Recycled concrete aggregate as road base Leaching

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Recycled concrete aggregate as road base: Leaching ...

2018-2-1  The US Federal Highway Administration (FHWA) defines recycled concrete aggregate (RCA) as reclaimed portland cement concrete (PCC) produced by crushing concrete pavement, bridges, sidewalks, curbing, and other concrete structures (FHWA, 2007).

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Recycled concrete aggregate as road base: Leaching ...

2020-1-27  Recycled concrete aggregate as road base: Leaching constituents and neutralization by soil Interactions and dilution. Gupta N(1), Kluge M(1), Chadik PA(1), Townsend TG(2). Author information: (1)Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA.

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Recycled Concrete Aggregate as Road Base: Leaching ...

2021-8-7  RECYCLED CONCRETE AGGREGATE AS ROAD BASE: LEACHING CONSTITUENTS AND NEUTRALIZATION BY SOIL INTERACTIONS CARBONATION AND DILUTION By NAUTASHA GUPTA A THESIS PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIR EMENTS FOR THE DEGREE OF MASTER OF

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Recycled concrete aggregate as road base: Leaching ...

Recycled aggregate had shown to be an effective alternative to natural aggregate to meet the increasing demand for road construction materials as road base or subbase since it provides sufficient ...

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Recycled concrete aggregate as road base: Leaching ...

2017-11-22  Recycled concrete aggregate as road base: Leaching constituents and neutralization by soil Interactions and dilution. Nautasha Gupta Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA.

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Long-term leaching from recycled concrete aggregates ...

2017-6-1  In the present study, the metal leaching from recycled concrete aggregates (RCA) used in road sub-base is presented after > 10 years of exposure.The released levels of inorganic constituents, the effect of small variation of pH and the use of de-icing salt during winter season were studied.

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UNIVERSITY OF WISCONSIN SYSTEM SOLID WASTE

2020-10-6  The use of recycled concrete aggregate (RCA) as a road base has lowered costs of road construction while preserving virgin aggregate resources. Laboratory column leach tests have shown that leachate produced by RCA is persistently highly alkaline, potentially threatening groundwater quality. However, field-monitoring studies of RCA road base have not produced similar alkaline leachates. Both field and laboratory methods were employed to further study, compare, and predict leaching characteristics of RCA as a road base. This study produced first flush field data to determine the initial leaching

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Field site leaching from recycled concrete aggregates ...

2012-6-15  The release of major and trace elements from recycled concrete aggregates used in an asphalt covered road sub-base has been monitored for more than 4 years. A similar test field without an asphalt cover, directly exposed to air and rain, and an asphalt covered reference field with natural aggregates in the sub-base were also included in the study.

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Recycled concrete aggregate in base course applications ...

2020-3-5  Recycled concrete aggregate as road base: leaching constituents and neutralization by soil Interactions and dilution Waste Manag. , 72 ( 2017 ) , pp. 354 - 361 , 10.1016/j.wasman.2017.11.018 CrossRef Google Scholar

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Leaching issues in recycled aggregate concrete - ScienceDirect

2019-1-1  12.1. Environmental risks of recycled aggregate concrete. Recycled aggregate concrete is defined as concrete manufactured with waste materials in order to reduce the negative environmental impact that results from the manufacturing process of cement, achieving a more sustainable product.

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(PDF) Recycled concrete aggregate as a road base material

Sample A was a road base layer constructed from natural crushed aggregate (NCA), and sample B was constructed from recycled concrete aggregate (RCA). The dimensions of the samples are 1 m x 1 m ...

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Field site leaching from recycled concrete aggregates ...

2012-6-15  The release of major and trace elements from recycled concrete aggregates used in an asphalt covered road sub-base has been monitored for more than 4 years. A similar test field without an asphalt cover, directly exposed to air and rain, and an asphalt covered reference field with natural aggregates in the sub-base were also included in the study.

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Field site leaching from recycled concrete aggregates ...

2012-6-15  The leaching from recycled concrete aggregates applied in the sub-base of a road has been monitored systematically for more than 4 years. The pH of the infiltration water from the test fields with crushed concrete covered with asphalt was found to decrease significantly slower than for the test field with crushed concrete without an asphalt cover.

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pH-Dependent Leaching of Trace Elements from Recycled ...

Two types of recycled aggregate, crushed concrete and foamed glass, in addition to crushed natural stone were applied in the road base in three segments of the road, respectively.

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pH-Dependent Leaching of Trace Elements from Recycled ...

