Surface treatment of cement-based materials with NanoSiO2

Pengkun Hou; Xin Cheng; Jueshi Qian; Surendra P. Shah

doi:10.5703/1288284315401

Surface treatment of cement-based materials with NanoSiO₂

Pengkun Hou, Xin Cheng, Jueshi Qian, Surendra P. Shah

Civil and Environmental Engineering

Research output: Contribution to conference › Paper › peer-review

Abstract

A dense surface structure of cement-based material is favorable for its resistance to the impacts of environment. In this work, effectiveness and mechanisms of the surface treatment of cement-based materials with nanoSiO ₂ of different states, that is, colloidal nanoSiO₂ (CNS) and the in situ formed nanoSiO₂ gel through the hydrolysis of its precursor of tetraethoxysilane (TEOS), by brushing and soaking techniques, were investigated. Results showed that both CNS and TEOS are capable of reducing the liquid and gaseous transport properties of hardened cement-based materials, although at a different extent. It revealed that the pozzolanic reactivity and the filler effect of nanoSiO₂ are the main causes for the refining of the threshold size and the reduction of volume of the capillary pores, and they finally lead to a linearly reduction of the transport property. From this study, it can be reflected that surface treatment of cement-based materials with nanoSiO₂ would be an optimal alternative of making concrete structure more durable.

Original language	English (US)
Pages	190-197
Number of pages	8
DOIs	https://doi.org/10.5703/1288284315401
State	Published - 2014
Event	4th International Conference on the Durability of Concrete Structures, ICDCS 2014 - West Lafayette, IN, United States Duration: Jul 24 2014 → Jul 26 2014

Other

Other	4th International Conference on the Durability of Concrete Structures, ICDCS 2014
Country/Territory	United States
City	West Lafayette, IN
Period	7/24/14 → 7/26/14

Keywords

CNS
Cement-based materials
Durability
TEOS

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction

Access to Document

10.5703/1288284315401

Cite this

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title = "Surface treatment of cement-based materials with NanoSiO2",

abstract = "A dense surface structure of cement-based material is favorable for its resistance to the impacts of environment. In this work, effectiveness and mechanisms of the surface treatment of cement-based materials with nanoSiO 2 of different states, that is, colloidal nanoSiO2 (CNS) and the in situ formed nanoSiO2 gel through the hydrolysis of its precursor of tetraethoxysilane (TEOS), by brushing and soaking techniques, were investigated. Results showed that both CNS and TEOS are capable of reducing the liquid and gaseous transport properties of hardened cement-based materials, although at a different extent. It revealed that the pozzolanic reactivity and the filler effect of nanoSiO2 are the main causes for the refining of the threshold size and the reduction of volume of the capillary pores, and they finally lead to a linearly reduction of the transport property. From this study, it can be reflected that surface treatment of cement-based materials with nanoSiO2 would be an optimal alternative of making concrete structure more durable.",

keywords = "CNS, Cement-based materials, Durability, TEOS",

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doi = "10.5703/1288284315401",

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T1 - Surface treatment of cement-based materials with NanoSiO2

AU - Hou, Pengkun

AU - Cheng, Xin

AU - Qian, Jueshi

AU - Shah, Surendra P.

PY - 2014

Y1 - 2014

N2 - A dense surface structure of cement-based material is favorable for its resistance to the impacts of environment. In this work, effectiveness and mechanisms of the surface treatment of cement-based materials with nanoSiO 2 of different states, that is, colloidal nanoSiO2 (CNS) and the in situ formed nanoSiO2 gel through the hydrolysis of its precursor of tetraethoxysilane (TEOS), by brushing and soaking techniques, were investigated. Results showed that both CNS and TEOS are capable of reducing the liquid and gaseous transport properties of hardened cement-based materials, although at a different extent. It revealed that the pozzolanic reactivity and the filler effect of nanoSiO2 are the main causes for the refining of the threshold size and the reduction of volume of the capillary pores, and they finally lead to a linearly reduction of the transport property. From this study, it can be reflected that surface treatment of cement-based materials with nanoSiO2 would be an optimal alternative of making concrete structure more durable.

AB - A dense surface structure of cement-based material is favorable for its resistance to the impacts of environment. In this work, effectiveness and mechanisms of the surface treatment of cement-based materials with nanoSiO 2 of different states, that is, colloidal nanoSiO2 (CNS) and the in situ formed nanoSiO2 gel through the hydrolysis of its precursor of tetraethoxysilane (TEOS), by brushing and soaking techniques, were investigated. Results showed that both CNS and TEOS are capable of reducing the liquid and gaseous transport properties of hardened cement-based materials, although at a different extent. It revealed that the pozzolanic reactivity and the filler effect of nanoSiO2 are the main causes for the refining of the threshold size and the reduction of volume of the capillary pores, and they finally lead to a linearly reduction of the transport property. From this study, it can be reflected that surface treatment of cement-based materials with nanoSiO2 would be an optimal alternative of making concrete structure more durable.

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KW - Cement-based materials

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