Mechanical Behavior of Concrete Modified by Replacement of Cement by Rice Husk Ash

Saravanan, M.; Sivaraja, M.

doi:10.1590/1678-4324-2016161072

Cited by 12 publications

(6 citation statements)

References 10 publications

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“…In contrast with 20 and 30% RHA replacement, PC-RHA exhibited a compressive strength of approximately 3% lower than PC. The findings agree with the experimental report that Saravanan and Sivaraja [72] mentioned. In their study, the replacement of more than 20% untreated RHA has a negative impact on the compressive strength of the combination.…”

Section: Compressive Strength and Optimum MIX Proportionsupporting

confidence: 93%

Comparative Experimental Study of Sustainable Reinforced Portland Cement Concrete and Geopolymer Concrete Beams Using Rice Husk Ash

et al. 2022

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The ordinary Portland cement (PC) manufacturing process emits toxic carbon dioxide into the environment. Minimizing cement consumption in the construction industry is a major scholarly priority. This paper studies the comparison of reinforced Portland cement concrete and geopolymer concrete beams, in which rice husk ash (RHA) is used as a partial replacement for cement. The study aims to determine the optimum mix proportion of Portland cement concrete with RHA (PC-RHA) and geopolymer concrete with RHA (GC-RHA) for compressive strength that meets the requirements for normal strength concrete of 18, 25, and 32 MPa and compares to ones of the control PC without RHA. Then, the load behaviors and the failure modes of the reinforced PCC beam and reinforced GC beam using RHA as partially PC (PC-RHA beam and GC-RHA beam) were investigated. The obtained experimental load capabilities were also compared to ones predicted by the equation for designing reinforced concrete beams developed by ACI Committee 318. According to the test results, the compressive strength of the PC-RHA and GC-RHA decreased when there was a higher proportion of RHA replacement in the concrete. In terms of the structural behavior, all the PCC, PC-RHA, and GC-RHA beam curves are bilinear up to the first crack load and before the yield load, then become nonlinear after the yield load of the beam specimens. The maximum crack width of the GC-RHA beam was less than that of the PC-RHA beam. Furthermore, the GC-RHA beam was more ductile than the PC-RHA beam. Finally, the ACI equation provides reliable predictions with a margin of error of 4 to 7%. This concludes that the experimental load capabilities of the PC-RHA beam and GC-RHA beam were consistent with the ACI design equation.

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Section: Compressive Strength and Optimum MIX Proportionsupporting

confidence: 93%

Comparative Experimental Study of Sustainable Reinforced Portland Cement Concrete and Geopolymer Concrete Beams Using Rice Husk Ash

et al. 2022

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“…Based on results of investigators, the workability of RHA, measured from both the slump and compacting factor tests, decreased with an increase in the share of the RHA [29,34,53,[66][67][68][69][70]. The most likely explanation is that RHA is a porous material with macro and mesopores inside and on the surface of the particles, resulting in a very large specific surface area, which absorbs a certain amount of mixing water on its surface, resulting in a decrease in free water and a lower slump [26,29,34,61,69,70]. Hence, to achieve the required workability, RHA containing mixes require more water, and this demand increases as the RHA percentage of the mix increases.…”

Section: Workabilitymentioning

confidence: 99%

Rice Husk Ash in Concrete

Endale

Taffese

et al. 2022

Sustainability

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This study conducted an extensive literature review on rice husk ash (RHA), with a focus on its particle properties and their effects on the fresh, mechanical, and durability properties of concrete when used as a partial cement replacement. The pozzolanic property of RHA is determined by its amorphous silica content, specific surface area, and particle fineness, which can be improved by using controlled combustion and grinding for use in concrete. RHA particle microstructures are typically irregular in shape, with porous structures on the surface, non-uniform in dispersion, and discrete throughout. Because RHA has a finer particle size than cement, the RHA blended cement concrete performs well in terms of fresh properties (workability, consistency, and setting time). Due to the involvement of amorphous silica reactions, the mechanical properties (compressive, tensile, and flexural strength) of RHA-containing concrete increase with increasing RHA content up to a certain optimum level. Furthermore, the use of RHA improved the durability properties of concrete (water absorption, chloride resistance, corrosion resistance, and sulphate resistance). RHA has the potential to replace cement by up to 10% to 20% without compromising the concrete performance due to its high pozzolanic properties. The use of RHA as a partial cement replacement in concrete can thus provide additional environmental benefits, such as resource conservation and agricultural waste management, while also contributing to a circular economy in the construction industry.

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“…The main cause for pollutant release is contact with rainwater, which provokes leaching [20]. Although the mechanical performance of concrete containing waste has been studied [21], few studies have evaluated its environmental impact.…”

Section: Highlightsmentioning

confidence: 99%

Leaching of Pervious Concrete Produced Using Mixed Recycled Aggregates

Mikami

Kummer

Döll

2020

Braz. arch. biol. technol.

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Mechanical Behavior of Concrete Modified by Replacement of Cement by Rice Husk Ash

Abstract: Construction industry is in need of lump sum quantities of materials which has increased both their demand and

Cited by 12 publications

References 10 publications

Comparative Experimental Study of Sustainable Reinforced Portland Cement Concrete and Geopolymer Concrete Beams Using Rice Husk Ash

Comparative Experimental Study of Sustainable Reinforced Portland Cement Concrete and Geopolymer Concrete Beams Using Rice Husk Ash

Rice Husk Ash in Concrete

Leaching of Pervious Concrete Produced Using Mixed Recycled Aggregates

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