Dosing pump for shotcrete liquid admixtures
2025-01-23 16:20:23
A dosing unit for shotcrete liquid admixtures is designed to precisely inject chemical additives into the concrete mixture during the shotcrete application process, whether using wet or dry spraying methods. These pumps are crucial for managing the characteristics of shotcrete, such as curing time, workability, and strength.
With this pump, the flow rate is automatically adjusted based on the conveying capacity of the rotor machine or concrete pump. Once the proportion of cement and the volume per rotation or stroke are entered, the control system takes over to convert and maintain the desired flow rate.
1. Accurate Admixture Dosing:
Dosing pumps ensure the precise and consistent addition of liquid admixtures, such as accelerators, retarders, and water reducers, which are vital for achieving the intended shotcrete performance across different conditions.
2. Enhancing Shotcrete Properties:
Accelerators: These are added to wet shotcrete to speed up the curing process, especially in cold conditions or when quick hardening is required.
Air-Entraining Agents: Improve the shotcrete’s resistance to freeze-thaw cycles, enhancing its durability.
Superplasticizers: These increase the mix's workability without additional water, improving finishability and strength.
3. Optimal Mixing and Bonding:
The dosing pump ensures that the admixtures are uniformly blended into the shotcrete mix, promoting uniformity and optimal bonding between the concrete and the surface it is applied to.
4. Increased Efficiency:
Self-Priming Capability: Many dosing pumps feature self-priming, allowing them to draw the liquid into the system automatically, without manual intervention.
Ease of Maintenance: These pumps are designed for easy servicing and are built for long-lasting performance, even in harsh shotcrete application environments.
Digital Control Systems: Dosing pumps often include digital displays that allow for precise monitoring and control of the admixture dosing rate, enabling adjustments based on project requirements.
Chemical admixtures dosing pump for concrete advantages:
Capable of running dry.
Simple maintenance.
Long-lasting service life.
Self-suction function.
Smooth and precise dosing control.
Digital display for visual monitoring.
Dosing system for liquid admixtures applications:
Wet Shotcreting: Admixtures like accelerators are added to the mix to speed up curing, particularly useful for underground applications or in cold weather.
Tunnel Linings and Mining: Dosing pumps are commonly used in tunnel shotcreting to provide quick-setting concrete, preventing collapse and improving structural strength.
Construction Projects: In various civil engineering projects, dosing pumps ensure that the shotcrete mixture is properly enhanced with the right admixtures, ensuring durable and high-quality results.
|
Model
|
GDUH15A-A dosing unit for shotcrete liquid admixtures
|
|
Pumping output
|
100-600 L/h
|
|
Air motor power
|
4 KW
|
|
Hose ID
|
16 mm
|
|
Air pressure
|
7 bar
|
|
Air consumption
|
3 m³/min
|
|
Air/Water connection
|
Quick coupler 3/4”
|
|
Conveying water pressure
|
Min. 4 bar
Max. 8.5 bar
|
|
Dimension
|
820×497×500 mm
|
|
Weight
|
160 Kg
|
Working Principle of the GDUH15A-A dosing unit for shotcrete liquid admixtures:
The GDUH15A-A liquid dosing unit for shotcrete machine operates based on the hose pump principle, emphasizing precise dosing, easy maintenance, and high serviceability. Its key features include exact dosing without backstroke, self-priming capability(up to 9.5 m), and the ability to run dry without damaging the system.
How It Works:
1. Drive Mechanism:
The dosing pump is powered by an electric motor with a frequency inverter, enabling precise control over the flow rate. This setup allows the pump to accurately meter the liquid admixture, with the current flow rate displayed on a digital screen in liters per hour (l/hour). This digital control provides real-time monitoring and adjustment.
2. Admixture Dosing:
The pump can be used in both wet and dry spraying methods:
Wet Method: Doses only the liquid admixture into the mix.
Dry Method: Doses both the liquid admixture and water into the mix.
This versatility allows it to cater to different shotcrete application processes.
3. Pressure Switch & Safety Features:
The dosing pump is equipped with a pressure switch that shuts down the pump when the pressure exceeds the maximum limit, such as when the spray nozzle is closed. This prevents overloading or damage to the system.
When pressure decreases, the pump automatically restarts, ensuring continuous operation without manual intervention.
4. Check Valves and Safety Valves:
The pump system incorporates check valves, relief valves, and reduction valves. These components are designed to:
Prevent the admixture from leaking into the water circuit.
Ensure the safe and efficient operation of the pump by maintaining controlled flow and pressure.
The GDUH15A-A dosing unit for shotcrete liquid admixtures offers reliable, precise dosing of liquid admixtures in shotcreting processes, providing flexibility for both wet and dry spraying methods. Its self-priming feature, safety mechanisms, and ease of maintenance make it an efficient choice for consistent admixture dosing, ensuring high performance and long service life.
Email：info@gaodetec.com .jpg)
.jpg)
