Related references
Note: Only part of the references are listed.
Review
Engineering, Civil
Hemn Unis Ahmed et al.
Summary: Geopolymer concrete, which is an environmentally friendly building material, has its compressive strength influenced by factors such as curing temperature and the ratio of alkaline solution to binder. Multiple models have been developed to predict the compressive strength, with the ANN model performing the best.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(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
L. F. Fan et al.
Summary: In this study, a rapid approach for determining the mechanical properties of geopolymer concrete (GPC) based on image processing technology (IPT) was proposed. The results showed that the approach can accurately predict the mechanical properties of GPC with an error of less than 10.0%, and the predicted optimum aggregate content was consistent with the experimental results. The proposed approach has potential application prospects in rapid repair engineering.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Review
Construction & Building Technology
Liming Li et al.
Summary: Alkali-activated materials (AAMs) are potential substitutes for ordinary Portland cement due to their better properties and lower carbon footprint. This review focuses on the setting behaviours of two types of AAMs prepared from ground granulated blast furnace slag (GGBFS) and metakaolin (MK). The study discusses the effects of chemical compositions of precursors, activators, and retarders on the setting times, strengths, and workabilities of AAMs, and provides advice for better application.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Fatheali A. Shilar et al.
Summary: This paper explores an unexplored area in geopolymer and develops high-performance concrete. The optimal percentages of slag and activators, such as potassium and calcium hydroxide ratio, in metakaolin-based geopolymer are investigated. Different proportions of geopolymer concrete are cast using alkaline to binder ratios of 0.25, 0.35, and 0.45 and tested at 7, 28, and 90 days. The fresh, mechanical properties, probability, matrix, and smoothening plot for modulus of elasticity of geopolymer are investigated. The Ishikawa diagram discusses cause-and-effect factors of geopolymer concrete. Geopolymer exhibits medium workability and mechanical properties, and shows excellent results compared to traditional concrete at 30% slag usage and a 0.35 ratio of A/B. The optimum mix for geopolymer concrete with 30% GGBS achieves maximum strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Polymer Science
Hemn Unis Ahmed et al.
Summary: The rapid growth of urban areas and industries has led to increased concrete production, depletion of resources, and environmental pollution. To address this issue, alternative binding construction materials that can replace conventional Portland cement are needed. Geopolymers, utilizing nanomaterials, have emerged as a viable solution. This study investigates the effects of adding different dosages of nano-silica particles on the performance of geopolymer concrete composites. The addition of nano-silica improves the mechanical strength, electrical conductivity, and thermal behavior of geopolymer concrete.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Zhaowen Du et al.
Summary: The potential application of CaO/CaSO4 composite activator in red mud-based geopolymer was investigated. The combination of CaO and CaSO4 significantly increased the strength of red mud-based geopolymer and reduced the filling cost, promoting the simultaneous utilization of red mud, fly ash, and gangue to protect the environment.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Construction & Building Technology
Balamurali Kanagaraj et al.
Summary: The present investigation aims to study the mechanical and durability performances of Fly Ash (FA), Ground Granulated Blast Furnace Slag (GGBS), and Metakaolin (MK) blended Self-compacting Geopolymer concrete (SCGC). The significance of the investigation is to study the application of SCGC composites over conventional cement concrete for infrastructure. The experimental results show that the FA-SCGC, FG-SCGC, and FM-SCGC mixes have better performance against acid and salt solutions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Jinrui Zhang et al.
Summary: This paper systematically researched the mechanisms of molybdenum tailings on fly ash-based geopolymers. The addition of molybdenum tailings improved the fluidity, delayed the setting time, increased the drying shrinkage, and significantly enhanced the bending strength of fly ash-based geopolymers. The results demonstrated that glassy sodium calcium aluminum silicate hydrate (N(C)-A-S-H) gel was the main product, and the addition of molybdenum tailings did not induce the formation of new crystal phases in fly ash-based geopolymers. Moreover, the pore structure of fly ash-based polymers was significantly improved by the addition of molybdenum tailings, leading to reduced cracks and defects and improved microstructure compactness.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Bouha El Moustapha et al.
