Microstructure of cement pastes with residual rice husk ash of low amorphous silica content

Rêgo, João Henrique da Silva; Nepomuceno, A. A.; Figueiredo, Enio Pazini; Hasparyk, Nicole Pagan

doi:10.1016/j.conbuildmat.2014.12.059

Cited by 69 publications

(34 citation statements)

References 23 publications

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“…Kaolinitic clay from La Unión, Antioquia, and RH from Córdoba, Colombia, were the raw materials used in this study; after mixing them manually, they were subjected to controlled combustion at 670, 700 and 750°C for 2.0, 2.5 and 3.0 h, temperatures and times that fall within ranges found to be acceptable by several authors [5,13,17]. Chemical composition of the kaolinitic clay is shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Pozzolanicity of the material obtained in the simultaneous calcination of biomass and kaolinitic clay

Uchima

Restrepo

Tobón

2015

Construction and Building Materials

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Section: Methodsmentioning

confidence: 99%

Pozzolanicity of the material obtained in the simultaneous calcination of biomass and kaolinitic clay

Uchima

Restrepo

Tobón

2015

Construction and Building Materials

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“…Depending on particle size, silica content, and the degree of crystallinity, these wastes can be used as cements, pozzolanic admixture, or filler [3][4][5]. The most common wastes used in blended cements are blastfurnace slag, fly ash, silica fume, rice husk ash, and sugarcane bagasse ash [6][7][8][9][10]. Published results report that the use of glass particles for the partial replacement of aggregates or cement can result in beneficial or deleterious effects on the performance of cementitious compounds materials [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Durability of Mortar Made with Fine Glass Powdered Particles

Sales¹,

Sales²,

Figueiredo³

et al. 2017

Advances in Materials Science and Engineering

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Different studies investigate the use of waste glass in Portland cement compounds, either as aggregates or as supplementary cementitious materials. Nevertheless, it seems that there is no consensus about the influence of particle color and size on the behavior of the compounds. This study addresses the influence of cement replacement by 10 and 20% of the colorless and amber soda-lime glass particles sized around 9.5 m on the performance of Portland cement mortars. Results revealed that the partial replacement of cement could contribute to the production of durable mortars in relation to the inhibition of the alkali-aggregate reaction. This effect was more marked with 20% replacement using amber glass. Samples containing glass microparticles were more resistant to corrosion, in particular those made of colorless glass. The use of colorless and amber glass microparticles promoted a reduction in wear resistance.

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“…This value is significantly lower than that of fumed silica [28]. It is known that surface area of RHA decreases with increasing combustion temperature during preparation [29]. The surface area decreases to 31.88 m 2 /g when the silica is modified with 3-APTMS.…”

Section: Characterization Of Rha and Activated Rhamentioning

confidence: 80%

Enzymatic Synthesis of Polycaprolactone: Effect of Immobilization Mechanism of CALB on Polycaprolactone Synthesis

Kaptan¹,

Sc²,

Avcıbaşı-Güvenilir³

2018

Journal of Renewable Materials

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Surface-modified rice husk ash was used as an inorganic support material for immobilization of Candida antarctica lipase B. (3-aminopropyl) trimethoxysilane was used for surface modification. Immobilization of CALB was performed via both physical adsorption and cross-linking. PCL synthesis was carried out by using these immobilized enzymes, free enzyme and Novozyme 435 ®. Molecular weight distribution of polymer samples was obtained by gel permeation chromatography (GPC) and chain structures of the polymer samples were observed by hydrogen nuclear magnetic resonance (1 H-NMR). The highest monomer conversion is generally obtained by using cross-linked enzyme, around 90%. PDI values for all polymer samples were approximately 1.5 which can be considered as acceptable. In general cross-linked enzymes were better than physically adsorbed enzymes in terms of average molecular weights. It can be concluded that PCL can be synthesized with these immobilized enzymes with high molecular weight and low PDI values.

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Microstructure of cement pastes with residual rice husk ash of low amorphous silica content

Cited by 69 publications

References 23 publications

Pozzolanicity of the material obtained in the simultaneous calcination of biomass and kaolinitic clay

Pozzolanicity of the material obtained in the simultaneous calcination of biomass and kaolinitic clay

Durability of Mortar Made with Fine Glass Powdered Particles

Enzymatic Synthesis of Polycaprolactone: Effect of Immobilization Mechanism of CALB on Polycaprolactone Synthesis

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