scholarly journals Potential of Natural and Recycled Concrete Aggregate Mixtures for Use in Pavement Structures

Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 744
Author(s):  
Olivera Đokić ◽  
Aleksandar Radević ◽  
Dimitrije Zakić ◽  
Božidar Đokić
Keyword(s):  
High Water ◽  
Recycled Concrete ◽  
Partial Substitution ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Rigid Pavement ◽  
Traffic Loads ◽  
Granular Mixtures ◽  
Pavement Engineering ◽  
Pavement Structures

This study investigates the feasibility of using recycled concrete aggregate (RCA) as a partial substitution of natural aggregate in pavement engineering. Despite RCA’s good properties, such as polishing value and freeze-thaw resistance, its use is limited by low resistance to fragmentation and high-water absorption. This paper parent the experimental results of mineralogical-petrographic and physical-mechanical properties of RCA, natural stone (dolerite) and their combination (RCA content—15%, 30%, 45%, and 60%). The tested granular mixtures showed good resistance to fragmentation and wear (LA 22–27%, MDE 14–15%), as well as satisfactory Polished Stone Value of 55–57, which means they can be used in different layers of pavement structures. According to the obtained testing results, the application of RCA is possible in different flexible and rigid pavement layers and for various traffic loads.

scholarly journals Concrete with Partial Substitution of Waste Glass and Recycled Concrete Aggregate

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 430
Author(s):  
Jawad Ahmad ◽  
Rebeca Martínez-García ◽  
Jesús de-Prado-Gil ◽  
Kashif Irshad ◽  
Mohammed A. El-Shorbagy ◽  
...  
Keyword(s):  
Performance Test ◽  
Coarse Aggregate ◽  
Mechanical Performance ◽  
Negative Impact ◽  
Strength Properties ◽  
Waste Glass ◽  
Recycled Concrete ◽  
Partial Substitution ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate

The current practice of concrete is thought to be unsuitable because it consumes large amounts of cement, sand, and aggregate, which causes depletion of natural resources. In this study, a step towards sustainable concrete was made by utilizing recycled concrete aggregate (RCA) as a coarse aggregate. However, researchers show that RCA causes a decrease in the performance of concrete due to porous nature. In this study, waste glass (WG) was used as a filler material that filled the voids between RCA to offset its negative impact on concrete performance. The substitution ratio of WG was 10, 20, or 30% by weight of cement, and RCA was 20, 40, and 60% by weight of coarse aggregate. The slump cone test was used to assess the fresh property, while compressive, split tensile, and punching strength were used to assess the mechanical performance. Test results indicated that the workability of concrete decreased with substitution of WG and RCA while mechanical performance improved up to a certain limit and then decreased due to lack of workability. Furthermore, a statical tool response surface methodology was used to predict various strength properties and optimization of RCA and WG.

scholarly journals Asphalt Mixes Processed with Recycled Concrete Aggregate (RCA) as Partial Replacement of the Natural Aggregate

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4196
Author(s):  
Carlos U. Espino-Gonzalez ◽  
Wilfrido Martinez-Molina ◽  
Elia M. Alonso-Guzman ◽  
Hugo L. Chavez-Garcia ◽  
Mauricio Arreola-Sanchez ◽  
...  
Keyword(s):  
Research Work ◽  
Construction Materials ◽  
Recycled Concrete ◽  
International Standards ◽  
Partial Substitution ◽  
Partial Replacement ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Asphalt Mixes ◽  
Natural Aggregate

Materials play a fundamental role in any branch of civil engineering. From ancient times to the present day, society has required enormous amounts of construction materials, which implies an excessive exploitation of the natural environment. The present research work consisted in the design and development of asphalt mixes with a partial substitution of the natural aggregate (NA) by means of recycled concrete aggregate (RCA). The mix was designed with the Marshall methodology, considering the next percentages of substitution and addition by mass: 90% NA and 10% RCA; 80% NA and 20% RCA; 70% NA and 30% RCA. The mixtures were elaborated and analysed under the international standards and the Mexican regulation of the Communications and Transport Ministry, to determine the best option regarding their performance. The materials were characterized according to the current regulations and later employed in the mixes design. A total of 38 specimens were elaborated for each mixture, determining the optimum asphalt content; after that, mechanical tests were performed to analyse and determine the best results. In the aftermath of the examination of all mixtures, we concluded that the 70%AN/30%RCA is the best alternative option according to its performance and numeric results, complying with the cited regulations, and allowing a lower content of asphalt during the process.

The Optimum Replacement of Fine Recycled Concrete Aggregate on the Compressive and Splitting Tensile Strength of the Concrete

2020 ◽  
Vol 12 (9) ◽  
Author(s):  
Z. Zaki ◽  
◽  
F. S. Khalid ◽  
N. A. A. Guntor ◽  
, A. J. L. Meng Siang ◽  
...  
Keyword(s):  
Concrete Strength ◽  
High Water ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Fine Aggregate ◽  
Recycled Concrete Aggregate ◽  
Normal Concrete ◽  
Relevant Fact ◽  
Increasing Demand ◽  
The Right

