Improving bond strength of recycled coarse aggregate concrete using chopped basalt fibers

Shatarat, Nasim; Katkhuda, Hasan; Ayyoub, Mohammed; Al-Hunaiti, Yasser; Abdel-Jaber, Ma’en

doi:10.1016/j.cscm.2022.e01449

Cited by 5 publications

(3 citation statements)

References 45 publications

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“…The quality of RCA depends on various factors such as the quality of the parent aggregates used in the concrete mix before, the quantity of mortar present in the RCA, and the type of cement used in the parent concrete. [35]. Moreover, the use of RCA in concrete reduces the compressive strength, tensile strength, elastic modulus, and flexural strength [34,36].…”

Section: Research Objectivesmentioning

confidence: 99%

A Sustainable and Environmentally Friendly Concrete for Structural Applications

Phuyal,

Sharma,

Mahar

et al. 2023

Sustainability

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The purpose of this study is to utilize waste products—precipitated calcium carbonate (PCC) and upcycled recycled concrete aggregate (upcycled RCA or UCA)—in civil works projects. To do so, tests must be performed to determine the engineering properties of the materials in which PCC and UCA are sequestered. PCC is a fine to coarse grain waste product generated during the production of sugar from sugar beets. UCA is produced from demolished and returned concrete by the extraction of primarily calcium and alkalinity. The study also includes the use of both PCC and UCA in the same concrete mix design. The test results on PCC alone show that the optimum content to achieve a minimum 28 MPa (4000 psi) compressive strength is 25% and 30%. The corresponding compressive strength of mixes in which conventional aggregate was replaced by UCA is about 48 MPa (7000 psi) to 55 MPa (8000 psi) at the same water: cement ratio (0.44) by weight. The compressive strength of concrete with 25% to 30% cement replaced by PCC and varying aggregates replaced with UCA ranges from 19.3 to 40 MPa (2800 to 5800 psi). Other tests on PCC and UCA include tensile strength of 2 to 3 MPa (293 to 423 psi) and flexural strength of 1.3 to 1.9 MPa (183 to 279 psi). Analytical techniques such as X-ray diffraction (XRD), energy-dispersive X-ray spectrometry (EDX), and scanning electron microscopy (SEM) were used to identify the constituent elements and chemical compounds present in PCC, including calcium carbonate and silica. Based on the test results, the composition of PCC by weight indicates 45.9% calcium, 39.4% oxygen, and 9.2% carbon. Based on the results of this study, we can expect to reduce carbon emissions in the production of cement and aggregates, as well as utilize waste products in the civil engineering field.

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Section: Research Objectivesmentioning

confidence: 99%

A Sustainable and Environmentally Friendly Concrete for Structural Applications

Phuyal,

Sharma,

Mahar

et al. 2023

Sustainability

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“…For the time being, sustainability, Eco-friendly and decrease the economic cost manufacturing of prestressed concrete we have to adopt a new methodology like in the present contest replacement of RCA with the normal concrete in the PSC, the Recycled Coarse Aggregate needs to meet the requirements and serviceability conditions of the prestressed concrete such as high grade of concrete and decreased tensile stresses and cracks in the concrete. The bond between steel bars and concrete is very essential factor that affects the structural behavior of reinforced concrete (RC) elements, [7]…”

Section: Introductionmentioning

confidence: 99%

Influence of Recycled Coarse Aggregates in the Application of Prestressed Concrete Members-A Review

Bhargav,

Senthil

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Currently the use of Pre-stressed Concrete (PSC) has increased globally because of its effectiveness in increasing the utilization area and strength of structural members than with the usage of conventional Reinforced concrete. However due to the increase in the cost of construction, sustainable methods such as the usage of Recycled Coarse Aggregate (RCA) in place of normal aggregate have to be practiced. In this context, a review is made to know the feasibility, advantages, and disadvantages of using RCA for PSC. The requirement of Physical-Mechanical properties of concrete for PSC is compared with the properties of RCA Concrete. Serviceability and durability requirements (high compressive strength, high bond strength, low creep, and shrinkage) of Pre-stressed Concrete by using RCA and rate of change of the strength of PSC with partial replacement of coarse aggregate with RCA after 7 days is studied. It is concluded that with an increase in percentage in replacement with RCA there is a decrease in compressive strength and increase in creep and shrinkage. It is also concluded that the bond strength between reinforcement and matrix wholly depends on the compressive strength of concrete. It is suggested that the modified EMV (Equivalent mortar volume) for the mix design of concrete was found to be an increased performance than the conventional method. It is also concluded that the RCA from old precast members and admixtures such as fly ash, slag, and silica fume decrease the shrinkage and creep strain. Ultimately RCA from the existing PSC members decreases the losses in the prestress members, for effective utilization of prestress in the concrete RCA replacement up to 30% found to perform well.

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“…The quality and mechanical characteristics of RAC were considerably improved by the application of low concentration acid. Shatarat et al [28] explored the impact of BF on the bond strength of RAC. The outcomes indicated that the RAC's bond strength increased as the BF content increased.…”

Section: Introductionmentioning

confidence: 99%

Study on Eccentric Compression Mechanical Characteristics of Basalt Fiber-Reinforced Recycled Aggregate Concrete-Filled Circular Steel Tubular Column

Zhang,

Niu,

Qiao

et al. 2023

Coatings

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During this study, eight basalt fiber-reinforced recycled aggregate concrete-filled circular steel-tubular (C-BFRRACFST) column specimens were subjected to eccentric compression tests with different replacement ratios of recycled coarse aggregate (RCA), basalt fiber (BF) contents, length-diameter (L/D), and eccentricity. The whole process of stress as well as failure mode of the specimens were observed, and a load–displacement curve as well as a load–strain curve for the specimens were measured. The impacts of various parameters upon the bearing capacity, peak displacement, and ductility coefficient of the specimens were analyzed. Subsequently, a 3D finite element model of the C-BFRRACFST column was established, and the whole process of stress was simulated. Based on the finite element simulation results, the N/Nu-M/Mu correlation strength curve of the C-BFRRACFST columns was verified. The exploration demonstrated that under eccentric load, the C-BFRRACFST column eventually underwent destruction of the overall instability. The load–axial displacement curve was characterized as three stress stages: elastic, elastic–plastic, declining, as well as declining stages. The strain of the mid-span section for the specimens follows the plane section assumption, and the lateral deflection basically follows the sine waveform curve. The ultimate bearing capacity of the specimens exhibited little change as the replacement ratio of RCA improved, while the ductility progressively reduced. Furthermore, the ultimate bearing capacity of the specimens failed to be obviously changed as the BF content enhanced, while the ductility progressively rose. Increasing the L/D gradually reduced the specimen’s ultimate bearing capacity alongside its ductility. The corrected N/Nu-M/Mu curve agreed well with the findings of finite element simulation.

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Improving bond strength of recycled coarse aggregate concrete using chopped basalt fibers

Cited by 5 publications

References 45 publications

A Sustainable and Environmentally Friendly Concrete for Structural Applications

A Sustainable and Environmentally Friendly Concrete for Structural Applications

Influence of Recycled Coarse Aggregates in the Application of Prestressed Concrete Members-A Review

Study on Eccentric Compression Mechanical Characteristics of Basalt Fiber-Reinforced Recycled Aggregate Concrete-Filled Circular Steel Tubular Column

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