Mechanical and Environmental Suitability of Recycled Concrete Aggregate as a Highway Base Material

Bestgen, Janile O.; Hatipoğlu, Mustafa; Çetin, Bora; Aydilek, Ahmet H.

doi:10.1061/(asce)mt.1943-5533.0001564

Cited by 55 publications

(14 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…On the other hand, smaller particles [1] and an acidic leachant [5] originate eluate with higher concentrations of heavy metals. The same author, in another study [27], indicates that decreasing aggregates' size is a very important factor to control the leaching behaviour of metals. Engelsen [5] and Galvín [44] specify that heavy metals, namely chromium (Cr), come essentially from the mortar fraction of the recycled aggregates [44].…”

Section: Heavy Metals and Anionsmentioning

confidence: 93%

“…Some authors have analysed the relation between L/S and time [25] and between L/S ratio and saturation degrees [1]. According to some authors, the L/S ratio variation in percolation experiments is intended to simulate different degrees of saturation to which aggregates may be subjected in reality and to interpret how this parameter may affect substances leaching [1] [27].…”

Section: Standardizationmentioning

confidence: 99%

“…Butera [9] stated that carbonation mainly occurs after crushing and suggested that long-time exposure to atmospheric conditions in a building does not reflect in a significant increase of carbonation. On the other hand, the alkalinity of aggregates from fresh concrete elements is due to the presence of lime or Calcium oxide (CaO) and Calcium (Ca) [27].…”

Section: Phmentioning

confidence: 99%

“…The increase of pH value after decrease of the size of the aggregates is due to the fact that the non-carbonated area exposed to leachate increased. However, Bestgen [27] said that, for leaching tests application, a higher pH value is more dependent on the aggregates' chemical composition than on the variation of their size.…”

Section: Phmentioning

confidence: 99%

See 3 more Smart Citations

Toxicity of Recycled Concrete Aggregates: Review on Leaching Tests

Maia¹,

Brito²,

Martins³

et al. 2018

TOBCTJ

View full text Add to dashboard Cite

Background:The toxicity of building materials can be addressed in the areas of occupational and environ-mental toxicology. In the first case, the harmful effects to workers caused by exposure to a specific substance during building materials production are analysed. In the latter case, the toxic effects of that substance on living organisms is examined.Several studies analysed the environmental impact of concrete production, considering a significant number of concrete constituents and compositions, in order to find ways of minimizing it. However, some of the traditional constituents of concrete may be potentially hazardous, presenting different levels of toxicity, but only a few studies are focused on this area. Still, and in order to reduce the potential environmental impact, studies have already started on the incorporation of alternative raw materials, which may affect concrete toxicity.It is important to develop more concrete toxicity studies analysing different mixes and constituents, in order to identify several ways of minimizing the potential toxicity of this construction material.Objective:Different procedures and results of the leaching tests of Recycled Concrete Aggregates (RCA) from previous studies will be presented and discussed in this paper.Method:The ecotoxicological characterization of materials is based on the analysis of the eluates resulting from leaching tests. There are several researches that apply different experimental leaching procedures according to existing standards and others with some variations in the standard test conditions: particle size, duration of the test, among others.Results and conclusion:The main characteristics of RCA that affect the results of the leaching tests will be identified.

show abstract

Section: Heavy Metals and Anionsmentioning

confidence: 93%

Section: Standardizationmentioning

confidence: 99%

Section: Phmentioning

confidence: 99%

Section: Phmentioning

confidence: 99%

See 2 more Smart Citations

Toxicity of Recycled Concrete Aggregates: Review on Leaching Tests

Maia¹,

Brito²,

Martins³

et al. 2018

TOBCTJ

View full text Add to dashboard Cite

show abstract

“…Recycled coarse aggregates are mainly composed of independent natural coarse aggregate and aggregate with the old cement mortar. It is generally agreed that there is much difference in physical properties between recycled concrete aggregate and ordinary aggregate: high porosity, high water absorption, high void ratio, high abrasion loss, and low bulk density [4]. is is due to the fact that recycled concrete aggregate is angular grain, rough surface, and aggregate with mortar adhered.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Aggregate Size on Strength Properties of Recycled Aggregate Concrete

2018

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

e study on preparation technology of recycled concrete with economical and technical feasibility has gained more serious attention in each country due to its involvement and effect on the environment protection and the sustainable development of human society. In this study, we conducted a control variable test to investigate and assess the influence of the aggregate size on the strength characteristics of concrete with different diameters of recycled aggregates. Concrete with recycled aggregates of 5∼15 mm (A), 15∼20 mm (B), 20∼30 mm (C), and their combinations were subjected to a series of unconfined pressure tests after curing for 28 days. Based on the results obtained from the tests, an effort was made to study the relationship between the mechanical characteristics of recycled aggregate concrete and aggregate particle size. Also, a regression model of recycled concrete was proposed to predict the elasticity modulus and to adjust the design of mixture proportion. It is believed that these experiment results would contribute to adjust the remediation mixture for recycling plants by considering the influence of recycled aggregate size.

show abstract

Waste Minimization and Reuse Technologies

Çetin

2018

Handbook of Environmental Engineering

View full text Add to dashboard Cite

Mechanical and Environmental Suitability of Recycled Concrete Aggregate as a Highway Base Material

Cited by 55 publications

References 36 publications

Toxicity of Recycled Concrete Aggregates: Review on Leaching Tests

Toxicity of Recycled Concrete Aggregates: Review on Leaching Tests

Effect of the Aggregate Size on Strength Properties of Recycled Aggregate Concrete

Waste Minimization and Reuse Technologies

Contact Info

Product

Resources

About