Related references
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Article
Environmental Sciences
Karthiga Shenbagam Natarajan et al.
Summary: Ordinary Portland cement concrete is widely used in construction worldwide, but its manufacturing process produces a significant amount of CO2 emissions and pollution. To address this issue, researchers have developed geopolymer concrete, which has higher strength compared to traditional concrete. Geopolymer concrete shows promising performance in various tests and could potentially reduce the environmental impact of construction.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Civil
Ahmet Ozbayrak et al.
Summary: Fly ash-based geopolymer has gained attention as an alternative binder with low emissions in concrete production. Studies on the design and mechanical properties of fly ash geopolymer concrete are important for increasing its use.
Article
Construction & Building Technology
Ferhat Cecen et al.
Summary: The polymerization process of geopolymer concrete is fundamentally different from the hydration process of ordinary Portland cement concrete. However, there is limited information available on the modal characteristics of geopolymer concrete in the existing literature. This study aims to address this gap and investigate the effect of geopolymer concrete component ratios on modal characteristics. Experimental modal analysis was performed on large-scale heat-cured low-calcium fly ash-based geopolymer concrete mix variations. The results show that analyzing the total water content from the activators and the pure chemical dosages provides more meaningful insights than the traditional A ratio. Increasing the dosage of pure sodium silicate generally increases damping but decreases the resonance frequency and dynamic elasticity modulus. These findings provide valuable information for the appropriate design of sustainable geopolymer concrete against dynamic loads.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Engineering, Civil
Ali Ihsan Celik et al.
Summary: The workability and compressive strength of geopolymer concrete were studied by adjusting the ratio of alkali activators (Na2SiO3/NaOH), the ratio of total solutions to fly ash, and the water content of the aggregate. It was found that the water content of the aggregate significantly affects the workability and compressive strength of geopolymer concrete. Moreover, reducing the Na2SiO3/NaOH ratio results in faster concrete setting time, increased compressive strength, and modulus of elasticity. Increasing the ratio of total solutions to fly ash prolongs setting time, decreases strength and modulus of elasticity, and increases strain at maximum stress. Therefore, geopolymer concrete exhibits higher strain at maximum compressive strength and lower modulus of elasticity compared to ordinary Portland cement concrete.
CANADIAN JOURNAL OF CIVIL ENGINEERING
(2023)
Article
Materials Science, Ceramics
Jhutan Chandra Kuri et al.
Summary: This study examined the durability of geopolymer mortar made from ground ferronickel slag (GFNS) and fly ash (FA) after being immersed in 5% sodium sulphate solution for 1.5 years. The results showed that the compressive strength of the samples increased after the immersion. The geopolymer mortar containing 75% GFNS exhibited the highest compressive strength after exposure to sulphate. The presence of stable sodium magnesium alumino-silicate hydrate (NMASH) product was attributed to the high strength of the FA-GFNS geopolymer.
CERAMICS INTERNATIONAL
(2023)
Article
Construction & Building Technology
Yongrui Wang et al.
Summary: In this study, a phosphogypsum-based geopolymer (PBG) cement was created by mixing beta-hemihydrate phosphogypsum (beta-HPG), slag, fly ash (FA), and alkali activator. The effects of slag and FA content, citric acid and sodium metasilicate dosage, and water addition process were investigated. The results showed that the cement could achieve a 28-day unconfined compressive strength (UCS) exceeding 60 MPa with a reasonable mix proportion. The main hydration products of the PBG cement were dihydrate phosphogypsum, ettringite, and C-S-H gel, which collectively contributed to its strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Dan Li et al.
Summary: A novel framework was developed in this study for damage location, quantification and characterization of steel-concrete composite beams using acoustic emission (AE) measurements. The damage-induced AE sources were located more accurately based on empirical wavelet transform (EWT), Akaike information criterion (AIC) and genetic algorithm (GA). With the coordinates of located AE events, the macrocrack and debonding surfaces were estimated by hybrid hierarchical-k-means clustering analysis.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Marziyeh Ghasemi et al.
Summary: This study investigates the behavior of a cost-effective and easy-to-install displacement-restraint cable bracing technique (cable-cylinder) for seismic upgrading of RC frames. The results reveal that cable cylinder braces have increased the first-story column shear more than regular cable braces, while lowering the maximum compression force of the adjacent column. This technique has significant implications for improving the performance of RC frames.
ENGINEERING STRUCTURES
(2023)
Review
Chemistry, Physical
Besarion Meskhi et al.
