Hydration behaviour, structure and morphology of hydration phases in advanced cement-based systems containing micro and nanoscale pozzolanic additives

Korpa, Arjan; Kowald, Torsten; Trettin, R.

doi:10.1016/j.cemconres.2008.02.010

Cited by 137 publications

(54 citation statements)

References 11 publications

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“…Compared to the control specimens without Ns (C-S and CG-BP) and irrespective of the type of fibers included, the passing charges of NFRM decreased by up to 45% and 77% for mixtures with, and without, slag, respectively. These results are consistent with the effect of nano-silica on densifying cementitious systems, which effectively contributed to reducing the penetrability of the mixtures through multiple mechanisms (high pozzolanic activity [15][16][17][18][19][20][21], filler effect [19,20,22], and water absorption [20,23]). In addition, the further reduction of passing charges in mixtures CG-Ns-S, CG-Ns-B, and CG-Ns-BP can be ascribed to the synergistic effects of nano-silica and slag, which improved the kinetics of hydration of the binder, even after 14 days of curing, resulting in densification of microstructure and dilution of the pore solution concentration by binding ionic species [17,18].…”

Section: Penetrabilitysupporting

confidence: 73%

Properties of Fiber-Reinforced Mortars Incorporating Nano-Silica

Ghazy

Bassuoni

Maguire³

et al. 2016

Fibers

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Repair and rehabilitation of deteriorating concrete elements are of significant concern in many infrastructural facilities and remain a challenging task. Concerted research efforts are needed to develop repair materials that are sustainable, durable, and cost-effective. Research data show that fiber-reinforced mortars/concretes have superior performance in terms of volume stability and toughness. In addition, it has been recently reported that nano-silica particles can generally improve the mechanical and durability properties of cement-based systems. Thus, there has been a growing interest in the use of nano-modified fiber-reinforced cementitious composites/mortars (NFRM) in repair and rehabilitation applications of concrete structures. The current study investigates various mechanical and durability properties of nano-modified mortar containing different types of fibers (steel, basalt, and hybrid (basalt and polypropylene)), in terms of compressive and flexural strengths, toughness, drying shrinkage, penetrability, and resistance to salt-frost scaling. The results highlight the overall effectiveness of the NFRM owing to the synergistic effects of nano-silica and fibers.

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Section: Penetrabilitysupporting

confidence: 73%

Properties of Fiber-Reinforced Mortars Incorporating Nano-Silica

Ghazy

Bassuoni

Maguire³

et al. 2016

Fibers

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“…Hydration of calcium silicate particles including dicalcium and tricalcium silicate triggers the formation of CH and CSH as hydration byproducts. Formation of CSH enhances the strength of hardened cement 30) . The rate of dicalcium silicate hydration is slower than that of tricalcium silicate in the composition of calcium silicate cements.…”

Section: Resultsmentioning

confidence: 99%

Diametral tensile strength of novel fast-setting calcium silicate cement

et al. 2016

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Novel fast-setting calcium silicate cement with fluoride (CSC) has been developed for potential applications in tooth crown. The aim of this study was to test the diametral tensile strength (DTS) of different CSC compositions in humid condition on day1, 28, and 180. We tested 'bond CSC' with 3.5% fluoride and no radiocontrast, 'CSC' with 3.5% fluoride and 10% radiocontrast, 'ultrafast CSC' with 3.5% fluoride and 20% radiocontrast, 'high fluoride CSC' with 15% fluoride and 25% radiocontrast, Biodentine, and MTA. We filled the cements after mixing to cylindrical molds. Specimens were stored in >95% humidity. DTS was measured at each time point. CSC compositions had statistically higher DTS compared to MTA and Biodentine on day1. Bond CSC showed higher DTS versus all cements, except CSC, at all time points. DTS of all cements, except Biodentine, significantly increased in humid condition on day28 and day180 compared to day1.

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“…SF can improve the properties of cement-based materials, providing increased strength, modulus and ductility [17,18]. Korpa et al [19] found that SF accelerated the early cement hydration phases by providing large amounts of reactive siliceous surface, which serves as a site for early precipitation of hydration products. Kohno et al [20] reported that SF increased the strength of normal cement.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete

Narattha

Thongsanitgarn

Chaipanich

2015

J Therm Anal Calorim

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This paper reports the investigated thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement-fly ash-silica fume concrete. The mixes were cured in water and air for 3, 7 and 28 days. Thermogravimetry results showed that calcium silicate hydrate (C-S-H), ettringite, gehlenite (C 2 ASH 8 ), calcium hydroxide [Ca(OH) 2 ] and calcium carbonate (CaCO 3 ) phases were detected in all mixes. The compressive strength and thermal conductivity of aerated Portland cement-fly ash-silica fume concrete increased when compared with aerated Portland cement-fly ash concrete after 28 days. The compressive strength and thermal conductivity of aerated concrete cured in water had higher values than air-cured specimens. X-ray diffraction and thermogravimetry showed that Ca(OH) 2 decreased with increased silica fume content. This is due to the increased pozzolanic reaction when compared with the Portland cement-fly ash mixes, which corresponds to an increase in compressive strength and thermal conductivity.

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Hydration behaviour, structure and morphology of hydration phases in advanced cement-based systems containing micro and nanoscale pozzolanic additives

Cited by 137 publications

References 11 publications

Properties of Fiber-Reinforced Mortars Incorporating Nano-Silica

Properties of Fiber-Reinforced Mortars Incorporating Nano-Silica

Diametral tensile strength of novel fast-setting calcium silicate cement

Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete

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