Browsing School of Pure and Applied Sciences by Author "Marangu, Joseph Mwiti"
Now showing items 1-19 of 19
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Characterization of Composite Material from the Copolymerized Polyphenolic Matrix with treated Cassava Peels Starch
Kariuki, Stephen Warui; Muthengia, Jackson Wachira; Erastus, Millien Kawira; Leonard, Genson Murithi; Marangu, Joseph Mwiti (Elsevier, 2020)Conventional binders in the particleboards formulation involve use of formaldehyde resins. Epidemiologic studies show that formaldehyde is carcinogenic. Efforts to reduce formaldehyde emissions by use of scavengers has not ... -
Chloride Diffusivity in Blended Cement Made from Selected Industrial and Agrowastes
Wachira, Jackson Muthengia; Marangu, Joseph Mwiti (Hindawi, 2020)This paper reports study findings on the diffusivity of chloride ions in potential blended cement. The cement, abbreviated as PCDC, was made from blending ordinary Portland cement (OPC) with dried calcium carbide residue ... -
Chloride Ingress in Chemically Activated Calcined Clay-Based Cement
Marangu, Joseph Mwiti; Thiong’o, Joseph Karanja; Wachira, Jackson Muthengia (Elsevier, 2018)Chloride-laden environments pose serious durability concerns in cement based materials. This paper presents the findings of chloride ingress in chemically activated calcined Clay-Ordinary Portland Cement blended mortars. ... -
Effect of Sulphate and Chloride Ingress on Selected Cements Mortar Prisms Immersed in Seawater and Leather Industry Effluent
Wachira, Jackson Muthengia; Ngari, Reginah Wangui; Thiong’o, Joseph Karanja; Marangu, Joseph Mwiti (Hindawi, 2019)Cement structures are major capital investments globally. However, exposure of cement-based materials to aggressive media such as chloride- and sulphate-laden environments such as coastal areas affects their performance. ... -
Effects of Biocementation on some Properties of Cement-Based Materials Incorporating Bacillus Species Bacteria
Mutitu, Daniel Karanja; Munyao, Onesmus; Muthengia, Jackson; Mwirichia, Romano; Thiong'o, Karanja J.; Marangu, Joseph Mwiti (Taylor & Francis, 2019)There is a growing need in the construction industry to improve transfer and durability aspects of Portland pozzolana cement. Ureolytic bacteria have recently emerged as potential micro-organisms well known for precipitation ... -
Effects of Sulfuric Acid Attack on Hydrated Calcined Clay Limestone Cement Mortars
Marangu, Joseph Mwiti (Taylor & Francis, 2020)The paper presents experimental findings on the performance of Limestone Calcined Clay Cement (LC3) in acidic media. LC3 was made by inter-grinding a blend of 50 % clinker with ground 30 % Fired Rejected Clay Bricks (FRCB), ... -
Evaluation of Kunkur Fines for Utilization in the Production of Ternary Blended Cements
Mutai, Victor Kiptoo; Marangu, Joseph Mwiti; M’Thiruaine, Cyprian Muturia; Valentini, Luca (MDPI, 2023-11-30)Ternary blended cements, such as limestone calcined clay cement (LC3), represent a type of strategic binder for the mitigation of environmental impacts associated with cement production. These are estimated to reduce CO2 ... -
Performance of Ground Clay Brick Mortars in Simulated Chloride and Sulphate Media
Musyimi, Festus Ngui; Wachira, Jackson Muthengia; Thiong’o, Joseph Karanja; Marangu, Joseph Mwiti (Hindawi, 2019)The durability of cement-based structures majorly depends on their resistivity to the aggressive media in the construction environment. The most aggressive ions commonly encountered in construction environment are chloride ... -
Physico-Chemical Properties of Kenyan made Calcined Clay-Limestone Cement (LC3).
