纤维水泥砂浆用先装拔出法检测抗压强度的方法研究

发布时间：2018-01-16 04:29

本文关键词：纤维水泥砂浆用先装拔出法检测抗压强度的方法研究　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：纤维水泥砂浆(主要包括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)作为一种新型加固材料已在工程加固领域得到了广泛的应用。但行业内目前尚没有用于纤维水泥砂浆抗压强度现场检测的方法及标准。为选择一种操作简便、准确率高的方法来现场检测纤维水泥砂浆抗压强度,本文对先装拔出法的应用进行了试验研究。本文采用先装拔出法对用于混凝土加固的聚乙烯醇纤维水泥砂浆、聚丙烯纤维水泥砂浆、钢纤维水泥砂浆等三种纤维水泥砂浆的抗压强度的现场检测进行试验研究。试验分别制作强度等级分别为C15、C20、C30、C40、C50的素混凝土试块,配制了M20、M30、M40、M50、M60、M70、M80、M90、M100共9个强度等级的三种纤维水泥砂浆。考虑加固工程实际,对其进行分组。通过对标准立方体砂浆试块和混凝土试件纤维水泥砂浆加固薄层分别进行立方体抗压强度试验和先装拔出试验,得到相关试验数据。利用最小二乘法对试验数据进行线性方程拟合,最终得到三种纤维水泥砂浆的测强公式,然后对测强公式进行回归分析、显著性检验,对整个测强公式进行区间估计。分析结果显示,先装拔出力与立方体抗压强度之间有很好的线性相关性,三条测强公式可以用于实际工程中纤维水泥砂浆抗压强度的现场检测。先装拔出法检测纤维水泥砂浆抗压强度具有精度高、速度快、破损小、对结构主体安全影响很小等优点,且操作简单、机具轻便、节省费用,在加固工程实际中具有广泛的应用前景,为钢筋网纤维水泥砂浆加固现场检测纤维水泥砂浆加固薄层抗压强度提供了可行的方法,本文的研究为先装拔出法检测纤维水泥砂浆抗压强度的标准制订提供了试验依据。
[Abstract]:Fiber cement mortar (mainly including polyvinyl alcohol fiber cement mortar, polypropylene fiber cement mortar. Steel fiber cement mortar). As a new reinforcement material, it has been widely used in the field of engineering reinforcement. However, there is no method and standard for field testing of compressive strength of fiber cement mortar. High accuracy method to detect the compressive strength of fiber cement mortar in situ. In this paper, the application of preloading and pull-out method is studied. In this paper, the polyvinyl alcohol fiber cement mortar and polypropylene fiber cement mortar used for concrete reinforcement are studied. The field test of compressive strength of three kinds of fiber cement mortar, such as steel fiber cement mortar, was carried out. The M20 M30 M40M50 M60M70 M80M90 was prepared for the plain concrete test block of C50. M100 three kinds of fiber cement mortar with 9 strength grades. Through the standard cube mortar test block and the concrete specimen fiber cement mortar reinforcement thin layer respectively carries on the cube compressive strength test and the first pack out test. Using the least square method to fit the test data with linear equation, finally three fiber cement mortar strength measurement formulas are obtained, and then the regression analysis of the strength measurement formula is carried out to test the significance. The analysis results show that there is a good linear correlation between the first pull-out force and the compressive strength of the cube. The three formulas of strength measurement can be used in the field testing of the compressive strength of fiber cement mortar in practical engineering. The test of fiber cement mortar compressive strength by first loading and drawing method has high precision, fast speed and little damage. It has the advantages of little influence on the safety of the main body of the structure, simple operation, portable machines and tools, and low cost, so it has a wide application prospect in the practice of reinforcement engineering. It provides a feasible method for testing the compressive strength of the thin layer strengthened by fiber reinforced cement mortar. The research in this paper provides the experimental basis for determining the compressive strength of fiber cement mortar by preloading and pull-out method.
【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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