Department of Chemistry
P.O. Box 43844, -00100, or
P.O. Box 74862-00200,
Nairobi, Kenya
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Telephone 8710901Ext.527;0733764313:

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‘Pozzolana based     cement from     industrial and agricultural waste materials (Pat Ref. No.     KE/P/2003/00394, WIPO ref. No. IC/04/1734/KE-CA


  • Study on the effect of Thiobacillus intermediusbacteria on thephysico-mechanical properties of mortars of ordinary portland cement Onesmus Mulwa Munyaoa,*, Joseph Karanja Thiong'oa, Jackson Wachira Muthengiab,Daniel Karanja Mutitub, Romano Mwirichiac, Genson Muriithib, Joseph Mwiti Marangu September 2019; Received in revised form 5 January 2020; Accepted 10 January 20202405-8440/©2020 The Author(s). Published by Elsevier Ltd. 2019‘,
  •  Performance of Ground Clay Brick Mortars in Simulated Chloride and Sulphate Media Festus Ngui Musyimi,1Jackson Muthengia Wachira,2Joseph Karanja Thiong’o,1and Joseph Mwiti Marangu HindawiJournal of EngineeringVolume 2019, Article ID 6430868, 12 Received 13 May 2019; Accepted 31 July 2019; Published 3 November 2019 pages
  •  Influence of Lysinibacillus sphaericus on compressive strength and water sorptivity in microbial cement mortar Crossref DOI link: Published: 2019-11 Mutitu, Daniel Karanja , Wachira, Jackson Muthengia, Mwirichia, Romano, Thiong'o, Joseph Karanja, Munyao, Onesmus Mulwa , Muriithi, Genson 
  • Pyroprocessing and the optimum mix ratio of rice husks, broken bricks and spent bleaching earth to make pozzolanic cement Protus Nalobile,a,∗∗ Jackson Muthengia Wachira,b Joseph Karanja Thiong'o,a and Joseph Mwiti Maranguc,∗ Heliyon. 2019 Sep; 5(9): e02443.  Published online 2019 Sep 9. doi: 10.1016/j.heliyon.2019.e02443 PMCID: PMC6739460
  • Effects of biocementation on some properties of cement-based materials incorporating BacillusSpecies bacteria – a review,  Journal of Sustainable Cement-Based Materials, DOI: 10.1080/21650373.2019.1640141 To link to this article: Karanja D. Mutitu, Mulwa O. Munyao, Muthengia J. Wachira, Romano Mwirichia, Karanja J. Thiong'o & Mwiti J. Marangu (2019):
  • Use of Bacillus Species Bacteria in Protecting the Concrete Structures from Sulphate Attack-A Review  Journal of Chemical Reviews, 2019, Volume 1, Issue 4, Pages 287-299
    [Receive Date: 27 August 2019,  Revise Date: 23 October 2019,  Accept Date: 31 October 2019] Onesmus Mulwa Munyao, Joseph Karanja Thiong’o, Jackson Muthengia Wachira, Daniel Karanja Mutitu, Mwirichia Romano, Genson Murithi
  • Review of Carbonation Resistance in Hydrated Cement Based Materials JosephMwitiMarangu ,1 JosephKaranjaThiong’o,1 and JacksonMuthengiaWachira 2 Hindawi Journal of Chemistry Volume 2019, Article ID 8489671, 6 pages 
  • Properties of activated blended cement containing high content of calcined clay  Marangu J. Mwiti, Thiong’o J. Karanja, Wachira J. Muthengia, , Heliyon 4 (2018)e00742 doi. 10.1016/j.heliyon.2018.e00742
  • Physicochemical Performance of Portland-Rice Husk Ash-Calcined Clay-Dried Acetylene Lime Sludge Cement in Sulphate and Chloride Media. Jackson Muthengia Wachira ,1 Joseph Karanja Thiong’o,2 Joseph Mwiti Marangu  ,3 and Leonard Genson Murithi1, 1Department of Physical Sciences, University of Embu, Embu, Kenya, 2Department of Chemistry, Kenyatta University, Nairobi, Kenya, 3Department of Physical Sciences, Meru University of Science and Technology, Meru, Kenya. Academic Editor: Robert Černý Received01 Dec 2018, Revised12 Mar 2019 Accepted17 Mar 2019 Published08 Apr 2019
    Hindawi Advances in Materials Science and EngineeringVolume 2019, Article ID 5618743, 12 pages Article | Open Access, Volume 2019 |Article ID 5618743 | 12 pages | 
  • Marangu, J. M.; Thiong’o, J. K.; Wachira, J. M. Chloride Ingress in Chemically Activated Calcined Clay-Based Cement. J. Chem. 2018, 2018, 1–8, doi:10.1155/2018/1595230.
  • Genson Murithi, Karanja wa Thiong’o, Wachira Muthengia, Fixed Column Removal of Lead (II) Ions from Industrial Effluent using Pig Bone Char, Rice-Husks Ash and Water Hyacinth Composite Adsorbent Volume 7 Issue 2, February 2018, pp1283-1287
  • Marangu J.M, Wa- Thiong’o J.K and Muthengia J.W (2017). Effects of Potential Chloride-Free Admixtures on Selected Mechanical Properties of Kenya Clay-Based Cement Mortars. Proceedings of the 19th International Conference on Cement and Concrete Chemistry. Journal of Chemical and Molecular Engineering Vol:4, No:10, 2017, Istanbul, Turkey, October 26-27, 2017
  • Genson Murithi, Karanja wa Thiong’o, Wachira Muthengia, ‘Equilibrium Studies for Adsorption of Zn2+ on to Acid Treated Kikuyu Grass Pennisetum Clandestinum Biomass’ International Journal of Science and Research (IJSR), ISSN (Online): 2319-7064, Vol 5 Issue 4, April 2016, 1754-1760
  • Genson Murithi, Karanja wa Thiong’o, Wachira Muthengia, ‘Ashed SBE Adsorbent for Lead and Zinc (II) Ions: Kinetic and Equilibrium Studies’, International Journal of Science and Research (IJSR), Volume 5 Issue 3, March 2016, 1729-1734
  • Genson Murithi, Karanja wa Thiong’o, Kariuki S. Warui, Wachira Muthengia, ‘Fixed Column Study for the Removal of Zinc (II) Ions from Waste Water by Bone Char Rice Husks Ash and Water Hyacinth Composite-Mixture’, International Journal of Science and Research (IJSR), Volume 5 Issue 2, February 2016
  • Mutitu D. K., Karanja J.K., Wachira J.M., ‘Diffusivity of Chloride Ion in Mortar Cubes Made Using Ordinary Portland and Portland Pozzolana Cements’ IOSR Journal of Applied Chemistry(IOSR-JAC), e-ISSN: 2278-5736. Volume 7, Issue 2 Ver. I. (Mar-Apr. 2014), PP 67-73 2014
  • Marangu J.M, Muthengia J.W. and wa- Thiong’o J.K., ‘Performance of Potential Pozzolanic Cement in Chloride Media’ IOSR Journal of Applied Chemistry (IOSR-JAC) e-ISSN: 2278-5736. Volume 7, Issue 2 Ver. I. (Mar-Apr. 2014), PP 36-44
  • Muthengia Jackson Wachira, Muthakia Gerald Kanyago and Thiong’o Joseph Karanja(2012) ‘Cementing material from rice husk-broken bricks-spent bleaching earth-dried calcium carbide residue’, Mediterranean Journal of Chemistry 2(2), 400-407
  • Enos W. Wambu, Gerald K. Muthakia, Joseph K. Wa-Thiong’o and Paul M. Shiundu, ‘Kinetics and Thermodynamics of Aqueous Cu(II)Adsorption on heat regenerated spent bleaching earth’ Bulletin of the Chemical Society of Ethiopia, 2011, 25(2), 181-190
  • Enos W. Wambu, Gerald K. Muthakia, Joseph K. wa-Thiong’o, Paul M. Shiundu(2009), ‘Regeneration of spent bleaching earth and its adsorption of copper (II) ions from aqueous solutions’, Applied Clay Science 46 (2009) 176-180
  • Enos W. Wambu, Gerald K. Muthakia, Paul M. Shiundu and Karanja J. Wa Thiongo, ‘Kinetics of Copper Desorption from Regenerated Spent Bleaching Earth’, American-Eurasian Journal of Scientific Research, 4(4),:317-323, 2009

