and ultrasonic method are combined to complement each other, the correlation between ultrasonic wave velocity, rebound value and concrete strength is established through experiments, and the strength of concrete is evaluated with two parameters. That is ultrasonic-springback synthesis method. Ultrasonic testing of concrete strength fully reflects the average strength of concrete internal materials in ultrasonic history, while the rebound value of springback method only reflects the material strength of the surface layer of structural concrete. The measured values of ultrasonic and springback methods can compensate each other and eliminate the influence of carbonation factors. The test results show that the accuracy and reliability of the ultrasonic and springback comprehensive method for detecting the strength of structure and member concrete is higher than that of the single ultrasonic method or springback method. Therefore, it is widely used in the quality control of concrete members and the detection of concrete strength. The synthetic method uses two kinds of the least damage to the members, one is the physical index of the component, the other is from the surface hardness to the comprehensive reaction concrete compressive strength from the surface to the inside. Because it is a multi-side concrete strength index, so there is a good correlation. The correlation equation between ultrasonic wave velocity, springback value and concrete strength is established by experiment to detect the strength of ordinary high strength concrete. The compressive strength of ordinary high strength concrete is evaluated by using the high strength resilience instrument with two parameters, which provides a more advanced and reliable testing method for common high strength concrete in practical engineering field. Therefore, in this study, a special curve (correlation equation) was established to determine the strength of ordinary high strength concrete by ultrasonic rebound synthesis method, and the same condition curing test block was prepared in accordance with the structural entity. The correlation relation equation is practical, and the strength of the structure can be calculated more accurately by using the correlation equation.
【学位授予单位】:青岛理工大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TU528

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