Recycled Materials as Substitutes for Virgin Aggregates in Road Construction: I. Hydraulic and Mechanical Characteristics

2011 ◽  
Vol 75 (4) ◽  
pp. 1265-1275 ◽  
Author(s):  
Dong-Hee Kang ◽  
Satish C. Gupta ◽  
Andry Z. Ranaivoson ◽  
John Siekmeier ◽  
Ruth Roberson
Keyword(s):  
Mechanical Characteristics ◽  
Road Construction ◽  
Recycled Materials

Influence of the Mechanical Activation of Fly Ash on Strength of Ground Concrete Based on Waste Production

2021 ◽  
Vol 25 (11) ◽  
pp. 36-41
Author(s):  
D.V. Bespolitov ◽  
N.A. Konovalova ◽  
O.N. Dabizha ◽  
P.P. Pankov ◽  
E.A. Rush
Keyword(s):  
Fly Ash ◽  
Specific Surface ◽  
Mechanical Activation ◽  
Equilibrium Condition ◽  
Mechanical Characteristics ◽  
Road Construction ◽  
Waste Production ◽  
Direct Use ◽  
Silicon Oxygen ◽  
Physical And Mechanical Characteristics

The possibility of utilization of inactive fly ash in road concrete compositions by bringing of ash into a non-equilibrium condition with increased reactivity by mechanical activation in a vibration eraser is investigated. It was revealed that the optimal content of binder and fly ash in samples of soil concrete was 8 and 10 wt. %, respectively. It is shown that, due to mechanical activation, the specific surface area of fly ash increases by 2 times, dehydration and carbonization occur and silicon is replaced by aluminum in silicon-oxygen tetrahedra. It has been established that an increase of the content of crystalline carbonate phases is the reason for an increase in the strength of ground concrete. It is determined that the introduction of mechanoactivated fly ash into the composition of soil concretes contributes to increasing their physical and mechanical characteristics to the maximum strength grade M100. This indicates the competitiveness of ground concrete and the possibility of direct use of inactive fly ash in road construction.

scholarly journals Petrographic and Mechanical Characteristics of Concrete Produced by Different Type of Recycled Materials

Geosciences ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 264 ◽  
Author(s):  
Petros Petrounias ◽  
Panagiota P. Giannakopoulou ◽  
Aikaterini Rogkala ◽  
Paraskevi Lampropoulou ◽  
Basilios Tsikouras ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Mechanical Characteristics ◽  
Strength Class ◽  
Concrete Strength ◽  
Glass Waste ◽  
Recycled Materials ◽  
Curing Conditions ◽  
Different Types ◽  
Green Glass ◽  
Water Saturated

This paper examined three different types of recycled materials, such as beer green glass, waste tile, and asphalt, which will be used in different mixtures in order to prepare concrete specimens and, more specifically, their effect on concrete strength and how the petrographic characteristics of various recycled materials influenced the durability of C25/30 strength class concrete. Particular emphasis was placed on the effect of artificial microroughness of glassy and smooth surfaces of recycled materials on their final concrete strength. The concrete strength values do not show great variance, but their limited differences have been qualitatively interpreted by a new promising petrographic methodology, including the study of the surface texture of the used aggregate materials. Concretes are produced with constant volume proportions, workability, mixing, and curing conditions while using different sizes of each aggregate type. The aggregates were mixed both in dry and water saturated states in concretes. Concretes that are made by a mixture of beer green glass with quartz primer, as well as of tile with quartz primer, presented the optimum possible results of the compressive strength.

scholarly journals A Case Study of Industrial Symbiosis to Reduce GHG Emissions: Performance Analysis and LCA of Asphalt Concretes Made With RAP Aggregates and Steel Slags

2020 ◽  
Vol 7 ◽  
Author(s):  
Alessandra Bonoli ◽  
Anna Degli Esposti ◽  
Chiara Magrini
Keyword(s):  
Life Cycle ◽  
Asphalt Pavement ◽  
Ghg Emissions ◽  
Road Construction ◽  
Industrial Symbiosis ◽  
Current Case ◽  
Recycled Materials ◽  
The Road ◽  
Emilia Romagna Region

