Saw Dust Ash Substitution for Cement Pastes-Part I

Darweesh, H. H. M.; El-Suoud, M. R. Abo

doi:10.11648/j.ajasr.20170305.13

Cited by 7 publications

(20 citation statements)

References 20 publications

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“…These materials are not only improving the quality of products of blended cements, but also it reduces the cost and adverse effects of cement production. The fly ash [1][2][3][4][5][6], granulated slag [7,8], silica fume [6,9,10], metakaolin [9,11], sugarcane bagasse ash [12][13][14][15], wheat straw ash [16][17][18][19], corn stalk ash [17][18][19][20][21], rice husk ash [22][23][24][25][26], saw dust ash [27][28][29][30][31][32], palm ash [33], sunflower ash [34], and many others are examples for these materials. The importance of these materials is often due to it possess pozzolanic reactivity from the active amorphous silica which undergoes secondary reactions with the released free lime, Ca(OH)2 from the hydration of the silicate phases of the cement forming additional cementitious materials.…”

Section: Scope Of the Problemmentioning

confidence: 99%

“…Thereafter, about 10 grams of the broken specimens from the determination of compressive strength were first well ground, dried at 105 ºC for 30min. and then were placed in a solution mixture of 1:1 methanol: acetone to stop the hydration [6,10,11,14,25,[32][33][34]39,40]. The kinetics of hydration in terms of chemically bound water and free lime contents were also measured at each hydration age on the basis of ignition loss at 1000 °C for 30 minutes soaking.…”

Section: Rdms000851 15(1)2021mentioning

confidence: 99%

“…This is essentially due to the pozzolanic reactions occurred between the constituents of CPA and the resulting free lime, Ca(OH)2 from the hydration silicate phases of the cement to form CSH [16,19,25,30,34,37]. Furthermore, the deficiency of the cement portion due to the addition of CPA at the expense of the cement led to the decrease of the rate of hydration, which in turn led to the decrease of the released free lime [30][31][32][33][34]37,38].…”

Section: Free Lime Contentmentioning

confidence: 99%

“…On the other side, as the CPA content increased in the cement pastes, the compressive strength increased only up to CP4 containing 12wt % CPA, but then decreased with the further increase of CPA content. The increase of compressive strength is essentially attributed to the pozzolanic reactivity of CPA with the evolved Ca(OH)2 resulting from the hydration silicate phases of the cement [32,34,[41][42][43][44][45][46][47], while the decrease of compressive strength is particularly contributed to the deficiency of the main hydration material of the cement, which in turn decreased the rate of hydration [18,21,30,[48][49][50][51]. In addition, the rate of pozzolanic reactions also decreased.…”

Section: Rdms000851 15(1)2021mentioning

confidence: 99%

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Characterization of Coir Pith Ash Blended Cement Pastes

Hhm

2021

RDMS

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More undesirable wastes or by-products are generated from the coconut and coir industry as coir pith. The raw coir pith was fired up to 500 ºC inside a suitable oven to obtain Coir Pith Ash (CPA). The effect of CPA as a supplementary cementitious material on the various specific characteristics of Portland cement pastes was investigated. Results illustrated that the blaine fineness of the whole cement blend, water of consistency and setting times increased with the increase of CPA addition. The bound water content and bulk density as well as flexural and compressive strengths improved and enhanced with the addition of CPA only up to 12wt % CPA (CP4), and then sharply decreased suddenly with further increase of CPA content (CP5). The free lime content of the blended cement pastes containing different ratios of CPA decreased at all hydration times and were being lower than those of the blank (CP0). The apparent porosity also gradually reduced with cement pastes containing up to 12wt % CPA as in the cement blend CP4, but then increase with further increase of CPA content > 12wt% CPA as in the cement blend CP5. The Ultrasonic Pulse Velosity (USPV) test showed that the matrix conformities of the various hardened cement pastes with CPA are well sticky and good quality.

