KHORAMI, MAJID

Preferred name
KHORAMI, MAJID
Main Affiliation
TCEMC - Grupo de Investigación Tecnología de la Construcción, Estructuras y Materiales de Construcción
Web Site
ORCID
0000-0003-4592-0233
Scopus Author ID
57195411779

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    Analysis of the Influence of Sugarcane Bagasse Fibers in the Natural State on the Mechanical Properties of Concrete
    (Informa UK Limited, 2025-03-25)
    Paúl Molina Román
    ;
    Christopher Capelo
    ;
    Mariela Anaguano-Marcillo
    ;
    Carlos Solórzano
    ;
    Jorge Albuja-Sánchez
    This study aims to analyze the influence of sugarcane bagasse fiber (SCBF) without treatment on concrete and its impact on carbon footprint production. This review studies the impact of SCBF on the compressive strength, flexural strength, direct tensile strength, and elasticity modulus, considering fiber percentages of 1%, 3%, 5%, and 6%. The results showed that SCBF had a negative influence on concrete because as the percentage of fiber increased, it started to become invasive in the concrete mix and proportionally influenced the strength reduction, obtaining a maximum decrease of 60.96% in the compressive strength. However, the CO2 emissions decreased as the fiber percentage increased, generating maximum emission savings of 17.19%.
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    Investigating the optimal replacement percentage of various types of coal waste with chemical additives in concrete construction for sustainable energy applications
    (Elsevier BV, 2025-09)
    Mahdi Shariati
    ;
    Mehdi Tazikeh
    ;
    Morteza Naghipour
    ;
    Bagher Hoseinian
    ;
    Hesam Kamyab
    The large coal production and consumption has caused environmental problems worldwide as a source of energy production with irreparable effects on soil, water, and the ecosystem. In addition, producing coal waste in coal washing plants and burying it intensifies the issue in nature. Due to the rising generation of coal waste from various sources, this study utilized several forms of coal waste obtained from a coal-washing plant in the production of both structural concrete (with a water-cement ratio of 0.54) and non-structural concrete (with a water-cement ratio of 0.7). The impact of coal waste on compressive strength (CS) was examined at curing ages of 7, 28, and 56 days. Various percentages of coal waste were substituted for both cement and sand. A superplasticizer was incorporated into the concrete mixtures to enhance the workability and achieve the desired slump and strength levels. According to the compressive strength findings, the ideal replacement level of sand with jig coal waste was 30 %. For 56-day-old specimens, the optimal substitution rates for cement with jig coal waste powder, flotation coal waste, and coal waste ash were found to be 10 %, 10 %, and 20 %, respectively. Notably, adding 10 % coal waste powder and coal waste ash increased compressive strength by 22 %, 23 %, and 44 % at 56 days.
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    Impact of carbon on global and regional economies: analyzing economic growth, employment, and trade balances through artificial neural networks
    (Springer Science and Business Media LLC, 2025-03-08)
    Siqi Liu
    ;
    Yousef Zandi
    ;
    Alireza Sadighi Agdas
    ;
    Mohamed Amine Bouraoui
    ;
    Anas A. Salameh
    The study presents a framework for the sustainable carbon-based nanomaterials, focusing on Carbon Nano Tubes (CNTs). The framework integrates performance, hazard, and economic considerations toward the development of CNT-enabled products. Through Life Cycle Analysis (LCA) and environmental degradation studies, the research highlights the energy-intensive nature of CNT production, the persistence of CNTs in the environment, and the associated ecotoxicity risks. Functionalization of CNTs is emphasized as a crucial strategy to enhance biodegradability and reduce toxicity. The study also addresses the economic trade-offs, noting that while CNTs offer superior functional performance, their high production costs and energy demands must be carefully managed. The proposed framework aims to ensure that CNTs maximize their benefits while minimizing their environmental and health impacts, thereby supporting the sustainable advancement of carbon nanomaterials in various applications. The study found that CNT production is highly energy-intensive, but scaling up can improve efficiency. CNTs persist in the environment, with partial degradation, indicating potential long-term ecological risks. Functionalization enhances biodegradability and reduces toxicity, helping to balance performance with sustainability.
