Nanotechnological improvement of structural materials – Impact on material performance and structural design

Schmidt, Manfred; Amrhein, K.; Braun, Tobias; Glotzbach, C.; Kamaruddin, Sameena; Tänzer, Ricarda

doi:10.1016/j.cemconcomp.2012.11.003

Cited by 41 publications

(17 citation statements)

References 2 publications

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“…Due to its considerably fine particle size, nano-silica has been observed to accelerate the hydration process at early ages [23], refine the pore structure [24,25] and enhance the mechanical properties even at small levels of replacement [26]. Moreover, nanosilica also exhibits ideal pozzolanic activity owing to its amorphous nature and high specific surface area [27,28], which leads to the formation of additional C-S-H gel by reacting with calcium hydroxide and results in a denser matrix [29][30][31]. Meanwhile, attention has also been paid to apply nano-silica in alkali activated systems.…”

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confidence: 97%

Characterization of alkali activated slag–fly ash blends containing nano-silica

Gao

Brouwers

2015

Construction and Building Materials

173

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confidence: 97%

Characterization of alkali activated slag–fly ash blends containing nano-silica

Gao

Brouwers

2015

Construction and Building Materials

173

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“…For the production of UHPC, the pozzolanic materials (silica fume, ground granulated blast-furnace slag, fly ash) are widely utilized [1][2][3]. Due to its high purity and high specific surface area, the pozzolanic reaction of silica fume is fast and could more effectively promote the strength development of concrete, compared to the other pozzolanic materials [4]. Nevertheless, the new developments of nano-technology guarantee that various forms of nano-sized amorphous silica can be produced, which have higher specific surface areas and activities compared to conventional silica fume [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of nano-silica on the hydration and microstructure development of Ultra-High Performance Concrete (UHPC) with a low binder amount

Spiesz

Brouwers

2014

Construction and Building Materials

474

145

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h i g h l i g h t sA dense skeleton of UHPC can be obtained with a relatively low binder amount. To get the highest mechanical properties, an optimal amount of nano-silica is calculated. The combined effect of SP and nano-silica additions on the hydration of UHPC is analyzed. The mechanism of the microstructure development of UHPC is analyzed. a r t i c l e i n f o t r a c tThis paper presents the effect of nano-silica on the hydration and microstructure development of UltraHigh Performance Concrete (UHPC) with a low binder amount. The design of UHPC is based on the modified Andreasen and Andersen particle packing model. The results reveal that by utilizing this packing model, a dense and homogeneous skeleton of UHPC can be obtained with a relatively low binder amount (about 440 kg/m 3 ). Moreover, due to the high amount of superplasticizer utilized to produce UHPC in this study, the dormant period of the cement hydration is extended. However, due to the nucleation effect of nano-silica, the retardation effect from superplasticizer can be significantly compensated. Additionally, with the addition of nano-silica, the viscosity of UHPC significantly increases, which causes that more air is entrapped in the fresh mixtures and the porosity of the hardened concrete correspondingly increases. In contrary, due to the nucleation effect of nano-silica, the hydration of cement can be promoted and more C-S-H gel can be generated. Hence, it can be concluded that there is an optimal nano-silica amount for the production of UHPC with the lowest porosity, at which the positive effect of the nucleation and the negative influence of the entrapped air can be well balanced.

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“…Therefore, research on the use of nano-sized particles produced from mineral admixtures, mineral additives, and industrial byproducts in cement, cement mortars, and concrete has gained special attention in recent years in order to achieve the substantial advantages associated with the use of nanotechnology in the construction industry [5][6][7][8][9][10][11][12][13][14]. Recent research studies proved that nano-engineering of cement-based materials offer tremendous potential for the development of new cement additives such as novel superplasticizers, nano-particles, and nano reinforcements which can have significant effect in enhancing the mechanical properties and durability of concrete [10].…”

Section: Introductionmentioning

confidence: 99%