Evolution of the capillary network in a reactive powder concrete during hydration process

Morin, Vincent; Cohen‐Ténoudji, F.; Feylessoufi, A.; Richard, P.

doi:10.1016/s0008-8846(02)00893-1

Cited by 62 publications

(27 citation statements)

References 5 publications

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“…Since then, for perfect physical and mechanical behaviors, RPC has been rapidly boosted in many application fields, e.g. civil engineering, hydraulic engineering, mining engineering, bridge construction and military works [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] . A number of measures have been adopted, such as eliminating coarse aggregates, reducing water-cement ratio, pressing to shape and heating during curing, to improve interfacial property of cement granules and activate…”

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confidence: 99%

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Mesomechanism of steel fiber reinforcement and toughening of reactive powder concrete

Jia

Liu

et al. 2007

Sci. China Ser. E-Technol. Sci.

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Reactive powder concrete (RPC) is a novel cement-based composite material with ultra-high strength. Embedding a certain amount of short steel fibers in the matrixcan improve the RPC's toughness and overcome the disadvantage of high brittleness. In this paper, a number of direct uniaxial tension tests have been carried out with '8-shape' RPC200 specimens. The bond-slip process, mesoscopic structural variation and mechanical characteristics of a fiber pullout of the matrix have been investigated using the real-time SEM loading system and CCD observation techniques. The influence of the volume of embedded short steel fibers in matrix on the mesoscopic morphology of attachments on the surface of a pulled individual fiber, the initial cracking force, the ultimate pullout force, interfacial bond strength and the pullout rupture energy have been analyzed. A general formulation relating these quantities to the volume of fibers in matrix has been proposed. The components comprising the interfacial bond strength have been outlined. In addition, the contribution that fibers make to enhance and toughen the reactive powder concrete has been discussed. It is shown that there exists an optimal threshold of fiber volume ρ v, opt =1.5% at which the bond performance of a fiber pullout of RPC behaves best.reactive powder concrete, steel fiber, interfacial bond strength, reinforcement and toughening, mesomechanism Reactive powder concrete (RPC) is known as a kind of novel cement-based composite with ultrahigh strength and outstanding performance. It was originally initiated by a French company BOUYGUES in 1993. Since then, for perfect physical and mechanical behaviors, RPC has been rapidly boosted in many application fields, e.g. civil engineering, hydraulic engineering, mining engineering, bridge construction and military works [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] . A number of measures have been adopted, such as eliminating coarse aggregates, reducing water-cement ratio, pressing to shape and heating during curing, to improve interfacial property of cement granules and activate

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confidence: 99%

“…Laboratory investigation attention and applications of RPC have nowadays been mainly focused on the following aspects: ① Principle and technique of fabrication [4][5][6][7]10,[13][14][15] , i.e. accumulation theory, raw material selection, mixture design, etc.…”

mentioning

confidence: 99%

Mesomechanism of steel fiber reinforcement and toughening of reactive powder concrete

Jia

Liu

et al. 2007

Sci. China Ser. E-Technol. Sci.

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“…Until the age of 14 days, the number of concrete pores decreases significantly (Fig.9). Pores with 10-20 cm in diameter in the C-S-H cluster are available [23]. These pores are medium capillary pores.…”

Section: Discussionmentioning

confidence: 99%

Cracking of open traffic rigid pavement

et al. 2017

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Abstract. The research is done by observing the growth of real structure cracking in Natar, Lampung, Indonesia compared to C. Niken's et al research and literature study. The rigid pavement was done with open traffic system. There are two main crack types on Natar rigid pavement: cracks cross the road, and cracks spreads on rigid pavement surface. The observation of cracks was analyzed by analyzing material, casting, curing, loading and shrinkage mechanism. The relationship between these analysis and shrinkage mechanism was studied in concrete micro structure. Open traffic make hydration process occur under vibration; therefore, fresh concrete was compressed and tensioned alternately since beginning. High temperature together with compression, cement dissociation, the growth of Ca 2+ at very early age leads abnormal swelling. No prevention from outside water movement leads hydration process occur with limited water which caused spreads fine cracks. Limited water improves shrinkage and plastic phase becomes shorter; therefore, rigid pavement can't accommodate the abnormal swelling and shrinking alternately and creates the spread of cracks. Discontinuing casting the concrete makes both mix under different condition, the first is shrink and the second is swell and creates weak line on the border; so, the cracks appear as cracks across the road.

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“…The microstructure and thus engineering properties of highperformance (DSP) cementitious materials can be improved by steam or high-pressure steam curing, which benefit pozzolanic reactions. Based on a review of the literature on DSP highperformance cementitious materials (Guerrini G.L., 2000;Shannag M.J., et al, 1991;Sun G.K. and Young J.F., 1993;Sun G.-k. and Young J.F., 1993;Beaudoin J.J., et al, 1994;Richard P. and Cheyrezy M., 1995;Cheyrezy M. et al, 1995;Shannag M.J. et al, 1996;Young J.F., 1996;Roux N. et al, 1996;Zanni H., et al,1996;Feylessoufi A. et al,1996;Shannag M.J. et al, 1997;Hu A., et al,1999;Shannag M., et al, 1999;Zivica V., 1999;Matte V. and Moranville M., 1999;Shannag M.J. and Hansen W., 2000;Camilleri J., et al,2001;Moranville-Regourd M., 2001;Collepardi M., et al, 2002;Morin V., et al,2002;Badanoiu A. et al, 2003;Bayard O. and Pie O., 2003;Chan Y.-W. and Chu S.-H., 2004;Washer G. et al, 2004;Lee M.-G. et al, 2007;Wong A.C.L. et al,2007), the cementitious mortar introduced in Table 1 was selected for evaluation of the merits of oxidized carbon nanofibers in cementbased matrices.…”

Section: Cementitious Matrixmentioning

confidence: 99%

Use of Carbon Nano-Fibers in Cementitious Mortar

Awan

Soroushian

Ali

et al. 2017

IJOST

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Cementitious materials, especially those with higher compressive strengths, provide relatively low toughness, tensile strength and strain capacity, and are susceptible to cracking under load and restrained shrinkage effects. These drawbacks were overcome through development of multiscale reinforcement systems comprising carbon nanofibers and microfibers for high-strength cementitious mortars. Multi-scale reinforcement of the high-performance mortar produced significant gains in the flexural strength and toughness, and abrasion and impact resistance. Microstructural investigations were also conducted in order to provide insight into the structure and failure mechanisms of high-performance cementitious mortars with multi-scale reinforcement.

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Evolution of the capillary network in a reactive powder concrete during hydration process

Cited by 62 publications

References 5 publications

Mesomechanism of steel fiber reinforcement and toughening of reactive powder concrete

Mesomechanism of steel fiber reinforcement and toughening of reactive powder concrete

Cracking of open traffic rigid pavement

Use of Carbon Nano-Fibers in Cementitious Mortar

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