Redispersible polymer powder (RDP) is a water-soluble powder polymer emulsion. This material is widely used in the construction industry, primarily as a binder for cement and other building materials. The bond strength of RDP is a critical parameter for its application as it directly affects the properties of the final product. Therefore, it is essential to have an accurate and reliable test method to measure the bond strength of RDP.
Test Methods
Material
The materials required to perform this test are as follows:
1. RDP example
2. Sandblasted aluminum substrate
3. Resin impregnated paper (300um thickness)
4. Water-based adhesive
5. Tensile testing machine
6. Vernier caliper
test program
1. Preparation of RDP samples: RDP samples should be prepared with the appropriate amount of water as specified by the manufacturer. Samples should be prepared according to application requirements.
2. Substrate preparation: The aluminum substrate after sandblasting should be cleaned and dried before use. After cleaning, the surface roughness should be measured with a vernier caliper.
3. Application of RDP: RDP should be applied to the substrate according to the manufacturer’s instructions. The thickness of the film should be measured using a vernier caliper.
4. Curing: RDP should cure within the time specified by the manufacturer. Curing time may vary depending on the type of RDP used.
5. Application of resin impregnated paper: Resin impregnated paper should be cut into strips of appropriate size and shape. Paper should be evenly coated with a water-based adhesive.
6. Sticking of paper strips: The adhesive coated paper strips should be placed on the RDP coated substrate. Light pressure should be applied to ensure proper bonding.
7. Curing: The adhesive should cure within the time specified by the manufacturer.
8. Tensile test: Load the sample into the tensile testing machine. Tensile strength should be recorded.
9. Calculation: The bond strength of the RDP should be calculated as the force required to separate the RDP coated substrate from the paper tape divided by the surface area of the RDP coated substrate.
in conclusion
The test method is a simple and cost-effective method of measuring RDP bond strength. This method can be used in research and industrial settings to ensure optimal performance of RDP in cement and other construction materials. Using this method can help improve quality control and product development in the construction industry.
Post time: Sep-05-2023