非接触式混凝土收缩变形测定仪

一、概述：采用高精度等级的电涡流位移传感器，性能稳定，测量精确、主机采用高性能嵌入式数据采集系统和高效可靠的NJIOS2.1操作系统，确保无人值守条件下仪器可靠稳定的运行，配置嵌入式打印机即时打印，便于用户保存数据，大存储量数据文件保存。

First, the non-contact concrete shrinkage deformation tester overview: the use of high-precision grade eddy current displacement sensor, stable performance, accurate measurement, the host uses a high-performance embedded data acquisition system and efficient and reliable NJIOS2.1 operating system to ensure no one The instrument operates reliably and stably under the condition of duty, and the embedded printer is configured to print in real time, which is convenient for users to save data and save large data files.

二、技术参数：

★工作电压：AC 220V

★测量量程：2.0mm

★测量精度：优于2μm,16位高精度AD采集

★温度精度：±0.3℃

★湿度精度：±2%

★工作温度：0℃ — +40℃

★工作湿度：不结露

★系统环境：ARM920T 内核，32位令指系统，主频600MHZ。

★64M内存，256Mbyte闪存

Second, non-contact concrete shrinkage deformation tester technical parameters:

★Working voltage: AC 220V

★Measurement range: 2.0mm

★ Measurement accuracy: better than 2μm, 16-bit high precision AD acquisition

★ Temperature accuracy: ±0.3 °C

★ Humidity accuracy: ± 2%

★Working temperature: 0°C — +40°C

★Working humidity: no condensation

★ System environment: ARM920T core, 32-bit command system, clocked at 600MHZ.

★ 64M memory, 256Mbyte flash memory

三、传感器工作原理：

Third, the non-contact concrete shrinkage deformation tester sensor working principle:

四、测试原理；

电涡流非接触式测试方法，基本原理是采用非接触式位移传感器，固定在100mm×100mm×515mm的试模上（试模里浇筑有新拌混凝土），用非接触的方式测量混凝土试件的长度变化，避免测量仪器与测头直接接触造成的不利影响。采用反射靶与混凝土试件协同变形，表征混凝土试件的收缩。

Fourth, the test principle of non-contact concrete shrinkage deformation tester;

The eddy current non-contact test method, the basic principle is to use a non-contact displacement sensor, fixed on a test die of 100mm × 100mm × 515mm (with fresh concrete poured in the test die), and the concrete test piece is measured by non-contact method. The length changes to avoid the adverse effects caused by direct contact between the measuring instrument and the probe. The reflective target and the concrete specimen are co-deformed to characterize the shrinkage of the concrete specimen.

五、特点：

★真彩色触摸显示屏操作，界面友好方便，操作简单快捷

试件收缩、温湿度变化曲线直接显示，数据变化一目了然

★断电自动恢复，数据稳定可靠

★大存储量数据文件保存

★位移传感器探头调节装置放置简便可靠：位移传感器探头调节装置通过四枚紧固螺栓安装在混凝土试模上，操作简便、固定可靠

★专用的一体化温湿度传感器同步实时监测实验场所的环境温、湿度

★仪器还提供一个专用接口供用户可选配可埋入混凝土试件的一次性使用低成本数字化温度传感器实现对被测混凝土试件内部温度的同步实时监测。

Five, non-contact concrete shrinkage deformation tester features:

★ True color touch screen operation, friendly interface, easy and fast operation

The test piece shrinks, the temperature and humidity change curve is directly displayed, and the data changes are clear at a glance.

★Automatic recovery after power failure, stable and reliable data

★Save large amount of data files

★ Displacement sensor probe adjustment device is simple and reliable: the displacement sensor probe adjustment device is installed on the concrete test mold by four fastening bolts, which is easy to operate and reliable.

★Special integrated temperature and humidity sensor synchronously monitors the environmental temperature and humidity of the experimental site in real time.

★The instrument also provides a special interface for users to select the one-time low-cost digital temperature sensor that can be embedded in the concrete test piece to realize the synchronous real-time monitoring of the internal temperature of the tested concrete test piece.

六、应用领域：

混凝土收缩开裂与混凝土早龄期（3d）收缩性能密切相关，但传统的收缩性能测试方法对此无法检测。而这一时期内的混凝土，特别是大流动性混凝土的收缩性能变化是最为频繁和复杂的，诸如塑性沉降收缩、自生收缩、化学收缩以及干燥收缩均在此时发生。

本仪器遵循《普通混凝土长期性能和耐久性能试验方法标准》（GB/T 50082-2009）制造，采用电涡流法，适用于测定自成型后任意时段的自由收缩变形，也可用于无约束状态下早龄期混凝土与外界隔绝湿交换的条件下自收缩变形的测定。

混凝土技术研究，混凝土生产、质量监督检测部门以及水电 、公路、铁路等工程部门对混凝土的收缩变形的测定需要。

Sixth, non-contact concrete shrinkage deformation tester application areas:

Concrete shrinkage cracking is closely related to the early age (3d) shrinkage performance of concrete, but the traditional shrinkage test method cannot detect this. The shrinkage properties of concrete during this period, especially for large flow concrete, are the most frequent and complex, such as plastic settlement shrinkage, autogenous shrinkage, chemical shrinkage, and dry shrinkage.

The instrument is manufactured according to the Standard Test Method for Long-Term Performance and Durability of Ordinary Concrete (GB/T 50082-2009). It adopts the eddy current method, which is suitable for measuring the free shrinkage deformation at any time after self-forming, and can also be used in the unconstrained state. Determination of self-shrinkage deformation of early-age concrete under external wet exchange conditions.

Concrete technology research, concrete production, quality supervision and inspection departments, as well as hydropower, highway, railway and other engineering departments need to measure the shrinkage deformation of concrete.

七、检测原理：

电涡流传感器接通电源时，其前置器会产生高频电流信号，该信号可在探头头部产生交变磁场，并在其附近位置的金属导体表面产生电涡流场，其变化符合麦克斯韦公式导出的特定非线性函数，而通过变化即可利用函数计算出规定时间内的混凝土收缩情况。

Seven, non-contact concrete shrinkage deformation tester detection principle:

When the eddy current sensor is powered on, its preamplifier generates a high-frequency current signal that generates an alternating magnetic field at the head of the probe and produces an eddy current field at the surface of the metal conductor near it, which is in accordance with the Maxwell formula. The specific nonlinear function is derived, and by the change, the function can be used to calculate the concrete shrinkage within a specified time.

八、系统配置:

1. 非接触法混凝土收缩变形测定仪主机

2.环境温湿度传感器 1个

3.数字温度传感器 4个

4.配套位移传感器探头 6支

5.位移传感器探头支架 6套

6.标靶、标靶支架等 6套

7.USB转RS232数据线 1根

8.主机电源线 1根

Eight, non-contact concrete shrinkage deformation tester system configuration:

1. Non-contact concrete shrinkage deformation tester host

2. Ambient temperature and humidity sensor 1

3. Digital temperature sensor 4

4. Matching displacement sensor probe 6

5. Displacement sensor probe bracket 6 sets

6. Target, target bracket, etc. 6 sets

7.USB to RS232 data cable 1

8. Host power cord 1