Article
Construction & Building Technology
Suhawn Ju, Sungjun Bae, Jueun Jung, Sungwoo Park, Sukhoon Pyo
Summary: This research proposes the use of coal bottom ash (CBA) in metakaolin-based geopolymers. By treating CBA with an alkaline solution and mixing it with metakaolin, the proposed method minimizes the degrading effect of CBA on the compressive strength of geopolymers. The study shows that this method can accommodate a larger amount of CBA and achieve higher compressive strength compared to the conventional mixing method.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Yaping Ge, Xiang Tian, Dunwen Huang, Qingyu Zhong, Yiwei Yang, Hui Peng
Summary: Efflorescence behavior and compressive strength evolution were analyzed for metakaolin (MK)-based geopolymers cured at different temperatures and times. The influence of pore structure on efflorescence behavior and compressive strength evolution was identified based on pore structure characterization using MIP. The results showed that long-term and initial high-temperature curing had negative effects on efflorescence mitigation, with long-term curing facilitating alkali salt migration to the surface and initial high-temperature curing enhancing alkali salt movement by increasing pore connectivity. The number of pores below 20 nm governed the effect of efflorescence on compressive strength, with crystallization degrading geopolymer with a large number of pores below 20 nm. This study provides important insights into the effect of pore structure on efflorescence and compressive strength evolution, and facilitates the optimization of geopolymer formulations to alleviate efflorescence.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Abdulrahman Albidah, Mohammed Alghannam, Husain Abbas, Tarek Almusallam, Yousef Al-Salloum
Summary: This study investigates the effects of mix design parameters on properties of geopolymer concrete produced using local metakaolin, presenting useful models for predicting performance and confirming results through XRD, SEM, and EDS analysis on selected mixes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Civil
Veysel Akyuncu, Yunus Emre Avsar, Tolga Enes Emre
Summary: The study analyzed the influence of activator type on the physical and mechanical properties of geopolymer mortars. Different ratios of C and F-class fly ash, blast furnace slag, sodium hydroxide, and sodium metasilicate were used. Tests and analysis showed that the addition of sodium metasilicate increased the compressive strength and inhibited crack formation. A higher ratio of C-class fly ash led to more cracks, while a higher K content and SiO2 ratio improved the alkalinity and strength.
PERIODICA POLYTECHNICA-CIVIL ENGINEERING
(2023)
Article
Polymer Science
Natalia Wielgus, Jan Kubica, Marcin Gorski
Summary: The paper explores a novel approach to using FBC fly ash as the main raw material for geopolymer, resulting in a promising environmentally friendly material with good mechanical properties for construction applications. The study found that specific compositions and demolding times significantly impact the basic mechanical properties of the geopolymer, with a mixture of FBC fly ash to metakaolin in a mass ratio of 3:1 and a demolding time of 14 days showing the best results for construction materials.
Article
Construction & Building Technology
Lei Wang, Qiancheng Zhang, Jin Yi, Jiwang Zhang
Summary: This paper focuses on the ultrasonic pulse velocity (UPV) characteristics of coral concrete, especially with respect to porosity and compressive strength. The study found that the diverse morphology and complex internal structure of the coral aggregate greatly affect the homogeneity of its UPV. The study also discovered a strong correlation between the porosity, compressive strength, and UPV of the coral concrete, allowing for the inference of strength through the UPV method.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
H. M. Khater, Mahmoud Gharieb
Summary: This study reviewed the effect of nano-silica fume on the thermal stability and mechanical behaviors of geopolymers at high temperatures. The results showed that nano-silica fume had a positive effect on the physico-mechanical properties of MK-geopolymer, with an inclusion of 5% nano-silica fume enhancing the strength and microstructure.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yiping Luo, Bowen Li, Defa Wang, Yurong Lv, Zhonghua Jiang, Guobin Xue
Summary: Geopolymers, as a new type of green inorganic material, have excellent mechanical properties and durability, but also have some disadvantages. This study investigated the uniaxial compressive strength of geopolymer mortar and analyzed the effects of alkali equivalent, alkali activator modulus, bone glue ratio, and silica fume content on the mechanical properties. Additionally, the study examined the impact of defoamers on the compressive strength, fluidity, density, and water-absorption of geopolymer mortar, confirming that defoamers can be effective additives for geopolymer mortar.
Article
Chemistry, Physical
Adelino Lopes, Sergio Lopes, Isabel Pinto
Summary: This study focuses on the development of a new family of geopolymers obtained by alkaline activation and aims to find a viable alternative to concrete. The research shows that curing temperatures below 30 degrees Celsius should be used to maintain the strength of metakaolin-based geopolymers.
