Study on fresh and mechanical properties for different grades of geopolymer concrete with recycled coarse aggregate

Kumar, Vanadi Vinay; Bhikshma, V.; Prasad, B. Vijaya

doi:10.1016/j.matpr.2022.02.326

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…The results showed that the GPNAC slump flow values were larger than those of GPRAC regardless of the variation of the SH solution concentration [ 57 ]. Vinay Kumar et al [ 58 ] found that the slump of different grades of recycled coarse aggregate (RC) based GPC decreased with increasing content of ground granulated blast furnace slag (GGBFS). Figure 1 shows the slump of different mixtures, in which W/B indicates water/binder ratio.…”

Section: Physical Properties Of Gpracmentioning

confidence: 99%

“…However, too high temperatures can lead to crack generation as well as weakening of the structure [ 84 , 86 ]. Since the geopolymerization reaction is generally largely completed in the first seven days, the compressive strength of GPRAC first increases rapidly and then stabilizes as the age increases [ 58 , 80 , 82 ]. Sata et al [ 74 ] showed that the optimum SH concentration to produce high strength pressed geopolymer concrete was 15–20 M regardless of whether the aggregates were NA, RA or recycled concrete block aggregate.…”

Section: Mechanical Properties Of Gpracmentioning

confidence: 99%

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Mechanical Properties and Durability of Geopolymer Recycled Aggregate Concrete: A Review

et al. 2023

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Geopolymer recycled aggregate concrete (GPRAC) is a new type of green material with broad application prospects by replacing ordinary Portland cement with geopolymer and natural aggregates with recycled aggregates. This paper summarizes the research about the mechanical properties, durability, and microscopic aspects of GPRAC. The reviewed contents include compressive strength, elastic modulus, flexural strength, splitting tensile strength, freeze–thaw resistance, abrasion resistance, sulfate corrosion resistance, and chloride penetration resistance. It is found that GPRAC can be made to work better by changing the curing temperature, using different precursor materials, adding fibers and nanoparticles, and setting optimal mix ratios. Among them, using multiple precursor materials in synergy tended to show better performance compared to a single precursor material. In addition, using modified recycled aggregates, the porosity and water absorption decreased by 18.97% and 25.33%, respectively, and the apparent density was similar to that of natural aggregates. The current results show that the performance of GPRAC can meet engineering requirements. In addition, compared with traditional concrete, the use of GPRAC can effectively reduce carbon emissions, energy loss, and environmental pollution, which is in line with the concept of green and low-carbon development in modern society. In general, GPRAC has good prospects and development space. This paper reviews the effects of factors such as recycled aggregate admixture and curing temperature on the performance of GPRAC, which helps to optimize the ratio design and curing conditions, as well as provide guidance for the application of recycled aggregate in geopolymer concrete, and also supply theoretical support for the subsequent application of GPRAC in practical engineering.

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Section: Physical Properties Of Gpracmentioning

confidence: 99%

Section: Mechanical Properties Of Gpracmentioning

confidence: 99%

Mechanical Properties and Durability of Geopolymer Recycled Aggregate Concrete: A Review

et al. 2023

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“…This leads to the failure of RCA to completely replace NCA, thus limiting its many engineering applications [ 3 ]. Some studies have found that the physical and mechanical properties of RCA are inferior to those of NCA [ 4 ], and the direct use of RCA to make concrete will reduce its compressive strength, splitting strength, and workability [ 5 , 6 ]. Many studies have been published on the important effects of the ITZ properties on the mechanical properties of concrete.…”

Section: Introductionmentioning

confidence: 99%

The Mechanical Properties and Microstructure of Tailing Recycled Aggregate Concrete

Xu,

Li,

et al. 2024

Materials

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The aim of this study was to develop sustainable concrete by recycling concrete aggregates from steel waste and construction waste (iron ore tailings (IOTs) and recycled coarse aggregates (RCAs)) to replace silica sand and natural coarse aggregates. In experimental testing, the compressive strength, peak strain, elastic modulus, energy dissipated under compression, and compressive stress–strain curve were analyzed. Microscopically, scanning electron microscopy and energy-dispersive spectrometry were employed to investigate the microstructural characteristics of the interfacial transition zone (ITZ), and the results were compared with the ITZs of natural aggregate concrete and recycled aggregate concrete (RAC). In addition, the pore structure of concrete was determined by nuclear magnetic resonance. The results revealed that an appropriate IOT content can improve the ITZ and compactness of RAC, as well as optimize the mechanical and deformation properties of RAC. However, due to the presence of a smaller number of microcracks on the surface of IOT particles, excessive IOTs could reduce the integrity of the matrix structure and weaken the strength of concrete. According to the research, replacing silica sand with 30% IOTs led to a reduction in the porosity and microcracking which resulted in a much denser microstructure.

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Modelling the compressive strength of geopolymer recycled aggregate concrete using ensemble machine learning

Golafshani,

Khodadadi,

Ngo

et al. 2024

Advances in Engineering Software

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Study on fresh and mechanical properties for different grades of geopolymer concrete with recycled coarse aggregate

Cited by 6 publications

References 16 publications

Mechanical Properties and Durability of Geopolymer Recycled Aggregate Concrete: A Review

Mechanical Properties and Durability of Geopolymer Recycled Aggregate Concrete: A Review

The Mechanical Properties and Microstructure of Tailing Recycled Aggregate Concrete

Modelling the compressive strength of geopolymer recycled aggregate concrete using ensemble machine learning

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