Прочность и микроструктура цементного камня c добавками коллоидного SiO2

Translated title of the contribution: Strength and microstructure of colloidal nanosilica enhanced cement pastes

Styliani Papatzani, Kevin Paine, Juliana Holley

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Abstract

The macrolevel properties of concrete; strength and durability are dependent on the hydration of cement. The main products of the chemical reactions of cement clinker with water, are calcium silicate hydrates (C-S-H), calcium aluminate hydrates and calcium hydroxide. C-S-H, the major binding and strengthening factor within the hydrating cement paste, is nanosized. Therefore, it is believed that the addition of nanoparticles can modify the characteristics of the C-S-H in nanoenhanced pastes, inducing subsequent alterations at larger scale phenomena. In this research the addition of nanoparticles of silica, referred to as nanosilica (nS) to blended cement formulations was investigated with the aim of enhancing durability and lowering environmental impact. The hydration products, microstructure and compressive strength of the early and later ages (from 1 day until half a year old) hardened cement paste were compared in a series of cement pastes. The reference paste contained Portland limestone cement and additional limestone (summing up to 60% Portland cement and 40% limestone by mass) and the nS enhanced pastes contained nanosilica at 0.1%, 0.5%, 1% and 1.5% by mass of solids. The water to binder ratio was kept constant at 0.3. The size of nanosilica was confirmed by transmission electron microscopy to be in the order of 8 nm to 50 nm, diameter. Performance evaluation of the pastes, indicated that nS exhibits a pozzolanic behaviour consuming calcium hydroxide to form additional C-S-H. Additionally, for pastes with 40% substitution of cement by limestone, low nS content (0.1% to 0.5%) is favouring strength gain even at later ages. Thermogravimetric analyses and scanning electron microscopy provided a further justification of the above hypothesis. The research reported was part of a much broader research project supported by the EU, and involving industrial and academic partners throughout Europe, to investigate nanotechnology enhanced cements.
Original languageOther
Pages (from-to)80-85
Number of pages6
JournalЦемент и его применение
Volume2014
Issue number4
Publication statusPublished - Oct 2014

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microstructure
cement
calcium
limestone
silicate
durability
hydration
hydroxide
nanotechnology
compressive strength
chemical reaction
transmission electron microscopy
substitution
environmental impact
silica
scanning electron microscopy
water

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@article{38d9abf3abfc42a29d8040ce82e4e01e,
title = "Прочность и микроструктура цементного камня c добавками коллоидного SiO2",
abstract = "The macrolevel properties of concrete; strength and durability are dependent on the hydration of cement. The main products of the chemical reactions of cement clinker with water, are calcium silicate hydrates (C-S-H), calcium aluminate hydrates and calcium hydroxide. C-S-H, the major binding and strengthening factor within the hydrating cement paste, is nanosized. Therefore, it is believed that the addition of nanoparticles can modify the characteristics of the C-S-H in nanoenhanced pastes, inducing subsequent alterations at larger scale phenomena. In this research the addition of nanoparticles of silica, referred to as nanosilica (nS) to blended cement formulations was investigated with the aim of enhancing durability and lowering environmental impact. The hydration products, microstructure and compressive strength of the early and later ages (from 1 day until half a year old) hardened cement paste were compared in a series of cement pastes. The reference paste contained Portland limestone cement and additional limestone (summing up to 60{\%} Portland cement and 40{\%} limestone by mass) and the nS enhanced pastes contained nanosilica at 0.1{\%}, 0.5{\%}, 1{\%} and 1.5{\%} by mass of solids. The water to binder ratio was kept constant at 0.3. The size of nanosilica was confirmed by transmission electron microscopy to be in the order of 8 nm to 50 nm, diameter. Performance evaluation of the pastes, indicated that nS exhibits a pozzolanic behaviour consuming calcium hydroxide to form additional C-S-H. Additionally, for pastes with 40{\%} substitution of cement by limestone, low nS content (0.1{\%} to 0.5{\%}) is favouring strength gain even at later ages. Thermogravimetric analyses and scanning electron microscopy provided a further justification of the above hypothesis. The research reported was part of a much broader research project supported by the EU, and involving industrial and academic partners throughout Europe, to investigate nanotechnology enhanced cements.",
author = "Styliani Papatzani and Kevin Paine and Juliana Holley",
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month = "10",
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pages = "80--85",
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TY - JOUR

