Effect and mechanism of colloidal silica sol on properties and microstructure of the hardened cement-based materials as compared to nano-silica powder with agglomerates in micron-scale

AbstractThe behavior of cement-based materials is manipulated by chemical and physical processes at the nanolevel. Therefore, the application of nanomaterials in civil engineering to develop nano-modified cement-based materials is a promising research. In recent decades, a large number of researchers have tried to improve the properties of cement-based materials by employing various nanomaterials and to characterize the mechanism of nano-strengthening. In this study, the state of the art progress of nano-modified cement-based materials is systematically reviewed and summarized. First, this study reviews the basic properties and dispersion methods of nanomaterials commonly used in cement-based materials, including carbon nanotubes, carbon nanofibers, graphene, graphene oxide, nano-silica, nano-calcium carbonate, nano-calcium silicate hydrate, etc. Then the research progress on nano-engineered cementitious composites is reviewed from the view of accelerating cement hydration, reinforcing mechanical properties, and improving durability. In addition, the market and applications of nanomaterials for cement-based materials are briefly discussed, and the cost is creatively summarized through market survey. Finally, this study also summarizes the existing problems in current research and provides future perspectives accordingly.

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Effects of nano silica on the properties of cement-based materials: A comprehensive review

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.122715 ◽

2021 ◽

Vol 282 ◽

pp. 122715 ◽

Cited By ~ 1

Author(s):

Haibin Yang ◽

Manuel Monasterio ◽

Dapeng Zheng ◽

Hongzhi Cui ◽

Waiching Tang ◽

...

Keyword(s):

Nano Silica ◽

Comprehensive Review ◽

Cement Based Materials

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Influence of Nano-Barium Sulfate Agglomeration on Microstructure and Properties of the Hardened Cement-Based Materials

Journal of Materials Science and Chemical Engineering ◽

10.4236/msce.2015.311009 ◽

2015 ◽

Vol 03 (11) ◽

pp. 72-81

Author(s):

Mohamed El-Shahate Ismaiel Saraya ◽

Inas Mostafa Bakr

Keyword(s):

Barium Sulfate ◽

Hardened Cement ◽

Microstructure And Properties ◽

Cement Based Materials

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Study on the Gel Aging of Nano Silica Sol Produced by a Y-shaped Reactor

e-Journal of Surface Science and Nanotechnology ◽

10.1380/ejssnt.2009.737 ◽

2009 ◽

Vol 7 ◽

pp. 737-740 ◽

Cited By ~ 2

Author(s):

Saori Kikuchi ◽

Takashi Saeki ◽

Kazuaki Tabata ◽

Kohzo Ohta

Keyword(s):

Silica Sol ◽

Nano Silica

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Review of Carbonation Resistance in Hydrated Cement Based Materials

Journal of Chemistry ◽

10.1155/2019/8489671 ◽

2019 ◽

Vol 2019 ◽

pp. 1-6 ◽

Cited By ~ 9

Author(s):

Joseph Mwiti Marangu ◽

Joseph Karanja Thiong’o ◽

Jackson Muthengia Wachira

Keyword(s):

Environmental Benefits ◽

Partial Substitution ◽

Cement Matrix ◽

Hardened Cement ◽

Hydrated Cement ◽

Blended Cements ◽

Carbonation Process ◽

Carbonation Resistance ◽

Cement Based Materials ◽

Process Factors

Blended cements are preferred to Ordinary Portland Cement (OPC) in construction industry due to costs and technological and environmental benefits associated with them. Prevalence of significant quantities of carbon dioxide (CO2) in the atmosphere due to increased industrial emission is deleterious to hydrated cement materials due to carbonation. Recent research has shown that blended cements are more susceptible to degradation due to carbonation than OPC. The ingress of CO2 within the porous mortar matrix is a diffusion controlled process. Subsequent chemical reaction between CO2 and cement hydration products (mostly calcium hydroxide [CH] and calcium silicate hydrate [CSH]) results in degradation of cement based materials. CH offers the buffering capacity against carbonation in hydrated cements. Partial substitution of OPC with pozzolanic materials however decreases the amount of CH in hydrated blended cements. Therefore, low amounts of CH in hydrated blended cements make them more susceptible to degradation as a result of carbonation compared to OPC. The magnitude of carbonation affects the service life of cement based structures significantly. It is therefore apparent that sufficient attention is given to carbonation process in order to ensure resilient cementitious structures. In this paper, an indepth review of the recent advances on carbonation process, factors affecting carbonation resistance, and the effects of carbonation on hardened cement materials have been discussed. In conclusion, carbonation process is influenced by internal and external factors, and it has also been found to have both beneficial and deleterious effects on hardened cement matrix.

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