1.7 : 砖的耐久性、强度和外观

Freeze-thaw is the process where water absorbed within a brick expands upon freezing and contracts when it thaws, leading to the degradation of the brick. The brick's ability to resist this type of damage is called durability.

Brick durability is graded, with SW-grade bricks being the most durable due to their high strength and low water absorption, followed by MW-grade and then NW-grade bricks.

The compressive strength of building and face bricks generally ranges from 1500 to 3000 pounds per square inch.

The strength of brick masonry mainly depends on the strength of the mortar, reinforcement, and the bricks themselves.

The appearance of bricks is influenced by changes in their size, alterations in their shape, and the degree of visible damage on the brick's face or corners, with the amount of chippage also being a consideration for the appearance of the bricks.

The color of bricks mainly comes from the clay type, while their surface texture and appearance are shaped by the dies, molds, or attachments used during the manufacturing process.