Which factor can negatively impact the strength of concrete?

The strength of concrete is significantly influenced by the quality and grading of the aggregates used. When aggregates are poorly graded, it can lead to several issues such as voids between the particles and insufficient bonding between the aggregate and the cement paste. This poor interlock can result in increased porosity and reduced density in the concrete mix, ultimately diminishing the overall compressive strength. Well-graded aggregates, in contrast, pack more closely together, resulting in fewer voids and a stronger concrete matrix. Inadequate grading can lead to weaknesses that compromise the structural integrity of the concrete, emphasizing the critical role that aggregate quality plays in achieving the desired strength of the final product.