Effect of mechanical processing on the pozzolanic efficiency and the microstructure development of wheat straw ash blended cement composites

Qudoos, Abdul; Kim, Hong Gi; Rehman, Atta Ur; Ryou, Jae-Suk

doi:10.1016/j.conbuildmat.2018.10.229

Cited by 69 publications

(24 citation statements)

References 36 publications

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“…After the calcination process, mechanical treatment of WSA significantly increases the fineness and the pozzolanic activity when used as a mineral admixture in mortar and concrete. Qudoos et al [40] studied the effect of different grinding cycles on the pozzolanic efficiency of WSA. They found that the fineness of WSA increased with increasing grinding duration.…”

Section: Introductionmentioning

confidence: 99%

Pozzolanic Potential and Mechanical Performance of Wheat Straw Ash Incorporated Sustainable Concrete

et al. 2019

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The pozzolanic potential, mechanical strength, and stress-strain behavior of a locally available wheat straw ash (WSA) as a partial substitute of cement was evaluated in this study. Various samples of a locally available wheat straw were burnt to ashes at three distinct temperatures and characterized through X-ray powder diffraction and energy dispersive X-ray spectroscopy. The WSA obtained from burning at 550 °C was found highly amorphous and possessed suitable chemical composition to be used as pozzolanic material. The burned WSA was grounded to achieve the desired fineness and mortar cubes and concrete cylinders were cast by substituting 15%, 20%, 25%, and 30% cement with it. The strength of mortar and concrete decreased with increasing amounts of WSA except for those containing 15% WSA, where it slightly increased than the respective control samples at later ages, i.e., 28 and 91 days. Despite reduced strength at high replacements (20%, 25%, and 30%), the strength activity index values met ASTM C618 requirements for pozzolanic materials. Moreover, the compressive strength of concrete containing 20% WSA exceeded to that of control concrete at 91 days. The stress-strain relation of concrete containing 15% to 20% WSA also showed comparable stiffness and toughness to those of control samples at all ages. Particularly, the concrete containing 15% WSA showed significant improvement of strength, stiffness, toughness, and ductility at 91 days. Lastly, the results of mechanical strengths and pozzolanic reactivity were successfully validated indirectly by measuring the porosity of mortars and thermo-gravimetric analysis of cement pastes, respectively. Based on current findings and their validation, WSA can be used as a substitute of cement up to 20% in the production of sustainable normal strength concrete for their application in common domestic building projects.

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Section: Introductionmentioning

confidence: 99%

Pozzolanic Potential and Mechanical Performance of Wheat Straw Ash Incorporated Sustainable Concrete

et al. 2019

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“…The FTIR bands at 3642, 3400-3100, 640 cm −1 are indorsed to O-H stretching of CH, v1 and v2 stretching of the water molecules, v2 bending of the water molecules, respectively. Whereas, the bands at 970 and 870 cm −1 are associated with Si-O stretching of polymeric C-S-H, and v2-stretching of carbonate, respectively [42,50,51]. Apart from this, the doublet bands at 1680 and 1432 cm −1 are liked with the C-O stretching of the CO 3 2− [51].…”

Section: Fourier-transform Infrared Spectroscopymentioning

confidence: 89%

“…This phenomenon indicates decreases in bonded -OH groups and free water [53]. The IR bands around 876, 1432 and 1480 cm −1 specify carbonation in the paste samples [42].…”

Section: Fourier-transform Infrared Spectroscopymentioning

confidence: 90%

“…This demonstrates the degree of ingesting of portlandite due to dilution or pozzolanic effects. The IR bands for a number of specimens emerged at the equivalent locations with varying intensities, which are primarily associated to development of hydration products, like, CH and C-S-H [42]. The wide-ranging bands due to water molecules are positioned at 3450 cm −1 that became smaller and wider with inclusion of PS particles.…”

Section: Fourier-transform Infrared Spectroscopymentioning

confidence: 98%

“…The incorporation of PS particles enhanced the chloride penetration resistance of the specimens. The increased chloride penetration resistance of the specimens containing PS is attributed to microstructure enhancement due to the secondary pozzolanic reaction [42]. In addition, the interfacial transition zone (ITZ) could have become denser than that of the plain sample due to addition of PS and the subsequent pozzolanic reactions.…”

Section: Heat Release Profilesmentioning

confidence: 99%

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Increasing use of cement in the construction industry is causing an alarming increase in carbon dioxide (CO2) emissions, which is a serious environmental threat, it can be reduced by the addition of supplementary cementitious materials (SCMs). The commonly used SCMs like ground granulated blast furnace slag (GGBS), metakaolin (MK) and fly ash (FA) have been successfully used to replace the cement partially or completely. Polysilicon sludge obtained from the photovoltaic industry is also a type of waste material that can be used as SCM because it has high content of reactive SiO2. This study investigates the effects of replacing cement with polysilicon sludge in concrete. Different concrete specimens were made by replacing varying proportions of cement with polysilicon sludge and their properties, such as, fresh properties, compressive strength, heat release, chloride penetration, freeze/thaw resistance and microstructural investigations were determined. The results demonstrate that the polysilicon sludge can be used effectively to replace cement, and environmental threats associated with its disposal can be reduced.

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Effect of mechanical processing on the pozzolanic efficiency and the microstructure development of wheat straw ash blended cement composites

Cited by 69 publications

References 36 publications

Pozzolanic Potential and Mechanical Performance of Wheat Straw Ash Incorporated Sustainable Concrete

Pozzolanic Potential and Mechanical Performance of Wheat Straw Ash Incorporated Sustainable Concrete

Utilization of Waste Polysilicon Sludge in Concrete

Understanding the biochemical changes at molecular level during biomass pretreatment: a comprehensive analysis

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