Investigation of Hydrated Lime Effect in Asphalt Pavements (original) (raw)
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Effect of Hydrated Lime on Asphalt Cement and Asphalt Mixtures Properties
2019
In 2014, it was noticed that, asphalt cement obtained from some Egyptian refineries did not meet the specification limits of asphalt cement 60/70 used in Egypt. Using this defective asphalt will produce low stability and high flow asphalt mixtures which leads to the formation of rutting and cracks in the pavement. This study has two objectives. The first objective is to investigate the effect of using hydrated lime on defective asphalt and also on its asphalt mixtures properties. While the second objective is to evaluate the performance of asphalt mix containing hydrated lime. To achieve these study objectives, an experimental program was designed. Selecting and performing qualification tests on aggregates and two specimens of asphalt. Asphalt specimens were defective asphalt and non-defective asphalt. Adding different percentages of hydrated lime to defective asphalt cement and performing some tests to determine the properties of modified asphalt. Then performing Marshall, loss of ...
Romanian Journal of Transport Infrastructure, 2015
Flexible or asphalt concrete pavement is the paving system most widely adopted all over the world. It has been recognized that there are many different types of the factors affecting the performance and durability of asphalt concrete pavement, including the service conditions, such as: the variation of temperature from mild to extremes and the repeated excessive axle loading as well as the inadequate quality of the raw materials. All of these when combined together are going to accelerate the occurrence of distresses in flexible pavement such as permanent deformation and fatigue cracking. As the result, there has an urgent need to enhance the ability of asphalt concrete mixture to resist distresses happened in pavement. Use of additives is one of the techniques adopted to improve pavement properties. It has been found that hydrated lime might be one of the effective additives because it is widely available and relatively cheap compared to other modifiers like polymers. This paper pr...
The Effect of Hydrated Lime Mixing Forms and Ratios on Performance in Asphalt Pavements
Teknik Dergi
In this study; the water damage problem and indirect tensile strengths (ITS) were investigated for different hydrated lime (HL) additive ratios and adding methods. In this regard, identical briquettes modified with hydrated lime have been produced. HL was used both in the bituminous binder (wet method) and as part of the filler aggregate. The hydrated lime was added in two different ways to form the defined equivalent ratios. By producing nine identical briquettes in each option, the values of water damage and ITS in both unconditioned and modified mixtures were compared, and the level of significance differences between the identical briquettes and mixtures was questioned. Increasing the HL content increases the standard deviation between identical samples in terms of ITS. The workability of the mixture is adversely affected by the increase in the hydrated lime ratio. When HL is mixed into the asphalt cement (AC), the standard deviations of ITS values among identical samples remain lower due to the increase in mixing rates. Increasing the ratio of adding HL to the asphalt cement reduces the ITS ratios compared to the option of adding filler to aggregate. If HL is added to the mixture in low HL content, the water damage ratios show, on average, higher water damage resistance (15% higher) than the HL being added to the AC. However, if the HL content is increased to medium and high levels, mixing HL to AC creates higher water damage resistance than adding it as filler.
THE EFFECTIVENESS OF HYDRATED LIME AS ASPHALT CONCRETE ADDITIVE
Foundation of Civil and Environmental Engineering. 11/2007, 2007
This paper evaluates the effectiveness of hydrated lime as an additive to asphalt concrete based on laboratory, as well as field tests carried out on the test section. The research included testing of the resistance to the action of water and frost and to perma-nent deformation, as well as establishing of pavement condition survey parameters, including transverse profile and skid resistance on the test section constructed with as-phalt mixtures containing hydrated lime or liquid antistripping additive. It was estab-lished that hydrated lime may be added to asphalt concrete mixtures as an alternative to chemical antistripping additives.
Increasing the Durability of Asphalt Mixtures by Hydrated Lime Addition: What Mechanisms?
2012
Hydrated lime has been known as an additive for asphalt mixtures from their very beginning. It experienced a strong interest during the 1970s in the USA, when moisture damage and frost became some of the most pressing pavement failure modes of the time. Given its extensive use in the past 40 years, hydrated lime has been seen to be more than a moisture damage additive: It reduces chemical ageing of the bitumen and stiffens the mastic more than normal mineral filler above room temperature. All these properties impact durability and hydrated lime is now seen has an additive to increase asphalt mixture durability. This article is a literature review on the fundamentals of hydrated lime effect. The reasons why it is so effective lie in the strong interactions between aggregate and bitumen, and a combination of 4 effects, two on the aggregate and two on the bitumen. Hydrated lime modifies the surface properties of aggregate, allowing for the development of a surface composition and rough...
The effect of hydrated lime addition in improving the moisture resistance of hot mix asphalt (HMA)
IOP conference series, 2020
It is desirable to have pavement surfaces that last until its designed life. Ravelling, rutting, and potholes are one the pavement failures that are commonly found and those failures are related to the intrusion of moisture onto the asphaltic mixture. This research aims to study the usage of hydrated lime as an additive to improve the moisture susceptibility of the asphaltic mixture. There were two different natural aggregates used in this research project and the prepared specimens were tested by Marshall, Cantabro Loss, and Indirect Tensile Strength tests. From the research results, it was found that hydrated lime was effective in not only improving the moisture susceptibility of the asphaltic mixture, but also increasing the stability and making the asphalt specimens denser. It was also found that it is critical to choose the suitable aggregate to be used in the asphaltic mixture as it can significantly affect the quality of the asphalt specimens.
Using Hydrated Lime in Hot Mix Asphalt Mixtures in Road Construction
Abstract: An increase in predicted pavement fatigue life for lower air void contents and higher asphalt content has been suggested by various investigations on asphalt concrete pavement mixtures. The strength and load carrying capacity of hot mix asphalt results from the aggregate framework created through particle-particle contact and interlock. Fines or mineral filler have a role since their presence directly influences the composition and performance of asphalt mixtures. The coarse aggregate framework is filled by the sand-sized material and finally by the mineral filler. At some point, the smallest particles lose contact becoming suspended in the binder not having the particle-particle contact that is created by the larger particles. In most road project asphalt mixtures, stone dust, cement and lime are used as fillers. The overall effect of mineral filler in hot mix asphalt specimens has been investigated through a series of laboratory tests. It seems that a behavior influenced by the adherence of fines to asphalt film has been developed. The optimum bitumen content requirement in case of stone filler is almost the same as for lime. The Marshall-flow increased with the use of lime filler, suggesting that the resistance of bituminous mixes to permanent deformation is improved.
Experimental Study of the Moisture Susceptibility and Fatigue Performance of Hydrated Lime Modified Asphalt Concrete and a Design Application Case Study, 2019
Hydrated lime has been recognized as an effective additive used to improve asphalt concrete properties in pavement applications. However, further work is still needed to quantify the effect of hydrated lime on asphaltic concrete performance under varied weather, temperature and environmental conditions and in the application of different pavement courses. A research project has been conducted using hydrated lime to modify the asphalt concretes used for the applications of wearing (surface), levelling (binder) and base courses. A previous publication has reported the experimental study on the resistance to Marshall stability and the volumetric properties, the resilient modulus and permanent deformation at three different weather temperatures. This paper reports the second phase experimental study for material durability, which investigated the effect of hydrated lime content on moisture susceptibility when exposed to a freeze-thaw cycle, and the fatigue life. The experimental results show an improvement in the durability of the modified asphalt concrete mixtures. Optimum hydrated lime contents for different course applications are suggested based on the series experimental studies. Finally, the advantage of using the optimum mixtures for a pavement application is demonstrated.