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Section: Scope Of the Problemmentioning

confidence: 99%

Section: Rdms000851 15(1)2021mentioning

confidence: 99%

Section: Free Lime Contentmentioning

confidence: 99%

Section: Rdms000851 15(1)2021mentioning

confidence: 99%

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Characterization of Coir Pith Ash Blended Cement Pastes

Hhm

2021

RDMS

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“…Generally, the bagasse waste is disposed to the landfills or disposal sites so that it now represents a heavy environmental load. Moreover, the SCB creates an environmental nuisance due to the direct disposal on the open areas so that it can form garbage heaps in these areas [1][2][3][4][5][6][7]. Barroso et al, 2003 [8] stated that one ton from sugarcane could generate 280 kg of bagasse waste.…”

Section: Scope Of the Problemmentioning

confidence: 99%

Extraction of lignin from wastes of sugarcane bagasse and its utilization as an admixture for Portland cement

H.H.M

2021

nanonext

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The influence of the prepared carboxy-methylated lignin extracted from sugarcane bagasse was investigated. Results showed that the w/c ratio and also setting times of the blank (L0) were reduced with the lignin content. The heat of hydration, combined water content, bulk density and compressive strength of the blank (L0) slightly increased with increasing of lignin content, but only up to 0.3 % lignin (L5) and then decreased. The free lime content decreased with the lignin content nearly at all hydration times up to 90 days due to the gradual reduction of the cement portion. The total porosity of the blank (L0) reduced gradually with lignin content up to 0.3 % lignin, and then increased with further increase of lignin. The FTIR spectra illustrated that the rate of hydration increased with lignin content. The SEM-EDAX image analysis showed the improved microstructure of cement pastes in presence of carboxy-methylated lignin when compared with that of the blank.

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Impact of the partial substitution of cement and sand by ash from several types of wood species in cementitious materials manufacture: valorization in the industrial field

Tiegoum Wembe,

Mambou Ngueyep,

Elat

et al. 2024

Discov Civ Eng

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The main objective of this article is to evaluate the potential use of wood ash as a substitute for cement and sand in mortars. Three types of wood were selected: Ayous, Sapelli and Fraké, all of which were sourced from carpentry in Cameroon. The sawdust was dried and combusted to obtain ash, then ground and sieved. Six types of mortar were produced, with cement substitution at 0%, 5%, 10%, 15%, 20% and 25%. The physico-mechanical properties of these substitutions were determined after 7, 28 and 56 days. The results of the cement paste consistency show that it increases with the addition of ash, due to the fact that sawdust ash requires a large quantity of water. The addition of ash caused an increase in setting time due to the fact that sawdust ash is less reactive than Ordinary Portland cement, resulting in a delay in the rate of cement hydration. Apparent density values decreased with the addition of sawdust ash, probably due to the hygroscopic behavior of type of ash in mortar specimens. The highest pozzolanic index is that of 5% replacement by ash and almost identical absorption for all mortars at this substitution percentage. Acid attack results revealed a higher durability of mortar specimens with the higher percentage of ash substitution. Optimum compressive strengths for the different substitution percentages were observed at 5%, 15% and 10% respectively for Ayous, Sapelli and Fraké. The best wood ash is Sapelli because of its chemical composition and resistance to compression in mortars. At 56 days, compressive strength values exceed those of the reference composition. This may be due to pozzolanic reactions in the mortars of ash.

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Saw Dust Ash Substitution for Cement Pastes-Part I

Cited by 7 publications

References 20 publications

Characterization of Coir Pith Ash Blended Cement Pastes

Characterization of Coir Pith Ash Blended Cement Pastes

Extraction of lignin from wastes of sugarcane bagasse and its utilization as an admixture for Portland cement

Impact of the partial substitution of cement and sand by ash from several types of wood species in cementitious materials manufacture: valorization in the industrial field

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