LSY-18A Concrete Sulfate Resistance Dry–Wet Cycling Test Chamber (Horizontal Type)
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Description
Product Introduction
The concrete sulfate dry–wet cycling test apparatus is manufactured in accordance with GB/T 50082, “Standard for Test Methods of Long-Term Performance and Durability of Concrete.” It was jointly developed by the Institute of Building Materials of the China Academy of Building Research and our company and is a patented product protected by national intellectual property rights.
To establish a standardized method for testing the sulfate resistance of concrete, this testing machine is suitable for conducting sulfate‑resistance tests on ordinary concrete with high strength grades under alternating dry–wet conditions.
Structural features:
1. The test vessel consists of a corrosion-resistant stainless steel inner liner and outer shell, both equipped with sealed lids, and is further insulated with thermal insulation material to prevent solution evaporation, thereby integrating the immersion container and the heating oven into a single unit.
2. It enables the specimen to remain stationary throughout the cycling process of immersion, air-drying, oven-drying, and cooling.
3. Microcomputer-controlled; the dry–wet cycling process is displayed in real time on an LCD screen, and the system features power‑off memory functionality.
4. This testing instrument reduces the physical workload of laboratory personnel and minimizes errors introduced by manual procedures, thereby yielding more scientifically sound and accurate test results.
This testing machine is designed to accommodate 18 sets of cubic concrete specimens, each measuring 100 mm × 100 mm × 100 mm, for a total of 54 specimens.
Alternatively, six groups of 18 concrete prism specimens, each measuring 100 mm × 100 mm × 400 mm, may be accommodated.
Technical Specifications:
| Parameter Category | Parameter content |
| Internal dimensions | Length 1200mm × Width 660mm × Height 680mm |
| External dimensions | 3500 × 900 × 1500mm |
| Drying temperature | 80℃ ± 5℃ |
| Solution temperature control range | 20~25℃ |
| Weight | Approximately 150 kg |
| Power supply | 220V |
| Power | 6KW |
Test procedure:
Concrete specimens are removed from the standard curing chamber, dried, and then placed in a dry–wet testing chamber (the reservoir must be filled at once with 160 kg of a 5% sodium sulfate solution). The specimens are evenly arranged on the rack, with a 30 mm gap maintained between each specimen.
2.1 Specimen Immersion: The solution level shall extend at least 5 mm above the specimen surface, and the specimen shall be immersed for 16 ± 0.5 hours.
2.2 Drying the Specimens: After soaking is complete, the drain valve automatically opens; within 30 minutes, drain the solution completely and allow the specimens to dry, starting from the drain…
The total time required for the liquid to dry on the specimen is 1 hour.
2.3 Drying of Specimens: After air-drying is complete, proceed with oven drying. Raise the specimen temperature to 80°C ± 5°C and maintain this temperature for 6 hours.
2.4 Specimen Cooling: After drying is complete, the refrigeration system is activated to bring the temperature inside the specimen chamber close to room temperature.
Note 1: In the container used for soaking the specimens, the ratio of the volume of the solution to the volume of the specimen shall be maintained at 3 ± 0.1.
Note 2: During the test, the pH of the solution should be checked regularly—typically once a week during the first month, and thereafter at intervals of…
Perform 15 cycles, maintaining the solution’s pH between 6 and 8 and its temperature within the range of 20–25°C.
After the specimen has cooled to room temperature, complete one dry–wet cycling test cycle, then immerse it in the solution and proceed according to steps 2.1–2.4 described above.
The method proceeds to the next wet–dry cycle.
2.5 At each set of ten wet–dry cycles, perform a weighing test on the specimen under test, concurrently conduct a compressive or flexural strength test, and inspect the surface for any signs of damage.
2.6 During the dry–wet cycling test, an equal number of specimens shall be prepared and subjected to standard curing as a reference for compressive strength testing or…
Control specimens for flexural strength. The test shall be terminated when the corrosion resistance coefficient of mass is below 95%, or when the corrosion resistance coefficient of compressive strength (cube specimens) falls below 85%, or when the corrosion resistance coefficient of flexural strength (prism specimens) drops below 70%, or upon reaching 50 dry–wet cycles.
Instructions:
3.1 Turn on the power switch on the panel.
3.2 Pressing any button on the front panel will bring up the main menu. Once the main menu appears, use the up and down keys on the panel to navigate.
Select the desired function; to enter the selected function, press the Confirm button on the panel. For example, when the ▲ cursor is positioned on the Boot System item, pressing the Confirm button will take you to the Boot System interface.
If, at the boot screen in Step 1, you press any key and the following screen appears, it indicates that the device was not shut down properly last time—possibly due to a sudden power outage or other circumstances. On the subsequent screen, use the up and down keys to make your selection.
3.3 When the system starts, the following interface appears. In the “Number of Cycles” field, “000/300” indicates the number of cycles already completed versus the total number of cycles to be completed.
The total number of completed iterations; the remaining time indicates how much longer it will take to finish the current iteration.
As shown in the figure, drainage will continue for another 30 minutes. During operation, you can press the Cancel button on the control panel to interrupt the process.
Verify; the selection interface from the previous step will appear.
3.4 In Step 2, when you enter the system settings view, the following screen will appear. Use the Up and Down arrow keys to page through the options and query other items.
Parameters. Press the Cancel key to return to the main menu.
3.5 In Step 2, after entering the system settings, the following screen will appear. Use the up and down arrow keys to select the parameter you wish to modify, then press…
Press the OK key to enter the settings for the selected parameter. As shown below, the temperature upper limit parameter on page 2 is currently selected.
Press the OK button to enter the temperature upper-limit setting screen, as shown below. The position of the cursor can be adjusted using the up and down keys to modify the value.
Addition and subtraction: Press the left mouse button to move the cursor from the units place to the tens place, then use the plus or minus keys to adjust the value in the tens place. After completing the settings, press the OK button to save the values and return to the corresponding screen in the previous step. If you do not wish to save the configured values, press the Cancel button to go back to the relevant screen in the preceding step.
Other parameter settings are similar to the temperature upper limit setting and can all be configured using this method.
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