Whether using a personal recipe or a bagged mix, contractors should be aware of a variety of factors that can produce a failed final product. By following these tips from industry leaders, contractors will achieve success when making precast mixes.
- Avoid water. Adding too much water to a mix will result in a stiff, unworkable mix. To avoid this, use a super plasticizer, an admixture that gives the mix extra workability.
- Achieve a well-graded mix. By having no gaps in the gradation, contractors will have a well-graded mix where the particles are packed close together reducing the need for paste and strengthening the end product.
- Cure it slow. When curing, concrete needs to be kept wet long enough for it to achieve its strength. By following good curing practices, contractors will have a successful end result.
- Use the proper amount of cement. If contractors hold back on the amount of cement to reduce costs, the mix design won't be strong enough and will result in cracking. Caution: adding more cement means adding more water! More water increases likelihood of cracking. Educate clients. Unlike several other available countertop options, concrete will stain. As a result, it is important for contractors to inform their clients of concretes ability to pick up spills.
- Educate clients. Unlike several other available countertop options, concrete will stain. As a result, it is important for contractors to inform their clients of concretes ability to pick up spills.
