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제안 방법
- 3, resilient modulus test was performed to determine optimum fiber contents. Also, it was performed on EAM and FEAM in both of dry and wet conditions, to investigate the enhancement of moisture damage resistance of fiber modification. Figure 9 shows the resilient modulus test results.
- For the expanded application of Marshall mix design to Fiberf modified Emulsion Asphalt Mixture (FEAM), modified Marshall mix design was developed in the study. The modification included additional processes to the original Marshall mix design, which includes: Aggregate-Emulsion coating test, Determination of Optimum Water/Fiber Content (OWC/OFC), and curing of compacted mixture.
- 8mm/minute) on the triplicate test samples. Indirect tensile test was performed on EAM and FEAM in both of dry and wet conditions to investigate the enhancement of moisture damage resistance from fiber modification. Also, indirect tensile test was performed on typical HMA mixtures as control mixtures.
- study. The modification included additional processes to the original Marshall mix design, which includes: Aggregate-Emulsion coating test, Determination of Optimum Water/Fiber Content (OWC/OFC), and curing of compacted mixture. Detailed discussion on modified Marshall mix design is described as follows.
- Modified Marshall mix design was applied to determine the Optimum Emulsion Contents (OEC) and Optimum Water Contents (OWC). The optimized mixtures were fabricated to perform various tests, e.g., Marshall stability and indirect tensile test at dry and saturated condition to evaluate the water susceptibility. Details are described in the foliowing sections.
- To resolve the situation, the study utilized a fiber modifier to increase load bearing capacity and decrease moisture susceptibility of EAM. The study modified Marshall mix design (3) to find the Optimum Emulsion Contents (OEC) and Optimum Water Contents (OWC). The Optimum Fiber Contents (OFC) was determined at which the resilient modulus of mixture is maximized.
- The study performed a series of mechanical tests, e.g., indirect tensile test, resilient moulus test, and Marshall stability test. Also, the experimental design investigated the effect of fiber modification on moisture damage, because the moisture susceptibility is one of the major considerations in designing asphalt mixture (9).
- Also, the experimental design investigated the effect of fiber modification on moisture damage, because the moisture susceptibility is one of the major considerations in designing asphalt mixture (9). To evaluate the moisture susceptibility of mixtures, the study developed mixture saturation equipment, which is simulating the field saturated mixture condition (Figure 6).
- Generally EAM has a less load bearing capacity and more moisture susceptible than conventional Hot Mix Asphalt (HMA) (2). To resolve the situation, the study utilized a fiber modifier to increase load bearing capacity and decrease moisture susceptibility of EAM. The study modified Marshall mix design (3) to find the Optimum Emulsion Contents (OEC) and Optimum Water Contents (OWC).
대상 데이터
- (6). The study utilized polypropylene 3010, which is produced by H Company in Kentucky, U.S. Table 3 shows the test results of polypropylene 3010.
- The study utilized single source of aggregate with Nominal Maximum Aggregate Size (NMAS) of 12.5mm, Medium Setting (MS) type cationic emulsion, and polypropylene 3010 fiber. Modified Marshall mix design was applied to determine the Optimum Emulsion Contents (OEC) and Optimum Water Contents (OWC).
이론/모형
- Then, the Air Void (Av), Void in Mineral Aggregate (VMA), and Void Filled with Asphalt (VFA) were computed. Marshall stability and flow were determined on the compacted samples in accordance with the test method AASHTO T245-94 (ASTM D1559-76). It should be noted that Asphalt Institute (Al) procedure recommends performing Marshall stability test on the cold mixture at the temperature of 25oC, and also recommended that the minimum criteria of Marshall stability is 250 kg (7).
- Marshall stability test was performed on the EAM, FEAM, and HMA to evaluate the applicability of emulsified asphalt mixtures for the base course in terms of Marshall stability criteria. Figure 11 shows the test results.
- The study utilized Aggregate-Emulsion Coating (AEC) test to determine the optimum water contents, at which the coating rate is maximized. Figure 2 illustrates the aggregate-emulsion coating test results.
- Rapid Setting (RS), Medium Setting (MS), and Slow Setting (SS). The study utilized cationic medium setting emulsion, MS-2, in accordance with ASTM D3628. Typically, MS-2 is used for the aggregate mixtures.
- 05 increments. The test was performed in accordance with standard test method, ASTM D4123-82 (8). The schematic of test equipment and test setup are summarized in Figure 4 and Table 5, respectively.
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