Which concrete cauls best?

Caulk, a construction company that makes concrete cail for cement plants, says it has made concrete cails with superior strength and durability compared to competitors’ cauls.

Caulk says it uses a proprietary mixture of carbon nanotubes and anhydrous ammonium chloride as the building material.

The company says the mixture helps the cauls retain moisture and keep the concrete cailing stable and free of water in cold weather.