一、Product Introduction

RJ-UHPSC ultra-high performance shotcrete is a new material for shotcrete that can be used in shotcrete construction, developed by the Renjian Baogu Technology Center in cooperation with Central South University, Changsha University of Science and Technology, Hunan Vocational and Technical College of Transportation, Hunan Tengda Geotechnical Engineering Technology Co., Ltd. This material is mainly used for non excavation construction, repair, reinforcement, waterproofing, anti-corrosion, etc. in highways, high-speed railways, bridges, tunnels, airports, military ports, port terminals, dams, urban underground structures, sewage and drainage pipelines, etc. Especially in situations where the project schedule is tight, material requirements are high, the working face is complex, and construction conditions are difficult, the use of UHPSC ultra-high performance shotcrete construction can achieve good results, solving the technical problem that ultra-high performance concrete cannot be shotcrete construction for many years. The research and development achievements have reached the international advanced level.

The main technical parameters of the sprayed concrete are: 28 day compressive strength ≥ 150MPa, flexural strength ≥ 18MPa, bond strength ≥ 2MPa, and impermeability P14. After hardening, it has excellent properties such as waterproofing, anti-corrosion, wear resistance, drag reduction, high strength, durability, and environmental protection. It has multiple patented technologies such as complete material preparation, spraying equipment, and construction processes, and has completely independent intellectual property rights.

二、Characteristics and Technical Parameters of RJ-UHPSC Series

RJ-UHPSC ultra-high performance sprayed concrete has strong thixotropy, good spraying construction performance, and strong adhesion with the base layer;

The thickness of the dome spray can be ≥ 100mm, the rebound rate is ≤ 5%, and there is a certain amount of adjustable operation time after spraying;

High early strength, 24-hour compressive strength reaches 60MPa, 28d ≥ 150MPa, flexural strength ≥ 18MPa;

Good bonding strength, with a bonding strength of 28d ≥ 2MPa;

Strong adhesion with steel components and firm bonding with old concrete. Wide adaptability, non-toxic and harmless, environmentally friendly products;

Good durability, waterproof, anti-corrosion, anti-seepage, water increasing, and drag reducing. No rust on steel components, durable and sturdy;

Good impact resistance, can be used for protective structures in national defense engineering, and can also be used for special structures that require high load-bearing capacity.

item		Performance index
		100	120	150
Setting time （min）	Initial set	≥45	≥45	≥45
	Final set	≤600	≤600	≤600
Compressive strength （MPa）	24h	≥40	≥50	≥60
	3d	≥60	≥70	≥90
	28d	≥100	≥120	≥150
Flexural strength （MPa）	28d	≥12	≥15	≥18
Bond strength （MPa）	28d	≥2	≥2	≥2
impermeability	28d	P10	P12	P14

The production of the product is based on the DB43/T2951-2024 standard of the "Technical Specification for Application of Ultra High Performance Shocked Concrete"

三、Application scope

Used to reduce the size of structural components, increase the usable area and space. Building bridges with longer spans and greater clearances;

The outer protective layer used for steel structures of offshore oil platforms can significantly improve the service life of components in water level fluctuation zones;

Used in the military and security fields to manufacture anti explosion and anti impact devices;

Structural maintenance and reinforcement of buildings, bridges, tunnels, and docks;

Processing and manufacturing of various building external cladding panels, decorations, bridge or public building external cladding special-shaped panels.

四、Usage

Surface treatment: Clean the foundation surface and ensure that there are no debris such as crushed stones, floating slurry, dust, oil stains, and release agents. Spray interface agent on the surface of the base layer before construction;

Construction method: According to the actual construction situation, sprayed concrete (UHPSC) has good thixotropic properties and can be manually applied or sprayed for construction, or can be sprayed with intelligent robotic arms for construction;

Slurry preparation: Add clean water in a clean container according to a material to water ratio of 100:8-12, slowly add sprayed concrete (UHPSC) premix, and mix with a forced mixer until evenly mixed. Be careful not to dilute too much, as it may affect the construction performance. Do not prepare too much material at once, and use it up within 45 minutes;

Construction: Connect the spray conveying hose of the spray gun, adjust the pressure of the spray machine and air compressor, start the spray machine, adjust the air pressure, and spray the slurry from the spray gun mouth in a mist form. After the spray slurry is formed, uneven areas can be manually smoothed and smoothed;

Maintenance: After initial setting, cover with a film or spray with water to maintain moisture, but do not spray too much water to prevent surface dust. Special curing agents can also be sprayed or covered with film for curing;

五、Typical applications

Under normal storage conditions, the storage period is 90 days. If it exceeds 90 days, it must be verified through testing before use.