Brand: STD
STD 305 D is a designation for a type of concrete mix used primarily in the construction industry. STD stands for Standard, indicating that this mix meets certain requirements and specifications.305 is the maximum strength of the concrete in pounds per square inch (PSI) at 28 days of curing, which is 3,050 PSI. D refers to the type of mix, which is a dense or compact mix.This dense mix is commonly used in residential and commercial construction, such as in the building of foundations, walls, bridges, and pavements. The higher strength and lower permeability of STD 305 D make it a durable and long-lasting option for structures exposed to heavy loads, repeated traffic, or harsh environments.