Characteristics of Ordinary Portland Cement Paste Containing Rice Husk Ash and Conplast


  • Elinwa Augustine Uchechukwu Civil Engineering Department, Abubakar Tafawa Balewa University, Bauchi, Bauchi State, Nigeria
  • Johnson Olomi Olakunle Works Department, University of Jos Teaching Hospital, Jos, Plateau State, Nigeria
  • Samson Duna Department of Civil Engineering, Abubakar Tafawa Balewa University, Bauchi, Nigeria

Received: 25 November 2021; Accepted: 20 December 2021; Published Online: 10 January 2022


An experimental investigation on rice husk ash (RHA) and Conplast SP 430 (CP-admixture) was carried out to evaluate their effects on the paste characteristics (soundness, consistency, initial and final setting times). The cement content used was 300g and the brand was ‘Ashaka’ Portland cement conforming to BS EN 12 1973. Various combinations of the mixtures OPC-RHA-CP-admixture were used to establish performance characteristics of the pastes. Statistical characteristics, and linear regression models (no-transformation, λ = 0.5, and Box-Cox transformation) were developed on the experimental data for decisions on their performances.



Rice husk ash, Conplast SP 430, Paste characteristics, Statistics and Linear regression


[1] Altine, J., Mamai, E.A., Bako, T., 2019. Rice waste conversion for economic empowerment in Taraba State, Nigeria: A review. IJTRD. 515-519.

[2] Abubakar, A.U., 2018. Progress on the use of rice husk ash (RHA) as a construction material in Nigeria. Sustainable Structure and Material. 1(2), 1-8.

[3] Darweesh, H.H.M., 2016. Black liquor waste as a cement admixture or cement and concrete admixtures. Biopolymers and Biotech Admixtures for Eco-Efficient Construction Materials. 99-130.

[4] Habeeb, G.A., Mahmud, H.B., 2010. Study on properties of rice husk ash and its use as cement replacement material, Materials Research. 13(2), 185-190.

[5] Dobiszewska, M., Beycioğlu, A. Investigating the influence of waste basalt powder on selected properties of cement paste and mortar. IOP Conf Materials Science and Engineering. 245.

[6] Samantasinghar, S., Singh, S.P., 2019. Fresh and hardened properties of fly ash-slag blended geopolymer paste and mortar. Int. J. Concr Struct Mater. 13, 47, 1-12.

[7] Conplast SP 430. Al Gurg FOSOOC LLC, Box 657, Duba, UAE.

[8] Elinwa, A.U., Mahmood, Y.A., 2002. Ash from timber waste as cement replacement material. Cement and Concrete Composites. 24(2), 219-222.

[9] Alkheder, S., Obaidat, Y.T., Taamneh, M., 2016. Effect of olive waste (Husk) on behavior of cement paste.” Case Studies in Construction Materials. 5, 19-25.

[10] Mbugua, R., Salim, R., Ndambuki, J., 2016. Effect of Gum Arabic karroo as a Water-Reducing Admixture in Concrete. Materials. 9, 80, 1-16.

[11] Elinwa, A.U., 2016. Hospital ash waste-ordinary Portland cement concrete. Science Research. 4(3), 72-78.

[12] Elinwa, A.U., Abdulrazaq, A.A. Characteristics of polyvinyl chloride powder cement paste and concrete.” Global Science Journal. 8(12), 377-388.

[13] BS EN 197, 2011. Cement Part 1: Composition, specifications and conformity criteria for common cements.

[14] ASTM C 618-12. Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete.

[15] ASTM C 494-92. Standard Specification for Chemical Admixtures for Concrete.

[16] BS 4550-3.4, 1978. Methods of Testing Cement, Physical Tests-Strength Tests.

[17] BS 12: 1996. Specification for Portland Cement.


How to Cite

Uchechukwu, E. A., Olakunle, J. O., & Duna, S. (2022). Characteristics of Ordinary Portland Cement Paste Containing Rice Husk Ash and Conplast. Journal of Building Material Science, 4(1), 1–10.


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