How to Perform the WV DOH Sand Patch Test for Macro Texture
Are you looking to improve the macro texture of your concrete surface? One way to do this is by performing the West Virginia Department of Highways (WV DOH) sand patch test. This simple test can help you determine the surface texture of your concrete and make necessary adjustments to achieve a smoother, more even finish. Here’s how to perform the WV DOH sand patch test:
What You’ll Need
- Concrete surface to test
- Masking tape
- 50-grit sandpaper
- Clean, dry sand (conforming to ASTM C778)
- Sand patch template (conforming to ASTM E965)
- Small trowel or putty knife
- Digital scale
Instructions
- First, clean the area of the concrete surface where you’ll perform the test, removing any dirt or debris that might affect the results.
- Use masking tape to outline a square or rectangular area of the surface where you’ll apply the sand patch mixture.
- Using the sandpaper, rough up the surface of the concrete within the taped area. This will create a better bond for the sand patch mixture.
- Measure and weigh the clean, dry sand, ensuring that it conforms to ASTM C778.
- Add water to the sand to create a thick, wet mixture. You want the mixture to be just wet enough to spread, but not so wet that it will flow out of the taped area.
- Spread the sand patch mixture over the taped area of the concrete surface, filling it to the height of the tape.
- Use the sand patch template to create a smooth, flat surface on the patch mixture. The template should be placed on top of the mixture and tapped gently with a small trowel or putty knife to achieve a smooth surface.
- After 30 minutes, remove the template and weigh it using the digital scale. Record the weight.
- Use the small trowel or putty knife to remove the sand patch mixture from the concrete surface.
- Repeat this process in different areas of the concrete surface to get a good sample of the overall macro texture.
- Finally, use the weights of the sand patches to calculate the average macro texture depth for the surface.
Conclusion
The WV DOH sand patch test is a simple, effective way to measure the macro texture of your concrete surface. By performing this test, you can make adjustments to improve the surface texture and achieve a smoother, more even finish. Give it a try on your next concrete project!