Marangu, Joseph Mwiti (Elsevier, 2020)In Kenya fired clay bricks are mainly used as construction materials. However, vast quantities of these Fired Rejected Clay Bricks (FRCB) generated are rejected annually as a result of improper calcination or demolition ... -
Physicochemical Performance of Portland-Rice Husk Ash-Calcined Clay-Dried Acetylene Lime Sludge Cement in Sulphate and Chloride Media
Wachira, Jackson Muthengia; Thiong’o, Joseph Karanja; Marangu, Joseph Mwiti; Murithi, Leonard Genson (ResearchGate GmbH, 2019)This paper reports leach and/or intake of SO42−, Cl−, Ca2+, Na+, and K+ from and/or into cement mortar cubes made from a novel cementious material in naturally encountered environmental simulated media. The paper also ... -
Physicochemical Properties of Hydrated Portland Cement Blended with Rice Husk Ash
Marangu, Joseph Mwiti; M’thiruaine, Cyprian Muturia; Bediako, Mark (Hindawi, 2020)In the presence of significant quantities of carbon dioxide (CO2) and elevated temperatures in the atmosphere due to climate change, cement-based materials are susceptible to carbonation. Blended cements are more prone to ... -
Potential for Selected Kenyan Clay in Production of Limestone Calcined Clay Cement
Marangu, Joseph Mwiti; Riding, Kyle; Alaibani, Anfal; Zayed, Abla; Thiong’o, Joseph Karanja; Wachira, Jackson Muthengia (Springer, 2020)The potential for calcined clay, and in particular Limestone Calcined Clay Cement (LC3), to be used in concrete in Kenya was examined in this study. Locations of clay sources and existing mining infrastructure were examined ... -
Prediction of Compressive Strength of Calcined Clay Based Cement Mortars Using Support Vector Machine and Artificial Neural Network Techniques
Marangu, Joseph Mwiti (Research Gate, 2020)Prediction of strength in cement based materials is vital in construction industry as it forms the basis upon which important tasks can be performed such as the time for mortar form removal, project scheduling and quality ... -
Pyroprocessing and the Optimum Mix Ratio of Rice Husks, Broken Bricks and Spent Bleaching Earth to Make Pozzolanic Cement
Nalobile, Protus; Wachira, Jackson Muthengia; Thiong'o, Joseph Karanja; Marangu, Joseph Mwiti (Elsevier, 2019)This paper presents the findings of an experimental investigation on optimizing pozzolanic activity of a blend of Rice Husks (RH), Spent Bleaching Earth (SBE) and Broken Bricks (BB) to form pozzolana that would have ... -
Review of Carbonation Resistance in Hydrated Cement Based Materials
Marangu, Joseph Mwiti; Thiong, Joseph Karanja; Muthengia, Wachira J. (Elsevier, 2019)Blended cements are preferred to Ordinary Portland Cement (OPC) in construction industry due to costs and technological and environmental benefits associated with them. Prevalence of significant quantities of carbon dioxide ... -
Review of Clay-Based Nanocomposites as Adsorbents for the Removal of Heavy Metals
Kinoti, Ismael Kithinji; Karanja, Esther Muthoni; Nthiga, Esther Wanja; M’thiruaine, Cyprian Muturia; Marangu, Joseph Mwiti (Hindawi, 2022-06-22)Due to rapid industrialization, urbanization, and surge in modern human activities, water contamination is a major threat to humanity globally. Contaminants ranging from organic compounds, dyes, to inorganic heavy metals ... -
A Review on Pyroprocessing Techniques for Selected Wastes Used for Blended Cement Production Applications
Nalobile, Protus; Muthengia, Wachira J.; Thiong’o, Joseph Karanja; Marangu, Joseph Mwiti (Elsevier, 2020)Pyroprocessing is an important stage in cement manufacturing. In this process, materials are subjected to high temperatures so asto cause a chemical or physical change. Its control improves efficiency in energy utilization ... -
Study on the Effect of Thiobacillus Intermedius Bacteria on the Physico-Mechanical Properties of Mortars of Ordinary Portland Cement
Munyao, Onesmus Mulwa; Thiong'o, Joseph Karanja; Muthengia, Jackson Wachira; Mutitu, Daniel Karanja; Mwirichia, Romano; Muriithi, Genson; Marangu, Joseph Mwiti (PubMed, 2020)Most of concrete structural failures are attributed to poor workmanship and poor engineering designs. Some microorganisms present in sewer systems can degrade the concrete and/or mortar. Concrete failures due to microbial ... -
Use of zeolites in wastewater remediation
Kinoti, Ismael Kithinji; M’thiruaine, Cyprian Muturia; Marangu, Joseph Mwiti (Meru University of Science and Technology, 2022-06)Huge amounts of wastewater in low and lower-middle-income countries is released into the environment in untreated forms due to an increase in anthropogenic activities and disposal in water bodies. Pollution in water ...