What does "Gmm" stand for in asphalt testing?

The term "Gmm" refers to "Maximum specific gravity of the aggregate mixture." This measurement is crucial in asphalt testing as it represents the ratio of the mass of a given volume of the aggregate mixture to the mass of an equal volume of water at a specified temperature. It plays a significant role in determining the voids in the mix, which directly affects the durability, strength, and performance of an asphalt pavement.

Understanding Gmm helps engineers assess the quality of the asphalt mixture and ensure that it meets specifications required for various applications. This measurement is essential for various calculations, including determining optimal asphalt binder content, evaluating air voids in the mixture, and ensuring uniformity and consistency in the production of asphalt.

The other options do not accurately define Gmm. For example, "Gravel maximum mass" and "General material mass" do not relate to the specific gravity of asphalt mixtures, while "Gross maximum moisture" is unrelated to specific gravity concepts in asphalt testing.