The influence of polymers on the hydration of portland cement phases analyzed by soft X-ray transmission microscopy

Silva, Denise A.; Monteiro, Paulo J.M.

doi:10.1016/j.cemconres.2006.05.010

Cited by 98 publications

(41 citation statements)

References 12 publications

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“…Em termos de microestrutura, a fase polimérica tende a recobrir os grãos não hidratados de cimento, retardando o processo de hidratação parcialmente ou completamente. Em alguns casos, promove maior formação de produtos internos do que produtos externos de C 3 S, além de evitar a formação de cristais de etringita durante o processo inicial de hidratação [5][6][7]. Porém, é bem possível que a maior vantagem desses sistemas seja a redução da porosidade, com conseqüente diminuição dos caminhos livres para propagação de fissuras e aumento da resistência mecânica final [8].…”

Section: Introductionunclassified

Propriedades mecânicas de materiais compósitos à base de cimento Portland e resina epoxi

et al. 2010

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ResumoO estudo de materiais de alto desempenho e multifuncionais, como os compósitos poliméricos cimentícios, tem sido o foco de inúmeras pesquisas na indústria da construção civil. Este trabalho investiga o efeito da combinação de uma fase polimérica termorrígida, uma resina epóxi, com cimento Portland branco estrutural, seguido da avaliação da resistência à compressão e módulo de elasticidade. Este compósito, quando comparado individualmente com as suas matérias-prima originais, promove um aumento da resistência mecânica à compressão, redução da massa específica e, também uma mudança significativa do comportamento mecânico. As mudanças nas propriedades mecânicas estão associadas à hidratação da fase cimentícia na presença da resina, fato comprovado através da análise espectroscópica na região do infravermelho. Palavras-chave: compósito cimentício polimérico, resina epóxi, cimento Portland branco, espectroscopia por infravermelho. AbstractThe study of multi-functional materials of high performance, as the polymeric-cementitious composites, has been the focus of several researches in the industry of the civil engineering. This work investigates the effect of the combination of a thermorigid epoxy phase and the white Portland cement, followed by the evaluation of its compressive strength and modulus of elasticity. This composite, when the phases are individually compared, provides an increase of the compressive strength, a reduction of the density, and a significant change of the mechanical behaviour. The changes in mechanical behaviour are associated with the hydration of cement in the presence of resin, which was evident after infrared spectroscopy analysis.

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Section: Introductionunclassified

Propriedades mecânicas de materiais compósitos à base de cimento Portland e resina epoxi

et al. 2010

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“…The mechanism of methylcellulose adsorption-rather on the hydration products than on the binder constituents-becomes the most important factor affecting the hydration kinetics of cementitious-organic systems in the model investigations with the use of pure clinker phases [6][7][8][9][10]. The observations included in the cited literature show wide spectrum of possible interactions-from reconstruction of layer structure of gel hydrates on the C 3 S surface, through adsorption on the hydrates surface-calcium hydroxide and hydroaluminates (in the latter case without influence on the microstructure of hydration products) up to the agreeably noted practical lack of adsorption on ettringite surface [6,8].…”

Section: Introductionmentioning

confidence: 99%

Microcalorimetric analysis of methylcellulose influence on the hydration process of tricalcium aluminate, alite and their mixture

Pichniarczyk

Malata²

2016

J Therm Anal Calorim

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In the paper, the results of investigation concerning the influence of 0.3% addition of hydroxypropyl methylcellulose (MC) of 40 and 70 Pa s viscosity on the hydration process of main clinker phases C 3 S and C 3 A are presented. The course of hydration is documented using microcalorimetry, and formed phases were identified by XRD. The research indicated that methylcellulose inhibited the hydration process of clinker phases, analysed both, separately and in their mixture. Moreover, it was found that the presence of MC admixture also led to the reduction in calcium sulphate dihydrate reactivity in the system.

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“…The polymeric phase was identified in many location such as in the pores, on the surface of hydration products, at the interfacial transition zone (ITZ) and among fly ash particles. While the polymer film imposes higher ductility and stronger bonding to the surrounding matrix, the formation of EVA polymer film may interfere cement hydration and further reduces the compressive strength of L-ECC (Ohama and Kan 1982;Silva and Monteiro 2006;Gretz and Plank 2011).…”

Section: Compressive Strengthmentioning

confidence: 99%

Latex-modified Engineered Cementitious Composites (L-ECC)

Chen

Yang

Yao

et al. 2014

ACT

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This paper reports the influence of polymer latex on the fresh and the hardened properties of engineered cementitious composites (ECC), a unique strain-hardening cement-based material featuring extreme tensile strain capacity of 3-5%. Ethylene-vinyl acetate (EVA) dispersible polymer powder was employed in the synthesis of latex-modified ECC (L-ECC). The effects of EVA dosage on viscosity, air content, compressive strength, direct tensile stress-strain relation, four point bending behavior, and microstructure of L-ECC were reported. It was found that the addition of EVA increases the viscosity and the air content of fresh mixture. While the compressive and the tensile strength of L-ECC decrease with increasing EVA dosage, the tensile strain capacity and the toughness of the resulting material show significant enhancement. This is attributed to the change of microstructure as evidenced by the SEM images when EVA is used in the mixture.

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The influence of polymers on the hydration of portland cement phases analyzed by soft X-ray transmission microscopy

Cited by 98 publications

References 12 publications

Propriedades mecânicas de materiais compósitos à base de cimento Portland e resina epoxi

Propriedades mecânicas de materiais compósitos à base de cimento Portland e resina epoxi

Microcalorimetric analysis of methylcellulose influence on the hydration process of tricalcium aluminate, alite and their mixture

Latex-modified Engineered Cementitious Composites (L-ECC)

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