回弹法推定砌体中蒸压粉煤灰砖抗压强度研究

发布时间：2018-02-23 01:55

本文关键词： 回弹法蒸压粉煤灰砖影响因素抗压强度回弹测强曲线　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：改革开放以来,随着保护耕地、建筑节能以及环境保护等政策的实行,非烧结砖的发展日益成熟,回弹法的应用也越来越广泛。回弹法是当下一种常见的现场检测技术方法,即使用一个靠弹簧驱动的弹击锤弹击材料表面,得到并记录回弹值,得到的回弹值用来作为与抗压强度具有相关性的指标用来推定块材抗压强度的一种现场检测技术方法。该检测方法具有检测费用低、可检测范围广和非破损性现场检测等特点。我国的相关部门制定回弹法检测混凝土和烧结砖强度的国家和地方标准,但是,关于回弹法检测非烧结砖的测强公式并未在我国相关标准中给出。我国进入“十二五”规划以来,环境治理问题越来越成为我们关注的焦点问题,同时也是迫切需要解决的问题之一。我国的粉煤灰年排放量有逐年递增的趋势,在早在1994年我国家就颁布了《粉煤灰综合利用管理办法》,明确了对粉煤灰的处理过程中采用“以用为主”的指导精神。由于在蒸压粉煤灰砖的制作过程中,影响成品砖的因素较多而各个地区用于制作蒸压粉煤灰砖的原料处理程度和设备水平又参差不齐,给该种砖的性能研究和探索造成了一定的影响。综上所述,建立砌体中蒸压粉煤灰砖湖南地区的回弹测强曲线就显得非常具有必要性。本篇论文通过一系列试验和数据统计分析,采用统计学原理,得到适用于砌体中蒸压粉煤灰砖的湖南地区回弹测强曲线,属于《非烧结砖砌体现场检测技术规程》的系列成果之一。本文所做工作如下:(1)论述了蒸压粉煤灰砖的发展历程、特点以及应用前景,并总结归纳回弹法测定砌体中蒸压粉煤灰砖抗压强度的原理和影响回弹值的主要因素。(2)通过湖南大学制作的的蒸压粉煤灰砖标准试件进行试验,对不同等级的竖向压力、砂浆、试验方法、含水率和碳化深度对于回弹值的影响机理进行了实验研究。(3)通过试验共得到348组回弹值和抗压强度值原始数据,将其进行分组后共得到42组相互匹配的回弹平均值与抗压强度平均值数组。利用Origin软件,按照最小二乘法原理对得到的回弹值-抗压强度匹配数组进行回归拟合,建立以幂函数式表达的适用于蒸压粉煤灰砖的湖南地区回弹测强曲线。验证性实验表明,本文所得到的砌体中蒸压粉煤灰砖湖南地区回弹测强曲线精度较高,可为《非烧结砖砌体现场检测技术规程》的编纂提供试验支持和数据支撑。
[Abstract]:Since the reform and opening up, with the implementation of the policies of protecting cultivated land, building energy saving and environmental protection, the development of non-sintered bricks has become increasingly mature, and the springback method has been used more and more widely. Even if a spring-driven hammer is used to bounce the surface of the material, the springback value is obtained and recorded. The springback value obtained is used as an index related to compressive strength to be used to predict the compressive strength of blocks. The relevant departments of our country have formulated national and local standards for rebound testing of strength of concrete and sintered bricks, but, The formula for measuring the strength of non-sintered bricks by rebound method has not been given in the relevant standards of our country. Since China entered the 12th Five-Year Plan, environmental governance has become the focus of our attention. At the same time, it is one of the urgent problems that need to be solved. The annual emissions of fly ash in China are increasing year by year. As early as 1994, our country promulgated the "Comprehensive Utilization of fly Ash Management method", which made clear the guiding spirit of "using mainly" in the treatment of fly ash. As a result, in the production process of autoclaved pulverized coal brick, There are many factors affecting the finished brick, and the raw material treatment degree and equipment level of the autoclaved fly ash brick are not uniform, which has a certain influence on the research and exploration of the properties of this kind of brick. It is necessary to set up the rebound strength curve of autoclaved pulverized coal brick in Hunan area. This paper adopts the statistical principle through a series of tests and statistical analysis of data. The rebound strength curve of autoclaved pulverized coal brick in Hunan is obtained, which belongs to one of the series of achievements of "technical specification for on-site detection of unsintered brick masonry". The work done in this paper is as follows: 1) the development course of autoclaved pulverized coal brick is discussed. Characteristics and application prospects, and summarizes the principle of determining the compressive strength of autoclaved pulverized coal brick in masonry by springback method and the main factors influencing the resilience value. The test is carried out through the standard sample of autoclaved pulverized coal brick made by Hunan University. The influence mechanism of different levels of vertical pressure, mortar, test method, moisture content and carbonation depth on the springback value is studied experimentally. After grouping, 42 groups of matching array of springback average and compressive strength are obtained. By using Origin software, the springback and compressive strength matching array are regressed according to the principle of least square method. The springback strength curve of autoclaved pulverized coal brick in Hunan province is established by power function. The verification experiment shows that the precision of rebound strength measurement curve of autoclaved fly ash brick in Hunan area is higher than that obtained in this paper. It can provide experimental support and data support for the compilation of Non-Sintering Brick masonry site Inspection Technical Specification.
【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】：TU522

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