混凝土空心砖材料冻融机测试系统

发布时间：2018-01-12 20:17

本文关键词：混凝土空心砖材料冻融机测试系统　出处：《天津科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：我国北方地处严寒地带,如果混凝土材料的抗冻性不能达标,过早的损坏不但需要昂贵的维修与重建费用,还可能会对人民的生命财产造成重大损失。作为检测混凝土抗冻性的重要实验设备,传统的混凝土材料冻融机在实时数据传输和智能控制方面仍有不足,并且对于长时间的测试,仍需要人工的介入,还会导致实验结果的准确性不高。本文运用Labwindows/CVI与单片机技术,设计了混凝土快速冻融试验设备,对温度和液位数据进行实时采集与控制。本文首先对国内外冻融试验和冻融设备现状进行分析,依照混凝土冻融试验规程和混凝土冻融设备相关国家标准,确立本课题的设计方案。整个控制系统分为上位机和下位机两大部分。下位机硬件上以DS180820和154N传感器分别对冻融环境的温度和水位数据进行检测和采集,并使用AD7705模数转换模块对154N采集的液位数据进行处理,选择ATmega64作为下位机的核心,对传感器采集到的冻融环境信息进行处理,并通过串口通信与上位机进行数据交换,并且通过光电隔离设计保证系统稳定。上位机采用Labwindows/CVI软件编写用户界面并对来自下位机的监测数据进行处理、保存和显示在系统界面。该系统的其他部分,主要设计了主体试验箱,选取符合试验的屏蔽泵,冷热水箱等设备。该系统以精确模拟混凝土空心砖的冻融环境为最终目标,在实验过程中能够保证试验温度和液位的稳定,并对温度、液位异常情况进行迅速处理并报警,在数天的实验过程中,通过智能化自动化控制,实时记录试验温度信息,节省人力物力。系统界面直观、简洁,方便实验人员进行操作和记录数据。通过现场试验,根据国家标准对已知抗冻标号混凝土空心砖材料进行冻融试验,并计算得出该混凝土抗冻标号,与现有数据进行比对,确立该混凝土冻融试验设备的稳定性与可靠性,能够应用于现有混凝土抗冻试验,改善检测混凝土建筑材料的耐久性和准确度,同时间接提高了建筑的使用寿命和安全性,有广阔的应用前景。
[Abstract]:The north of our country is located in the cold zone, if the frost resistance of concrete material can not meet the standard, premature damage not only needs expensive maintenance and reconstruction costs. As an important experimental equipment for testing the frost resistance of concrete, the traditional concrete material freeze-thaw machine is still insufficient in real-time data transmission and intelligent control. And for a long time of testing, still need manual intervention, but also lead to the accuracy of the results of the experiment is not high. This paper uses Labwindows/CVI and single-chip technology. The rapid freeze-thaw test equipment is designed to collect and control the temperature and liquid level data in real time. Firstly, the current situation of freeze-thaw test and freeze-thaw equipment at home and abroad is analyzed. According to the concrete freeze-thaw test code and concrete freeze-thaw equipment related national standards. The whole control system is divided into two parts: the upper computer and the lower computer. The temperature and water level data of freeze-thaw environment are entered by DS180820 and 154N sensors in the hardware of lower computer. Check and collect. Using AD7705 A / D conversion module to process the liquid level data collected by 154N, ATmega64 is selected as the core of the lower computer, and the freeze-thaw environment information collected by the sensor is processed. And through serial communication with the host computer for data exchange. And through the photoelectric isolation design to ensure the stability of the system. The upper computer uses Labwindows/CVI software to write the user interface and process the monitoring data from the lower computer. Save and display in the system interface. In other parts of the system, the main test box is designed, and the shielding pump that conforms to the test is selected. The final goal of the system is to accurately simulate the freeze-thaw environment of concrete hollow brick, which can ensure the stability of test temperature and liquid level during the experiment. In the course of several days' experiment, through intelligent automation control, real-time recording test temperature information, save manpower and material resources, the system interface is intuitive and concise. It is convenient for the experimenter to operate and record the data. According to the national standard, the freeze-thaw test of the concrete hollow brick material with known anti-freezing mark is carried out through the field test, and the concrete anti-freezing mark is calculated. Compared with the existing data, the stability and reliability of the concrete freeze-thaw test equipment can be established, which can be applied to the existing concrete anti-freezing test, and improve the durability and accuracy of testing concrete building materials. At the same time, indirectly improve the service life and safety of the building, has a broad application prospects.
【学位授予单位】：天津科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU522.14;TP274

【共引文献】