The effect of initial strength of concrete wastes on the fresh and hardened properties of recycled concrete reinforced with recycled steel fibers

2021 ◽  
Vol 300 ◽  
pp. 124284
Author(s):  
Amirhosein Sahraei Moghadam ◽  
Fereydoon Omidinasab ◽  
Mehdi Abdalikia
Keyword(s):  
Recycled Concrete ◽  
Steel Fibers ◽  
Initial Strength ◽  
Hardened Properties ◽  
Recycled Steel

Green Concrete made with Recycled Concrete Aggregates: Fresh and Hardened Properties

2018 ◽  
Author(s):  
Driton R. Kryeziu ◽  
Armend Muja ◽  
Fisnik Kadiu ◽  
Visar Krelani ◽  
Besian Sinani ◽  
...  
Keyword(s):  
Recycled Concrete ◽  
Green Concrete ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Hardened Properties

scholarly journals Shear Behavior of Steel-Fiber-Reinforced Recycled Aggregate Concrete Deep Beams

Buildings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 423
Author(s):  
Nancy Kachouh ◽  
Tamer El-Maaddawy ◽  
Hilal El-Hassan ◽  
Bilal El-Ariss
Keyword(s):  
Shear Behavior ◽  
Shear Capacity ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Steel Fibers ◽  
Recycled Aggregate ◽  
Shear Reinforcement ◽  
Deep Beams ◽  
Control Beam ◽  
Shear Response

Results of an experimental investigation aimed at studying the effect of steel fibers on the shear behavior of concrete deep beams made with a 100% recycled concrete aggregate (RCA) are presented in this paper. The study comprised testing of seven concrete deep beam specimens with a shear span-to-depth ratio (a/h) of 1.6. Two beams were made of natural aggregates (NAs) without steel fibers, two beams were made of a 100% RCA without steel fibers, and three beams were made of RCA-based concrete with steel fibers at volume fractions (vf) of 1, 2, and 3%. Two of the beams without steel fibers included a minimum shear reinforcement. Test results showed that the beam with a 100% RCA without steel fibers exhibited a lower post-cracking stiffness, reduced shear cracking load, and lower shear capacity than those of the NA-based control beam. The detrimental effect of the RCA on the shear response was less pronounced in the presence of the minimum shear reinforcement. The addition of steel fibers significantly improved the shear response of the RCA-based beams. The post-cracking stiffness of the RCA-based concrete beams with steel fibers coincided with that of a similar beam without fibers containing the minimum shear reinforcement. The use of steel fibers in RCA beams at vf of 1 and 2% restored 80 and 90% of the shear capacity, respectively, of a similar beam with the minimum shear reinforcement. The response of the RCA specimen with vf of 3% outperformed that of the NA-based control beam with the minimum shear reinforcement, indicating that steel fibers can be used in RCA deep beams as a substitution to the minimum shear reinforcement. The shear capacities obtained from the tests were compared with predictions of published analytical models.

Investigating the effects of recycled PET particles, shredded recycled steel fibers and Metakaolin powder on the properties of RCCP

2019 ◽  
Vol 224 ◽  
pp. 173-187 ◽  
Author(s):  
Reza Noroozi ◽  
Gholamali Shafabakhsh ◽  
Ali Kheyroddin ◽  
Abolfazl Mohammadzadeh Moghaddam
Keyword(s):  
Steel Fibers ◽  
Recycled Pet ◽  
Recycled Steel

Comparison of some Fresh and Hardened Properties of Self-Consolidating Concrete Composites Containing Rubber and Steel Fibers Recovered from Waste Tires

2019 ◽  
Vol 24 ◽  
pp. 8-13 ◽  
Author(s):  
Hamza Bensaci ◽  
Belkacem Menadi ◽  
Said Kenai
Keyword(s):  
Flexural Strength ◽  
Volume Fraction ◽  
Flow Time ◽  
Steel Fibers ◽  
Self Consolidating Concrete ◽  
Steel Fibres ◽  
Waste Tires ◽  
Slump Flow ◽  
Funnel Flow ◽  
Recycled Steel

This paper reports on an experimental investigation using either rubber aggregates or steel fibres recycled from waste tires in the production of self-consolidating concrete composite (SCCC). Ten mixes are designed, one of them is the reference concrete. The natural aggregates are substituted by rubber particles by volume at 5, 10, 15, 20 and 30%. Recycled steel fibres are separately added to SCC mixes at volume fraction of 0.5, 0.8, 1 and 1.5%. The tested rheological properties of SCCC are slump flow diameter, T500 slump flow time, V-funnel flow time, L-box ratio, and the segregation resistance test. The compressive strength, the flexural strength, and total shrinkage are also measured on the 28 days. The experimental results show that the addition of recycled steel fibre is favorable for the SCC by means of increasing the flexural strength and reducing the shrinkage and the risk of cracking. Keywords: Self-consolidating concrete composite; Waste tires; Rubber; Steel fibers; Rheology, Strength

EXPERIMENTAL STUDY ON RECYCLED CONCRETE WITH STEEL FIBERS AS A SUSTAINABLE BUILDING MATERIAL

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Olivia Mirza ◽  
Dane Wigg ◽  
Won Hee Kang ◽  
Sepani Senaratne ◽  
Vivian Tam ◽  
...  
Keyword(s):  
Natural Resources ◽  
Construction Industry ◽  
Construction Material ◽  
Experimental Studies ◽  
Recycled Concrete ◽  
Steel Fibers ◽  
Future Research ◽  
Sustainable Solutions ◽  
Structural Reinforcement ◽  
The Impact

The global demand for construction aggregate exceeds 26 billion tons per year. With global policy attention directed towards climate change, environmental and economic sustainability, changes are required to the Australian construction industry regarding the extraction of natural resources. In particular, the concrete industry requires seeking innovative, sustainable solutions for reducing the impact of construction and maintenance on the environment. The majority of structures in Australia use reinforced concrete. Therefore, using environmentally and economically sustainable materials such as recycled concrete in construction would preserve natural resources and reduce construction waste and overall costs. There is considerable research available on the use of recycled concrete as a construction material and the use of steel fibers as structural reinforcement has been studied since the 1960’s. However, there is very little research on the combination of the two as a construction material for concrete structures. This study focused on secondary beams made of recycled concrete with the incorporation of steel fibers. This combination offers a structurally sound material that will provide a durable and sustainable solution to Australian Construction Industry. Experimental studies were conducted to validate the performance of the new material in a structural application. Based on the results of the study, recommendations for future research and design applications using these materials are made.

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