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The objectives of the research were: (1) to investigate possible modifications to the existing TS... more The objectives of the research were: (1) to investigate possible modifications to the existing TSR test protocol or develop an alternate test method, and a conditioning procedure that can quantify the adhesive and cohesive damage in asphalt mixtures due to moisture; (2) to quantify adhesive damage in asphalt mixture using the boil test along with color measuring device; (3) to investigate the use of M.i.S.T conditioning procedure to quantify the cohesive damage in asphalt mixtures; (4) to explore the viability of the Impact Resonance test in assessing moisture damage in asphalt mixtures; (5) to evaluate the effect of different antistrip additives on asphalt mixtures and determine optimum antistrip additive content using the boil test with colorimeter device for different asphalt mixtures. The objectives were achieved by performing IDT test to obtain TSR from AASHTO T283 (currently used by NCDOT) and M.i.S.T conditioning (proposed conditioning procedure). The Boil Test (ASTM D3625) was done along with colorimeter device to quantify adhesive damage. The test were performed on six different HMA mixtures prepared from three different aggregate source. The Impact Resonance test was performed to study the effect of various support conditions on resonant frequency and its ability to detect moisture damage. The Boil Test along with colorimeter device was done on fifty four different loose mixtures prepared from three different aggregate source and three different antistrip additives with varying additive content. The most compatible and optimum antistrip additive content for a particular asphalt mixture was determined.
Journal of Testing and Evaluation, 2021
Moisture damage in asphalt mixtures has been a major cause for premature failure of asphalt pavem... more Moisture damage in asphalt mixtures has been a major cause for premature failure of asphalt pavements for decades. Although a lot of research has been done and many test methods have been developed to evaluate moisture damage in asphalt mixtures, not much research has been done on the use of nondestructive testing techniques to evaluate moisture damage in asphalt mixtures. The impact resonance (IR) test is a nondestructive test that is used to determine material properties like dynamic elastic modulus. The IR test on asphalt mixtures is done on a thin-disk specimen (150-mm diameter and 25-mm thickness). In this study, the IR test was used to assess moisture damage in asphalt mixtures by determining the resonant frequency of asphalt mixture samples in the unconditioned and moisture conditioned state. The relative reduction (ER) in dynamic elastic modulus was calculated as the ratio of the resonant frequency of conditioned and unconditioned specimens from the IR test, which was used to evaluate moisture damage. Moisture sensitivity of the asphalt mixtures was also determined by the tensile strength ratio (TSR) test. Two different moisture conditioning procedures were used for both the IR test and TSR test—modified AASHTO T 283 (Standard Method of Test for Resistance of Compacted Asphalt Mixtures to Moisture-Induced Damage) and Moisture Induced Stress Tester (MIST) conditioning. Six different mixtures from three different aggregate sources were used in this study. A good correlation was observed between TSR values from the TSR test using both conditioning procedures and the ER values from the IR test using both conditioning procedures for the asphalt mixtures used in this study. This study shows that the IR test can be used to evaluate moisture damage in asphalt mixtures. This study also explored the effects of various parameters such as support condition, impact source, and impact location on the resonant frequency from the IR test.
International Journal of Pavement Engineering, 2020
The Tensile Strength Ratio (TSR) test is commonly used to quantify the moisture susceptibility of... more The Tensile Strength Ratio (TSR) test is commonly used to quantify the moisture susceptibility of asphalt mixtures. This test method is based on the indirect tensile strength, which is not a fundamental property and hence cannot be used in the asphalt mixture design process. Therefore, alternative test methods that use a fundamental property to quantify moisture sensitivity of asphalt mixtures are needed. This study investigates if the linear impact resonance shift and frequency spectrum bandwidth changes measured using Axisymmetric Flexural Vibration (AFV) technique can be used to quantify moisture damage. This test enables calculation of the dynamic elastic modulus of the disk, based on measured resonance frequency as well as quantification of vibration energy dissipation in the specimens based on the change in bandwidth of frequency spectrum. AFV test is used to quantify moisture damage susceptibility of asphalt mixture specimens with different moisture conditioning levels and different mixture designs. The results of the AFV test are compared with the TSR test. Also, the sensitivity of the AFV test to quantify the effect of thixotropic aging due to storage and temperature are discussed. The results show that the AFV technique can successfully quantify moisture damage and the effect of aging and temperature change.
