Abstract
For Rice Husk Ash (RHA) to be effective as a pozzolana, the fraction of Silica in amorphous state which exhibits high reactivity should be maximized by controlled burning. Due to practical difficulties, RHA produced in power plants and brick kilns in most parts of Sri Lanka does not contain significant fractions of amorphous Silica and thus have not shown high replacement potential of Cement in mortar or concrete. Thus, this study focussed on grinding RHA with high crystalline Silica content with the intention of producing higher reactive particle surface area to be used for partially replacing Cement in concrete. Main objective of the study was to find optimum partial replacement fraction of Cement by Ground Rice Husk Ash (GRHA) in concrete in terms of compressive strength. For the study, RHA samples from brick kilns around Anuradhapura, where higher burning temperatures are used, were collected and ground in a ball mill for a fixed duration for the transformation into GRHA with a similar fineness as Cement. Prescribed concrete mix proportions were used with Cement replaced by GRHA. Standard concrete cubes were tested for compressive strength and other related tests, such as tensile strength, permeability and heat of hydration, were conducted to check for deviations. These studies revealed that a 35% replacement of Cement by GRHA is the optimum value to satisfy relevant parameters of the prescribed concrete mix.
Highlights
For Rice Husk Ash (RHA) to be effective as a pozzolana, the fraction of Silica in amorphous state which exhibits high reactivity should be maximized by controlled burning
It is noted that the amounts of Calcium Oxide and Aluminum Oxide are significantly higher than the values in Table 2, which could be due to change in varieties of rice grown, which could influence the composition of respective RHA
RHA samples were create serious environmental as well as health taken from brick kilns in the Anuradhapura problems
Summary
For Rice Husk Ash (RHA) to be effective as a pozzolana, the fraction of Silica in amorphous state which exhibits high reactivity should be maximized by controlled burning. Standard concrete cubes were tested for compressive strength and other related tests, such as tensile strength, permeability and heat of hydration, were conducted to check for deviations These studies revealed that a 35% replacement of Cement by GRHA is the optimum value to satisfy relevant parameters of the prescribed concrete mix. ORCID ID: https://orcid.org/0000-0003-2700-9550 attempts have been made in rice producing countries to use Rice Husk Ash (RHA) for partial replacement of Hydraulic Cement in concrete and mortar production [2], [9], [12], Mr S. Using Rice Husk Ash to partially replace Cement provides several advantages, such as improved workability and durability properties in the produced mortar or concrete coupled with benefits related to the preservation of environment by reduction of waste disposal. The most significant benefit is the reduction of Carbon Footprint in construction, derived by lower usage of Hydraulic Cement
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