7.8 : Aggregate Cement Ratio

The Aggregate Cement ratio refers to the weight of aggregate divided by the weight of cement in a concrete mix. Altering this ratio has profound effects on the concrete's properties. This ratio plays a pivotal role in determining the strength, workability, and durability of concrete. When the Aggregate Cement ratio is higher, the mix is leaner, meaning it has less cement paste to lubricate the aggregate, potentially making the concrete less workable. Such mixes, known as lean, enhance the strength by decreasing the concrete's total porosity.

Conversely, a lower aggregate cement ratio means a richer mix with more cement paste, leading to better workability and cohesiveness. The aggregate cement ratio influences the strength of concrete; a leaner mix can result in higher strength due to reduced porosity from fewer voids in the paste. However, the strength of concrete is not solely dependent on this ratio. The water-to-cement ratio is another critical factor that interacts with the aggregate cement ratio, affecting the consistency and properties of the concrete. Maintaining the appropriate balance of these ratios is essential for producing concrete that meets the specific needs of construction projects while ensuring long-term performance and sustainability. Understanding these dynamics is crucial for crafting concrete with desired qualities, from durability to ease of handling.