How does effective quality control relate to the results obtained from C136?

Effective quality control in the context of C136, which refers to the test method for particle size distribution (gradation) of aggregates, is critical because it directly relates to obtaining reliable data about the size and distribution of aggregate particles. This data is essential for ensuring that the aggregates used in concrete meet the specified requirements crucial for the performance and durability of the concrete mix.

The particle size distribution affects various properties of concrete, including workability, strength, and durability. When quality control practices include regular testing of aggregates using methods like C136, it enables practitioners to assess whether the aggregates are within the designated grading specifications. This, in turn, supports quality assurance processes, ensuring that the concrete produced will perform as expected in its intended application.

Other aspects mentioned in the other choices are related to concrete quality but do not directly connect to the primary purpose of the C136 test. For instance, while compliance with building codes is important, it is more about overarching regulations rather than the specifics of aggregate quality. Similarly, cost efficiency of aggregate procurement and the aesthetic characteristics of concrete are influenced by many factors beyond just particle size distribution, making them secondary considerations in the context of C136.