recycled concrete aggregate as road base leaching

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Recycled concrete aggregate as road base: Leaching ...

Feb 01, 2018  Long-term leaching from recycled concrete aggregates applied as sub-base material in road construction Sci. Total Environ. , 587 ( 2017 ) , pp. 94 - 101 Article Download PDF View Record in Scopus Google Scholar

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Recycled Concrete Aggregate as Road Base: Leaching ...

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 science university of florida 2017 page 2

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Recycled concrete aggregate as road base: Leaching ...

Jan 27, 2020  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 ...

Recycled Concrete Aggregate (RCA) is often used as a replacement for natural aggregate in road construction activities because of its excellent mechanical properties, and this trend should increase as more transportation departments include RCA in specifications and design manuals.

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Long-term leaching from recycled concrete aggregates ...

Jun 01, 2017  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

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.

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Field site leaching from recycled concrete aggregates ...

Jun 15, 2012  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 ...

Jun 15, 2012  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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Toxicity of Recycled Concrete Aggregates: Review on ...

The use of recycled aggregates has been evaluated in several applications, such as road sub-bases, being directly or indirectly in contact with soil and groundwater. Leachates resulting from the leaching of the aggregates can toxically affect and alter the characteristics of all the surrounding elements.

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Cement treatment of recycled concrete aggregates and ...

Jan 01, 2021  Together with the depletion of natural aggregate resources, the use of recycled concrete aggregate (RCA) produced from CDW as a renewable resource in construction such as in cement-based materials (i.e., concrete, concrete blocks, and road bases) has been promoted and applied widely in many countries (Van Niekerk, 2002; Xuan et al., 2010, Xuan ...

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RECYCLED CONCRETE AGGREGATE AS ROAD BASE:

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 requirements for the degree of master of science university of florida 2017

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Field site leaching from recycled concrete aggregates ...

Jun 15, 2012  1. Sci Total Environ. 2012 Jun 15;427-428:86-97. doi: 10.1016/j.scitotenv.2012.04.021. Epub 2012 May 2. Field site leaching from recycled concrete aggregates applied as sub-base material in road construction.

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Environmental Suitability of Recycled Concrete Aggregates ...

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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Recycled materials as substitutes for virgin aggregates in ...

Waste generation in household, industry, and highway reconstruction has spurred recycling nationwide. One of the venues for use of recycled materials is in road construction. 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.

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Why How to Use Recycled Crushed Concrete - Superior ...

Nov 07, 2019  What is Recycled Concrete Aggregate? Recycled Concrete Aggregate (RCA) — also called “crushed concrete” — is made up of asphalt debris from other construction projects that can be reused to create driveways, pathways, garden beds and more.. When any concrete structure, road, sidewalk or parking lot is destroyed, that concrete is often

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Theses Recycled Materials Resource Center

This study evaluates the use of recycled concrete aggregate (RCA) and recycled asphalt pavement (RAP) as an unbound road base. This investigation looked at the climatic behavior (i.e., temperature effects, wet/dry cycling) of RAP and RCA and the effects of brick content on the resilient modulus and plastic strain (as an index) of RCA.

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Leaching Characteristics of Recycled Asphalt Pavement: RAP ...

Application Of Recycled Waste Aggregate To Lean Concrete Subbase In Highway Pavement CITATION: Y. -H Cho and S. -H Yeo. Canadian Journal of Civil Engineering, 2004. Vol. 31, No. 6, Pg. p. 1101-1108. ABSTRACT: As aggregates recycled from various types of construction waste are continuously

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Use of Recycled Aggregates in Construction

Expanded clay lightweight aggregate. Structural grades concrete. Not available. Recycled Aggregates Recycled Concrete Aggregate (RCA) Crushed sound and clean waste concrete of at least 95% by weight of concrete with typical total contamination lower than 1% of the bulk mass. Class 1A RCA is a well graded RCA with no more than 0.5% brick content.

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Leaching of Alkaline Substances and Heavy Metals from ...

Jan 01, 2013  There is an increasing trend toward using recycled concrete aggregate (RCA) in construction. However, concerns have been expressed in laboratory studies about the highly alkaline leachate, high-pH leaching patterns, and release of heavy metals from RCA (e.g., chromium, lead, and arsenic).

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Investigating Potential Environmental Issues of ... - EIRAI

leaching regime. The concentrations of substances leaching from recycled construction materials with finer aggregates are larger than that with coarser aggregates [17-19]. Many standards of leaching tests such as AS-4439 [20], BS-EN-12457 [21] and ASTM-D4874-95 [22] indicated that 4mm is a threshold of particle size in leaching test.

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how to calculate crushed concrete

Leaching Characteristics of Recycled Aggregate used as Road The use of recycled concrete aggregate RCA as a road base has lowered costs of road used to calculate the acid base addition for each pH target Leachate . Recycled Block amp Concrete The H amp K Group

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Tools and Resources for Using Industrial By-Product ...

