- Product Describe
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The vertical expansion rate tester for expansive mortar in concrete is designed in accordance with the national standard GB 50119-2003, Code for Design and Application of Concrete Admixtures. This code applies to the application of fourteen types of admixtures in concrete works, namely ordinary water-reducing agents, high-efficiency water-reducing agents, air-entraining agents, air-entraining water-reducing agents, set-retarding agents, set-retarding water-reducing agents, set-retarding high-efficiency water-reducing agents, early-strength agents, early-strength water-reducing agents, antifreeze agents, expansive agents, pumping agents, waterproofing agents, and rapid-setting agents. This test method is applicable to the determination of the vertical expansion rate of expansive mortar used for grouting.
Technical Specifications
1. Testing instruments and tools shall comply with the following provisions:
2. Dial indicator: measuring range 0–10 mm;
3. Glass plate: 140 mm long × 80 mm wide × 5 mm thick;
3. Mold trial: Precision-crafted cubic test molds measuring 100 mm × 100 mm × 100 mm; the joints between mold sections shall be packed with grease to prevent water leakage.
4. Spatula: 60 mm wide, 160 mm long;
5. Tamping board: a steel hacksaw blade may be used as a substitute;
6. Steel shims: ordinary steel plates, 250 mm long × 250 mm wide × 15 mm thick;
Installation of the Vertical Expansion Rate Tester
1. Steel shims: The surface shall be flat and the shims shall be placed horizontally on the workbench, with a levelness tolerance of no more than 0.02.
2. Mold trial: Place on the steel base plate; do not shake.
3. Glass plate: Place it flat in the center of the test mold, leaving a 10 mm gap on each side between the glass plate and the inner edge of the mold.
4. Digital dial indicator: The dial indicator and its mounting bracket must be securely fastened, yet the indicator stem must be able to move freely up and down. When installing the dial indicator,
When pressing down on the dial indicator, it must not be tilted forward, backward, left, or right.
5. The dial indicator stand shall be securely mounted on the steel base plate, positioned as close as possible to the test mold to minimize the overhang of the crossbar.
Mortar Vertical Expansion Rate Tester
Test Methods and Procedures
1. The water content for grouting material shall be determined based on a flow value of 250 ± 10 mm.
2. After the grouting material is mixed with water to a uniform consistency, it shall be poured into the mold immediately. Pour from one side of the glass plate. When the grout has reached a height of approximately 50 mm, use a tamping rod to tamp six times on each side of the test mold and six times in the central area. When the grout reaches a height of 90 mm, repeat the tamping procedure as before to expel as much air as possible. The final layer of grouting material shall be poured in one go until grout begins to flow out from both sides. Efforts should be made to minimize the upward buoyant force exerted by the grouting material on the glass plate.
3. On the grouting material surfaces on both sides of the glass panel, gently smooth the edges into slopes using a small knife, ensuring that the higher edge of each slope is flush with the glass surface and the lower edge is flush with the inner top surface of the test mold. The time for smoothing the slopes shall not exceed 30 seconds. Both the molding temperature and the curing temperature shall be (20 ± 3)°C.
4. After completing the slope, vertically position the dial indicator probe on the glass plate and record the dial gauge reading within 30 seconds. This reading serves as the initial reading.
5. Within 30 seconds after taking the initial reading, cover the grouting material surfaces on both sides of the glass plate with two layers of damp cotton cloth.
6. Starting from the initial reading, water the specimens every 2 hours for a total of four consecutive watering cycles. Thereafter, water them every 4 hours. Maintain moisture curing until the specified age is reached, and measure the height readings of the 3-day and 7-day test specimens.
7. From the start of the initial reading, the measuring apparatus and the test specimen shall remain stationary and free from vibration.
The vertical expansion rate shall be calculated according to the following formula:
In the equation—vertical expansion rate; t ε
h0 —— Initial reading of the specimen height (mm);
ht —— height reading at specimen age t (mm);
h —— Reference height of the test specimen: 100 mm.
The test result shall be the arithmetic mean of a set of three test specimens, calculated to two decimal places.
Company Profile
Hebei Yinfeng Experimental Instrument Co., Ltd. is a high-tech enterprise dedicated to the research and development, production, and sales of experimental instruments. The company is headquartered in Hebei Province, relying on the strong industrial foundation and technological innovation resources in the Beijing Tianjin Hebei region. It is committed to providing high-precision and high reliability testing equipment and solutions for material testing, engineering quality control, scientific research experiments and other fields.
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Add: Chengnan Industrial Zone, Xian County, Cangzhou City, Hebei Province
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