Carbonation property of hardened binder pastes containing super-pulverized blast-furnace slag

Zhang, Xiong; Wu, Kaiyi; Yan, An

doi:10.1016/s0958-9465(03)00021-0

Cited by 13 publications

(9 citation statements)

References 2 publications

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“…Research conducted by several authors (20,(30)(31)(32)(33) has shown that in these materials CO 2 reacts with the main hydration product, the C-S-H gel, directly, leading to its decalcification and a loss of cohesion in the matrix.The existence of silica-enriched gel and calcium carbonate in the mixes corroborated that premise (33). Some researchers have suggested that this problem could be attenuated by grinding the slag much more finely (34) and enhancing the efficiency of curing systems (air-tight systems with a mean relative humidity of around 90%) (35).…”

Section: Conclusionesmentioning

confidence: 60%

Hormigón alternativo basado en escorias activadas alcalinamente

Rodríguez¹,

Bernal²,

Gutiérrez³

et al. 2008

Mater. construcc.

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RESUMENEl propósito de este artículo es dar a conocer los resultados de la evaluación del comportamiento de mezclas de hormigón producidas a partir de la activación con waterglass (Na 2 SiO 3 ·nH 2 O + NaOH) de una escoria siderúrgica granulada de alto horno colombiana. Las propiedades mecánicas y de durabilidad de los hormigones activados alcalinamente (AAS) se comparan con las correspondientes mezclas de hormigón de cemento Portland (OPC) producidas con igual proporción de ligante. Estas proporciones variaron entre 340 y 512 kg por m 3 de hormigón. Los resultados obtenidos indican que incrementos en la proporción de la escoria contribuye a la mejora de las propiedades evaluadas.Palabras clave: escoria granulada de alto horno, hormigón de escoria activada, durabilidad. INTRODUCCIÓNGrandes volúmenes de residuos sólidos son producidos anualmente por diversos sectores de la industria, convirtiéndose en un problema medio ambiental debido a las dificultades en su almacenamiento y disposición. Es por SUMMARY This article reports the results of related to on the performance of concrete made with waterglass (Na 2 SiO 3 ·nH 2 O + NaOH)-activated Colombian granulated blast furnace slag. The mechanical strength and durability properties this alkali-activated slag concrete (AAS) were compared to the properties of ordinary Portland cement concrete (OPC) with the same proportion of binder, which ranged from 340 to 512 kg per m 3 of concrete. The results indicated that increasing the proportion of slag led to improvements in the properties studied.

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Section: Conclusionesmentioning

confidence: 60%

Hormigón alternativo basado en escorias activadas alcalinamente

Rodríguez¹,

Bernal²,

Gutiérrez³

et al. 2008

Mater. construcc.

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“…These results indicated that pore structures of POA and RHA carbonated pastes were coarser in comparison to that of FA pastes. When Ca͑OH͒ 2 has been depleted, CSH is attacked and silica gel formed resulting in coarser pore systems ͑Neville 1995; Zhang et al 2004͒. Since POA and RHA were very fine and of high SiO 2 content, they were more likely to consume high amount of Ca͑OH͒ 2 compared to FA.…”

Section: Pore-size Distributionmentioning

confidence: 99%

Pore Structure Changes of Blended Cement Pastes Containing Fly Ash, Rice Husk Ash, and Palm Oil Fuel Ash Caused by Carbonation

Chindaprasirt

Rukzon

2009

J. Mater. Civ. Eng.

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In this paper, the effects of carbonation on pore structure of blended pozzolan cement pastes were investigated. Ordinary Portland cement ͑OPC͒ was partially replaced with ground palm oil fuel ash ͑POA͒, ground rice husk ash ͑RHA͒ and classified fine fly ash ͑FA͒. The strength, total porosity, specific surface area, and pore size distribution were tested. In general, incorporation of pozzolans increased the total porosity of blended cement pastes in comparison to that of OPC paste. Carbonation of pastes under 5% CO 2 and 50% relative humidity ͑RH͒ for 28 days resulted in filling of the pore voids and possible attack on calcium silicate hydrate ͑CSH͒ depending on the type of pozzolan used. After carbonation, total porosity decreased and specific surface areas of the blended pozzolan cement pastes reduced indicating the infilling of voids. Pore size distributions of POA and RHA pastes were different to those of FA pastes. Large pores of the POA and RHA pastes were increased indicating coarsening of pores owing to possible attack on CSH. It is possible that POA and RHA were highly reactive and hence their uses resulting in severe carbonation compared to use of FA.

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“…The carbonation resistance of different concrete mixes has been extensively studied (e.g. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]). In particular, based on systematic analysis of data from 213 and 227 studies for FA [26] and GGBS concretes [27], respectively, it was concluded that the carbonation rates of both FA and GGBS concretes are higher than of PC concretes with the same water/ binder (w/b) ratio (although this may not be the case for equal strength mixes).…”

Section: Introductionmentioning

confidence: 99%

Carbonation of loaded RC elements made of different concrete types: Accelerated testing and future predictions

Wang

Val

et al. 2020

Construction and Building Materials

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Carbonation of concrete can lead to corrosion of reinforcing bars. By this reason its prediction is very important, in particular for durability design, e.g. determining the minimum thickness of the concrete cover. Although carbonation of concrete in reinforced concrete (RC) structures is influenced by applied loading, limited research has been carried out in this area, especially for 'green/low carbon' concretes, i.e. mixes containing supplementary cementitious materials such as fly ash (FA) and ground granulated blast-furnace slag (GGBS). This paper reports the influence of structural loading on carbonation of three types of concrete: Portland cement (PC), PC with 30% of FA and PC with 50% of GGBS, with two water/ binder (w/b) ratios (0.40 and 0.55). Test specimens made with these concretes, i.e. 100-mm cubes (unloaded) and RC beams (loaded), were subject to accelerated carbonation (CO2 content of 4%) for a duration of up to 240 days. Results of the tests are presented in this paper along with their analysis, in particular, the evaluation of the carbonation coefficients.The results clearly show a significant influence of loading on carbonation rate. Based on the test results, the estimated effects of loading on carbonation after 50 and 100 years exposure have been calculated. These estimates indicate that the current durability requirements in the Eurocodes may not be adequate for preventing the initiation of carbonation-induced corrosion in tensile zones of RC elements during their design working life.

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Carbonation property of hardened binder pastes containing super-pulverized blast-furnace slag

Cited by 13 publications

References 2 publications

Hormigón alternativo basado en escorias activadas alcalinamente

Hormigón alternativo basado en escorias activadas alcalinamente

Pore Structure Changes of Blended Cement Pastes Containing Fly Ash, Rice Husk Ash, and Palm Oil Fuel Ash Caused by Carbonation

Carbonation of loaded RC elements made of different concrete types: Accelerated testing and future predictions

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