![]() One critical problem with this method is that if a specimen’s air voids are high, and thus potentially interconnected (for dense-graded HMA this occurs at about 8 to 10 percent air voids), water quickly drains out of them as the specimen is removed from its water bath, which results in an erroneously low volume measurement and thus an erroneously high bulk specific gravity. This SSD condition allows for internal air voids to be counted as part of the specimen volume and is achieved by soaking the specimen in a water bath for 4 minutes then removing it and quickly blotting it dry with a damp towel. SSD is defined as the specimen condition when the internal air voids are filled with water and the surface (including air voids connected to the surface) is dry. The most common method, calculates the specimen volume by subtracting the mass of the specimen in water from the mass of a saturated surface dry (SSD) specimen. ![]() The difference in weights can then be used to calculate the weight of water displaced, which can be converted to a volume using the specific gravity of water. These methods, based on Archimedes Principle, calculate specimen volume by weighing the specimen (1) in a water bath and (2) out of the water bath. There are several different ways to measure bulk specific gravity, all of which use slightly different ways to determine specimen volume: This reliance on bulk specific gravity is because mix design is based on volume, which is indirectly determined using mass and specific gravity. The bulk specific gravity is a critical HMA characteristic because it is used to calculate most other HMA parameters including air voids, VMA, and TMD. The three primary mixture characterization tests discussed here are:īulk specific gravity is essentially the density of a compacted (laboratory or field) HMA specimen. We ship our products worldwide.Mixture characterization tests are used to describe fundamental mixture parameters such as density and asphalt binder content. We’re here to help, and we’ll make sure you’re comfortable with your upcoming equipment purchase!īe sure to check out our shipping and returns page if you’re curious about the shipping costs on your product. We’ll let you know their exact dimensions in case you’ve only got so much room for a device. We’ll field any questions you may have about our products, their stats, or how they work. And if you’re curious about any of our products, don’t hesitate to give the pros here at Certified Material Testing Products a call. Don’t forget to browse through the rest of our asphalt testing products all here on our online store. Remember, we carry all sorts of material testing products here at CMTP. Don’t forget to purchase our solvents as well. ![]() Reflux extraction is also possible with our extractor sets - also varying in capacity. Furthermore, we carry vacuum extractors, as well as vacuum extractor components including hoses and seals. We also carry filter rings for extractors that require filters, and we’ve got a selection of extractor bowls. We carry centrifuge extractors with various features and capacities. ![]() Browse through the litany of products we carry, and find the right tools to get the job done! ![]() Here, we feature our catalogue of extraction tools that you’ll need for your asphalt. Here at Certified Material Testing Products, we provide state-of-the-art equipment that’ll aid you in testing your asphalt products. Asphalt quality control is crucial for attaining the proper asphalt structure. ![]()
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