summarize
The quality of asphalt plays a vital role in the process of highway pavement construction. However, at present, the domestic asphalt market is mixed, and it is difficult to distinguish between true and false. Identification and detection of asphalt, the traditional simple site laboratory testing method is not only time-consuming and labor-intensive, and is vulnerable to the influence of additives such as modifiers and stabilizers, conventional asphalt three indicators can meet the requirements of the code, but the actual use of durability, anti-aging performance can not be identified. In response to the above problems, Shanghai Changji launched asphalt infrared spectrum detector. It can use infrared spectrum rapid identification detection technology to quickly identify the source of asphalt and the consistency of the sample.

Portable asphalt infrared spectrometer | Operation and maintenance guide

Quick identification and detection of asphalt infrared spectrometer

The basic principle of rapid identification and detection of asphalt is infrared spectroscopy. In organic molecules, the atoms that compose chemical bonds or functional groups are in a state of constant vibration. When infrared light is used to irradiate organic molecules, the chemical bonds or functional groups in the molecules can be vibrationally absorbed. Different chemical bonds or functional groups have different absorption frequencies and will be in different positions in the infrared spectrum, so that information about what chemical bonds or functional groups are contained in the molecules can be obtained. According to the scanning spectrum of asphalt, the consistency of asphalt can be judged by comparison and multivariate correlation analysis, and the asphalt index can be detected according to the correlation between the spectrum and asphalt properties.

The development of infrared spectrum analysis technology provides a powerful tool for the rapid detection of petrochemical products. Asphalt rapid identification and detection technology is different from traditional spectral analysis technology. It uses a stoichiometric multivariate correction method to establish a correction model by associating the near infrared (NIR) or mid-infrared (MIR) of the substance to be measured with the relevant composition or properties of the substance to be measured. During detection, only the spectrum of the sample to be measured is needed. The test results can be obtained by correcting the model calculation. Therefore, this technology has the advantages of fast analysis rate, high precision and simple operation, and has been widely used in the detection of the composition and physical and chemical properties of crude oil and oil products, as shown in Figure 1.

Instrument operating environment confirmation

(1) Check the hygrograph to see whether the environment meets the requirements: the ambient temperature is 16 ° C to 25 ° C (60F to 78F), and the relative humidity is 20% to 50%.

(2) Check whether the indicator light of the equipment is green, otherwise the dryer cylinder should be replaced.

(3) Confirm that there is no vibration, heat source, radiation, and non-corrosive gas around the instrument, especially when the instrument is collected, please stay away from the mobile phone.

Portable asphalt infrared spectrometer | Operation and maintenance guide

Instrument maintenance

The Power indicator light on the instrument is yellow in off-line state, red in abnormal and fault state, and green in normal operation state. When the indicator light changes from green to red, the desiccant should be replaced immediately, including the desiccant located in the sample pool. The replacement of the drying cylinder is determined according to the region and the use environment, and the drying agent is generally replaced once a week. If the instrument is not used for a long time, the desiccant must be replaced at least once every two weeks, and the host must be turned on at least once a week for not less than 2 hours each time.