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Round manhole covers
Basic Info

Model No.: RPC-002

Product Description 1. RPC introduction:
It is made of cement, ground quartz powder, silica fume and superplasticizer, supplemented by appropriate curing system. Because of increasing the fineness and reactivity of components, it is called reactive powder concrete (RPC).
2. Technical characteristics of RPC preparation
RPC is composed of ultra-fine reactive powder, cement, high-quality fine aggregate, high-strength fiber, etc. it is a high-tech composite material combined with super fine-grained densification material and fiber-reinforced technology through optimized gradation design and high-temperature heat sealing. It has the characteristics of ultra-high strength, high toughness, high durability and high volume stability.
3. Raw materials:
Special mineral additives: a variety of active minerals independently developed by youlinsheng, Germany, are prepared by active combination experiments and calculation of the best particle size distribution.
Aggregate: standard sand; fine quartz sand, particle size range of 0 ~ 1250 μ m, three particle sizes.
Steel fiber: fine round steel fiber.
High performance additives imported from Germany
4. Advantages of RPC products developed by our company:
Good strength and durability index:
RPC components have long service life and high durability. The durability of the structure can reach 70-100 years of service life. According to the results of 600 quick freeze-thaw tests, there is no loss of dynamic elastic modulus and mass, and the chloride permeability is less than 40 Coulomb.
Ultra high mechanical properties:
It has ultra-high compressive strength, flexural strength and fracture energy, and good durability. The bearing capacity is 3.5-4.0 times of that of the traditional concrete cover plate, and the test report issued by the state recognized testing unit is available.
It has light weight and good construction performance
Light weight, which is 1 / 3 of the weight of traditional concrete cover plate, can reduce the structural load and the labor cost of installation and removal. The weight of traditional concrete cover plate is 80 kg, and that of RPC cover plate is 26 kg.
RPC mixture not only has good fluidity, but also has good cohesiveness. It does not segregate during transportation, pouring and tamping. In the narrow formwork and the reinforcement gap, the passing performance is good, and there is no need to vibrate after pouring.
Environmental protection of inorganic materials
All the materials are inorganic materials, green and environmental protection, reducing the national building emissions to 2 / 3 of the traditional concrete cover plate. Compared with the same amount of cement production process, the CO2 emission is only about half, and the amount of non renewable natural resource aggregate in the production process is only 1 / 3 and 1 / 4 of HPC and 30MPa concrete.
The appearance is standard and neat, and the construction and installation are convenient
Under the same stress conditions, the thickness and mass of RPC members are about 1 / 3 of that of ordinary concrete members, so it is convenient to handle and install. Factory prefabricated parts are used for production, and the overall dimensions are regular and uniform. It can be moved and placed repeatedly without corner dropping, cracking and edge breaking.
Low operation and maintenance cost
The cost is slightly higher than 10% - 15% of the traditional concrete cover plate, and the loss rate during the operation and maintenance period is extremely low, which can effectively reduce the cost during the operation and maintenance period. After calculation, it can effectively reduce the maintenance cost of the traditional concrete cover plate by 25% - 35%.
The specification, shape and logo of various RPC cover plates can be customized.
In line with the requirements of national industrial development direction
The national "Eleventh Five Year Plan" has put forward quantitative standards for energy conservation and emission reduction. The popularization and application of RPC technology is highly in line with the national requirements for building a resource-saving society and an environment-friendly society. Generally, the volume of RPC component is only about 1 / 3 of that of ordinary concrete, which can directly reduce the consumption of a large number of steel and cement when meeting the engineering application. Steel and cement belong to high pollution and high energy consumption industries. It is of great practical significance to control their application in Engineering for protecting resources and reducing pollution.
5. RPC application fields:
Product field of prefabricated structure
Under the condition of the same bearing capacity, the section size can be effectively reduced, the weight of the structure can be reduced, and the reasonable section form can be renewed. It is suitable for precast cover plate of electromechanical pipe trench and U-shaped groove for overpass, overpass, Urban Light Rail Viaduct and highway tunnel.
Leaf segmentation line
Prestressed structure
The extremely high compressive strength, elastic modulus and cracking strength make full use of the strength of high-strength prestressed tendons in prestressed members, and the phenomenon of creep and shrinkage is extremely small, which makes the loss of prestress caused by the shrinkage and creep of materials in the prestressed members to the minimum.
Leaf segmentation line
Seismic structure
The lighter structure system reduces the inertia load and the elastic deformation, and is used in the joint, so the shear resistance is enhanced.
Leaf segmentation line
The field of concrete filled steel tube
No fiber steel pipe RPC, high compression, elastic modulus and impact toughness. The pillar of high-rise or super high-rise building can greatly reduce the cross-section size and increase the use area and beauty of the building.
Leaf segmentation line
Other fields
It has high wear resistance and can be used for pavement and bridge deck reconstruction.
High permeability, pressure pipeline and corrosive medium transmission pipeline.
High impact resistance and ultra-high permeability, storage container for low and medium radioactive nuclear waste.
Jiangxi Long Zheng Techinical Developing (Pty) Ltd.

