Yes, you can use PVA (polyvinyl alcohol) fibers in concrete countertops. PVA fibers are a type of synthetic fiber that can be added to concrete mixtures to improve the overall performance and durability of the concrete. Here are some benefits of using PVA fibers in concrete countertops:

1. Crack Prevention: PVA fibers can help reduce the formation of cracks in the concrete, which is especially important for thin and delicate structures like countertops.

2. Improved Toughness: PVA fibers can enhance the toughness and impact resistance of the concrete, making the countertop more durable and less prone to chipping or breaking.

3. Reduced Shrinkage: PVA fibers can help mitigate the drying shrinkage that can occur as the concrete cures, leading to a more stable and less prone-to-cracking countertop.

4. Enhanced Flexural Strength: PVA fibers can improve the flexural strength of the concrete, which is important for withstanding loads and stresses without failing.

When using PVA fibers for concrete countertops, it's essential to follow the manufacturer's guidelines for the appropriate dosage and mixing procedures. Properly mixing the fibers into the concrete mix is crucial to ensure they are evenly distributed, and the countertop achieves the desired benefits.

Additionally, it's essential to consider other factors in concrete countertop construction, such as proper reinforcement (typically with steel mesh or rebar), proper curing techniques, and the use of a suitable sealer to protect the finished countertop.