Bio-mechanical efficacy for slag/fly ash-based geopolymer mingled with mesoporous NiO

Mohsen, Alaa; Kohail, Mohamed; Alharbi, Yousef R.; Abadel, Aref A.; Soliman, Ahmed M.; Ramadan, M.

doi:10.1016/j.cscm.2023.e02283

Cited by 7 publications

(3 citation statements)

References 91 publications

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“…The main target of several studies [1][2][3][4][5] is to adopt alternative-binder systems with such advantages as lower cost and environmental friendliness. It is important to use materials that also can improve the mechanical properties of cementitious materials without the need to increase the amount of cement, because of high CO2 emissions in cement manufacturing and higher cost of product.…”

Section: Introductionmentioning

confidence: 99%

Study on Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste

Antonovič,

Sikarskas,

Boris

et al. 2023

Preprint

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The influence of aluminosilicate pozzolanic waste, specifically spent fluid catalytic cracking catalyst (FCCW) and metakaolin waste (MK) from expanded glass industry, on the properties of hardened Portland cement paste were analysed. The study involved replacing part of cement with FCCW and MK and observing their impact on hydration, microstructure, density and compressive strength of hardened cement paste. Various analysis methods were employed, including X-ray diffraction (XRD), thermogravimetric analysis (TG), and scanning electron microscopy (SEM), to understand the changes in the structure of hardened cement paste during hydration. The findings revealed that FCCW tends to accelerate cement hydration process due to its high surface area and pozzolanic activity. Notably, the formation of portlandite crystals was observed on FCCW particle surfaces in a specific direction. These crystals appeared smaller and developed in different directions in compositions containing a composite binder with mixture of FCCW and MK in a ratio 1:1. This could be influenced by pozzolanic reactions activated by fine particles of MK and the formation of calcium silicate hydrates (CSH) and calcium alumino silicate hydrates (CASH) in the presence of portlandite. XRD and TG results indicated that the specimens containing a composite binder exhibited the least amount of portlandite. The compressive strength of these specimens increased compared to control specimens, although the amount of cement was 9% lower.

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Section: Introductionmentioning

confidence: 99%

Study on Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste

Antonovič,

Sikarskas,

Boris

et al. 2023

Preprint

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show abstract

“…The mechanical properties of cement-based materials are affected by many factors, including fineness, particle size, curing conditions, adhesive material type, and temperature [11][12][13]. Many scholars have studied cement-based materials' physical and chemical properties under different curing conditions by adding slag, fly ash, metakaolin waste, nanomaterials, and other materials and used SEM/EDX, XRD, TGA/DTG, resistivity, and other test methods to verify and analyze the unconfined compressive strength, viscosity value, yield strength, and other macromechanical properties of the enforcement [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Ultra-Fine Cement on the Microscopic Pore Structure of Cement Soil in a Peat Soil Environment

Cao,

Huang,

Sun

et al. 2023

Applied Sciences

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Treating peat soil foundations around Dianchi Lake and Erhai Lake in Yunnan is a complex problem in practical engineering projects. Peat soil solely reinforced with ordinary cement (OPC) does not satisfy demand. This study aims to solidify soil to achieve better mechanical properties. The preparation of peat soil incorporates a humic acid (HA) reagent into cohesive soil, and cement and ultra-fine cement (UFC) are mixed by stirring to prepare cement soil samples. They are then immersed in fulvic acid (FA) solution to simulate cement soil in the actual environment. X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), and pores and cracks analysis system (PCAS) tests are used to study the impact of the UFC on the microscopic pore structure of cement soil in a peat soil environment. The unconfined compressive strength (UCS) test is used for verification. The microscopic test results indicate that incorporating UFC enhances the specimen’s micropore structure. The XRD test results show the presence of C–S–H, C–A–S–H, and C–A–H. SEM and PCAS tests show that the UFC proportion increases by between 0% and 10%, and the percentage reduction in the macropore volume is the largest, at 38.84%. When the UFC admixture is 30%, the cumulative reduction in the percentage of macropore volume reaches 71.55%. The MIP test results show that the cumulative volume greater than 10 µm in pore size decreases from 7.68% to 0.17% with an increase in the UFC proportion. The UCS test results show that the maximum strength growth of cement soil is 12.99% when the UFC admixture is 0–10%. Incorporating UFC to form a compound curing agent solves the problem of the traditional reinforcement treatment of peat soil foundation being undesirable and decreases the amount of cement. This study provides practical guidance for reducing carbon emissions in actual projects.

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“…Concrete is one of the most extensively utilized building materials globally, and current research has continuously enriched the material composition and performance of concrete [1][2][3][4][5][6][7]. In the 1990s, Prof. Li of the University of Michigan developed ultra-hightoughness cementitious composites with tensile strain hardening characteristics and high toughness by using a micro-mechanics-based performance-driven design method.…”

Section: Introductionmentioning

confidence: 99%

Study on Influencing Factors of Hydraulic Engineered Cementitious Composites Layer Bonding Performance

Wang,

Li,

Shi

2023

Materials

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The layer bonding performance of hydraulic engineered cementitious composites (HECCs) plays an important role in their application in hydraulic buildings. This performance encompasses the bonding between layers of HECCs, as well as between HECCs and normal mortar (NM) layers. The influence of various factors on the layer bonding performance of HECCs was investigated. These factors included different pouring intervals (0 min, 20 min, 40 min, 60 min, 2.5 h, 7 days, 14 days, and 28 days), pouring directions (horizontal and vertical), degree of saturation (100%, 70%, 50%, 30%, and 0%), and surface roughness (varying sand-pour roughness). It was found that longer pouring interval times led to a decrease in the layer bonding performance, and the strength of the layer bonding fell below 50% compared to concrete without layers, with the lowest recorded strength being only 1.12 MPa. The layer’s horizontal flexural strength surpassed the vertical flexural strength, but the horizontal compressive strength fell below the vertical compressive strength. Additionally, the bonding performance of the substrate at 0% saturation was 15–20% lower compared to other saturation levels. Notably, roughness significantly enhanced the performance of HECC layers, with improvements reaching a maximum of 180–200%. Furthermore, the layer performance of HECCs and NM experienced an improvement of 20.5–37.5%.

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Bio-mechanical efficacy for slag/fly ash-based geopolymer mingled with mesoporous NiO

Cited by 7 publications

References 91 publications

Study on Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste

Study on Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste

Analysis of the Effect of Ultra-Fine Cement on the Microscopic Pore Structure of Cement Soil in a Peat Soil Environment

Study on Influencing Factors of Hydraulic Engineered Cementitious Composites Layer Bonding Performance

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