Summary: The concept of sustainable development aims to find environmentally friendly alternatives to traditional materials and technologies, such as geopolymer concretes, which reduce CO2 emissions, minimize environmental pollution, and lower energy and production costs. Geopolymer concrete is a sustainable substitute for ordinary Portland cement, with superior strength and deformation properties due to its stable aluminosilicate microstructure. The composition and proportions of the mixture significantly affect the properties and durability of geopolymer concretes. This study provides a comprehensive analysis of the structure formation processes, composition selection, and polymerization of geopolymer concretes. It also examines their potential applications, including nanomodification, 3D printing, and self-sensitive monitoring of structures.
Article
Materials Science, Multidisciplinary
Yasin Onuralp Ozkilic et al.
Summary: The influence of waste glass aggregate (WGA) with fly ash in certain proportions on geopolymer concrete (GPC) was studied by varying the molarity and WGA proportion. Tests on workability, setting time, compression strength (CS), splitting tensile (ST), and flexural strength (FS) were performed, and the results showed that slump values increased with higher molarity and lower WG percentages. CS, ST, and FS tended to decrease with increasing proportion, but increased with higher NaOH molarity. An equation was derived to predict the compressive strength of the geopolymer mixture used in this study.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Qiuying Chang et al.
Summary: The increasing demand for natural resources, especially as cement ingredients, in the growing construction sector, along with the negative impact of cement production on climate change, has led to the exploration of utilizing ceramic waste as a partial cement replacement. In this study, supervised machine learning algorithms were employed to predict the compressive strength of ceramic waste powder concrete, with the random forest algorithm showing the most effective performance. The application of machine learning techniques in civil engineering can help conserve resources and time.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Ali Ihsan Celik et al.
Summary: The influence of waste glass powder (WGP) and fly ash in different proportions on geo-polymer concrete (GPC) was investigated by changing the molarity of sodium hydroxide (NaOH) and the WGP percentage. The addition of WGP reduced the workability and setting time, while molarity significantly affected the setting time. A combination of 10% WGP and M13 NaOH was recommended for optimal sustainable GPC considering both fresh and hardening properties. Scanning electron microscopy (SEM) analysis was also performed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Marvellous Mareya et al.
Summary: The synergistic use of industrial and agricultural by-products can provide a solution to carbon emissions in the construction industry.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Mehmet Cemal Acar et al.
Summary: Using ground raw perlite through alkali activation can reduce Portland cement consumption and produce various construction materials with economic and environmental advantages. This study aimed to produce cementless pastes and mortars based on the alkali activation of raw perlite and standard sand, and investigate the properties and performance of aerated lightweight pastes and mortars using hydrogen peroxide as a blowing agent. The experimental findings revealed that adding 0.25% H2O2 (by mass of perlite) enabled the production of lightweight pastes and mortars with lower density and thermal conductivity without significant strength loss. The developed perlite-based aerated geopolymer provides an eco-friendly and energy-efficient solution for buildings.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yasin Onuralp Ozkilic et al.
Summary: This study investigated the effect of aluminum waste on reinforced concrete shear beams to prevent shear damage. There is a lack of research on the use of aluminum waste to produce expandable concrete and its usage in reinforced concrete structures. Experimental investigations were performed on different reinforced concrete beams with varying aluminum waste ratios and shear reinforcement spacing. The results showed that the load capacity of the aluminum waste combined beams increased as the stirrup reinforcement decreased, but decreased with increasing aluminum waste quantity in the concrete mixture. However, a decrease in load capacity of 1 vol.% aluminum waste was tolerable.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Review
Materials Science, Ceramics
Bodong Fang et al.
Summary: Magnesium phosphate cement (MPC) is a new cementing material that shows great potential and excellent properties. It not only possesses traditional cement characteristics but also exhibits features of ceramics, refractory materials, and biological materials. MPC materials have diverse applications in fields such as architecture, wall spraying, structure repair, solid waste curing, biomedical engineering, and 3D printing. This paper provides a summary of recent research progress on MPC, including material properties and applications in various fields, and discusses future research directions and current challenges.
CERAMICS INTERNATIONAL
(2023)
Article
Construction & Building Technology
Xiaohui Sun et al.
Summary: A geopolymeric flocculation-filtration-solidification method (G-FFS) was proposed to utilize waste slurry from shield tunneling construction. The properties and dewatering efficiency of the waste slurry conditioned by cementitious and geopolymeric agents were investigated. Results showed that the G-FFS method rapidly dewatered the slurry into high-strength building materials. The method also demonstrated better pump-ability and dewatering ability compared to traditional cementitious agent methods.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Yu Liu et al.
