Utilization of Physalis Pith Ash as a Pozzolanic Material in Portland Cement Pastes

Darweesh, H. H. M.

doi:10.11648/j.jb.20210501.11

Cited by 5 publications

(7 citation statements)

References 21 publications

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“…The standard water consistency (WC) as well as setting time (initial and final) of the various cement pastes were directly determined using Vicat Apparatus [42][43][44][45]. The cement pastes were then cast using the predetermined water of consistency, moulded into one-inch cubic stainless steel moulds (2.5 x 2.5 x 2.5 cm 3 ) using about 500 g cement mix, vibrated manually for three minutes and then on a mechanical vibrator for another three minutes.…”

Section: Preparation and Methodsmentioning

confidence: 99%

“…Thereafter, the moulds were kept in a humidity chamber for 24 hours under 95 ± 1 RH and room temperature, demoulded in the next day and soon immersed in water till the time of testing at 1, 3, 7, 28 and 90 days. The bulk density (BD), total porosity (δ) and the compressive strength (CS) of the various hardened cement pastes [42][43][44][45] were measured.…”

Section: Preparation and Methodsmentioning

confidence: 99%

“…The chemically-bound water content was measured, where bout one gram of the sample was first dried at 105°C for 24h, and then the chemicallybound water content (BWn) at each hydration age was determined on the basis of ignition loss at 1000°C for 30 min. soaking [42][43][44]48].…”

Section: Preparation and Methodsmentioning

confidence: 99%

“…It was completely disappeared with S3 and S4 due to the incorporation of SOP ash. This is mainly attributed to its active pozzolanic effect that initiated and improved the rate of hydration [35,42,43,54,[60][61][62][63][64]. The broad absorption band intensity at wave number 3793-3025 cm -1 which is due to the OH -1 group associated to H + bond (H2O) increased with the incorporation of OSP ash due to the absorption of large quantity of water to form CSH.…”

Section: Ft-ir Spectramentioning

confidence: 99%

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Utilization of Oyster Shell Powder for Hydration and Mechanical Properties Improvement of Portland Cement Pastes

Darweesh¹

2023

JSMPM

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Supplementary cementitious materials (SCMs) are usually partially substituted at the expense of Portland cement (OPC) to reduce, as possible, the CO2emission. There has been limited studies involved the use of Oyster shell (OS) to replace OPC. The current study investigated the properties of a ternary base batch containing Oyster shell powder (OSP).The ternary cement batch was consisting of OPC, granulated blast furnace slag (GbfS) and metakaolin (MK). The results indicated that the water consistency and setting times (initial and final) are gradually increased. The water absorption and total porosity are decreased, while the bulk density and combined water content increased. This behaviour continued up till 16 % OSP content, but then reverse was obtained with any further increase of OSP content. The same trend was achieved with the compressive strength. The addition of OSP often formed mono-and/or hemicarbonate instead of monosulfate because it is mainly composed of carbonates, and moreover it is stabilizing the formation of trisulphate or ettringite in the hydrated samples. The decrease is not the decrease of free lime contents proved that the OSP is a pozzolanic material. This was confirmed by FT-IR spectra. From the results it could be concluded that the optimum content of OSP was at most 16 %.

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Section: Preparation and Methodsmentioning

confidence: 99%

Section: Preparation and Methodsmentioning

confidence: 99%

Section: Preparation and Methodsmentioning

confidence: 99%

Section: Ft-ir Spectramentioning

confidence: 99%

See 2 more Smart Citations

Utilization of Oyster Shell Powder for Hydration and Mechanical Properties Improvement of Portland Cement Pastes

Darweesh¹

2023

JSMPM

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“…The higher percentage of SiO2 and Al2O3 in the material indicates its pozzolanic activity. Pozzolans had undergone thermal reactions [52][53][54][55], which suggested that the high silica content of CSPW had led to the formation of secondary or additional CSHs, i.e. the pozzolanicilty of these additive materials have a common practice for improving the durability, resistivity and mechanical properties [56].…”

Section: Compressive Strengthmentioning

confidence: 99%

Study on Portland Cement Pastes Containing Sanitary Ware Ceramic Wastes at Elevated Temperatures

Darweesh

2023

JSMPM

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Resistance of Portland cement pastes incorporated 20 wt. % sanitary ware ceramic nano-powder wastes to firing temperatures from 100 up to 600 ℃ was investigated. Results revealed that all physical and mechanical properties were improved and gradually enhanced with firing temperatures, but only up to 400 ℃, and then adversely affected with any further increase of firing temperatures than 400 ℃, i.e. water absorption and total porosity decreased, whereas bulk density was enhanced. Water absorption and total porosity were decreased by 10 and 4 %, respectively, while bulk density was increased by 2.25 %. Furthermore, flexural and compressive strengths were also improved and increased by 1.69 and 1.2 %, respectively. Fourier transform infrared spectra (FT-IR) showed the disappearance of free lime and ettringite on firing. Scanning electron microscopy (SEM) showed that the crystal phase growth of the formed hydration products as a result of both normal hydration and pozzolanic reactions at ambient temperature were developed and modified due to the temperature exposure. The hardened cement pastes can withstand and resist only up to 400 ℃.

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Light Weight Clay Bricks in Combination of Sludge Blended with Agro/Wastes

Darweesh¹

2021

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The objective of the study is to produce light weight bricks to use as an isolating layer. So, porous or light weight bricks were prepared from clay, sludge, agro/ashes as Saw dust ash (DSA), sugarcane bagasse ash (SCBA) and corn stalk ash (CSA) fired up to 900°C. Physical and mechanical properties were investigated. The chemical composition of the starting raw materials was carried out by XRF analysis. Results proved that the water absorption (25.51, 25.74 and 25.86%) and apparent porosity (29.31, 29.51 and 29. 68%) were slightly lowered up to 6 wt. % of these waste ashes, and then increased with further increase. The bulk density (1.9989, 1.9987 and 1.9985 g/cm 3 ) and compressive strength (48.54, 48.45 and 48.26 MPa) improved and enhanced with the replacement up to 6 wt. %, and then diminished. So, the optimum ash content was not more than 6 wt. % because the substitution of more than that bad or adverse effect was exhibited. Results also proved that the physical and compressive strength was better in case of SDA > SCBA > CSA. The prepared fired bricks could be successfully used and preferred as isolating bricks against heat.

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Utilization of Physalis Pith Ash as a Pozzolanic Material in Portland Cement Pastes

Cited by 5 publications

References 21 publications

Utilization of Oyster Shell Powder for Hydration and Mechanical Properties Improvement of Portland Cement Pastes

Utilization of Oyster Shell Powder for Hydration and Mechanical Properties Improvement of Portland Cement Pastes

Study on Portland Cement Pastes Containing Sanitary Ware Ceramic Wastes at Elevated Temperatures

Light Weight Clay Bricks in Combination of Sludge Blended with Agro/Wastes

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