To ensure the quality of the mix design, many tests are used to evaluate the properties of mix designs such as voids (air content), asphalt cement content, gradation, voids in mineral aggregate (VMA), stiffness, and others. There are three major methods for determining asphalt content: solvent extraction, chemical analysis, and physical testing.
The compressive strength of most pavement PCC ranges between 20.68 and 34.47 MPa (3000 and 5000 psi) (ACPA, 2001). High-strength PCC (typically defined as PCC with a compressive strength of at least 41.37 MPa (6000 psi)) has been designed for compressive strengths of more than 137.90 MPa (20,000 psi) in building applications.
Flow values for asphalt concrete with mineral filler range from 2.3 mm to 3.3 mm, while those for asphalt concrete with hydrated lime range from 2.4 mm to 3.4 mm. The best bitumen content for both mixtures was discovered to be 6.5%.
Engineers can predict how well an asphalt mixture will perform and the maximum load it can support using the Marshall Stability Test.
The Marshall Test is a popular and well-established method for determining the load and flow rate of asphalt specimens. It begins with compaction into moulds using manual or automated Marshall Compactors and is then conditioned in a Water Bath at the specified temperature.
The liquid binder that holds asphalt together is known as bitumen. A bitumen-sealed surface is one that has been sprayed with bitumen and then covered with aggregate. This is then done again to create a two-coat seal. Asphalt is made in a plant that heats, dries, and combines aggregate, bitumen, and sand.
Shovel away the top material with a round-point shovel and remove the material from at least three places in the hopper, directly above the slat conveyors. To obtain a representative sample, ensure that a portion of each of the three sampled areas is placed in each of the buckets.