Summary: This study developed an advanced 3D base isolation technique and investigated the nonlinear seismic response of 3D base-isolated nuclear structures in complex layered sites using a global method. A novel 3D isolation system was designed based on the disc spring theory to flexibly adjust the structural stiffness and vertical bearing capacity. The applicability of 3D base isolation was verified and the dynamic behavior of a 3D base-isolated nuclear island building in complex-layered sites was analyzed.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Jingming Cai et al.
Summary: This paper investigates the mechanical behaviors of ECC-encased CFST columns after fire exposure with different parameters. The concrete-encased CFST column experiences severe concrete spalling, while the ECC-encased CFST column maintains its integrity under identical fire conditions. The ECC-encased CFST column shows higher eccentric load carrying capacity and flexural stiffness compared to the concrete-encased CFST column.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
S. Blesson et al.
Summary: Researchers conducted a comparative study on calcined and uncalcined agro-based waste ash in combination with granulated blast furnace slag (GGBS) in the alkali activation process. The study found that the use of calcined agro-based waste ash with GGBS yielded better results compared to uncalcined ash with GGBS.
COGENT ENGINEERING
(2023)
Article
Construction & Building Technology
Ming Jin et al.
Summary: This paper investigates the deterioration behavior of C-(A)-S-H samples with different Al/Si ratios under decalcification. The composition, structure, and morphology of the samples were studied using various techniques. The results show that Al(IV) in the alumino-silicate chain and most of the Al-incorporated phases dissolve in NH4Cl solution. Decalcification improves the polymerization and chain length of C-(A)-S-H and transforms it into amorphous Al-Si gel. The crystallinity of C-(A)-S-H is damaged, the nanomorphology changes from foil-like to flocculent, and the pore structure is refined by the generation of amorphous Al-Si gel. Samples with moderate Al/Si ratio exhibit better resistance to structural evolutions. This work provides insights into the deteriorating mechanism of blended cement-based/alkali-activated materials and the improvement of structural stability through moderate Al addition.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Engineering, Geological
Zhipeng Wu et al.
Summary: A uniaxial strain-softening constitutive model for fiber-reinforced soils is developed based on the disturbed state concept. The model considers the response in the intact state and fully adjusted state, and the apparent stress-strain curve is derived from a weighted average of these two responses. The model demonstrates that fiber content has a greater influence on reinforcement effect than fiber length. Evaluation of test data shows that the model predicts stress-strain curves in good agreement with experimental results, and accurately describes the fiber reinforcement effect.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
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Green & Sustainable Science & Technology
Nagarajan Arunachelam et al.
Summary: This study investigates the mechanical and chemical characteristics as well as the durability of high-strength geopolymer concrete developed using high-volume copper slag and micro silica. The results show that the addition of 2% micro silica can significantly enhance the compressive strength of the HSGPC.
Article
Chemistry, Physical
Ozer Zeybek et al.
Summary: This study examines the effect of waste glass on the mechanical properties of concrete. The results show that a moderate substitution of waste glass for cement can enhance the strength of concrete, while excessive substitution leads to poor workability. Furthermore, good adhesion is observed between waste glass and cementitious concrete. Empirical equations are proposed to estimate the strength values of concrete with different amounts of waste glass.
Article
Green & Sustainable Science & Technology
Ceyhun Aksoylu et al.
Summary: Along with the increase in global vehicle sales, waste tires are becoming an increasingly serious problem. Reusing these waste materials instead of disposing them is crucial for preventing environmental pollution and creating new low-cost products. This study investigates the effect of recycled steel wires from waste tires on the properties of traditional reinforced-concrete beams. The results show that increasing fiber content effectively enhances the compressive and tensile strength of concrete.
Article
Green & Sustainable Science & Technology
Amir Ali Shahmansouri et al.
Summary: This research focuses on enhancing the compressive strength of Geopolymer Concrete by partially substituting materials and controlling the solution concentrations, and establishes a predictive model based on Artificial Neural Network (ANN).
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Civil
Hua Huang et al.
Summary: A novel bending-shear decoupled prefabricated beam-column joint with a replaceable Artificial Controllable Plastic Hinge (ACPH) was proposed to promote and effectively control precast structures' seismic performance. The ACPH significantly affects the failure mode, offering excellent hysteresis behavior, sufficient ductility, and superior energy consumption capacity. Even if half of the energy-consuming system fails, the ACPH still maintains remarkable seismic performance.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Siqi Zhou et al.
Summary: A new type of lunar soil simulant named BH-1 was developed in this study, which closely resembles real lunar soil and was used to synthesize a geopolymer under simulated lunar atmospheric conditions. Supplementing aluminum sources in the geopolymer based on BH-1 significantly improved its strength, showing promising results for potential lunar base construction.
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Construction & Building Technology
Hua Huang et al.
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