Moisture and ionic transport in concretes containing coarse limestone powder

Cam, Hieu T.; Neithalath, Narayanan

doi:10.1016/j.cemconcomp.2010.04.002

Cited by 30 publications

(14 citation statements)

References 18 publications

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“…erefore, chloride penetration will be accelerated. Furthermore, Neithalath [39][40][41] discovered that water absorption porosity is closely related to connectivity, as portrayed by equation (8). It is obvious that they two are linearly correlated.…”

Section: Influence Of the Most Probable Pore Size On Dmentioning

confidence: 99%

Influence of Pore Structure on Chloride Penetration in Cement Pastes Subject to Wetting-Drying Cycles

Chang

Zuo

et al. 2019

Advances in Materials Science and Engineering

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Copious studies have discovered a phenomenon that a chloride concentration peak appears on the surface of concrete under cyclic drying-wetting environments. In such cases, the chloride diffusion coefficient (D) obtained through directly fitting the standard error function of Fick's second law is no longer accurate. e more reliable D obtained by the method proposed by Andrade is employed in this research to investigate the influence of pore structure on chloride penetration rate of pastes. e results show that both the effective coefficient (D eff ) and the apparent coefficient (D app ) increase with total porosity, the most probable pore size, and water absorption porosity, suggesting that the increase of the three pore structure parameters accelerates chloride penetration rate under cyclic wetting-drying condition. e increase of the three parameters makes more room available and eases the difficulty for salt solution to enter the matrix and thus leads to the augmentation of chloride transporting in matrix.

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Section: Influence Of the Most Probable Pore Size On Dmentioning

confidence: 99%

Influence of Pore Structure on Chloride Penetration in Cement Pastes Subject to Wetting-Drying Cycles

Chang

Zuo

et al. 2019

Advances in Materials Science and Engineering

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“…The concretes containing limestone powder are found to show higher ϕβ values than the corresponding plain concretes of the same w/c ratio. The coarser limestone powder particles result in increasing the interparticle spacing between the cement grains as well as the effective w/c ratio in the system, both of which result in the cement hydration products being less connected, and thereby increase the actual ϕβ values (22). The incorporation of silica fume reduces the ϕβ values considerably when compared to the limestone powder-modified concretes without silica fume because of the pore filling and pozzolanic effects of silica fume.…”

Section: Compressive Strengths Of Limestone-modified Mixturesmentioning

confidence: 99%

Strength and Transport Properties of Concretes Modified with Coarse Limestone Powder to Compensate for Dilution Effects

Neithalath

Cam

2012

Transportation Research Record: Journal of the Transportation R

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The use of a coarse limestone powder (median particle size of approximately 70 μm, five times larger than cement particles) as a cement replacement material results in a dilution effect. The magnitude of strength and transport property reduction is found to be greater than the magnitude of the cement replacement level. In this paper, methodologies to proportion concrete containing 10% to 15% of coarse limestone powder, in which the dilution effect is compensated through a combination of reduction in water-to-powder ratio and addition of 5% of silica fume, are discussed. Limestone–silica fume blended concretes at a reduced water-to-powder ratio (0.37 or 0.34, depending on limestone replacement level) show similar or higher 56-day compressive strengths than does the benchmark plain concrete with a water-to-cement ratio of 0.40. The rapid chloride permeability and non–steady state migration values of the modified concretes are evaluated along with their pore structure parameter extracted from electrical impedance data. The impact of water-to-powder reduction and silica fume incorporation is quantified through this pore structure parameter.

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“…Others have found that limestone may actually increase compressive strengths (Sprung and Siebel 1991;Chen et al 2014;Kwan and Chen 2012;Camiletti et al 2014). While some authors have reported a reduction in compressive strength, others reported strength as result of substituting cement with limestone (Yu et al 2014;Cam and Neithalath 2010;Skaropoulou et al2012). Although the later effect was generally observed at addition levels in excess of 15% (Tsivilis et al 2003;Meddah et al 2014;BurgosMontes et al 2013;Kakali et al 2002).…”

Section: Literature Reviewmentioning

confidence: 99%

Decision-making on Increasing Limestone Content of General Purpose Cement

Mohammadi

South

2015

ACT

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Journal of Advanced AbstractFollowing the publication of the Australian Standard AS 3972, "General purpose and blended (GP) cements" in 2010, a research programme was undertaken to determine the effect, if any, of increasing the maximum permissible mineral addition in Type GP cement. This paper involves the assessment of the variation in standard laboratory concrete properties due to increasing the limestone addition in cement. Workability, bleed water, compressive strength and drying shrinkage of concrete samples with different limestone contents in the range of 5% to 12% were examined. Based on the research results, it is recommended that the maximum allowable mineral addition in Type GP cement be increased from 7.5% to 12%.

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Moisture and ionic transport in concretes containing coarse limestone powder

Cited by 30 publications

References 18 publications

Influence of Pore Structure on Chloride Penetration in Cement Pastes Subject to Wetting-Drying Cycles

Influence of Pore Structure on Chloride Penetration in Cement Pastes Subject to Wetting-Drying Cycles

Strength and Transport Properties of Concretes Modified with Coarse Limestone Powder to Compensate for Dilution Effects

Decision-making on Increasing Limestone Content of General Purpose Cement

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