Influence of Organic Esters on Portland Cement Hydration and Hardening

Li, Duanle; Zheng, Dapeng; Wang, Dongmin; Zhao, Jihui; Cheng, Di; Ren, Caifu

doi:10.1155/2018/3203952

Cited by 3 publications

(5 citation statements)

References 11 publications

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“…The resulting increases in compressive strengths because of the interaction between the DEG and the boron compounds are similar to the results of Duan-le and others There is an increase in strength results of 2, 7 and 28 days after the formation of possible borate esters [16]. In other studies, DEG was used as a grinding aid with a dosage of 0.1%, which resulted in a lower 28 days compressive strength compared to reference cement [13] [14].…”

Section: Resultssupporting

confidence: 86%

“…The use of boron compounds led to an increase in the performance of DEG as a grinding aid. The possible reason for this can be that the formed borate esters increase the degree of hydration, to trigger the formation of the hydration products and the optimization of the pore structure as shown in the Duan-le study, [16]. It means a significant increase in early ages (2 and 7 days) and 28 days compressive strength regarding mechanical properties.…”

Section: Resultsmentioning

confidence: 95%

“…PCE reacted like low molecular weight compounds in cement grinding and subsequent hydration reactions. Duan-le and others investigated the effects of organic compounds containing ester groups on cement hydration and hardening [16]. Five different ester group organic compounds (ethyl acetate, dimethyl oxalate, glyceryl triacetate, trimethyl phosphate and triethanolamine borate) were used.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Adding Boron Compounds to Glycol Based Grinding Aids on Cement Compressive Strengths Performance

Çallı¹,

Pehlivan²

2019

OJCE

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In this study, the effect of substituting boron compounds with glycol-based grinding aids to the compressive strength performances of cement was investigated. Monoethylene glycol (MEG) and diethylene glycol (DEG) were used as glycol-based grinding aids, and anhydrous borax and boric acid were used as boron compounds in the tests. CEM I type cement production was carried out with the addition of grinding aid mixtures to Portland clinker and some gypsum in the experiments. All produced cement samples were tested for Blaine fineness, xrf elemental analysis and 2, 7 and 28 days compressive strength tests. Test results of grinding aids of MEG and boron compounds mixture showed no increase in any age of compressive strengths performances related to MEG used itself. However, with the addition of boron compounds to DEG increased grinding aid performance at all ages (2, 7 and 28 days). Possible reasons for this increase could be borate esters formed with DEG and boric acid in a basic medium.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Adding Boron Compounds to Glycol Based Grinding Aids on Cement Compressive Strengths Performance

Çallı¹,

Pehlivan²

2019

OJCE

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“…It is wellrecognized that the interaction between cement and admixtures is a surface phenomenon. Chemical interactions between the cementitious phase and acetates were explained elsewhere [11][12][13]. When the acetate admixture molecules CaA are dispersed in the alkaline medium which is a Ca (OH)2-saturated pore solution of cement pastes, the CaA undergoes hydrolysis resulting in releasing acetate anion CH3COOwhich combines with Ca 2+ released from the dissolution of cement grains.…”

Section: Resultsmentioning

confidence: 99%

New concrete composites incorporated with calcium acetate as admixture: The Impact of Curing Age on Strength and the Effect of Temperature on Water Absorption

Abed¹,

Mojtahedi²,

Lotfollahi-Yaghin³

2023

E3S Web of Conf.

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In previous work, concrete mixes incorporated with different types of acetates (inorganic and organic) were formulated, cured for 28 days in water, and then tested for compressive strength. The effect of the water-to-cement ratio and the acetate content was optimized using a central composited design based on the response surface methodology approach. The results confirmed that the optimum compressive strength was achieved for the mixes incorporated with calcium acetate (CaA) using of 0.48 water-to-cement ratio. In the current work, the effect of curing age on compressive strength and density was studied for the optimum mixes. Also, the water absorption of the mixes carried out by immersion test was assessed at different temperatures (25-55 °C). Microscopic observations were also noted. The results obtained confirmed that the compressive strength and density of the CaA-concrete mix increase with increasing the curing age. The thermodynamic study of water absorption assured the dependence of water absorption on temperature. The activation energies depicted from the Arrhenius relation and the decrease in the water absorption rate for the concrete incorporated with CaA are considered as an indicator of decreasing the porosity of the concrete mixes compared to the control mixes without CaA. The findings assured that the modified mixes with CaA are promising construction materials owing to their outstanding strength and lower water absorption rates compared to conventional concrete.

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“…As amostras consistiam de fragmentos de concreto retirados dos corpos de provas submetidos ao ensaio de compressão axial. As amostras foram tratadas com álcool etílico absoluto para paralisação das reações de hidratação [62]. Posteriormente foram metalizadas com uma fina camada de ouro (20 nm por 2 minutos), que atuou como meio condutor de elétrons.…”

Section: Análises Microestruturaisunclassified

Concreto de cimento Portland dopado com quitosana: propriedades mecânicas e microestrutural

Silva

et al. 2023

Matéria (Rio J.)

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RESUMO A construção civil exerce função importante no consumo de energia em todo o mundo e influência, de forma significativa, o consumo total de recursos naturais e as emissões de CO2. A utilização de materiais renováveis está intrinsecamente relacionada à pesquisa e à inovação. A reutilização, a reciclagem, bem como o desenvolvimento de novos materiais e a descoberta de novas aplicações para materiais renováveis já conhecidos, podem contribuir de maneira expressiva para o desenvolvimento sustentável. A quitosana (CS) é um biopolímero com uma estrutura química e características únicas aliadas à sua farta disponibilidade como derivado da quitina, fazem com que suas possibilidades de aplicação nos mais diferentes campos tecnológicos, tenha se expandido consideravelmente. No presente trabalho, a utilização da quitosana para produção de concretos por meio de teores ótimos é investigada. Os valores de quitosana incorporados na dosagem foram 0,1%; 0,3% e 0,4%, com relação à massa de cimento. Os diferentes concretos obtidos foram submetidos a ensaios de propriedades mecânicas e microestrutural. Os resultados mostraram que a microestrutura foi favorecida com a utilização da quitosana. Bem como, apresentaram resultados favoráveis à incorporação dos teores utilizados de quitosana (se desatacando as amostras com 0,1% de substituição), sendo positivos quanto às propriedades mecânicas para a maioria das técnicas utilizadas, o que indica fortemente que a quitosana pode ser considerada como material promissor a ser incorporado na produção de concreto.

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Influence of Organic Esters on Portland Cement Hydration and Hardening

Cited by 3 publications

References 11 publications

Effects of Adding Boron Compounds to Glycol Based Grinding Aids on Cement Compressive Strengths Performance

Effects of Adding Boron Compounds to Glycol Based Grinding Aids on Cement Compressive Strengths Performance

New concrete composites incorporated with calcium acetate as admixture: The Impact of Curing Age on Strength and the Effect of Temperature on Water Absorption

Concreto de cimento Portland dopado com quitosana: propriedades mecânicas e microestrutural

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