French standard rutting test system

77F型French standard rutting test systemIt is a new model of rutting test equipment for NextRoad, designed according to the technical principles of French standard NF P98-253-1.

Nowadays, this standard has become a part of the EU standard EN 12697 for asphalt mixture testing, included in Part 22 of the rutting test, which is the test method for "Large Size Devices". Mainly used for evaluating the anti rutting performance of asphalt mixtures at level 2.

77F is a modern rutting test equipment that can synchronously roll two rutting plate specimens under wind and heat conditions. During the entire test process, it automatically completes the automatic measurement of rutting depth without opening the door, ensuring the accuracy of test results and improving test efficiency.

Main Features

*Modern software

The 77F is equipped with a new generation of experimental software based on the Windows operating system, with a graphical interface that is simple, intuitive, and easy to operate quickly.

The software comes with a built-in European (French) standard testing program, allowing users to conduct tests in accordance with regulatory requirements. At the same time, considering the research requirements, the software also allows users to modify experimental parameters, such as test temperature, rolling stroke, rolling speed, wheel rut measurement time, measurement point position, etc.

*Fully automatic rutting depth measurement system

The calculation method for rutting depth according to French standards is different from that of other countries in China, the United States, and the European Union. It calculates the average value by measuring the rutting depth at 15 points on the center wheel rolling trajectory of the test piece. These 15 points are divided into 3 columns along the direction of wheel travel, with 5 points in each column, spaced 75mm longitudinally and 25mm laterally. The equipment is equipped with 3 displacement measurement sensors and the sensor running track. After the test reaches 1000, 3000, 10000, 30000 (or including 30, 100, 300, and 100000) loads, the test stops, and the sensors can automatically measure the change in depth at the predetermined 15 positions along the track. All measurement work is carried out without manual intervention, ensuring that the reference plane for depth measurement remains unchanged and the data is accurate, improving repeatability and reproducibility.

*Good temperature control ability

The rutting test is mainly used to evaluate the ability of asphalt mixtures to resist deformation under high temperature conditions, so accurate temperature control and large-scale temperature simulation capability are crucial. The wind and heat system equipped on the 77F can simulate temperature conditions ranging from+35 ℃ to+80 ℃, meeting the research needs of various climate zones. The instrument can independently control the temperature of two specimens and maintain a constant temperature during the test process based on PID temperature control technology.

The physical image data acquisition device with three displacement sensors and one internal temperature sensor of the specimen can be connected to four temperature sensors for temperature testing, and two plug-in temperature probes can be inserted into the drilled holes of the specimen to test the temperature inside the specimen, and display the temperature changes in the form of a time temperature curve; Two temperature sensors are used to measure the external air temperature of the specimen attachment. Based on the advantage of the fully automatic rut depth measurement function, the operator does not need to open the cabin door to test the rut depth like traditional equipment during the entire test process, avoiding temperature fluctuations and stabilizing within ± 0.2 ℃ of the set temperature throughout the entire test process.

*Test progress indicator

After decades of continuous improvement, Nextroad's standard rutting test system has become increasingly convenient for experimenters to operate. The electric control box on the side of the equipment is equipped with a large size touch screen display, and the test software is pre installed and debugged before delivery.

Users can conduct experiments directly after powering on the device on site. The status indicator light at the top can provide real-time updates to the user on the current testing stage and keep track of the testing progress at any time.

*Automatic positioning system for test specimens

The test specimens and molds for rutting tests are very heavy, and handling the molds is not an easy task. In order to make it easier for experimenters to install and remove specimens, 77F has designed an automatic mold positioning system.

Users can equip a height adjustable flatbed truck in the laboratory to transport test molds and specimens to the vicinity of the equipment, level with the test mold base, push the test mold into the base, and the equipment can control the base to automatically slide horizontally into the test position and lift to the initial height, greatly reducing the burden on staff. When testing the rut depth, the system can control the base to lower the height so that the rut depth testing system can move along the horizontal track to the measurement point, and then control the test mold to return to the initial position for the rut depth testing system to test the rut depth.

Technical Specifications