lowersilica

Lowersilica is a type of concrete aggregate that contains a reduced amount of silica compared to standard concrete aggregates. Silica, also known as silicon dioxide, is a naturally occurring compound that makes up a significant portion of sand and other types of aggregate materials used in concrete production.

In standard concrete aggregates, silica content can range from 70 to 80 percent, whereas lower silica aggregates have a silica content of 30 to 50 percent. The reduced silica content in lower silica aggregates makes the products less reactive with alkali substances present in cement, which can lead to the formation of alkali-silica reaction (ASR) in concrete.

ASR can cause the degradation of concrete over time, resulting in the formation of expansion products such as alkali-silicate gel, which can lead to cracks and efflorescence. By using lower silica aggregates, the risk of ASR is significantly reduced, making the materials suitable for use in high-performance and durable concrete applications.

Lower silica aggregates are generally made from naturally occurring materials, such as volcanic rock or other rock types with lower silica content. These materials are often extensively analyzed and processed to achieve the desired silica content and other properties. Lower silica aggregates are commonly used in construction projects where high durability and long-term performance are essential, such as in bridges, high-rise buildings, and other infrastructure applications.