Small Beam Bending Tester: What is the working principle of rotary compaction?

In our daily lives, there’s a type of machine—used for mix design—that’s compact yet durable, incredibly easy to move around, and equipped with a built-in mold angle measurement device. You can use this rotation feature to quickly check the quality of your mixes. Its extra-large capacity allows it to hold more mixtures, making it particularly convenient. It can also store important data from up to 20 experiments at a time, and comes with a variety of output options for you to choose from. So, do you know the main working principle of the rotary compaction tester? Let’s get a reminder from the manufacturer of the beam bending testers!

First, let’s take a look at the equipment used to shape asphalt mixtures by compaction and kneading. The purpose of this process is to achieve optimal volumetric characteristics and enhance the green performance of the mixture. Only after experimental testing can the mixture composition of the filter element more accurately reflect real-world conditions, enabling better prediction of whether the pavement will have long-term durability. This machine controls the entire process by measuring rotation, thereby simulating the effect of road compaction and allowing us to evaluate the pavement’s performance.

To put it simply, this device—known as the beam bending tester—is used to evaluate the compaction performance of asphalt mixtures. It was developed specifically for their testing and design purposes. Since its introduction in 2019, this laboratory instrument has enabled us to simulate the volumetric and engineering characteristics of pavement surfaces. The testing procedure involves using the kneading and shearing method under a constant vertical pressure and according to specified criteria: the specimen is rotated at a uniform speed around its central axis while being gradually removed. The results obtained from this test have proven to be highly effective.

The small beam bending tester—let me remind you—that’s actually a rotary compactor, primarily used for in-situ simulations and pavement compaction. It treats this material as a test specimen to predict the long-term performance of the entire pavement structure, determining whether it can offer excellent resistance to traffic and durability. By improving pavement performance, we can reduce maintenance costs and ensure high-quality, low-pollution standards. Now that you’ve seen all this, you probably know what it’s used for, right?

Nanjing Dongyong Shenfu Technology Co., Ltd. is a high-tech joint-stock enterprise. After conducting extensive research and establishing production facilities, we have developed highly advanced laboratories and all the necessary infrastructure. We have also obtained metrological certification and been recognized by the Nanjing Quality Supervision Bureau as a cooperative partner. Following years of steady growth and development, we now possess strong production and R&D capabilities, and we are proud to have a team of highly skilled professionals with expertise spanning various fields of electromechanics.