Axial Compressive Behavior of Geopolymer Recycled Lump Concrete

Zhang, Haiyan; Liu, Jiancheng; Wu, Bo; Zhang, Zhijian

doi:10.3390/ma13030533

Cited by 5 publications

(4 citation statements)

References 39 publications

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“…It is worth noticing that identical observations were also reported in other experimental investigations, such as. 77,78 Moreover, it was found that the measured elastic modulus values of GPC were lower than those calculated using the Australian Standard AS3600 (2005), and the American Concrete Institute (ACI) Committee 363 (1992). 11 On the other hand, in Nath and Sarker, 15 the authors stated that the modulus of elastic of GPC was relatively less than that of OPC concrete of similar compressive strength (from about 25% to 31.1% depending on the testing age).…”

Section: Resultsmentioning

confidence: 93%

Calibration of a stress-strain response for geopolymer concrete under axial compressive load

Dao

Tran

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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The use of geopolymer concrete (GPC) in common load-bearing structures is still limited, mainly due to the lack of specific design procedures and limited understanding of the stress–strain behavior under uniaxial loading. The present work investigates the mechanical responses of GPC under axial compressive load by conducting a large number of experiments. For this purpose, 198 samples with three GPC mixes were designed, including concrete grades of 30, 40, and 50 MPa. The samples were prepared following the ASTM standards to determine the stress–strain relationship under compression. The results showed that fly ash-based GPC had average elastic modulus values of 30.424, 31.497, and 33.650 GPa, respectively, for G30, G40, and G50, lower than estimated using formulae for Ordinary Portland Cement (OPC) concrete, such as ACI standard 318-11, AASHTO-2007, and others. Furthermore, a novel model of GPC stress–strain response was proposed, mainly based on the empirical formulation suggested by Sargin using a modified factor D. Besides, the deformation of GPC was observed larger than that of OPC with similar strength, for instance, the strain at peak stress [Formula: see text]. The GPC was also found to have better plasticity behavior than OPC while conducting the axial stress–strain response, with the obtained values of [Formula: see text]. The findings of this work might lead to additional in-depth research into GPC's mechanical characteristics, particularly its structural behavior.

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Section: Resultsmentioning

confidence: 93%

Calibration of a stress-strain response for geopolymer concrete under axial compressive load

Dao

Tran

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Generally, the goal of such actions, which have been implemented for many years, is: to reduce the environmental pollution from cement production and the damage to natural resources from aggregate mining in the concrete industry [8], and to limit the use of natural raw materials needed for clinker burning (this process requires approximately 1.7 tons of raw materials, mainly limestone, per ton of clinker produced [9]; 6.97 bn tons per year), as a result of which it would be possible to reduce the amount of energy that is needed to produce cement and reduce the greenhouse gases (GHG) generated in these processes; mainly CO 2 . Therefore, the assumption of the production of low-emission cements would be possible with a reduction of the clinker/cement ratio to 0.7, which is supposed to happen in 2050.…”

Section: Figure 2 World Production Of Cement and Clinker By Country I...mentioning

confidence: 99%

Energy Savings Associated with the Use of Fly Ash and Nanoadditives in the Cement Composition

Golewski

2020

Energies

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The paper presented herein investigates the effects of using supplementary cementitious materials (SCMs) in quaternary mixtures on the compressive strength and splitting tensile strength of plain concrete. In addition, environmental benefits resulting from the proposed solutions were analysed. A total of four concrete mixtures were designed, having a constant water/binder ratio of 0.4 and total binder content of 352 kg/m3. The control mixture only contained ordinary Portland cement (OPC) as binder, whereas others incorporated quaternary mixtures of: OPC, fly ash (FA), silica fume (SF), and nanosilica (nS). Based on the obtained test results, it was found that concretes made on quaternary binders containing nanoadditives have very favorable mechanical parameters. The quaternary concrete containing: 80% OPC, 5% FA, 10% SF, and 5% nS have shown the best results in terms of good compressive strength and splitting tensile strength, whereas the worst mechanical parameters were characterized by concrete with more content of FA additive in the concrete mix, i.e., 15%. Moreover, the results of compressive strength and splitting tensile strength are qualitatively convergent. Furthermore, reducing the amount of OPC in the composition of the concrete mix in quaternary concretes causes environmental benefits associated with the reduction of: raw materials that are required for burning clinker, electricity, and heat energy in the production of cement.

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“…It is a new type of green building material. Compared with the compressive behavior of geopolymer recycled concrete and cement recycled concrete, Zhang found [26] that geopolymer recycled concrete possesses higher compressive strength than cement recycled concrete under the same experimental conditions, due to the strengthening effect of fresh geopolymer binding material. Moreover, a modified method for predicting the compressive strength of geopolymer recycled concrete cubic and cylindrical specimens was proposed.…”

Section: Introductionmentioning

confidence: 98%

Effects of a Water-Glass Module on Compressive Strength, Size Effect and Stress–Strain Behavior of Geopolymer Recycled Aggregate Concrete

Wang

Bian

et al. 2022

Crystals

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Geopolymer recycled aggregate concrete (GRAC) was prepared by replacing cement with geopolymer and natural aggregate with waste concrete. The effect of the water-glass module on the mechanical properties of GRAC was studied. It was found that water-glass has a double-layer structure. The low module water-glass leads to a thicker diffusion layer and more Na+ and OH− in the solution, which activates more CaO, SiO2, and Al2O3 in the raw material, and improves the strength of GRAC. Moreover, two kinds of gel structures, namely layered C-A-S-H (calcium silicate hydrate) and networked N-A-S-H (zeolite), were found in the products of geopolymer. As the water-glass module changed, the phase of zeolite changed significantly, whereas the calcium silicate hydrate did not change, indicating that the decrease in the water-glass module contributes to the formation of more N-A-S-H gel. The compressive strengths of GRAC with the sizes of 200, 150, and 100 mm3 were in line with Bazant’s size effect theoretical curve. Through the segmented fitting method, the relationship of the size conversion coefficient of GRAC (α), the critical strength (fcr), the critical dimension (Dcr), and the water-glass module (ε) were determined. It was found that ε = 1.5 is the segmented point of the three equations. The elastic modulus and peak stress of GRAC are inversely proportional to the water-glass module, and the peak strain is proportional to the water-glass module, indicating that by reducing the water-glass module, the strength of GRAC can be improved, but the brittleness is increased. The constitutive equation of GRAC with only the water-glass module as a variable was also established. It was found that the polynomial mathematical model and rational fraction mathematical model are optimal for the rising-stage and falling-stage, respectively, and the relationship between the parameters of the rising-stage (a) and the falling-stage (b), and the water-glass module, is given.

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Axial Compressive Behavior of Geopolymer Recycled Lump Concrete

Cited by 5 publications

References 39 publications

Calibration of a stress-strain response for geopolymer concrete under axial compressive load

Calibration of a stress-strain response for geopolymer concrete under axial compressive load

Energy Savings Associated with the Use of Fly Ash and Nanoadditives in the Cement Composition

Effects of a Water-Glass Module on Compressive Strength, Size Effect and Stress–Strain Behavior of Geopolymer Recycled Aggregate Concrete

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