|
Ojinta, P. E.
Department of Civil Engineering, Michael Okpara University of Agriculture, Umudike, Abia State
Ngene, B. U.
Department of Civil Engineering, Michael Okpara University of Agriculture, Umudike, Abia State
Ibe, K. C.
Department of Civil Engineering, Michael Okpara University of Agriculture, Umudike, Abia State
ABSTRACT
This study aimed at
prediction of the compressive strength of cement blended Fly Ash-Periwinkle
shell ash sandcrete blocks using Scheffe’s simplex theory. A total of ninety
(90) fly ash-PSA solid sandcrete blocks of dimensions 450 x 125 x 225 mm were
cast, consisting of three (3) blocks per mix ratio and for a total of thirty
(30) mix ratios, comprising of fifteen (15) mix ratios each for both trial and
control mixes. The first fifteen (15) mixes were used to develop the model
while the other fifteen (15) were used to validate the model. The model
predicted results were compared with the one obtained from the laboratory. The
results showed that the percentage differences ranges from 8.16% to
15.34%. The model predictions were
tested for adequacy using statistical Students t-test at 95% confidence level,
and were found to be adequate. Computer program was developed for the Scheffe’s
model using Visual Basic 6.0. The mathematical model results compared
favourably with the experimental results. The optimum experimental compressive
strength of the blended sandcrete after 28 days of curing was found to be
4.68N/mm2 for experimental compressive strength while the model predictive
compressive strength recorded an optimum compressive strength of 4.26 N/mm2.
Keywords: Sandcrete blocks, compressive strength, cement, Fly Ash, Periwinkle Shell Ash
https://doi.org/10.33922/j.ujet_v11i2_6
|
View: 22 | Download: 5
Published
Monday, July 14, 2025
Issue
Vol. 11 No. 2, December 2025
Article Section
GENERAL
The contents of the articles are the sole opinion of the author(s) and not of UJET.
|
