scholarly journals Sand Cement Brick Containing Recycled Concrete Aggregate as Fine-Aggregate Replacement

2017 ◽  
Vol 103 ◽  
pp. 01016 ◽  
Author(s):  
Faisal Sheikh Khalid ◽  
Herman Shah Herman ◽  
Nurul Bazilah Azmi ◽  
Mohd Irwan Juki
Keyword(s):  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Fine Aggregate ◽  
Recycled Concrete Aggregate

Recycling of Waste Concrete and Fly Ash for Recycled Aggregate Concrete: Fundamental Characteristics Evaluation

2009 ◽  
Vol 620-622 ◽  
pp. 255-258 ◽  
Author(s):  
Cheol Woo Park
Keyword(s):  
Fly Ash ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Experimental Program ◽  
Concrete Aggregate ◽  
Fine Aggregate ◽  
Recycled Concrete Aggregate ◽  
Aggregate Concrete ◽  
Waste Concrete

As the amount of waste concrete has been increased and recycling technique advances, this study investigates the applicability of recycled concrete aggregate for concrete structures. In addition fly ash, the industrial by-product, was considered in the concrete mix. Experimental program performed compressive strength and chloride penetration resistance tests with various replacement levels of fine recycled concrete aggregate and fly ash. In most case, the design strength, 40MPa, was obtained. It was known that the replacement of the fine aggregate with fine RCA may have greater influence on the strength development rather than the addition of fly ash. It is recommended that when complete coarse aggregate is replaced with RCA the fine RCA replacement should be less than 60%. The recycled aggregate concrete can achieve sufficient resistance to the chloride ion penetration and the resistance can be more effectively controlled by adding fly ash. It I finally conclude that the recycled concrete aggregate can be successfully used in the construction field and the recycling rate of waste concrete and flay ash should be increased without causing significant engineering problems.

Utilization of Fine Recycled Aggregate and the Calcareous Fly Ash in CLSM Manufacturing

2014 ◽  
Vol 1054 ◽  
pp. 199-204 ◽  
Author(s):  
Wojciech Kubissa ◽  
Roman Jaskulski ◽  
Jacek Szpetulski ◽  
Anna Gabrjelska ◽  
Ewelina Tomaszewska
Keyword(s):  
Fly Ash ◽  
Fine Fraction ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Concrete Aggregate ◽  
Fine Aggregate ◽  
Recycled Concrete Aggregate ◽  
River Sand ◽  
Wide Range ◽  
Strength Material

In the article the possibility of utilization of two waste materials: Recycled Concrete Aggregate (RCA) fraction 0-2 mm and Class C fly ash (from lignite burning power plant) in Controlled Low-Strength Material (CLSM) was presented. The research covered twelve different mixtures. The mixtures differed in cement and fly ash content as well as content of the fine aggregate. As a fine aggregate 0-2 mm fraction of RCA or river sand were used. The results showed that use the fine fraction RCA instead of sand does not cause technological problems and allows, depending on the needs, obtaining the material with different properties and a wide range of applications.

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 Pre-Wetting of Recycled Concrete as Alternative of Chemical, Natural and Industrial Waste Additives

2019 ◽  
Vol 8 (12) ◽  
pp. 743-748
Keyword(s):  
Compressive Strength ◽  
Analytical Study ◽  
Recycled Concrete ◽  
Silica Sand ◽  
Concrete Aggregate ◽  
Fine Aggregate ◽  
Recycled Concrete Aggregate ◽  
Arab Region ◽  
Super Plasticizer ◽  
Day By Day

Destructive infrastructure is increasing day by day due to the successive wars in the Arab region and this led to the formation of large volumes of demolished concrete, which produces a lot of waste materials and visual pollution in the spaces. Meanwhile, environmental protection has become a challenge, not an option. As well as, reusing of demolished concrete in new structures is necessary to preserve the raw resources of aggregate away from attrition. Seventy-two specimens of ( 100 x 100 x 100 mm ) were prepared with water to cement ( W/C ) ratio of 0.4, where have replaced the different proportions of natural aggregate ( NA ) ( 0%, 30%, 45%, and 60% ) by recycled concrete aggregate ( RCA ), and then were added 2.5% super plasticizer ( SP ) in place of cement to other specimens according to previous replacement proportion of RCA to determine the optimum percentage of RCA and to investigate the effectiveness of using Super Plasticizer. The replacement proportion of RCA were 45% of NA. sixty six cubes of 45% - RCA were prepared with a different proportions of 0, 10, 15, and 20 % of instead of a fine aggregate for each the Iron Filler ( IF ) and Al-Qawirah Silica Sand (QSS), it is natural Silica was got from the quarry of AL-Qawirah, Jordan. The use of this type of silica as a substitute for fine aggregate with RCA is the first use in Jordan. The final stage of research was the pre-wetting of RCA by 0%, 2.5%, 5%, and 7.5% as percentage of W/C, it is an extra water added to the 45%-RCA mixtures before an hour from mix process, thirty-six cubes were casted with different proportions of extra water. The results displayed that the workability was reduced by increasing the RCA, while the workability was increase as ratios of W/C increase. The analytical study shows a considerable enhancement of the compressive strength of 2.5% pre-wetting of RCA with 45%-RCA relative to the SP, IF, and NA, where the increase in the compressive strength was 64% and 28% at 2.5% pre-wetting of RCA relative to SP-45% RCA and NA, respectively

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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