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Subject: search.filters.subject.Hydrated lime

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    Effect of aging on fatigue performance of hydrated lime modified bituminous mixes
    (Elsevier, 2016-06) Kakade, Vijay B.
    Hydrated lime has traditionally been used as filler primarily for its ability to improve the moisture resistance of bituminous mixes. However, studies carried out in the past showed that the addition of hydrated lime is also useful in improving the resistance of bituminous mixes to rutting, fatigue and aging. The effect of lime in increasing the stiffness of the mix can be beneficial to thicker bituminous pavements, which will be in stress control mode of fatigue. The reduction in the rate of aging due to lime can also benefit the performance of mixes due to reduction in brittleness and improvement in the healing characteristics. The present work explores the effect of hydrated lime modification of bituminous mixes on their fatigue performance. The effect of two different methods of lime addition, wet and dry, was investigated. The influence of short-term and long-term aging of the mixes on the fatigue characteristics of bituminous mixes was examined. Ten different combinations of mixes with two virgin binders, four lime modified binders and four mixes with lime added as filler were considered in the investigation. The results of laboratory tests conducted for determination of the moduli of elasticity of mixes and the fatigue performance models obtained for different mixes, under two different aging conditions, combined with the mechanistic analysis of typical bituminous pavement sections established the beneficial effect of lime in improving the fatigue lives of bituminous layers, especially for thicker pavements.
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    Evaluation of the sensitivity of different indices to the moisture resistance of bituminous mixes modified by hydrated lime and other modifiers
    (Taylor & Francis, 2016-09) Kakade, Vijay B.
    The beneficial effect of hydrated lime added as filler to bituminous mixes in improving the moisture damage resistance of mixes has been known for a long time. However, the effect of binder modification using hydrated lime is less explored. Similarly, very little information is available on the influence of hydrated lime on the moisture resistance of bituminous mixes under critical conditions of high temperature and slow rate of loading. Extensive experimental investigations were conducted in the present study to quantify the relative beneficial effect of addition of hydrated lime in dry and wet methods on the moisture resistance of bituminous mixes. In the dry method, 1.5% and 2% lime (by weight of dry aggregate) was added as filler whereas in the wet method, VG30 and VG40 bitumen were modified using 20% and 30% lime (by weight of virgin binder). The moisture damage resistance of these mixes was evaluated by conducting different tests such as indirect tensile strength, dynamic modulus and dynamic creep tests to assess the sensitivity of different mix parameters in estimating the moisture resistance and to measure the influence of moisture damage on the mechanical properties and rutting performance. The performance of the conventional and lime-modified mixes was also compared with that of polymer and crumb rubber-modified bituminous mixes since lime-modified mixes have been evaluated in this study as possible alternatives to PMB and CRMB mixes, which are popularly used for roads with high traffic volumes. Lime-modified mixes were found to have the best moisture resistance compared to unmodified mixes and PMB- and CRMB-modified mixes. Evaluation of moisture damage in terms of dynamic modulus and dynamic creep tests was found to be significantly more sensitive to moisture damage compared to tensile strength ratio. The beneficial effect of lime has been observed to be significantly more under more severe conditions of high temperature and slow rate of loading compared to lower temperature and high frequency conditions.
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    Rutting performance of hydrated lime modified bituminous mixes
    (Elsevier, 2018-10) Kakade, Vijay B.
    Hydrated lime has conventionally been used in bituminous mixes primarily for improving the moisture damage resistance of bituminous mixes. Most of the available literature is about studies conducted on mixes in which lime was added as filler. The present study explores the effect of different proportions of hydrated lime added by two different methods (wet and dry) on the rutting performance of bituminous mixes. The rutting characteristics of unmodified and lime modified binders were evaluated in terms of superpave binder rutting parameter (G∗/sinδ) and non-recoverable creep compliance (Jnr). Mix rutting performance was measured in terms of E∗, E∗/sinφ, flow number and accumulated strain measured in dynamic creep test. Rutting performance of mixes improved significantly by lime modification. Wet method of addition of lime has significantly higher beneficial effect than the dry method. Flow number determined at 60 °C demonstrated the beneficial effect of lime more distinctly compared with the dynamic creep test conducted at 40 °C. It was also observed in this study that the beneficial effect of lime addition in reducing rutting (which is a high temperature phenomenon) was realized more at higher mix temperatures.