Regression Modeling of the Compressive Strengths of Interlocking Hollow Blocks with Rice Husk Ash as Partial Replacement to Cement

Abstract

In order to arrest the incidence of global warming brought about by the emission of greenhouse gases notably carbon dioxide (CO2) into the atmosphere, the use of materials that can substitute the material responsible for greenhouse gases is being promoted worldwide. One of these is Rice Husk Ash (RHA) which has been found suitable by researchers to partially replace Portland cement in the production of concrete. It has been demonstrated by numerous researchers that adding rice husk ash to cementitious materials, also known as pozzolanic materials, such as blast furnace slag, silica fume, metakaolin (MK), fly ash (FA), and rice husk ash (RHA), among others, improves the various properties of concrete and lowers construction costs using hollow blocks with contemporary design and interconnecting keys (protrusions and grooves). Furthermore, it is relative that the most effective replacement of rice husk ash is 10% which has a significant increase of more than 34% compared to the controlled variable in terms of compressive strength. The optimum percentage of replacement of rice husk ash is attained at 10%. The best regression modeling is y=-2784x^3+497.6x^2-14x+2.312, where x is the % of RHA replacement and y is the Compressive Strength, having 100% accuracy.