High-Volume Fly Ash Concrete with and without Hydrated Lime: Chloride Diffusion Coefficient from Accelerated Test

Filho, Juarez Hoppe; Medeiros, M. H. F.; Pereira, Eduardo; Helène, Paulo; Isaia, Geraldo Cechella

doi:10.1061/(asce)mt.1943-5533.0000596

Cited by 67 publications

(24 citation statements)

References 20 publications

(25 reference statements)

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“…This will also enable us to estimate diffusivity from a small concrete sample or even concrete pieces, which is not possible in diffusivity test. Furthermore, in the penetration test of chloride ion, the effect of heat generated by electrical potential difference was concerned [6], and this effect was verified by estimating the diffusivity from pore structure to validate the accuracy of the experiment.…”

mentioning

confidence: 94%

Relationship between pore structure and chloride diffusion in cementitious materials

Sakai

2019

Construction and Building Materials

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In this study, literature on pore structure and chloride ion diffusivity was collected to investigate the correlation of pore structure indicators with diffusivity. Good correlation between total porosity and chloride ion diffusivity was found when the samples did not contain admixture materials and diffusion test was conducted without acceleration. Pore diameter indicators did not correlate with diffusivity. The diffusivity of cement paste was reduced by admixture materials compared to that without admixture materials even if the total porosity is the same. On the other hand, the diffusivity of concrete was not reduced by admixture materials.

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mentioning

confidence: 94%

Relationship between pore structure and chloride diffusion in cementitious materials

Sakai

2019

Construction and Building Materials

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“…Moreover, they concluded that use of fly ash changed density and amount of calcium hydroxide in concrete were reduced. [18] Homnuttiwong (2012) investigated compressive strength, water permeability and abrasion resistance of high volume fine fly ash and fine ground palm oil fuel ash concrete. They replaced up to 70% Portland cement type I by fine fly ash (FFA) and fine ground palm oil fuel ash (GPA).…”

Section: International Journal For Research In Applied Science and Engimentioning

confidence: 99%

Study on Concrete Using Fly Ash, Rise Husk Ash and Egg Shell Powder

Patel¹

2017

IJRASET

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Approximately, yearly concrete production is about 10 billion cubic meters. Cement is a very important constituent of concrete, and approximately 4180 million tons of cement were produced in 2014 globally. Production of one ton of cement releases approximately one ton of CO2 which makes up 7% of all CO2 emissions produced globally. Hence, there is necessity to use supplementary cementitious materials (SCMs) as partial replacement of cement and sand in concrete. Utilization of SCMs reduces the consumption of Ordinary Portland cement, and thereby reduces the energy consumption and greenhouse gas emissions associated with cement production. In this paper the basic aim is to review the research paper on the use of waste material in concrete.

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“…Hoppe Filho [7] showed that fly ash tends to reduce the alkalinity of the concrete due to calcium hydroxide consumption, which is the main controlling factor of pH in cement pastes. (g) Hoppe Filho et al [8] investigated the use of high contents of fly ash in the concrete mix proportion and also showed great decrease of the chloride diffusion coefficient in concretes with fly ash in their composition. (h) Heede and Belie [9] studied concretes with 15% of the Portland cement replaced by fly ash, using accelerated carbonation test and reinforcement depassivation time.…”

Section: Introductionmentioning

confidence: 99%

Partial replacement and addition of fly ash in Portland cement: influences on carbonation and alkaline reserve

et al. 2017

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This study aims to analyze the effect of using fly ash as a Portland cement additive or partial replacement in service conditions where carbonation acts as a degradation process. Fly ash was typified as anhydrous by XFR, XRD, modified Chapelle tests and laser granulometry. Five concretes were casted: one as reference (without additive), two with fly ash used as cement additive and two with fly ash used as a partial replacement of Portland cement. Replacement or additive levels were between 10 and 30% of cement mass. Those concretes were submitted to the compressive strength, accelerated carbonation and XRD tests using mortar extracted from the concrete in order to measure its alkaline supply. This researched allowed to conclude that alkaline reserve decreases and carbonation speed increases by adding or partially replacing the fly ash in the Portland cement. Besides, using fly ash reduces compressive strength at 28 days after wet cure. It is also important to highlight that there is an inverse correlation between alkaline reserve and carbonation speed in this case and, therefore, the remaining portlandite level is an important control factor in the carbonation process.

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High-Volume Fly Ash Concrete with and without Hydrated Lime: Chloride Diffusion Coefficient from Accelerated Test

Cited by 67 publications

References 20 publications

Relationship between pore structure and chloride diffusion in cementitious materials

Relationship between pore structure and chloride diffusion in cementitious materials

Study on Concrete Using Fly Ash, Rise Husk Ash and Egg Shell Powder

Partial replacement and addition of fly ash in Portland cement: influences on carbonation and alkaline reserve

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