Article
Chemistry, Physical
Salim Barbhuiya, Edmund Pang
Summary: This study examines the strength and microstructure of geopolymer based on fly ash and a combination of metakaolin and fly ash, exploring ways to limit or eliminate the usage of Portland cement in concrete.
Article
Green & Sustainable Science & Technology
Linfeng Zhang, Yingfan Wang, Boyin Ding, Jiaming Gu, Neven Ukrainczyk, Jingming Cai
Summary: This study aims to develop geopolymer-based composites for geothermal energy applications. The addition of silicon carbide (SiC) powder was found to improve the compressive and flexural strength of geopolymer composites, while the influence of SiC particles was insignificant. The combined application of SiC powder and SiC particle increased the thermal conductivity of geopolymer composites, making it a suitable material for geothermal energy applications. The addition of silicon carbide was also concluded to improve the heat exchange rate and heat utilization efficiency of energy piles.
JOURNAL OF CLEANER PRODUCTION
(2023)
Review
Green & Sustainable Science & Technology
A. A. Raheem, R. Abdulwahab, M. A. Kareem
Summary: The construction industry is seeking innovative, cost efficient, and eco-friendly materials to replace conventional concrete, including natural materials, industrial byproducts, and agricultural wastes. Research is needed to understand the impact of different sources of materials on properties, and how to enhance early strength development in concrete.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Materials Science, Multidisciplinary
Ong Shee-Ween, Heah Cheng-Yong, Liew Yun-Ming, Mohd Mustafa Al Bakri Abdullah, Ho Li Ngee, Lynette Wei Ling Chan, Ooi Wan-En, Nur Ain Jaya, Ng Yong-Sing
Summary: This research focuses on utilizing low alkali activator content and cold pressing technique to form fly ash-based geopolymers under room temperature conditions. The results demonstrate that specific parameters can lead to optimized mechanical properties in the geopolymers.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Construction & Building Technology
Herda Yati Binti Katman, Wong Jee Khai, Naraindas Bheel, Mehmet Serkan Kirgiz, Aneel Kumar, Omrane Benjeddou
Summary: The incorporation of coir fiber in concrete can enhance its strength and durability. In this study, the effects of different coir fiber content on the workability, strength, and permeability of the concrete were evaluated. The results showed that 2% coir fiber modification offered the best improvement in compressive strength, splitting tensile strength, and flexural strength.
Article
Construction & Building Technology
Selmi Abdellatif, Khaled Mohamed Elhadi, Ali Raza, Muhammad Arshad, Ahmed Babeker Elhag
Summary: Concrete production and use contribute to environmental issues, and researchers are exploring innovative geopolymer concrete technology to tackle these challenges. Cracks in concrete structures can lead to reduced service life and structural failure, but self-healing geopolymer concrete offers a solution. This study evaluates the mechanical characteristics and self-healing abilities of SHG concrete in the construction industry.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Materials Science, Textiles
Tido Tiwa Stanislas, Josepha Foba Tendo, Emeso Beckley Ojo, Odette Fayen Ngasoh, Peter Azikiwe Onwualu, Ebenezer Njeugna, Holmer Savastano Junior
Summary: The aim of this study was to investigate the feasibility of producing cellulose pulp and nanofibrillated cellulose from prevalent plants in West and Central Africa, and to evaluate their suitability as reinforcing elements for composites. The results showed that raffia fibers and cassava bagasse have potential as suitable sources for micro/nanocellulose.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Textiles
Patricia Das Neves, Matheus Roberto Cabral, Valdemir Santos, Marcio Roberto Pinto Mafra, Holmer Savastano Junnior
Summary: This study aimed to evaluate the mechanical, physical, and morphological properties of bundle fibers extracted from curaua leaves in a cementitious matrix through mechanical testing and pullout testing. Results showed that curaua fibers have higher rupture resistance and Young's modulus, but exhibit low adhesion with the cementitious matrix.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Textiles
Samuel Charca, Carlos Tenazoa, Holmer Savastano Junior
Summary: This study demonstrates a clear relationship between true density and the three major constituents (cellulose, lignin, and extractives) in Stipa obtusa base fibers, with a fitting parameter R > 90%. The use of true density as an alternative method to determine chemical composition proves to be effective and efficient for predicting product quality.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Multidisciplinary Sciences
Assia Aboubakar Mahamat, Abubakar Dayyabu, Abdulganiyu Sanusi, Mohammed Ado, Ifeyinwa Ijeoma Obianyo, Tido Tiwa Stanislas, Numfor Linda Bih
Summary: Dimensional stability and compressive strength are key factors to consider when modeling earth-based materials. This study aims to use locally available waste materials for sustainable construction by employing soil stabilization techniques. Cement was used as a stabilizer in combination with Borassus fruit ash to stabilize termite mound soil. The mix design was analyzed using scanning electron microscopy and Fourier transform infrared to understand the impact of each stabilizer on microstructure and bonding mechanism. Water sensitivity, linear shrinkage, and compressive strength were also tested. Results showed that the hybrid borassus fruit ash/cement at 10wt% exhibited satisfactory compressive strength and offers potential for reducing agricultural waste and modeling sustainable housing materials.
