Gradients of microstructure and diffusion properties in cement paste caused by drying

Patel, R.G.; Parrott, Leslie; Martín, Juan A.; Killoh, D.C.

doi:10.1016/0008-8846(85)90046-8

Cited by 40 publications

(7 citation statements)

References 3 publications

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“…It can be seen that the total porosity does not change significantly during CO 2 -fee exposure. Porosity redistribution due to drying without noticeable changes in the total porosity was also reported in the literature [12][13][14][15]. The MIP results after carbonation in 70 % RH show a decrease of the total porosity in comparison to the samples from CO 2 -fee atmosphere.…”

Section: Phase Assemblage Studied By Xrd-rietveldsupporting

confidence: 75%

Changes of microstructure and diffusivity in blended cement pastes exposed to natural carbonation

et al. 2018

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This study compares the phase assemblage and pore structure variation of Portland cement and blended cements, containing limestone and burnt oil shale, during carbonation. Hardened cement paste was exposed to natural carbonation (400 ppm of CO2) at a relative humidity of 70 % for one year. Samples were prepared and cured at 95 % RH for 28 days. Reference mixes were exposed to CO2-free atmosphere to decouple the effect of ongoing hydration and drying from that of carbonation. The phase assemblage was investigated using XRD-Rietveld refinement and thermogravimetric analyses. The porosity and pore structure was assessed based on the results from mercury intrusion porosimetry. Additionally preliminary results of gas diffusion experiment of carbonated and non-carbonated samples are presented.

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Section: Phase Assemblage Studied By Xrd-rietveldsupporting

confidence: 75%

Changes of microstructure and diffusivity in blended cement pastes exposed to natural carbonation

et al. 2018

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“…Based on the earlier studies, the presence of higher contents of calcium hydrates (CH) and calcium silicate hydrates (CSH) compounds with better microstructural properties are responsible for lowering the carbonation depths in SCC in comparison to NVC [36][37][38]. Also, sufficient work has been carried out to investigate the electrical resistivity of NVC and SCC containing NA wherein the electrical resistivity has been tested and probability of corrosion of steel is estimated.…”

Section: Introductionmentioning

confidence: 99%

Carbonation and electrical resistance of self compacting concrete made with recycled concrete aggregates and metakaolin

Singh

2016

Construction and Building Materials

137

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“…7 This can result in rapid chloride penetration. In contrast, an initial period of moist curing followed by rapid drying can lead to cracking of the concrete surface.…”

Section: Introductionmentioning

confidence: 99%

Chloride ion penetration in bridge deck concrete

Ghanem¹,

Phelan²,

Senadheera³

et al. 2006

Proceedings of the Institution of Civil Engineers - Constructio

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During freezing temperatures, ice accumulates on exposed concrete slabs such as bridge decks. De-icing salts such as calcium chloride are applied to control this ice formation. These salts migrate down to the reinforcing steel and they can break down the passivation layer on steel, causing it to corrode. This paper is part of a broader research study, sponsored by the Texas Department of Transportation, to explore the possibility of opening the bridge decks to full traffic following construction/repair earlier than the 10 to 12 days as practised now in Texas. Seven concrete mixtures typically used in Texas bridge decks were evaluated for chloride permeability using the ponding test. The primary experimental variables were the curing duration, type and percentage of supplemental cementitious materials, type of coarse aggregate, duration of ponding, and the surface preparation of ponded concrete specimens. The results of this investigation indicated that chloride permeability decreased with increasing curing duration for the top 1 in (2·5 cm) layer of concrete. It was also observed that curing duration may be decreased for some concrete mixtures, as no apparent improvement was shown after a specific curing duration, which ranged from 2 to 8 days depending on the mix. In addition, increasing the amount of cementitious materials such as fly ash from 20% to 30% considerably reduced the chloride permeability.

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Gradients of microstructure and diffusion properties in cement paste caused by drying

Cited by 40 publications

References 3 publications

Changes of microstructure and diffusivity in blended cement pastes exposed to natural carbonation

Changes of microstructure and diffusivity in blended cement pastes exposed to natural carbonation

Carbonation and electrical resistance of self compacting concrete made with recycled concrete aggregates and metakaolin

Chloride ion penetration in bridge deck concrete

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