Optimization of mechanical properties of rice husk ash concrete using Scheffe’s theory

Abstract

In this research study, Scheffe's second degree polynomial based model was adapted for the optimization of the mechanical properties of a five component concrete. Here, rice husk ash which is derived from solid waste and contains high quantity of aluminosilicates which makes it a pozzolanic material is used as the fifth component in the concrete mixture. Applying Scheffe's statistical simplex methodology, the mixture formulations; a total of ninety concrete cubes of 150 × 150 × 150 mm dimension were produced including the control points used for testing the adequacy of the model. The concrete sample were cured for 28 days before crushing test is carried out to obtain its compressive strength. The maximum compressive strength of 33.45 N/mm 2 was achieved with a corresponding mix ratio of 0.60:0.65:1.30:1.60:0.35 for fraction of water, cement, fine aggregate, coarse aggregate and rice husk ash respectively. The Scheffe's model equation developed is Ŷ = . The formulated mathematical model was validated and a suitable relationship was observed between the experimental and predicted values based on the outcomes of student t test and analysis of variance. The model can predict the compressive strength of rice husk ash blended cement concrete so as to inform early decision making when used as construction material.

ANFIS Prediction Model for the Mechanical Properties of Soil and Activated Rice Husk Ash Blend for Sustainable Construction

“…The ash samples obtained according to relevant literature, satisfies the requirements of a pozzolanic material in accordance with British Standard International BS 8615-1 (2019) [36] and American Standard for Testing and Materials ASTM C618 [37] due to the presence of Al2O3, SiO2 and Fe2O3 in its chemical oxides' composition. The release of alumina-silica from the activated rice husk ash enables pozzolanic reaction in the clayey soil adsorbed complex interface through calcination and hydration to achieve stabilization of the problematic soil [38].…”

Experimental investigation of crude oil contaminated soil for sustainable concrete production

“…From the result of the calculated Coefficient of curvature for the fine aggregate C C lies outside the boundary condition of a well graded soil (C C > 6) and the Coefficient of uniformity C U lies between 1 < C U < 4 so the sand is said to be a POORLY GRADED soil which indicates that the sand has a poor depiction of particle sizes of all sizes. In the case of the contaminated soil, the Coefficient of curvature C C is less than 6 and the Coefficient of uniformity C U lies between 1 < C U < 4 so the soil is said to a POORLY GRADED soil [63].…”

El Uso del aditivo mineral como modificador de las propiedades mecánicas en el concreto: una revisión

“…Para la obtención del módulo de Young; además de los resultados teóricos es necesario la aproximación más exacta cuando se lleva a cabo de manera experimental; sobre todo en la determinación de deflexiones, cuando se prueban a flexión, por ejemplo, vigas de sección longitudinal y en L; además de ello se trate del tipo de tecnología de geopolímeros con adición del 40% de EAHG en comparación con la del concreto convencional (CC) la relación de tensión versus deformación aumenta en un 34 y 20%; los resultados experimentales se miden en un software (ANSYS) y al compararse se observan magnitudes más conservadoras (Antonyamaladhas , et al, 2016). La teoría de Schaeffer para el diseño de celosía simplex también está siendo usado como alternativa en la obtención de la optimización de resistencia a la compresión mediante la formulación de un polinomio de segundo grado (Attah, et al, 2020).…”