后装拔出法检测纤维水泥砂浆抗压强度试验方法研究
发布时间：2018-08-16 15:54
【摘要】：当前,我国经济保持着快速发展,建筑业处于较快发展进程之中。由于建筑物老化、建筑功能的改变等等,而使建筑物需要进行加固处理。加固领域中,比较经济的、用得比较广泛的加固方法是纤维水泥砂浆加固,然而现场检测加固层的纤维水泥砂浆抗压强度的方法还不成熟,没有统一的标准。为得到一种可靠的现场检测纤维水泥砂浆抗压强度的方法,本文对后装拔出法检测纤维水泥砂浆进行研究,主要研究的内容及结论如下:(1)模拟工程实际加固情况,采用三种常用的纤维水泥砂浆(聚乙烯醇纤维水泥砂浆、聚丙烯纤维水泥砂浆、钢纤维水泥砂浆)分别对素混凝土试件进行加固处理。根据配合比,每种纤维水泥砂浆都配置9个强度等级,即M20、M30、M40、M50、M60、M70、M80、M90、M100。在对素混凝土试件进行加固时,相应地制作立方体试件,立方体试件和加固试件置于相同的环境下进行养护。养护28d后,采用后装拔出法对纤维水泥砂浆加固薄层进行拔出试验。根据极限拔出力代表值与纤维水泥砂浆立方体试件抗压强度代表值之间的关系,进行一元回归分析。经过试验及分析得到三种纤维水泥砂浆的测强公式,即测强曲线。(2)对一元线性拟合的测强公式进行评价,并进行显著性检验。三种纤维水泥砂浆的测强公式相对误差都较小,精确度较高,检验效果显著,其中钢纤维水泥砂浆的测强公式误差最小,检验效果最好。根据试验建立非线性模型,并与线性拟合的结果进行对比分析。在检测纤维水泥砂浆抗压强度的方法中,对后装拔出法和先装拔出法进行对比分析。(3)分析后装拔出法检测纤维水泥砂浆破坏形态,并从客观和主观两个方面分析影响后装拔出法的因素。(4)后装拔出法检测纤维水泥砂浆抗压强度试验为编制《拔出法检测水泥砂浆和纤维水泥砂浆强度技术规程》标准提供参考,规范和推广在实际工程中采用后装拔出法检测纤维水泥砂浆强度。
[Abstract]:At present, our country economy maintains the fast development, the construction industry is in the fast development process. Due to the aging of buildings, changes in building functions and so on, buildings need to be strengthened. In the field of reinforcement, the more economical and widely used reinforcement method is fiber cement mortar. However, the method to detect the compressive strength of fiber cement mortar in the field is not mature and there is no unified standard. In order to obtain a reliable method for testing the compressive strength of fiber cement mortar in situ, this paper studies the post-loading and pull-out method for testing fiber cement mortar. The main contents and conclusions are as follows: (1) simulating the actual reinforcement situation of engineering. Three kinds of fiber cement mortar (polyvinyl alcohol fiber cement mortar, polypropylene fiber cement mortar and steel fiber cement mortar) were used to reinforce the plain concrete specimens. According to the mix ratio, each kind of fiber cement mortar is equipped with 9 strength grades, namely, M20 M30, M40M50, M60, M70, M80, M90 and M100. When the plain concrete specimen is strengthened, the cube specimen is made accordingly, and the cube specimen and the strengthened specimen are maintained in the same environment. After 28 days of curing, the pull-out test of fiber cement mortar reinforced thin layer was carried out by the method of post-loading and pull-out. According to the relationship between the representative value of the ultimate pull-out force and the representative value of the compressive strength of the fiber cement mortar cube specimen, the univariate regression analysis is carried out. Through the test and analysis, three kinds of fiber cement mortar strength measurement formula, I. e., the strength measurement curve. (2) the univariate linear fitting strength measurement formula is evaluated, and the significance test is carried out. The relative error of the three kinds of fiber cement mortar is smaller, the accuracy is higher, and the test effect is remarkable, among which the steel fiber cement mortar has the smallest error and the best test effect. The nonlinear model is established according to the experiment and compared with the results of linear fitting. In the method of testing the compressive strength of fiber cement mortar, the post-loading pull-out method and the first-loading pull-out method are compared and analyzed. (3) the post-loading and pull-out method is used to detect the failure pattern of fiber cement mortar. The factors that affect the post-loading and pull-out method are analyzed from both objective and subjective aspects. (4) the test of compressive strength of fiber cement mortar by post-loading and pull-out method provides a reference for compiling the technical specification for testing the strength of cement mortar and fiber cement mortar by pull-out method. The strength of fiber cement mortar is tested by post-loading and pullout method in practical engineering.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177.62
[Abstract]:At present, our country economy maintains the fast development, the construction industry is in the fast development process. Due to the aging of buildings, changes in building functions and so on, buildings need to be strengthened. In the field of reinforcement, the more economical and widely used reinforcement method is fiber cement mortar. However, the method to detect the compressive strength of fiber cement mortar in the field is not mature and there is no unified standard. In order to obtain a reliable method for testing the compressive strength of fiber cement mortar in situ, this paper studies the post-loading and pull-out method for testing fiber cement mortar. The main contents and conclusions are as follows: (1) simulating the actual reinforcement situation of engineering. Three kinds of fiber cement mortar (polyvinyl alcohol fiber cement mortar, polypropylene fiber cement mortar and steel fiber cement mortar) were used to reinforce the plain concrete specimens. According to the mix ratio, each kind of fiber cement mortar is equipped with 9 strength grades, namely, M20 M30, M40M50, M60, M70, M80, M90 and M100. When the plain concrete specimen is strengthened, the cube specimen is made accordingly, and the cube specimen and the strengthened specimen are maintained in the same environment. After 28 days of curing, the pull-out test of fiber cement mortar reinforced thin layer was carried out by the method of post-loading and pull-out. According to the relationship between the representative value of the ultimate pull-out force and the representative value of the compressive strength of the fiber cement mortar cube specimen, the univariate regression analysis is carried out. Through the test and analysis, three kinds of fiber cement mortar strength measurement formula, I. e., the strength measurement curve. (2) the univariate linear fitting strength measurement formula is evaluated, and the significance test is carried out. The relative error of the three kinds of fiber cement mortar is smaller, the accuracy is higher, and the test effect is remarkable, among which the steel fiber cement mortar has the smallest error and the best test effect. The nonlinear model is established according to the experiment and compared with the results of linear fitting. In the method of testing the compressive strength of fiber cement mortar, the post-loading pull-out method and the first-loading pull-out method are compared and analyzed. (3) the post-loading and pull-out method is used to detect the failure pattern of fiber cement mortar. The factors that affect the post-loading and pull-out method are analyzed from both objective and subjective aspects. (4) the test of compressive strength of fiber cement mortar by post-loading and pull-out method provides a reference for compiling the technical specification for testing the strength of cement mortar and fiber cement mortar by pull-out method. The strength of fiber cement mortar is tested by post-loading and pullout method in practical engineering.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177.62
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