Ing sphericity, roundness, and angularity (10, 11).
Potential to measure and report various shape factors includ. This system was selected because it canĪnalyze large quantities of particles in a short time and has the Of aggregates passing on a mini-conveyor or on a rotatingĬircular lighting table. The WipShape system uses two cameras to capture images Particlesâ size, shape, angularity, and texture. The system has theĬapability of automatically producing the distribution of Using twoĬameras improves the accuracy of measuring the characteris. In the sample as they fall in front of a backlight. The Camsizer system uses two cameras to capture images atĭifferent resolutions it evaluates a large number of particles To analyze particles with a wide range of sizes (from passing The PSSDA method was selected because of its ability
With manual measurements of flat and elongated particles Videograder was selected because it is capable of analyzingĮvery particle in the sample and it showed good correlation Works PSSDA were selected for evaluation. These methods only the VDG-40 Videograder and Buffalo Wire Imaging System (VIS), and Buffalo Wire Works PSSDA. Puter Particle Analyzer, Micromeritics OptiSizer PSDA, Video The next group of tests uses one camera to image andĮvaluate particles. (16, 17) and it does not identify spherical or rounded particlesĪnd measure one particle at a time (4, 7). Was described as tedious, labor extensive, and time consuming ASTM D 4791 was selectedīecause it is included in the Superpave system although it Provides more detailed measurements in terms of the distri-īution of the dimensional ratio. Low prediction and precision, with medium practicality (5).īoth the ASTM D 4791 test method for measuring flat andĮlongated coarse aggregates and the multiple ratio shape analy. Also, it was classified in another study as having Rao and Tutumluer (4)ĭescribed this method as being time consuming, labor intensive,Īnd subjective. Method (ASTM D 5821) was selected because it is currently The percentage of fractured particles in coarse aggregate
Shear tests it was selected for evaluation. More advantages than the Florida bearing ratio and direct Chowdhury and Button (3) concluded that theĬAR test method offers much more sensitivity than either Of these methods, theĬAR test is a relatively new test and has not received enoughĮvaluation. In the second group of tests, a compacted specimen isĮxposed to pressure or shear forces. Mance, predictability, precision, and accuracy (2). Time index was not selected because it is a timeĬonsuming test (1) and was classified as having fair perfor. Janoo and Korhonen (1) concluded that the FAA test was theĮasiest to use when it compared to time index, rugosity, and Selected for further evaluation because they are widely used andĬheaper and easier to use than other tests in the same group. Test) and uncompacted void content of coarse aggregates were Uncompacted void content ofįine aggregates (also known as Fine Aggregate Angularity
Ods in the first group rely on packing of aggregates that flow The test methods were divided into 11 groups based onĪnalysis concept, as shown in Table 3. The advantages and disadvantages of the test Information gathered from the literature (summarized inĪppendix D) was used to compare 21 available test methodsĪnd identify test methods for further experimental evaluation Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.