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    Behavior of steel storage pallet racking connection - A review
    (2019)
    Chulin Chen
    ;
    Lei Shi
    ;
    Mahdi Shariati
    ;
    Ali Toghroli
    ;
    Edy Tonnizam Mohamad
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    Intelligent design of retaining wall structures under dynamic conditions
    (2019)
    Haiqing Yang
    ;
    Mohammadreza Koopialipoo
    ;
    Danial Jahed Armaghani
    ;
    Behrouz Gordan
    ;
    KHORAMI, MAJID  
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    Modified couple stress and artificial intelligence examination of nonlinear buckling in porous variable thickness cylinder micro sport structures
    (Informa UK Limited, 2024-02-29)
    Lizhe Qi
    ;
    Ziheng Wang
    ;
    Yunquan Sun
    ;
    KHORAMI, MAJID  
    ;
    Tayebeh Mahmoudi
    This investigation focuses on the nonlinear behavior of porosity-dependent functionally graded (FG) truncated conical small-scale structures. The modified coupled stress theory, as well as the energy method, are applied to generate the nonlinear partial differential equations (PDEs) related to buckling analysis of simply supported nonuniform micro-cylindrical structures. The material dispersion is gradually changed along the length of the structures between the Nickel and concrete, while the porosity voids are scattered in the radial direction, and the external radius of the structure decreases along the length direction via nonlinear mathematic equations applicable in sports structures. The PDEs are numerically solved via the generalized differential quadrature method (GDQM) coupled with the numerical iterative technique. In this particular context, the aim is to predict nonlinear results using a newly developed methodology that employs artificial neural networks (ANNs). The predictions generated by this approach will be compared against previously obtained data and validated to ensure their accuracy and reliability. The ANN methodology is expected to provide a more robust and comprehensive framework for predicting nonlinear results, which would be helpful in a variety of settings, from scientific research to engineering applications.
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    Experimental methodology on the serviceability behaviour of reinforced ultra‐high performance fibre reinforced concrete tensile elements
    (Wiley, 2020-06-03)
    KHORAMI, MAJID  
    ;
    Juan Navarro‐Gregori
    ;
    Pedro Serna
    Abstract Design codes include serviceability limit state (SLS) provisions for stress, crack, and deflection control in concrete structures, which may limit the structural design. When drawing on reinforced ultra‐high performance fibre‐reinforced concrete (R‐UHPFRC), the process of cracking differs significantly from traditional concretes. Thus, it remains unclear whether the traditional provisions are applicable to R‐UHPFRC or should be reviewed. Uniaxial tensile tie test is an excellent option to analyse and review these criteria. This work proposes a novel test methodology to study the behaviour of R‐UHPFRC under serviceability conditions, which lets the study of the global and local deformation behaviour by using different measurement equipment. Two different types of R‐UHPFRC ties with variant fibre content were tested. The global average tensile stress–strain curve, cracking behaviour, number, and width of cracks were obtained. Promising preliminary results admitted that this methodology can be useful to propose design criteria of R‐UHPFRC under SLS.
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    Nano-silica in Holcim general use cement mortars: A comparative study with traditional and prefabricated mortars
    (2024)
    Mohammadfarid Alvansazyazdi
    ;
    Jorge Figueroa
    ;
    Alex Paucar
    ;
    Gilson Robles
    ;
    KHORAMI, MAJID  
    Nano-silica’s growing use in construction, known for enhancing strength and durability by reducing porosity, drives this research’s significance, especially considering Ecuador’s reliance on cement in construction. A comprehensive comparative study on mortars made with General Use cement and aggregates from Pifo and San Antonio quarries has been studied. It explores the impact of incorporating nano-silica in varying proportions (0.75%, 1.00%, 1.25%) on mortar properties, contrasting them with conventional and prefabricated mortars. laboratory Testing is conducted according to standards to assess both fresh and hardened state properties, and microscopic analysis reveals the optimal nano-silica proportion’s effects on mortar characteristics. Results shows that Incorporating 0.75% nano-silica resulted in a 61% increase in compressive strength at 7 days and. For a nanosilica content of 1.25%, a 14% increase in compressive strength was observed at 28 days in relation to the conventional mortar and the permeability of the mortar decreased by 30% when adding 0.75% nanosilica. It discusses economic viability and provides insights through SEM and EDS analyses. Overall, it underscores nano-silica’s potential to enhance mortar properties and its relevance in creating more efficient and durable construction materials.