Optimization of the Compressive Strength Characteristics of Four-Component Concrete Mixes Made with Unwashed Local Gravel using Second-Degree Polynomial


Authors : Arogo Eyaramuuonan Charles; Adinna Boniface Okafor

Volume/Issue : Volume 8 - 2023, Issue 6 - June

Google Scholar : https://bit.ly/43uxUln

Scribd : https://tinyurl.com/vj3f8nwa

DOI : https://doi.org/10.5281/zenodo.8137993

Abstract : Being able to predict the strength characteristics of concrete can be of great advantage in the design and construction of structural members. This research work set out to develop a model for the compressive strength characteristics of concrete made with unwashed local grave based on Prof. Osadebe’s optimization theory or second-degree polynomial. The unwashed aggregate was from Abagana and the river sand from Amansea, both in Anambra State. These aggregates were tested for their physical and mechanical properties based on BS 812: Part 2:1975 and BS 812: Part 3: 1975. Sixty concrete cubes of dimensions 150 mm X 150mm X 150mm —three cubes for each experimental point were made, cured and tested according to BS 1881:1983. The model equation developed was Ŷ= - 2006.1Z1+ 1401.02Z2 -90.3Z3 -105.47Z4 +91.79Z1Z2 -- 9086Z1Z3 + 3268.26Z1Z4 +7888.31Z2Z3 -1636.57Z2Z4 +427.5Z3Z4. The student’s t-test and the Fisher’s test were used to prove the adequacy of the model. The strengths predicted by the model were in complete agreement with the experimentally obtained values and the null hypothesis was satisfied.

Keywords : Characteristics, Compressive, Concrete, Component, Local Gravel, Mixes, Optimization, Polynomial, Second-Degree, Strength, Unwashed.

Being able to predict the strength characteristics of concrete can be of great advantage in the design and construction of structural members. This research work set out to develop a model for the compressive strength characteristics of concrete made with unwashed local grave based on Prof. Osadebe’s optimization theory or second-degree polynomial. The unwashed aggregate was from Abagana and the river sand from Amansea, both in Anambra State. These aggregates were tested for their physical and mechanical properties based on BS 812: Part 2:1975 and BS 812: Part 3: 1975. Sixty concrete cubes of dimensions 150 mm X 150mm X 150mm —three cubes for each experimental point were made, cured and tested according to BS 1881:1983. The model equation developed was Ŷ= - 2006.1Z1+ 1401.02Z2 -90.3Z3 -105.47Z4 +91.79Z1Z2 -- 9086Z1Z3 + 3268.26Z1Z4 +7888.31Z2Z3 -1636.57Z2Z4 +427.5Z3Z4. The student’s t-test and the Fisher’s test were used to prove the adequacy of the model. The strengths predicted by the model were in complete agreement with the experimentally obtained values and the null hypothesis was satisfied.

Keywords : Characteristics, Compressive, Concrete, Component, Local Gravel, Mixes, Optimization, Polynomial, Second-Degree, Strength, Unwashed.

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