The increasing demand of new construction, the more amount of natural materials was used. This is because, quick populace development and urbanization dramatically affect the expanded interest for development of construction market. Due to this case, many countries were forced to rearrange, renovate and also demolished old building to design a new concept of building that covered more occupants in building than old building concept. There was a high mindfulness on the need to give elective utilization to reused materials, particularly in the development of construction field. This resulted in the idea of making use of fine recycled concrete aggregate (FRCA) in the concrete as fine aggregate replacement. It had been proved that with the right percentage of FRCA replacement can produce a concrete which performed better than the normal concrete. Most of the previous studies agreed that the replacement should took place within the range of 10% - 30% to make the concrete work optimally. However, within that range, the best optimal replacement shows on the 20% as there is no decreases in concrete strength. It was also found that the density of FRCA concrete was lower than the normal concrete due to the porosity properties of FRCA resulted to the high-water absorption rate. The physical properties of FRCA somehow tends to effecting the concrete performance positively and also negatively, that is why it is vital to get a better understanding about the recycled concrete aggregate (RCA) so that it could be used and provide a clear relevant fact for the industries to start review the existing regulation and consider the use of RCA in the concrete making.

scholarly journals Use of Prefabrication, Construction and Demolition Wastes as an Aggregate in Vibropressed Precast Concrete Blocks Production

2022 ◽  
Vol 11 (1) ◽  
pp. 20-28
Author(s):  
Grzegorz Łój ◽  
Wiesława Nocuń-Wczelik
Keyword(s):  
Precast Concrete ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Partial Substitution ◽  
Concrete Aggregate ◽  
Recycled Concrete Aggregate ◽  
Concrete Technology ◽  
Natural Sand ◽  
Natural Aggregate ◽  
Concrete Blocks

The aim of current study was to determine the recycled concrete aggregate (RCA) applicability in the production of concrete mixture for vibropressed concrete blocks. The experiments were focused especially on the crushed waste material from the same concrete elements producing plant.  For this type of precast elements only some finer fractions can be implemented and the “earth-moist” consistency of fresh mixture is required. The series of samples was prepared in which the mixture of natural aggregates was partially or totally substituted by recycled concrete aggregate. The 0/4 RCA fraction, which is usually rejected in ready mix concrete technology, plays a role of 0/2 sand.  The substitution of sand fraction was from 20% to 100% respectively. The substitution of the coarser aggregate fractions by 4/16 RCA was also done. The standard properties of vibropressed elements, such as the degree of densification, the density of material, the compressive and splitting tensile strength and the water absorption capacity according to the relevant standards were determined. The parameters of materials with the natural aggregate substitution by RCA are affected by the ratio of recycled concrete aggregate. In most cases the results do not decline specially from those for reference samples, when only the natural sand (0/2) fraction is substituted by the 0/4 recycled aggregate. As one could expect, as lower the substitution, as better the test results. The partial substitution of natural aggregate by coarser fractions requires experimental verification; over 20% substitution of natural aggregate by 4/8, 8/16 or 0/16 RCA should be excluded.

Use of High Percentage of Recycled Concrete Aggregate in Aircraft Stand Rigid Pavement

2013 ◽  
Vol 723 ◽  
pp. 1084-1091 ◽  
Author(s):  
Nyok Yong Ho ◽  
Yang Pin Kelvin Lee ◽  
Tien Fang Fwa ◽  
Jun Yew Tan ◽  
Wee Fong Lim ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Laboratory Tests ◽  
Drying Shrinkage ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Chloride Ingress ◽  
Recycled Concrete Aggregate ◽  
Rigid Pavement ◽  
Study Laboratory

This paper describes a study that was carried to investigate the use of recycled concrete aggregate (RCA) in aircraft stand rigid pavement at the Singapore Changi Airport. The study aimed to recycle the concrete waste generated from the demolition of the existing aircraft stand rigid pavement to reconstruct the aircraft stand rigid pavement. The study was a continuation of a previous work in which 20% of RCA was used in the rigid pavement. In this study, laboratory tests were carried out to evaluate the use of up to 100% of RCA in rigid pavement. The test properties that were evaluated include compressive strength, flexural strength, drying shrinkage and resistance to chloride ingress. The study showed that it is viable to incorporate high RCA content in concrete.

scholarly journals Physical, Deformation, and Stiffness Properties of Recycled Concrete Aggregate

2021 ◽  
Vol 13 (8) ◽  
pp. 4245
Author(s):  
Katarzyna Gabryś ◽  
Emil Soból ◽  
Wojciech Sas
Keyword(s):  
Recycled Concrete ◽  
Experimental Program ◽  
Concrete Aggregate ◽  
Test Results ◽  
Recycled Concrete Aggregate ◽  
Granulometric Analysis ◽  
Stiffness Properties ◽  
Grain Distribution ◽  
Natural Aggregates ◽  
Critical Reduction

The construction sector is currently struggling with the reuse of waste originating from the demolition and modernization of buildings and roads. Furthermore, old buildings are gradually being replaced by new structures. This brings a significant increase of concrete debris to waste landfills. To prevent this, many studies on the possibilities of recycling concrete, known as recycled concrete aggregate (RCA), have been done. To broaden the applicability of reused concrete, an understanding of its properties and engineering behavior is required. A difficulty in sustainable, proper management of RCA is the shortage of appropriate test results necessary to assess its utility. For this reason, in the present study, the physical, deformation, and stiffness properties of RCA with gravely grain distribution were analyzed carefully in the geotechnical laboratory. To examine the mentioned properties, an extensive experimental program was planned, which included the following studies: granulometric analysis, Proctor and oedometer tests, as well as resonant column tests. The obtained research results show that RCA has lower values of deformation and stiffness parameters than natural aggregates. However, after applying in oedometer apparatus repetitive cycles of loading/unloading/reloading, some significant improvement in the values of the parameters studied was noticed, most likely due to susceptibility to static compaction. Moreover, some critical reduction in the range of linear response of RCA to dynamic loading was observed.

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