Effect of Rice Husk Ash Properties on the Early Age and Long Term Strength of Mortar

Rasoul, Binyamien I.; Günzel, Friederike; Rafiq, MI

doi:10.1007/978-3-319-59471-2_26

Cited by 9 publications

(7 citation statements)

References 7 publications

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“…The increase in tensile strength of mortar with RHA containing a high amount of crystalline silica is better justified by the filler effect (physical) than by the pozzolanic effect (chemical). After depletion of all amorphous silica by reacting with calcium hydroxide (Ca(OH) 2 ) to produce secondary C-S-H gel, the remaining crystalline silica behaves as a filler resulting in an increased density of the mortar [73,85]. Like the compressive strength, the reactive silica content, rather than the overall silica content, determines the tensile strength of RHA-containing mortar.…”

Section: Tensile Strengthmentioning

confidence: 99%

“…Like the compressive strength, the reactive silica content, rather than the overall silica content, determines the tensile strength of RHA-containing mortar. The optimal replacement level of cement by RHA depends more on the silica structure and particle size than the overall silica content of RHA [85]. RHA with a high specific surface area has a positive effect on mortar strength.…”

Section: Tensile Strengthmentioning

confidence: 99%

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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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Section: Tensile Strengthmentioning

confidence: 99%

Section: Tensile Strengthmentioning

confidence: 99%

Rice Husk Ash in Concrete

Endale

Taffese

et al. 2022

Sustainability

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“…RH has a high energy content of 16,720 kJ kg −1 , making it suitable for burning fuel or postcombustion [1]. When RH is burned between 350 and 750 °C, an amorphous shape of silica is formed, whereas a crystalline shape is formed when it is burned above 800 °C [2]. The yield of the ash is 25% when RH is burned.…”

Section: ■ Introductionmentioning

confidence: 99%

Integral Membrane Properties of Polysulfone/Chitosan/Polyvinyl Alcohol Blend Incorporated with Rice Husk Ash Silica Gel

Chik

Shaari

2023

Indones. J. Chem.

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In this study, silica gel was extracted from rice husk ash using a modified acid-leaching process. The gel was then characterized using an X-ray Diffractometer (XRD) and an X-ray Fluorescence (XRF). At different loadings of 0, 0.05 and 0.10 wt.%, silica gel was used as a cross-linker in the membrane formulation. Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) were used to characterize the membranes, while their performance was determined by pure water flux. XRD and XRF results revealed that the gel contained 76.85% silica. The presence of silica gel in membranes results in optimal water flux, indicating that the membranes have achieved good integral stability via the cross-linking process. Based on these positive findings, the applications of the membranes in the water-oil separation process will be evaluated in future work.

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“…The production of silica (SiO2) within the amorphous state is preferable because it is more active than crystalline silica, as the amorphous silica has higher mechanical properties and higher quality in the non-distractive test than the crystalline silica (Sldozian, 2014). The amorphous form of silica is obtained when the rice husk is burnt between 350 and 750°C, and the crystalline silica form is obtained when burnt over 800°C (Rasoul et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Extraction of Silica from Rice Husk Ash and Its Effect on the Properties of the Integral Membrane

Chik¹,

Shaari²,

Ramlee³

et al. 2022

ASMScJ

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The large generation of agricultural residue could pose an environmental issue that lies through the disposal problem. Therefore, the incorporation of rice husk ash (RHA) into the membrane formulation could curb this problem besides adding value to the biomass. Rice husk ash is widely used as a filler for a polymer composite to enhance its mechanical properties due to the presence of silica. This research incorporated RHA into the membrane formulation. The silica in the RHA was extracted using an acid-leaching process and dried into silica powder. The silica powder was characterised by using an X-Ray diffractometer (XRD) and X-Ray fluorescence (XRF). A sol-gel method with hydrochloric acid as the catalyst was used in the fabrication of polysulfone/chitosan/polyvinyl alcohol membrane, and the extracted silica powder was incorporated in the formulations. The membranes were characterised in terms of functional groups using Fourier Transform Infrared Spectroscopy (FTIR), surface morphology using Scanning Electron Emission (SEM) analysis, and surface hydrophilicity using contact angle analysis. Finally, the performance of the membrane was analysed by pure water flux and antifouling. The XRD and XRF results showed that the extracted silica powder contained 77% of silica with the absence of impurities. The cross-linking reaction of membranes occurred as the Si–O–C bond was detected at 1,105cm−1 after the FTIR analysis, and a compact structure of the membrane was detected from the SEM analysis. The results from pure water flux portrayed that the membranes incorporated with silica (M1 and M2) had better integral stability compared to that from the pure polymer, which was observed from the consistent value of flux throughout the 1-hour filtration time and no swelling of the membranes after the performance testing. The results also showed that the extraction of silica from the RHA using a modified process was successfully conducted, and the silica powder was also compatible with the membrane solution as no separate layer was formed. Thus, the produced membranes have the potential to be used in the treatment of wastewater containing heavy metal ions.

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Effect of Rice Husk Ash Properties on the Early Age and Long Term Strength of Mortar

Cited by 9 publications

References 7 publications

Rice Husk Ash in Concrete

Rice Husk Ash in Concrete

Integral Membrane Properties of Polysulfone/Chitosan/Polyvinyl Alcohol Blend Incorporated with Rice Husk Ash Silica Gel

Extraction of Silica from Rice Husk Ash and Its Effect on the Properties of the Integral Membrane

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