Exciting Updates | The Technology Achievement Evaluation Meeting for the "Vertical Concrete Mixing Plant" Successfully Held

On June 15th, the Transportation Committee of the China Technology Market Association (hereinafter referred to as the "Transportation Committee") organized a scientific and technological achievement evaluation meeting for "Vertical Plant-Mixed Stabilized Soil Mixing Machine" through a video conference in Beijing.

Nine experts attended the evaluation meeting, including Liu Jiaying, former Inspector of the Science and Technology Department of the Ministry of Transport; Zhao Zhizhong, former Director of the Western Transportation Construction Project Management Office of the Ministry of Transport; Wang Songgen, former Deputy Director of the National Engineering Research Center for Highway Maintenance Technology; Niu Kaimin, Deputy General Manager of Zhonglu Gaokao Traffic Science and Technology Group Co., Ltd.; Liu Yuwei, former General Engineer of China Communications Construction Third Bureau Engineering Co., Ltd.; Wang Xin, General Engineer of China Communications Construction Fourth Highway Engineering Co., Ltd.; Chen Yanjun, General Engineer of Longjian Road and Bridge Co., Ltd.; Yang Yuanghai, Deputy General Engineer of China Communications Road and Bridge Construction Co., Ltd.; and Ye Yi, Professor-level Senior Engineer of China Communications Infrastructure Maintenance Group Co., Ltd.

Associate Secretary-General Wang Bing and Director of Standard Work Department Wang Yan of the China Association of Technology Market, Secretary-General Liu Tao and Associate Secretary-General Gong Bing of the Transportation Committee of the China Association of Technology Market, attended the meeting. The meeting was chaired by Associate Secretary-General Ma Xin of the Transportation Committee.

Our country commonly uses cement-stabilized materials for the subgrade and sub-subgrade of highway pavements. With the development of transportation and logistics, heavy-duty traffic has become the predominant form of highway transportation, thereby demanding higher performance standards for pavement structures.

Cement-stabilized soil, commonly used as the subgrade and sub-base material for road surfaces, directly impacts the uniformity and stability of mixing with its blending equipment. This, in turn, significantly affects the overall stability and durability of the road structure. Currently, most soil stabilizers used globally are horizontal shaft designs, which generally suffer from large footprint, low mixing efficiency, and uneven finished material mixing. This results in material properties failing to meet expected standards, leading to early-stage issues such as cracking, water damage, and collapses in the road structure.

In recent years, vertical mixers have garnered attention for their advantages, such as even mixing, ease of construction, and energy efficiency. Currently, the most commonly used vertical mixers on the market are intermittent mixers, which have shortcomings like low production capacity, small discharge ports that are不便 for cleaning pots, and high costs when used in conjunction with main buildings. They are predominantly used for concrete mixing, while there is limited research on vertical mixing equipment for stable soil.

The applicant for the project is a well-known domestic enterprise engaged in the research and production of stable soil mixers. In recent years, based on thorough research of both domestic and international markets, the company has conducted in-depth and systematic studies on vertical plant-mixed stable soil mixers. By optimizing the overall structure of the equipment, it has broken through a series of key technologies and developed core devices such as multi-head spiral feeders and improved water spray systems, effectively reducing issues like aggregate congestion and uneven water spray during mixing. This has significantly improved the uniformity of the finished product and production capacity. The product has been applied and verified in some domestic road construction projects, receiving recognition and positive feedback from users. It also provides a new solution for the design and construction of heavy-duty traffic road surface materials.

To expedite the application of this advanced technology and play an even more prominent role in constructing a strong transportation nation, we have submitted an application for the evaluation of the achieved results to the Committee of Transportation.

The experts in attendance listened to the application unit's report, reviewed the relevant materials, and deemed the submitted documents to be complete and in line with the evaluation requirements. Through extensive domestic and international research, theoretical analysis, indoor and outdoor testing, and engineering validation, a systematic study of the vertical batch mix soil stabilizer has been conducted, yielding the following innovative achievements:

The company has researched the impact of the mixing height, mixing radius, and blade system of vertical mixers on the mixing effect, optimizing and determining the relevant technical parameters.

2. Developed and designed a multi-channel spiral feed distributor, which ensures thorough mixing and even distribution of aggregates and powders, resulting in more uniform blending.

3. Our newly developed circular spray device features a 360° water spray function, enhancing the uniformity of finished materials and improving dust suppression capabilities.

The project has secured 2 utility model patents, and its achievements have been successfully applied in several projects such as the Linyi Expressway from Linyi. The economic, social, and environmental benefits are significant, and the prospects for promotion and application are promising. The expert group unanimously agreed that the research achievements have reached an internationally advanced level overall.