Summary: This study successfully overcame the negative effects of microencapsulated phase change materials on the mechanical strength and thermal conductivity of blast furnace slag-based geopolymer mortars by incorporating NASH and CASH gels. With the optimization of NASH and CASH gel coexistence, improvements were seen in the mechanical properties and thermal performance of the geopolymer mortars. This was achieved through the high reactivity of metakaolin and the formation of NASH and CASH gels which compensated for the negative effects of the phase change materials on the geopolymer matrix.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Nadhim Hamah Sor et al.
Summary: This study investigated the relationship between lightweight self compacting concrete made with waste expanded polystyrene beads and their mechanical characteristics, finding that increasing EPS content improved workability but decreased strength, while still meeting the minimum requirements for structural applications. The actual strengths were found to be closest to the ACI 363 standard in comparison to empirical models presented in codes and literature studies.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Chemical
Yanfeng Nie et al.
Summary: This study investigates the use of metakaolin as a modifier for high-volume fly ash (HVFA) concrete. It is found that incorporating an appropriate amount of metakaolin improves the mechanical properties and microstructure of HVFA concrete, reducing drying shrinkage and porosity. Furthermore, the inclusion of metakaolin helps reduce the carbon footprint and cost of HVFA concrete.
Article
Construction & Building Technology
Faten Souayfan et al.
Summary: Blending metakaolin with slag in alkali-activated materials can achieve both acceptable engineering properties and durability. NMR spectroscopy is used to investigate the structure of alkali-activation products, but there is no consensus on the analysis of NMR spectra for identifying the phases formed in binary slag-metakaolin mixtures. This study characterizes the phase composition and reaction degree of alkali-activated metakaolin-slag blends, and shows that the incorporation of slag results in higher reactivity and compressive strength of metakaolin.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Weichao Guo et al.
Summary: This study improved the resource utilization of solid wastes such as soda residue, carbide slag, and iron tailings by combining them with iron tailings aggregate to prepare high-quality solid waste-based concrete. The concrete exhibited excellent mechanical properties, including compressive, tensile, and flexural strengths.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Review
Construction & Building Technology
Shikun Chen et al.
Summary: This paper reviews the studies on the pore structure of geopolymers, focusing on its relationship with material performance and influencing factors. It provides general rules for optimizing the pore structure and performance of geopolymers, aiding in their rational design and application.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Multidisciplinary Sciences
Hemn U. Ahmed et al.
Summary: This study developed predictive models for the compressive strength of blended ground granulated blast furnace slag and fly ash based-geopolymer concrete (GGBS/FA-GPC) using various models such as Artificial Neural Network (ANN), M5P-Tree (M5P), Linear Regression (LR), and Multi-logistic regression (MLR). The results showed that the ANN model performed the best in predicting the compressive strength. Additionally, the alkaline liquid to binder ratio, fly ash content, molarity, and sodium silicate content were identified as the most influential parameters on the compressive strength of GGBS/FA-GPC.
Article
Engineering, Environmental
Jiang Du et al.
Summary: This paper presents the feasibility and benefits of using off-specification fly ash (OSFA) in preparing ultra-high-performance concrete (UHPC). The experimental results showed that UHPC with the proper combination of OSFA and slag achieved the desired compressive and flexural strengths and had low autogenous shrinkage and leachability of heavy metals. Various methods were used to investigate the underlying mechanisms of property development. Economic and environmental analysis demonstrated that using OSFA significantly reduced the life-cycle cost, carbon footprint, and energy consumption of UHPC. This study provides a new avenue for the valorization of OSFA and the development of cost-effective and eco-friendly UHPC.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Construction & Building Technology
Yanlong Li et al.
Summary: This study investigates the damage evolution of concrete with different degrees of freeze-thaw (F-T) damage through F-T cycle and compression tests. The results show that the degree of F-T damage increases with the number of F-T cycles. During compression failure, the amplitude of acoustic emission (AE) exhibits a more significant and rapid increase, indicating a more brittle behavior of concrete after F-T damage. The damage constitutive model established in this study accurately reflects the damage evolution of concrete during the entire process of uniaxial compression after F-T cycles.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Zhongnan Tian et al.