Article
Materials Science, Multidisciplinary
Jeanne Pauline Munganyinka, Jean Baptiste Habinshuti, Gbetoglo Charles Komadja, Placide Uwamungu, Himanshu Tanvar, Grace Ofori-Sarpong, Brajendra Mishra, Azikiwe P. Onwualu, Scott Shuey
Summary: This study investigated the leaching behavior of gold from sulfide gold ore concentrates using acidified thiourea solution. The results showed that thiourea leaching could be a potential alternative to cyanide process for gold recovery.
Article
Construction & Building Technology
Assia Aboubakar Mahamat, Nordine Leklou, Ifeyinwa Ijeoma Obianyo, Philippe Poullain, Tido Tiwa Stanislas, Olugbenga Ayeni, Numfor Linda Bih, Holmer Savastano Jr
Summary: This investigation presents a multiscale examination of the hygro-thermal and mechanical properties of a designed earth-based bio-composite. The inclusion of natural Borassus fruit fiber in the composite improves its mechanical and thermal performance, making it a promising material for various applications.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Polymer Science
Syrille Brice Tchinwoussi Youbi, Omar Harzallah, Nicodeme Rodrigue Sikame Tagne, Paul William Mejouyo Huisken, Tido Tiwa Stanislas, Jean-Yves Drean, Sophie Bistac, Ebenezer Njeugna
Summary: This study investigates the effects of length and reinforcement ratio of Raphia vinifera fibres (RVFs) on the physical and mechanical properties of an epoxy matrix composite. Various volume fractions and lengths of fibres were used to produce the composite, and the samples were tested for density, porosity, water absorption rate, tensile and flexural strength. The study found that the addition of RVF decreased the density of the composite and increased porosity and absorption rate, while also lowering mechanical properties such as tensile and flexural stress and Young's modulus. Fibre lengths and reinforcement ratio significantly affected the mechanical properties of the composite. The distribution of strength and Young's modulus followed Weibull's law. The Cox-Krenkel mathematical model was found to be the best approximation for the experimental results. These findings suggest that RVFs could be used as reinforcement parts in various applications.
INTERNATIONAL JOURNAL OF POLYMER SCIENCE
(2023)
Article
Geochemistry & Geophysics
Benneth Ifenna Okoli, Olufemi A. Agboola, Azikiwe Peter Onwualu, Abdulhakeem Bello, Olusegun Samuel Sholiyi, Vitalis C. Anye, Olatunbosun T. Yusuf
Summary: This paper discusses the potential industrial use of zircon from different states in Nigeria. The samples were examined using various techniques and equipment, revealing the presence of quartz, zirconium oxide, and other minerals. Some of the samples required upgrading to improve their suitability for various industries. The findings of this study can be valuable for industries in developing industrial materials and processing methods for zircon beneficiation.
Article
Materials Science, Composites
Tido Tiwa Stanislas, Assia Aboubakar Mahamat, Ketty Bilba, Cristel Onesippe-Potiron, Marie-Ange Arsene, Holmer Savastano Jr
Summary: The inclusion of cellulose pulp (CP) and cellulose nanofibrils (CNF) from recycled cardboard in earth-based materials has been evaluated for its effects on water absorption, density, dimensional stability, thermal insulation, flexural strength, and durability. The partial replacement of CP with CNF increases the moisture content, reduces dry shrinkage and thermal conductivity, and improves the flexural strength and modulus of elasticity of the hybrid materials.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Chemistry, Physical
Michelle S. Rodrigues, Jordi Paya, Lourdes Soriano, Jose Monzo, Maria Victoria Borrachero, Holmer Savastano, Antonio L. Beraldo
Summary: This study aims to evaluate the reactivity of sugarcane straw ashes (SCSA) burned under controlled conditions and analyze their application in blended cement and hydrated lime pastes. The results show that sugarcane straw ashes burned at specific temperatures can partially replace inorganic binders and have a positive impact on hydrated lime and cement pastes.
Article
Construction & Building Technology
Numfor Linda Bih, Assia Aboubakar Mahamat, Chukwuemeka Chinweze, Olugbenga Ayeni, Hounkpe Jechonias Bidossessi, Peter Azikiwe Onwualu, Emmanuel E. Boakye
Summary: Bone ash waste can be utilized to produce clay ceramic bricks, and the addition of bone ash improves the compressive strength and water absorption properties of the bricks.