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Blessing Adeleke
School of Engineering, Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 1DL, UK

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Journal article
Published: 20 August 2021 in Sustainability
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The current study investigated the development of a sustainable thermo-chemical approach to effectively optimize MgO-waste activated GGBS formulations, using four types of magnesium oxide (MgO) waste materials with ground granulated blast-furnace slag (GGBS) to develop binary cementitious systems (MgO-GGBS). This stems from the expected complexity of cementitious binder optimization outcomes into a simpler analytic form, enhancing the rapid delivery of optimization results and contributing to the global awareness of sustainable approaches and use of industrial wastes. Three levels of Portland cement by weight (90, 80, and 70 wt.%) was replaced with MgO wastes including an industrial by-product (GGBS) to develop an experimental regime. Investigation was carried out by employing an experiment-based optimisation technique (thermo-chemical approach), which involved the design of an experimental regime and application of experimental tests (pH measurements, thermogravimetric and derivative thermogravimetric analysis—TG/DTG and isothermal calorimetry), establishment of design variable/parameters, measurement of the design performance of the identified design parameters, and review of the relationship between the independent (control) and dependent variables (MgO wastes and their compositions). The experimental test results successfully optimised the binder compositions, established the best performing binder system (MG1), and provided an in-depth insight into the thermal stability and hydration kinetics of the investigated binder systems.

ACS Style

Blessing Adeleke; John Kinuthia; Jonathan Oti. Optimization of MgO-GGBS Cementitious Systems Using Thermo-Chemical Approaches. Sustainability 2021, 13, 9378 .

AMA Style

Blessing Adeleke, John Kinuthia, Jonathan Oti. Optimization of MgO-GGBS Cementitious Systems Using Thermo-Chemical Approaches. Sustainability. 2021; 13 (16):9378.

Chicago/Turabian Style

Blessing Adeleke; John Kinuthia; Jonathan Oti. 2021. "Optimization of MgO-GGBS Cementitious Systems Using Thermo-Chemical Approaches." Sustainability 13, no. 16: 9378.

Journal article
Published: 08 December 2020 in Sustainability
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This study covers an in-depth investigation into the properties and practicality of the utilization of up to 40% Alumina Waste Filler (AWF) as a partial Portland Cement (PC) replacement material. AWF is a by-product from the recycling of aluminium, produced when salt slag is smelted and cleaned. Its use in concrete will lessen the landfill requirements for AWF disposal, and reduce the strain of the growing requirements and cost of PC. The results obtained from this study showed that the addition of AWF to the concrete mix caused a reduction in the compressive and tensile splitting strength values, and a less-workable concrete was achieved for every increase in the quantity of AWF added to each mix. The addition of AWF influenced the hydration reaction process and reduced the cumulative production of the heat of hydration over time, whilst the permeability of the concrete decreased.

ACS Style

Jonathan Oti; John Kinuthia; Blessing Adeleke. The Strength Characterisation of Concrete Made with Alumina Waste Filler. Sustainability 2020, 12, 10235 .

AMA Style

Jonathan Oti, John Kinuthia, Blessing Adeleke. The Strength Characterisation of Concrete Made with Alumina Waste Filler. Sustainability. 2020; 12 (24):10235.

Chicago/Turabian Style

Jonathan Oti; John Kinuthia; Blessing Adeleke. 2020. "The Strength Characterisation of Concrete Made with Alumina Waste Filler." Sustainability 12, no. 24: 10235.