The objectives of the research were: (1) to investigate possible modifications to the existing TS... more The objectives of the research were: (1) to investigate possible modifications to the existing TSR test protocol or develop an alternate test method, and a conditioning procedure that can quantify the adhesive and cohesive damage in asphalt mixtures due to moisture; (2) to quantify adhesive damage in asphalt mixture using the boil test along with color measuring device; (3) to investigate the use of M.i.S.T conditioning procedure to quantify the cohesive damage in asphalt mixtures; (4) to explore the viability of the Impact Resonance test in assessing moisture damage in asphalt mixtures; (5) to evaluate the effect of different antistrip additives on asphalt mixtures and determine optimum antistrip additive content using the boil test with colorimeter device for different asphalt mixtures. The objectives were achieved by performing IDT test to obtain TSR from AASHTO T283 (currently used by NCDOT) and M.i.S.T conditioning (proposed conditioning procedure). The Boil Test (ASTM D3625) was done along with colorimeter device to quantify adhesive damage. The test were performed on six different HMA mixtures prepared from three different aggregate source. The Impact Resonance test was performed to study the effect of various support conditions on resonant frequency and its ability to detect moisture damage. The Boil Test along with colorimeter device was done on fifty four different loose mixtures prepared from three different aggregate source and three different antistrip additives with varying additive content. The most compatible and optimum antistrip additive content for a particular asphalt mixture was determined.
Journal of Testing and Evaluation, 2021
Moisture damage in asphalt mixtures has been a major cause for premature failure of asphalt pavem... more Moisture damage in asphalt mixtures has been a major cause for premature failure of asphalt pavements for decades. Although a lot of research has been done and many test methods have been developed to evaluate moisture damage in asphalt mixtures, not much research has been done on the use of nondestructive testing techniques to evaluate moisture damage in asphalt mixtures. The impact resonance (IR) test is a nondestructive test that is used to determine material properties like dynamic elastic modulus. The IR test on asphalt mixtures is done on a thin-disk specimen (150-mm diameter and 25-mm thickness). In this study, the IR test was used to assess moisture damage in asphalt mixtures by determining the resonant frequency of asphalt mixture samples in the unconditioned and moisture conditioned state. The relative reduction (ER) in dynamic elastic modulus was calculated as the ratio of the resonant frequency of conditioned and unconditioned specimens from the IR test, which was used to evaluate moisture damage. Moisture sensitivity of the asphalt mixtures was also determined by the tensile strength ratio (TSR) test. Two different moisture conditioning procedures were used for both the IR test and TSR test—modified AASHTO T 283 (Standard Method of Test for Resistance of Compacted Asphalt Mixtures to Moisture-Induced Damage) and Moisture Induced Stress Tester (MIST) conditioning. Six different mixtures from three different aggregate sources were used in this study. A good correlation was observed between TSR values from the TSR test using both conditioning procedures and the ER values from the IR test using both conditioning procedures for the asphalt mixtures used in this study. This study shows that the IR test can be used to evaluate moisture damage in asphalt mixtures. This study also explored the effects of various parameters such as support condition, impact source, and impact location on the resonant frequency from the IR test.
International Journal of Pavement Engineering, 2020
The Tensile Strength Ratio (TSR) test is commonly used to quantify the moisture susceptibility of... more The Tensile Strength Ratio (TSR) test is commonly used to quantify the moisture susceptibility of asphalt mixtures. This test method is based on the indirect tensile strength, which is not a fundamental property and hence cannot be used in the asphalt mixture design process. Therefore, alternative test methods that use a fundamental property to quantify moisture sensitivity of asphalt mixtures are needed. This study investigates if the linear impact resonance shift and frequency spectrum bandwidth changes measured using Axisymmetric Flexural Vibration (AFV) technique can be used to quantify moisture damage. This test enables calculation of the dynamic elastic modulus of the disk, based on measured resonance frequency as well as quantification of vibration energy dissipation in the specimens based on the change in bandwidth of frequency spectrum. AFV test is used to quantify moisture damage susceptibility of asphalt mixture specimens with different moisture conditioning levels and different mixture designs. The results of the AFV test are compared with the TSR test. Also, the sensitivity of the AFV test to quantify the effect of thixotropic aging due to storage and temperature are discussed. The results show that the AFV technique can successfully quantify moisture damage and the effect of aging and temperature change.