2012-6-20  Recycled concrete aggregate (RCA) has excellent mechanical properties and is often used as base course in pavement construction. ... The associated high-pH leaching patterns can be of concern, especially when compared to the neutral pH environment observed in actual road sections using RCA as base course. In this study, the pH-dependent ...

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A Review of Recycled Aggregates (RAP and RCA) as

2017-10-21  This paper presents a review of unbound recycled materials, specifically recycled asphalt pavement (RAP) and recycled concrete aggregate (RCA), as road base course for sustainable highway construction. A total of fifteen recycled materials were collected for

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(PDF) Use of recycled aggregate - The best road base material

Recycling aggregate is, when produced and used properly, one of the best road base materials present. The infopage is a summary of processing conditions, regulations, materials specs and ...

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(PDF) Leaching of Alkaline Substances and Heavy Metals ...

Leaching of Alkaline Substances and Heavy Metals from Recycled Concrete Aggregate Used as Unbound Base Course December 2013 Transportation Research Record Journal of the Transportation Research ...

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Recycled materials as substitutes for virgin aggregates in ...

Th is study evaluated the suitability of 17 mixtures of four recycled materials with aggregates as a replacement of 100% virgin aggregates in base and subbase layers of roads. Recycled materials tested were recycled asphalt pavement (RAP), recycled concrete material (RCM), fly

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Utilization of Upgraded Recycled Concrete Aggregates and ...

Waste concrete is the most predominant constituent material among construction and demolition waste. Current waste concrete recycling is limited to the use of recycled concrete aggregates as a road-base material and less as aggregates in new concrete mixes. Further, the production of recycled concrete aggregates results in the generation of a high amount of fines, consisting mainly of cement ...

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Recycled concrete aggregate as a road base material ...

2019-5-29  Therefore, aggregate such as recycled concrete aggregate (RCA) has become an alternative material for some particular civil construction. The implementation of RCA as road construction material has been raised for a long time ago especially in road base layer.

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(PDF) Recycled concrete aggregate as a road base material

Sample A was a road base layer constructed from natural crushed aggregate (NCA), and sample B was constructed from recycled concrete aggregate (RCA). The dimensions of the samples are 1 m x 1 m ...

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PAPER OPEN ACCESS Recycled concrete aggregate as a

NCA. Therefore, aggregate such as recycled concrete aggregate (RCA) has become an alternative material for some particular civil construction. The implementation of RCA as road construction material has been raised for a long time ago especially in road base layer. Road base

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pH-Dependent Leaching of Trace Elements from Recycled ...

Two types of recycled aggregate, crushed concrete and foamed glass, in addition to crushed natural stone were applied in the road base in three segments of the road, respectively.

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Chemistry of recycled concrete aggregate leachate in ...

2020-1-28  Chemistry of recycled concrete aggregate leachate in pavement base course applications . By . Morgan D. Sanger . A thesis submitted in partial fulfillment of the requirements for the degree of . Master of Science . Geological Engineering . At the . University of Wisconsin-Madison . Spring 2019

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Environmental Suitability of Recycled Concrete

2015-1-6  sizes on the leaching behavior of metals leached from RCA materials. MATERIALS Two conventional graded aggregate base (GAB) materials and two recycled concrete aggregate materials were used in the current study. GAB materials contain coarse and fine aggregate particles as well as fines (clay and silt).

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A Review of Recycled Aggregates (RAP and RCA) as

2017-10-21  This paper presents a review of unbound recycled materials, specifically recycled asphalt pavement (RAP) and recycled concrete aggregate (RCA), as road base course for sustainable highway construction. A total of fifteen recycled materials were collected for

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Recycled concrete aggregate in base course applications ...

2019-11-2  Recycled concrete aggregate in base course applications: Review of field and laboratory investigations of leachate pH. Sanger M(1), Natarajan BM(2), Wang B(3), Edil T(3), Ginder-Vogel M(4). Author information: (1)Department of Civil and Environmental Engineering, Geological Engineering Program, University of Wisconsin - Madison, United States.

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Use of Recycled Concrete Materials in Base/Subbase ...

2017-12-2  –Blend with virgin aggregate if designed base requirements exceed volume of recoverable RCA base. •Minimize waste and hauling by using RCA base across full pavement section (including shoulders) when excess material is produced (e.g., 12-inch PCCP is recycled to produce material for 4-inch base layer). 30

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Utilization of Upgraded Recycled Concrete Aggregates and ...

Waste concrete is the most predominant constituent material among construction and demolition waste. Current waste concrete recycling is limited to the use of recycled concrete aggregates as a road-base material and less as aggregates in new concrete mixes. Further, the production of recycled concrete aggregates results in the generation of a high amount of fines, consisting mainly of cement ...

Get price
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