Presentation of Papers at Academic and Professional Conferences

  • April 2016, Dr. Karanja Thiong’o, ‘The Basics of effective school management for enhanced Performance’, ACC&S Head Teachers Association, Seminar, Nakuru, Kenya
  • Dr. Karanja Thiong’o, ‘Bridging the gap between Africa and Middle East: Local Solutions in Africa’, Africa Rising Seminar, Organised by AFFRONTA and Dubai Multi Commodities Centre (DMCC), Dubai, UAE, 15th April 2015 at Almas Tower, Jumeira Lake Towers, Dubai, U.A.E.
  • Dr. Karanja Thiong’o, ‘A study of Corporate Governance Practices and Link to Performance in Kenyan Corporations’ A discussant Paper, Centre for Corporate Governance, Research Dissemination Workshop, Crownnie Plaza Hotel, Nairobi, 2011
  • Dr. Karanja Thiong’o, ‘ Research Innovation and Incubation: A market oriented approach’ , Kenya Chemical Society Workshop, Nairobi Polytechnic University, 2013
  • 2011: ‘Rural Industrialization is key for realization of Vision 2030’, Chief Guest Speech, Graduation Ceremony for Gatanga Enterprises Development in Partnership with the Kenya Industrial Entrepreneursship Development and the Department of Gender and Social Development, Gatanga, 16th November, 2011.
  • 2008: ‘Becoming a Success in Education-Related Careers’, Gatanga Constituency Careers’ Day, Kirwara Secondary School, Murang’a County

 Convening and Co-ordinating Conferences

  • 15th April 2015, Coordinated a one day Seminar on Africa Rising in Dubai Almas Tower, Jumeira Lake Towers, UAE
  • 2012, Convened and Chaired, Kenya Bureau of Standards Strategic Plan, 2012-2017, Amboseli Serena Hotel
  • 2009, Member of coordinating Committee, 6th International Conference, The Kenya Chemical Society, Reef Hotel, Mombasa Kenya