Journal article
Published: 05 December 2020 in Sustainability
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Expansion of soils has been found to produce significant negative economic and environmental impact on various civil engineering infrastructure. This impact is more deleterious in soils containing sulphates, when treated with calcium-based stabilizers such as Lime and/or Portland cement (PC). The reported study investigated the strength and swell characteristics of Kaolinite clay artificially induced with high levels of Gypsum (sulphate) contents after stabilization with CEM I (PC), which is a calcium-based stabilizer. An optimum stabilizer content/Gypsum dosage, aimed at investigating the maximum magnitude of expansion possible using high levels of 10, 15 and 20% Gypsum contents (4.7, 7 and 9.3 wt.% sulphate) stabilized with calcium-based content of 7, 8, 9 and 10 wt.%. This was expected to provide further understanding on the mechanisms behind high sulphate-bearing clay soils, and the impact of sulphate and calcium content on strength and swell characteristics. The research outcomes showed that the introduction of sulphate to a Kaolinite clay soil reduces the compressive strength of the stabilised product by a factor range of 6–47% at 28 days curing age, while the swell behaviour is mainly dependent on both the sulphate content and curing age. Furthermore, the observed result suggests an 8 wt.% binder content to produce maximum magnitude of expansion (swell) with a high Gypsum content of 10% by weight. This finding is of economic importance, as it is expected to serve as a benchmark for further research on the stabilized clay systems, at high sulphate levels using sustainable binder materials.

ACS Style

Blessing Adeleke; John Kinuthia; Jonathan Oti. Strength and Swell Performance of High-Sulphate Kaolinite Clay Soil. Sustainability 2020, 12, 10164 .

AMA Style

Blessing Adeleke, John Kinuthia, Jonathan Oti. Strength and Swell Performance of High-Sulphate Kaolinite Clay Soil. Sustainability. 2020; 12 (23):10164.

Chicago/Turabian Style

Blessing Adeleke; John Kinuthia; Jonathan Oti. 2020. "Strength and Swell Performance of High-Sulphate Kaolinite Clay Soil." Sustainability 12, no. 23: 10164.

Original article
Published: 01 January 2019 in Latin American Journal of Solids and Structures
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This report presents a computational research on Eurocode 2 (EC2) tension lap lengths (lo) design in a normally reinforced concrete beam, using ANSYS Workbench simulation software program by simulating a laboratory 4-point beam loading test system under static loading(discrete model approach). A typical 4-point laboratory setup loading system was modelled using an innovative and sustainable Finite Element Analysis (FEA) approach. In order to investigate the EC2 tension lap lengths (lo) design recommendation, a total of 100 analysis cases of lap lengths were considered for different reinforcement bar diameters of 10mm, 12mm, 16mm, 20mm and 25mm. The study has considered beam failure types, effects of failure load on the various lap length reduction cases and effects of steel reinforcement bar size changes on the design lap lengths. The analysis of results revealed that the yield strength of steel (fyk), diameter of tension reinforcement bar, (db), tensile strength of concrete (fctd) and concrete cover (cd) are the main parameters for a tension lap length design according to EC2. While a linear relationship exists between tension steel reinforcement bar sizes (db) and the obtained lap lengths (lo). The study reveals a potential use of 15% and 20% reduction in lap length (lo) for tension steel reinforcement bar sizes of 10mm, 16mm and 12mm and 20mm in comparison with the recommended design lap length of EC2. It was concluded that EC2 tension lap length design recommendation is conservative.

ACS Style

Blessing Oluwaseun Adeleke; Samuel Jonah Abbey; Adegoke Omotayo Olubanwo. Numerical Investigation of Tension Reinforcement Lap Length of Eurocode 2 Using a Four-Point Beam Loading System. Latin American Journal of Solids and Structures 2019, 16, 1 .

AMA Style

Blessing Oluwaseun Adeleke, Samuel Jonah Abbey, Adegoke Omotayo Olubanwo. Numerical Investigation of Tension Reinforcement Lap Length of Eurocode 2 Using a Four-Point Beam Loading System. Latin American Journal of Solids and Structures. 2019; 16 (5):1.

Chicago/Turabian Style

Blessing Oluwaseun Adeleke; Samuel Jonah Abbey; Adegoke Omotayo Olubanwo. 2019. "Numerical Investigation of Tension Reinforcement Lap Length of Eurocode 2 Using a Four-Point Beam Loading System." Latin American Journal of Solids and Structures 16, no. 5: 1.