Optimization of Compressive Strength of Concrete Made with Partial Replacement of Cement with Cassava Peel Ash CPA and Rice Husk Ash RHA using Scheffe’s 6,3 Model

This research work is aimed at using Scheffe's Third Degree Model for six component mixtures, Scheffe's 6,3 to optimize the compressive strength of concrete made through partial replacement of 60 percent of cement with 30 percent of Cassava Peel Ash CPA and 30 percent of Rice Husk Ash RHA . Before now, Nwachukwu and others 2022i has carried out research on the subject matter based on the Scheffe's second degree model. Due to the upper hand that the third degree has over the second degree in terms of improved compressive strength, this recent work has become very essential. Through the use of Scheffe's Simplex optimization method, the compressive strengths of the present work based on the third degree model were obtained for 112 different mix proportions. Control experiments were also carried out, and the compressive strengths evaluated. The adequacy of the third degree model was confirmed through the use of the Student's t test statistics. The highest compressive strength was obtained as 43.75 MPa which is slightly higher than the maximum value obtained by Nwachukwu and others 2022i based on the second degree model. Again, the maximum value is higher than the minimum value specified by the American Concrete Institute ACI , as 20 MPa and also the minimum value specified by ASTM C 39 or ASTM C 469, as 30.75 for good concrete. Thus, the compressive strength value can sustain construction of light weight structures such as construction of Walkways, Pavement slabs etc and some heavy weight structures such as Bridges, Airports etc at the best possible economic and safety advantages. K. C. Nwachukwu | O. Oguaghamba | H. O. Ozioko | B. O. Mama "Optimization of Compressive Strength of Concrete Made with Partial Replacement of Cement with Cassava Peel Ash (CPA) and Rice Husk Ash (RHA) using Scheffe's (6,3) Model" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-7 | Issue-2 , April 2023, URL: https://www.ijtsrd.com.com/papers/ijtsrd55162.pdf Paper URL: https://www.ijtsrd.com.com/engineering/civil-engineering/55162/optimization-of-compressive-strength-of-concrete-made-with-partial-replacement-of-cement-with-cassava-peel-ash-cpa-and-rice-husk-ash-rha-using-scheffe's-63-model/k-c-nwachukwu