Summary: This study used molecular dynamics simulation to investigate the interfacial characteristics and mechanical behaviors of geopolymers with steel slag aggregates. The results showed that the steel slag mineral surfaces exhibited strong hydrophilicity and promoted the diffusion of ions at the interface. The interaction at the interface was mainly due to electrostatic interactions and hydrogen bonding. The formation of composite ionic clusters stabilized the interfacial interaction. The C-A-S-H geopolymer binder demonstrated stronger interfacial tensile strength and shear strength. The composition of steel slag aggregates affected the interfacial bonding and occurrence of damage.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Computer Science, Artificial Intelligence
Hemn Unis Ahmed et al.
Summary: This study developed various models to predict the compressive strength of blended GGBFS/FA-based AAC. The results showed that the artificial neural network (ANN) model outperformed the other models in predicting the compressive strength. Sensitivity analysis revealed that the alkaline liquid-to-binder ratio, NaOH content, and age of concrete specimens significantly influenced the compressive strength of AAC.
NEURAL COMPUTING & APPLICATIONS
(2022)
Article
Construction & Building Technology
Usman Javed et al.
Summary: This research investigates the dilution of sulfate ions in lithium slag geopolymer by incorporating silica fume and fly ash as chemical modifiers. The results show that the incorporation of silica fume and fly ash increases the compressive strength of the lithium slag geopolymer by suppressing the formation of sulfate ions and densifying the gel structure. The main binding zeolite phases identified in the geopolymer were mordenite, anorthite, analcime, and calcium chabazite for fly ash replaced geopolymer, and mordenite, anorthite, analcime, and sodium clinoptilolite for silica fume incorporated geopolymer. The study suggests that lithium slag can be a promising precursor for geopolymer production, but further research is needed to assess its chemical viability as a sole binder.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Elif Disci et al.
Summary: This study investigates the effects of using nano-Al2O3 and nano-CaO in perlite-based geopolymer concrete on its properties. The addition of nanomaterials improves compressive strength and prevents crack and pore formation, with nano-Al2O3 showing the most significant impact. The study also confirms the applicability of the one-part mixture method in producing perlite-based geopolymer concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yiping Luo et al.
Summary: This study investigated the effects of NaOH on pore structure and mechanical properties of UMK geopolymers under room temperature curing conditions. The results showed that with increasing NaOH concentration, the porosity of UMK geopolymer decreased and large pores evolved into mesopores.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Elif Disci et al.
Summary: The study aimed to improve the mechanical properties of perlite-based Geopolymer concrete by adding nanomaterials, with nano-Al2O3 found to significantly affect compressive strength and the optimal curing condition being heat + ambient curing.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Xingyi Zhu et al.
Summary: This paper presents an experimental study on recycling steel slag waste as a supplementary material in metakaolin based geopolymer to create a new type of composite material. By analyzing the strength and microstructure of two different composites, it was found that the incorporation of steel slag into the geopolymer resulted in lower strength compared to the geopolymer without steel slag at early ages, but the negative effect decreased with curing age.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Marine
Nan Zhao et al.
Summary: The durability performance of polyvinyl alcohol fiber reinforced geopolymer composites is affected by the addition of fly ash and bentonite in a marine environment, with the best performance observed when the ratio of fly ash to cement is 1.8 in water. Acoustic emission characteristics closely correlate with damage development and stress-strain curve, showing distinct stages of initial, stable expansion, and unstable expansion. Increasing the fly ash and bentonite addition reduces the intensity and density of acoustic emission signals, leading to more uniform signal distribution.
Article
Construction & Building Technology
Bai Zhang et al.
Summary: This study investigated the use of eco-friendly slag-based alkali-activated materials to improve the weak characteristics of coral aggregates in concrete. Results showed that alkali-activated seawater coral aggregate concrete exhibited better performance than cement-based coral aggregate concrete and a model was established to explain the relationship between stress-strain curves, elastic modulus, and concrete compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Chemistry, Physical
Azad A. Mohammed et al.
Summary: Through data analysis, it was found that some past equations can be applied to predict different mechanical properties of geopolymer concrete, but also identified cases where certain equations overestimated test data.
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