Characteristics of Ordinary Portland Cement Using the New Colloidal Nano-Silica Mixing Method

Kim, Tae‐Wan; Hong, Sung-Jong; Seo, Ki-Young; Kang, Changwoo

doi:10.3390/app9204358

Cited by 11 publications

(4 citation statements)

References 60 publications

(163 reference statements)

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“…be distinguished within this range; according to the literature, the one in the range of 120-300 о C corresponds to the dehydration of hydrates such as C-S-H and ettringite, thus giving a general indication of the C-S-H volume. The second peak, between 400-500 о C, is attributable to the de-hydration of CH (calcium hydroxide) [20,21]. It can be clearly seen, that specimens containing NS exhibited a higher mass loss in the first temperature range, thus confirming that more C-S-H was produced in the NS-modified specimen.…”

Section: Fig 2 Comparison Of 28 and 365 Days Compressive Strength Omentioning

confidence: 72%

The microstructural and thermal characteristics of silica nanoparticle-modified cement mortars after exposure to high temperatures. Part I

Sikora¹

2020

Nanobuild

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This study presents an investigation of the effects of high temperature on the thermal and microstructural properties of cement mortars modified with nanosilica. In the first stage of the research, the effects of nanosilica (NS) and silica fume (SF) on the hydration and compressive strength of cementitious composites were compared. In the second stage, four different types of cement mortars, containing an optimal dosage of NS, were produced. Two of them contained a normal weight aggregate (quartz or limestone), whilst two contained a heavy weight aggregate (barite or magnetite). Specimens without NS were produced for control purposes. The specimens were exposed to 300, 450, 600 and 800°C, with their post-heating properties-including thermal conductivity, specific heat, solvent absorption and cracking behavior-analyzed. The results show that NS exhibits significantly higher reactivity with cement than SF. NS accelerates the cement hydration process and contributes more significantly to the 28 and 365 day compressive strength of mortar, as compared to SF. The incorporation of NS in a composite substantially decreases the amount of CH in the mixture and leads to the production of additional C-S-H gel phase, which improves microstructure. The study also shows that NS contributes to a decrement in the thermal conductivity and density of mortar, both prior to and after heating. The incorporation of NS has a beneficial effect on decreasing the deterioration rate of mortars after heating, by decreasing absorption rate and the amount of cracks in in them.

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Section: Fig 2 Comparison Of 28 and 365 Days Compressive Strength Omentioning

confidence: 72%

The microstructural and thermal characteristics of silica nanoparticle-modified cement mortars after exposure to high temperatures. Part I

Sikora¹

2020

Nanobuild

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“…This research served as one of the first studies to discuss the potential internal curing effect of CNS in the concrete and compared it with traditional internal curing aggregate. Most of the research conducted the CNS investigation with the additional ratio of higher than 1% [5,14,[19][20][21][22][23][24][25][26][27][28][29][30][31] , while the cost and practical applicability remain concerns. In order to consider the economic and practical feasibility, relatively small dosage of CNS in concrete was discussed with the additional ratio of 0% (as a reference) to 1%.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Internal Curing Efficacy of Portland Cement Concrete incorporated with Colloidal Nano Silica

Huang¹,

Su²,

Tokpatayeva³

et al. 2022

ES Mater. Manuf.

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This study was conducted to investigate the internal curing effect of the colloidal nano silica (CNS) in concrete. Various dosages of the CNS at 0%, 0.3%, 0.6%, and 1.0% were designed to be incorporated in concrete, mortar, and cement paste for discussion. The internal humidity of prepared concrete was monitored; a concrete mix with the lightweight aggregate (conventional internal curing agent) was also prepared for comparison. The drying shrinkage of the mortar samples was tested to verify the effectiveness of the internal curing. Sorptivity analysis was then carried out to investigate the influence of the CNS on the pore structure of the concrete. Afterward, the water retention properties of the mixtures were evaluated to study the internal curing mechanism of the CNS. To further evaluate the effect of the CNS on hydration, isothermal calorimetry (IC), thermal gravimetric analysis (TGA), and a scanning electron microscope were used. The result of this study reveals that CNS possesses the internal curing effect, which could improve the curing quality and hydration of the cement. Compared to conventional internal curing aggregates, CNS as an internal curing agent not only improves the curing quality, but also requires less storage space and a more straightforward mixing procedure.

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“…Nano silica can improve the cement microstructure of the interfacial transition zone and increase the density of micro pores [31][32][33]. The resulting cement has higher strength, better durability, and improved mechanical properties [34,35]. Nano clay can enhance chloride penetration resistance in ultra-high-performance concrete [36].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Nano-SiO2 and Waterproofing Agent on the Water Transportation Process in Mortar Using NMR

et al. 2020

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Moisture diffusion in cement-based materials significantly impacts its durability. In this study, we analyzed the effect of adding a waterproofing agent and nano-SiO2 (NS) on the water transportation process in mortar using capillary water absorption tests and nuclear magnetic resonance (NMR) technology. The results indicate that the combined action of the waterproofing agent and nano-SiO2 drastically reduce the capillary water absorption coefficient and have a more significant impact than only adding the waterproofing agent. The moisture diffusion in different sections of the mortar during the water absorption process is obtained from the NMR test results and two function models. Comparative studies indicate that the NMR test results have good correlation with the capillary water absorption test results and provide accurate process data. The NMR analysis results offer a new analytical method to characterize the porosity of cement-based materials by continuously monitoring small-pitch sections.

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Characteristics of Ordinary Portland Cement Using the New Colloidal Nano-Silica Mixing Method

Cited by 11 publications

References 60 publications

The microstructural and thermal characteristics of silica nanoparticle-modified cement mortars after exposure to high temperatures. Part I

The microstructural and thermal characteristics of silica nanoparticle-modified cement mortars after exposure to high temperatures. Part I

Investigation of Internal Curing Efficacy of Portland Cement Concrete incorporated with Colloidal Nano Silica

Analysis of the Effect of Nano-SiO2 and Waterproofing Agent on the Water Transportation Process in Mortar Using NMR

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