ASTM D4215-21 PDF Download

The ASTM D4215-21 standard outlines the requirements for various types of asphalt paving mixtures used for different purposes, including base, binder, leveling, and surface courses. The standard covers both new and recycled asphalt mixtures that are produced and applied in a cold-mix, cold-laid method.

The specification specifies the criteria that various components of the asphalt mixture must meet, including coarse and fine aggregates, mineral filler, and bitumen. It also provides guidance on the equipment and processes involved in the mixing and laying of the asphalt, including options such as central plant, travel plant, and grand or drag.

The standard includes detailed instructions for various mixing operations, such as aggregate storage, preparation of bitumen, handling of mineral aggregates and bitumen aggregates for recycling, and the actual mixing process. It also emphasizes the importance of plant inspection to ensure the quality of the asphalt mixture.

To determine the properties of the asphalt mixtures, several test methods are recommended in the standard. These include sieve analysis of aggregates, sieve analysis of mineral filler, determination of bitumen content, specific gravity of coarse and fine aggregates, plasticity index, and percentage of coated particles. These tests help assess factors such as gradation, bitumen content, and the presence of any contaminants.