Browsing Journals: Department of Physical Sciences by Author "Wachira, Jackson M."
Now showing items 21-30 of 30
-
Influence of Lysinibacillus sphaericus on compressive strength and water sorptivity in microbial cement mortar
Mutitu, Daniel Karanja; Wachira, Jackson M.; Mwirichia, Romano K.; Thiong'o, Joseph Karanja; Munyao, Onesmus Mulwa; Muriithi, Genson (Elsevier, 2019-11)Cement structures are subject to degradation either by aggressive media or development of micro/macro cracks which create external substance ingress pathways. Microbiocementation can be employed as a self-intelligent solution ... -
Influence of Starkeya novella on Mechanical and Microstructural Properties of Cement Mortars
Munyao, Onesmus Mulwa; Thiong’o, Joseph K.; Wachira, Jackson M.; Mutitu, Daniel Karanja; Mwirichia, Romano K. (Hindawi, 2020-04)Cement-based materials are subject to degradation during their service life. Most of the structural failures have been associated with corrosion of the rebar due to chloride ingress, alkali aggregate reaction, and/or sulfate ... -
Magnetic Concentration of Iron in Lateritic Soils from Kamahuha, Murang’a County, in Kenya using Carbon Monoxide Generated In-Situ
Njoroge, P. W.; Mutembei, Peterson K.; Wachira, Jackson M.; Wanjau, R. (IJSET, 2014-08)Chemical and Mineral Analyses of laterites from selected sites in Kamahuha area of Murang’a County, in the Republic of Kenya, have been carried out with particular interest in the levels of iron and the type of minerals ... -
Performance of Potential Pozzolanic Cement in Chloride media
Marangu, J.M.; Wachira, Jackson M.; wa- Thiong‟o, J.K. (2014-04)The paper presents finding of the pozzolanic activity of calcined clays from selected regions of Embu County – Kenya. The results are also presented for the compressive strength development and Chloride ingress resistance ... -
Physicochemical Performance of Portland-Rice Husk Ash-Calcined Clay-Dried Acetylene Lime Sludge Cement in Sulphate and Chloride Media
Wachira, Jackson M.; Thiong’o, Joseph K.; Marangu, Joseph M.; Murithi, Leonard G (Hindawi, 2019-03)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 ... -
Properties of activated blended cement containing high content of calcined clay
Marangu, Joseph M.; Karanja, Thiong’o J.; Wachira, Jackson M. (Elsevier, 2018-08)This paper presents findings of an experimental investigation on sodium sulphate (Na2SO4) activated calcined clay e Portland cement blends in sulphuric acid media. Calcined clays were blended with Ordinary Portland Cement ... -
Properties of activated blended cement containing high content of calcined clay
Mwiti, Marangu J.; Karanja, Thiong’o J.; Wachira, Jackson M. (Elsevier, 2018-08)This paper presents findings of an experimental investigation on sodium sulphate (Na2SO4) activated calcined clay e Portland cement blends in sulphuric acid media. Calcined clays were blended with Ordinary Portland Cement ... -
Review of Carbonation Resistance in Hydrated Cement Based Materials
Marangu, Joseph Mwiti; Thiong’o, Joseph Karanja; Wachira, Jackson M. (Hindawi, 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 Carbonation Resistance in Hydrated Cement Based Materials
Marangu, Joseph Mwiti; Thiong’o, Joseph Karanja; Wachira, Jackson M. (Hindawi, 2019-01)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 ... -
A Review on Pyroprocessing Techniques for Selected Wastes Used for Blended Cement Production Applications
Nalobile, Protus; Wachira, Jackson M.; Thiong’o, Joseph K.; Marangu, Joseph M. (Hindawi, 2020-08)Pyroprocessing is an important stage in cement manufacturing. In this process, materials are subjected to high temperatures so as to cause a chemical or physical change. Its control improves efficiency in energy utilization ...