T1 - Прочность и микроструктура цементного камня c добавками коллоидного SiO2

AU - Papatzani, Styliani

AU - Paine, Kevin

AU - Holley, Juliana

PY - 2014/10

Y1 - 2014/10

N2 - The macrolevel properties of concrete; strength and durability are dependent on the hydration of cement. The main products of the chemical reactions of cement clinker with water, are calcium silicate hydrates (C-S-H), calcium aluminate hydrates and calcium hydroxide. C-S-H, the major binding and strengthening factor within the hydrating cement paste, is nanosized. Therefore, it is believed that the addition of nanoparticles can modify the characteristics of the C-S-H in nanoenhanced pastes, inducing subsequent alterations at larger scale phenomena. In this research the addition of nanoparticles of silica, referred to as nanosilica (nS) to blended cement formulations was investigated with the aim of enhancing durability and lowering environmental impact. The hydration products, microstructure and compressive strength of the early and later ages (from 1 day until half a year old) hardened cement paste were compared in a series of cement pastes. The reference paste contained Portland limestone cement and additional limestone (summing up to 60% Portland cement and 40% limestone by mass) and the nS enhanced pastes contained nanosilica at 0.1%, 0.5%, 1% and 1.5% by mass of solids. The water to binder ratio was kept constant at 0.3. The size of nanosilica was confirmed by transmission electron microscopy to be in the order of 8 nm to 50 nm, diameter. Performance evaluation of the pastes, indicated that nS exhibits a pozzolanic behaviour consuming calcium hydroxide to form additional C-S-H. Additionally, for pastes with 40% substitution of cement by limestone, low nS content (0.1% to 0.5%) is favouring strength gain even at later ages. Thermogravimetric analyses and scanning electron microscopy provided a further justification of the above hypothesis. The research reported was part of a much broader research project supported by the EU, and involving industrial and academic partners throughout Europe, to investigate nanotechnology enhanced cements.

AB - The macrolevel properties of concrete; strength and durability are dependent on the hydration of cement. The main products of the chemical reactions of cement clinker with water, are calcium silicate hydrates (C-S-H), calcium aluminate hydrates and calcium hydroxide. C-S-H, the major binding and strengthening factor within the hydrating cement paste, is nanosized. Therefore, it is believed that the addition of nanoparticles can modify the characteristics of the C-S-H in nanoenhanced pastes, inducing subsequent alterations at larger scale phenomena. In this research the addition of nanoparticles of silica, referred to as nanosilica (nS) to blended cement formulations was investigated with the aim of enhancing durability and lowering environmental impact. The hydration products, microstructure and compressive strength of the early and later ages (from 1 day until half a year old) hardened cement paste were compared in a series of cement pastes. The reference paste contained Portland limestone cement and additional limestone (summing up to 60% Portland cement and 40% limestone by mass) and the nS enhanced pastes contained nanosilica at 0.1%, 0.5%, 1% and 1.5% by mass of solids. The water to binder ratio was kept constant at 0.3. The size of nanosilica was confirmed by transmission electron microscopy to be in the order of 8 nm to 50 nm, diameter. Performance evaluation of the pastes, indicated that nS exhibits a pozzolanic behaviour consuming calcium hydroxide to form additional C-S-H. Additionally, for pastes with 40% substitution of cement by limestone, low nS content (0.1% to 0.5%) is favouring strength gain even at later ages. Thermogravimetric analyses and scanning electron microscopy provided a further justification of the above hypothesis. The research reported was part of a much broader research project supported by the EU, and involving industrial and academic partners throughout Europe, to investigate nanotechnology enhanced cements.

UR - http://www.jcement.ru/2014_4

M3 - Article

VL - 2014

SP - 80

EP - 85

JO - Цемент и его применение

JF - Цемент и его применение

SN - 1607-8837

IS - 4

ER -