The concept of sustainability in the road construction sector is a complex issue because of the various steps that contribute to the production and release of greenhouse gas (GHG) emissions. Addressing this issue, the European Commission has put various policy initiatives in place to encourage the construction industry to adopt circular economy (CE) and industrial symbiosis (IS) principles e.g., the use of recycled materials. Cooperativa Trasporti Imola (CTI), a company located in the Emilia-Romagna region (Italy), has been chosen for the current case study to examine practices, management, and the industrial symbiosis network among various companies in the road construction and rehabilitation sector. In this regard, the use of steel slags, obtained by an electric arc furnace (EAF), and reclaimed asphalt pavement (RAP), obtained by the deconstruction and milling of old asphalt pavement have been investigated. Two mixtures of recycled hot Mix Asphalt (HMA) i) were prepared incorporating different recycled material percentages for the wearing and binder course, respectively, ii) were characterized in terms of size distribution, strength modulus and volumetric properties, iii) and finally were compared to the performances of two mixtures entirely designed by virgin materials for the wearing and binder course, respectively. Therefore, the Life Cycle Assessment (LCA) tool was chosen to evaluate the environmental impacts that affect the designed road life cycle. The results show that recycling RAP and EAF slags in a CTI batch plant provides benefits by reducing the consumption of virgin bitumen and aggregates and by reducing CO2eq emissions. Finally, practical implications on the use of recycled materials in new asphalt mixtures from a life cycle and industrial symbiosis perspective are provided.

Microstructure, geotechnical and mechanical characteristics of quicklime-lateritic gravels mixtures used in road construction

2012 ◽  
Vol 26 (1) ◽  
pp. 663-669 ◽  
Author(s):  
Younoussa Millogo ◽  
Jean-Claude Morel ◽  
Karfa Traoré ◽  
Raguilnaba Ouedraogo
Keyword(s):  
Mechanical Characteristics ◽  
Road Construction

scholarly journals Impact of compaction method on mechanical characteristics of unbound granular recycled materials

2017 ◽  
Vol 19 (4) ◽  
pp. 912-934 ◽  
Author(s):  
Ehsan Yaghoubi ◽  
Mahdi M. Disfani ◽  
Arul Arulrajah ◽  
Jayantha Kodikara
Keyword(s):  
Mechanical Characteristics ◽  
Recycled Materials ◽  
Compaction Method

Recycled Materials as Substitutes for Virgin Aggregates in Road Construction: II. Inorganic Contaminant Leaching

2011 ◽  
Vol 75 (4) ◽  
pp. 1276-1284 ◽  
Author(s):  
Dong-Hee Kang ◽  
Satish C. Gupta ◽  
P. R. Bloom ◽  
Andry Z. Ranaivoson ◽  
Ruth Roberson ◽  
...  
Keyword(s):  
Road Construction ◽  
Recycled Materials ◽  
Inorganic Contaminant

EXPERIMENTAL STUDY OF THE EFFECT OF WATERPROOF MATERIAL ON WATER-THERMAL REGIME OF THE SOIL SAMPLE

2015 ◽  
Vol 5 (4) ◽  
pp. 53-58
Author(s):  
Tatiana Vladimirovna PERMITINA
Keyword(s):  
Experimental Study ◽  
Soil Sample ◽  
Active Layer ◽  
Thermal Regime ◽  
Mechanical Characteristics ◽  
Road Construction ◽  
The Road ◽  
Far North ◽  
Temperature And Humidity ◽  
Physical And Mechanical Characteristics

This article deals with the problem of water and thermal regime of subgrade of the road in the far north. The measures to regulate water and thermal regime of soil of roadbed are described. An experimental study to evaluate the effect of the waterproof materials on the temperature and humidity regime of the road construction. The tasks, aimed at identifying patt erns of change in the physical and mechanical characteristics and the migration of moisture in the subgrade of the road and in the active layer of permafrost, reinforced waterproof element, are set.

scholarly journals Reuse of Reclaimed Material in Road Construction Layers

2018 ◽  
Vol 26 (2) ◽  
pp. 40-44
Author(s):  
Petr Mondschein
Keyword(s):  
Czech Republic ◽  
Road Construction ◽  
Past Experience ◽  
Asphalt Pavements ◽  
Recycled Materials ◽  
Asphalt Mixes ◽  
The Czech Republic ◽  
Strong Interest ◽  
Technical Regulations

AbstractThe paper summarizes past experience in the use of reclaimed material in road construction layers according to various technologies applied in road construction. The recycling of asphalt pavements is a standard widely applied and established in road practice for many years. There is strong interest to increase the use of recycled materials in asphalt pavements for cost and environmental reasons. The paper defines the strengths and weaknesses of individual technologies and recommends where and when the use of R-material is appropriate, economically sound and technically justified. The production of new asphalt mixes with more reclaimed material is limited by more factors in the Czech Republic. They include the regulation of the quantity of reclaimed material in the standards and technical regulations. The machine equipment of contractors for recycling is not always sufficient either.

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