Which property does fine aggregate improve in a mixture?

Fine aggregate plays a critical role in improving the cohesiveness of a mixture. When fine aggregate, such as sand, is combined with coarser aggregates and cement, it fills the voids between larger particles, leading to a denser and more uniform mixture. This dense packing helps to bind the larger aggregate particles together effectively, enhancing the stability and workability of the concrete mix.

By increasing cohesiveness, fine aggregates contribute to the overall integrity of the mixture, making it easier to work with during application and ensuring better adhesion between the materials. This improved cohesiveness is essential for reducing the chances of segregation and bleeding, which can compromise the quality and performance of the final product.

While other options present interesting properties, they do not primarily relate to the specific function of fine aggregate in enhancing mixture cohesiveness. Durability involves various factors including mix design and curing, color variations are typically influenced by pigments or specific materials rather than the fine aggregate itself, and weight reduction pertains more to using special lightweight aggregates rather than fine aggregates.