  Germany YouLinSheng Industrial Co (.LTD) is a integrated enterprise based on Chinese mainland, Hong Kong, Macao and Taiwan, engaged in R & D, production, sales, technology, construction, international trade and coating project management of high-performance fire retardant coatings, anti-corrosion and anti rust coatings, building interior and exterior wall coatings, reactive powder concrete (RPC). With the development of the world economy, Germany's youlinsheng group decided to set up youlinsheng group in China after a preliminary visit to China, focusing on the development of the construction industry.
Jiangxi youlinsheng Construction Engineering Co., Ltd. is a professional comprehensive construction enterprise, with professional contracting qualifications of architectural decoration engineering, building curtain wall engineering, fire facilities engineering, waterproof, anti-corrosion and thermal insulation engineering, steel structure engineering, etc. It has more than 230 employees, including 10 constructors, 15 senior engineers, 66 intermediate and senior technicians and 16 project managers. Since its establishment, the company adheres to the tenet of quality first, strict management and customer first, and has completed the construction of road and bridge engineering, municipal engineering, housing construction engineering, etc. So far, the company has contracted professional subcontracting projects all over the country, the construction area has reached more than 8 million square meters, has won good economic benefits and social reputation.
Jiangxi Longzheng science and Technology Development Co., Ltd. is an integrated enterprise engaged in the R & D, production, design, sales, construction and technical services of high-performance fire retardant coatings, anti-corrosion and anti rust coatings, interior and exterior wall coatings, reactive powder concrete (RPC). Jiangxi Longzheng academician workstation has been established, and long-term cooperative relationship has been established with Chinese Academy of Architectural Sciences, State Key Laboratory of fire science of China University of science and technology, and Yunnan Institute of communications technology. Through the iso9001-2015 quality system certification and environmental system certification, R & D products have won 50 national invention patents, 15 utility model patents, and won science and Technology Progress Award for many times.

Company Info
  • Company Name: Jiangxi Long Zheng Techinical Developing (Pty) Ltd.
  • Representative: rongrong
  • Product/Service: RPC Cover , Anti-fire Coating Material , Manhole Cover , Coating Material , Reactive Powder Cover Plate , Exquisite Workmanship Cover Plate
  • Capital (Million US $): 10000000RMB
  • Year Established: 2008
  • Total Annual Sales Volume (Million US $): US$5 Million - US$10 Million
  • Export Percentage: 1% - 10%
  • Total Annual Purchase Volume (Million US $): US$5 Million - US$10 Million
  • No. of Production Lines: 6
  • No. of R&D Staff: 5 -10 People
  • No. of QC Staff: 5 -10 People
  • OEM Services Provided: yes
  • Factory Size (Sq.meters): Below 1,000 square meters
  • Factory Location: 江西省赣州市赣州经济技术开发区工业园金岭路
  • Contact Person: Ms. May
  • Tel: 86-797-16679076618
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