Modelling of nano-silica in cement paste

Rupasinghe, Madhuwanthi; Mendis, Priyan; Sofi, Massoud; Ngo, Tuan

doi:10.1117/12.2028056

Cited by 5 publications

(2 citation statements)

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“…2 a) allows to conclude that a certain amount of portlandite was binded by the reactive colloidal silica in the composition of a complex binder. Similar dependences of the variation of the portlandite concentration in binding systems with active silica are given, in particular, by the authors of [8]. However, this ratio of the concentrations of portlandite in the hardened composite binder may occur in the case of slowdown of hydration, particularly tricalcium silicate, when included in the cement system a colloidal silica -a (weak) acid component.…”

Section: Resultssupporting

confidence: 69%

The Structure Formation of the Cellular Concrete with Nanostructured Modifier

NELYUBOVA

Строкова

Sumin

et al. 2017

KEM

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In this work the peculiarities of phase formation of the cement stone at presence of nanostructured modifier of the silica composition were identified using the method of x-ray diffraction and raster electronic microscopy. Also the character of influence of modifier on the structure formation of the cement stone was defined. Polydisperse modifier with the presence of a highly active colloidal component, on the one hand, acts as a pozzolanic component, and on the other hand – as a submicron filler.

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Section: Resultssupporting

confidence: 69%

The Structure Formation of the Cellular Concrete with Nanostructured Modifier

NELYUBOVA

Строкова

Sumin

et al. 2017

KEM

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“…The presence of pores and micro cracks facilitates its deterioration in the presence of aggressive agents (sulphates, alkalis, CO 2 gases, chlorine ... etc) As a result, the densification of the cement matrix becomes the aim of much research. This densification is improved by introducing pozzolanic SCMs such as fly ash, silica fume, natural pozzolan, metakaolin, rice husk ash (RHA), glass powder and other minerals [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Use of Algerian Natural Mineral Deposit as Supplementary Cementitious Materials

Arroudj

Dorbani

Oudjit

et al. 2018

JERA

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Much of the current research on concrete engineering has been focused on including siliceous additions as supplementary cementitious materials (SCMs). Silica reacts with Calcium hydroxide release during cement hydration, and produces more C-S-H. The latter contributes to increase compactness, mechanical strengths and sustainability of concrete. This paper explores the hydration characteristics of cement paste based on various natural mineral additions, that are very abundant in Algeria and present a high silica content (ground natural pozzolana “PZ” and ground dune sand “DS”). For this purpose, several analyses were carried out on modified cement pastes and mortars. TheseSCMswere introduced by replacement levels of 15, 20 and 25 by weight of cement. We first, studied the effect of these SCMs on the heat of hydration and mechanical strength of mortars at different ages. The evolution of hydration of modified paste was studied, by using Thermal analysis (TG/TDA) at different ages, to analyze the Calcium Hydroxide (CH) content of the modified pastes. It is shown that the CH content of the mixes including SCMs is lower than that of the plain cement paste, indicating that silica reacts with the cement paste through a pozzolanic reaction. Increased pozzolanic activity results in higher amounts of Calcium Silicate Hydrate in the paste, which in turn results in higher compressive strength for modified cement mortars. Due to its crystalline morphology, the ground DS particles present a partial pozzolanic effect, compared to PZ which is semi-crystalline. Modified mortars by 20% DS can be the optimal composition. It presents satisfactory results: good mechanical strength and low heat of hydration. It can lead to an economic and sustainable concrete. Ground DS is very abounded in Africa and free of any impurities and can be a good alternativeSCMsin cement industry.

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Physico-chemical properties of nano metakaolin on the characteristics of blended limestone cement

Ragab¹

2019

J Build Rehabil

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Modelling of nano-silica in cement paste

Cited by 5 publications

References 0 publications

The Structure Formation of the Cellular Concrete with Nanostructured Modifier

The Structure Formation of the Cellular Concrete with Nanostructured Modifier

Use of Algerian Natural Mineral Deposit as Supplementary Cementitious Materials

Physico-chemical properties of nano metakaolin on the characteristics of blended limestone cement

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