Funded by the U.S. EPA, the Recycled Materials Resource Center conducted work to evaluate whether IWEM can be used as a predictive tool to accurately determine whether leaching from materials will result in significant changes in groundwater concentrations when the materials are reused as a base or sub-base in a roadway.

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Long-term leaching and mechanical behaviour at recycled ...

Apr 08, 2019  Construction and demolition recycling is regarded as an essential subject in the EU, as the target established by its policies to 2020 ratio is far from being achieved. The use of materials recycled from such waste has been widely deemed a contribution to the sustainability of the construction sector. Gypsum is one the limiting components of recycled aggregates

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Leaching of Alkaline Substances and Heavy Metals from ...

Jan 01, 2013  There is an increasing trend toward using recycled concrete aggregate (RCA) in construction. However, concerns have been expressed in laboratory studies about the highly alkaline leachate, high-pH leaching patterns, and release of heavy metals from RCA (e.g., chromium, lead, and arsenic).

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(PDF) Characterization of Recycled Concrete Aggregate ...

Recycled concrete aggregate (RCA) is a high-quality substitute for virgin aggregate as base or subgrade material in pavement construction. However, heavy metal leaching and/or production of high ...

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Recycled Concrete Aggregate Crushed Concrete Aggregate ...

Recycled aggregate concrete is common as a base for roads, parking lots, and driveways, as well as backfill material and shoulder stone. Recycled concrete can also be used to create 2”-4” recycled stone. This product is typically used for

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Recycled materials as substitutes for virgin aggregates in ...

Waste generation in household, industry, and highway reconstruction has spurred recycling nationwide. One of the venues for use of recycled materials is in road construction. 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.

Get price

Long-term leaching and mechanical behaviour at recycled ...

Apr 08, 2019  Construction and demolition recycling is regarded as an essential subject in the EU, as the target established by its policies to 2020 ratio is far from being achieved. The use of materials recycled from such waste has been widely deemed a contribution to the sustainability of the construction sector. Gypsum is one the limiting components of recycled aggregates

Get price

A Review of Recycled Aggregates (RAP and ... - SpringerLink

Oct 21, 2017  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 characterization and testing from across the USA.

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Use of Crushed/Recycled Concrete as Drainable

the recycled concrete. And shall identify location from where concrete will be removed; recycled concrete shall be placed in max 4-in lifts and each lift shall be compacted by a min of 3 passes w/ 10-ton roller (304.3.5) New Jersey Used as Dense-graded aggregate conforms with gradation and plasticity requirements (901.08)

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Recycled Base Aggregates in Pavement Applications (AWI041018)

Recycled aggregates such as RAP, RCA, RPM, RSG and BDC are used in pavement construction to enhance performance, save construction costs, and improve sustainability. In addition, blending recycled aggregates with cementitious stabilizers like coal fly ash, lime dust or cement kiln dust can further enhance sustainability, economics and long-term ...

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The Effect of the Reinforcing Agent from Construction ...

C.J. Engelsen, H.A. van der Sloot, and G. Petkovic, Long-term leaching from recycled concrete aggregates applied as sub-base material in road construction, Science of the Total Environment, Vol. 587: 94-101, 2017.

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Leaching behaviour of rock material and slag used in road ...

Dec 13, 2016  Christian J. Engelsen, Grethe Wibetoe, Hans A. van der Sloot, Walter Lund, Gordana Petkovic, Field site leaching from recycled concrete aggregates applied as sub-base material in road construction, Science of The Total Environment, 10.1016/j.scitotenv.2012.04.021, 427-428, (86-97), (2012).

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Technical Factsheets Construction Demolition Waste ...

The most common use of recycled aggregates in the Netherlands is in road base. In the seventies this use grew to a large scale, when problems arose with the common materials such as sand-cement and slags which were used by that time. The experience since then showed that very reliable and strong base layers could be built by using recycled ...

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how to calculate crushed concrete

Leaching Characteristics of Recycled Aggregate used as Road The use of recycled concrete aggregate RCA as a road base has lowered costs of road used to calculate the acid base addition for each pH target Leachate . Recycled Block amp Concrete The H amp K Group

Get price

(PDF) A comparative Life Cycle Assessment ... - ResearchGate

A comparative Life Cycle Assessment (LCA) of Using Virgin Crushed Aggregate (VCA) and Recycled Waste Concrete Aggregate (RCA) in Road Construction November 2011 DOI: 10.13140/2.1.3835.5841

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Assessing the Chemical and Physical Characteristics of ...

The use of recycled concrete aggregates (RCA) in pavement construction applications is well established and successful, particularly its use as a granular and/or stabilized base course. However, leaching of harmful substances, such as heavy metals, has been identified. The leaching mechanisms are strongly dependent on pore water pH

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

Jun 20, 2012  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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