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Browsing by Author "Ranaivoson, Andry"

Now showing 1 - 6 of 6
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    Hydraulic and Mechanical Properties of Recycled Materials
    (Minnesota Department of Transportation, 2009-10) Gupta, Satish; Kang, Dong Hee; Ranaivoson, Andry
    Construction and maintenance of roads requires large volume of aggregates for use as base and subbase materials. Because of the cost of virgin aggregates, federal and state agencies are encouraging the recycling of waste materials including materials in old pavements. This study assessed the suitability of four recycled materials relative to virgin aggregates for use as base and subbase materials. The four recycled materials were the reclaimed asphalt pavement (RAP), fly ash (FA), reclaimed concrete material (RCM), and foundry sand (FS). Assessment of these materials was done in terms of their hydraulic, mechanical, and leaching properties when mixed in with various proportions of virgin aggregates. Except for slightly higher fine content in some RAP-aggregate mixtures, particle size distribution of all mixtures was within the Mn/DOT specification band for Class 5 materials. Water retention (pore size distribution), hydraulic conductivity, resilient modulus, and shear strength measurements were generally similar to that of 100% aggregates. Exception was the mixtures of FS. Heavy metal concentrations in the leachate were also generally less than the EPA drinking water standards. We concluded that FA, RAP, and RCM mixtures will be good substitutes of virgin aggregates as base and subbase materials.
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    Moisture Retention Characteristics of Base and Sub-base Materials
    (2004-12-01) Gupta, Satish; Singh, Amanjot; Ranaivoson, Andry
    Soil water retention refers to the relationship between the amount of soil water and the energy with which it is held. This relationship is important for characterizing water movement through granular materials. In this project, we generated soil moisture retention data of 18 non-recycled and 7 recycled materials used in pavement construction. The results showed that water retention of non-recycled materials was nearly similar. The major differences among the curves were in the inflection points (air entry values) and in the water contents either near saturation or at 15,300 cm of suction. Using this database, we also developed Pedo-transfer functions that can predict (1) water retention or (2) the parameters of functions that describe water retention from easily measurable properties of the pavement materials. Water retention of concrete with and without shingles was only slightly different. This is partially because shingle chips imbedded in the concrete were large. Traditionally, the influence of matric suction has not been directly considered in pavement design. The water retention data in this report will be helpful in developing resistance factors for Minnesota Flexible Pavement Design Program either through physical modeling or through statistical relationships between design criteria and the water contents.
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    Pavement Design Using Unsaturated Soil Technology
    (Minnesota Department of Transportation, Research Services Section, 2007-05) Gupta, Satish; Ranaivoson, Andry; Edil, Tuncer; Benson, Craig; Sawangsuriya, Auckpath
    Pavements are constructed on compacted soils that are typically unsaturated. The negative pore-water pressure (soil suction) due to the ingress of water in between soil particles has a significant effect on pavement foundation stiffness and strength. The study characterized the effects of soil suction on shear strength and resilient modulus of four soils representing different regions of Minnesota. The deviator stress in shear strength measurements followed a power function relationship with soil suction. Resilient modulus also followed the power function relationship with suction but these relationships fell within a narrow range. We present models for incorporating suction effects in shear strength and resilient modulus measurements of highly compacted subgrade soils. We also briefly outline a framework for incorporating these models in the resistance factors of MnPAVE. Since soil water content and the resulting soil suction under the pavement varies with season, adjustments are needed to account for increased strength and stiffness of the material as a result of unsaturated soil conditions. These adjustments will not only reflect the more realistic field conditions but will result in more reliable performance predictions than the current pavement design method.
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    Proceedings of the 4th Drainage Water Management Field Day
    (2011-08-23) Strock, Jeffrey S.; Gupta, Satish; Sands, Gary; Ranaivoson, Andry; Hay, Chris; Talbot, Mike; Magner, Joe
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    Proceedings of the 6th Soil and Water Management Field Day
    (2017-07-18) Strock, Jeffrey S.; Ahaiblame, Lauren; Gupta, Satish; Ranaivoson, Andry; Varga, Tamas; Dalzell, Brent; Hummel, Alexander; Zhang, Lu
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    Proceedings of the 7th Soil and Water Management Field Day
    (2020) Strock, Jeffrey S; Dalzell, Brent; Garcia y Garcia, Axel; Pease, Lindsay; Fernandez, Fabian; Niaghi, Ali Rashid; Ranaivoson, Andry