Influence of Fly Ash and Its Partial Replacement by Slag on the Leaching Behavior of Blended Cement Pastes

Zuo, Xiao-Bao; Tang, Yu-Juan; Yin, Guang-Ji; Jiang, Kang; He, Shao-Li

doi:10.1061/(asce)mt.1943-5533.0002003

Cited by 15 publications

(8 citation statements)

References 46 publications

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“…Compared with unleached samples, the approximate content of C-S-H gel in the leached sample decreased by 13.2~17.7% by analyzing the content of Amorphous. The C-S-H gel is partially dissolved and becomes a loose porous structure [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

“…The phenolphthalein in the leaching area would not turn pink in Figure 4 , indicating that calcium hydroxide was leached entirely. The average leaching depth

[ 22 ] can be calculated by

, where

is the average leaching depth;

is the radius of the cement sample;

is the area of the sound zone which is unleached zone in Figure 4 ;

is the area of the cement sample.…”

Section: Methodsmentioning

confidence: 99%

“…As a result of the accelerated leaching method of NH 4 NO 3 solution used by Wan et al [ 20 ], they concluded that cement pastes with low w / c are more resistant to leaching. Zuo et al proposed that the SCMs, such as blast furnace slag, increase their leaching resistance [ 22 ] based on an NH 4 Cl solution. In the above studies, the main research methods and factors influencing the Ca-leaching process in cement without AS accelerator/ordinary molded concrete have been summarized.…”

Section: Introductionmentioning

confidence: 99%

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Experiment Study on the Effect of Aluminum Sulfate-Based Alkali-Free Accelerator and the w/c on Cement Hydration and Leaching

Ling

Jie

et al. 2023

Materials

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The alkali-free accelerator based on aluminum sulfate is widely used in shotcrete in tunnels. Long-term Ca-leaching of shotcrete may adversely affect the tunnels in a water-rich mountain. It is necessary to examine further the impact of the AS accelerator and w/c on cement hydration and leaching. In this study, all the cement pastes were cured in the environment with R.H. > 95% and 20 ± 1 °C for 60 days and leached in a running water test with 6 M NH4Cl at 1 cm/s. The hydration kinetics was characterized by isothermal calorimetry. Additionally, the microstructural and mineralogical alterations were characterized by XRD, SEM, MIP, and N2 absorption. The results show that (1) the AS accelerator affected the hydration kinetics of cement by stimulating early hydration and delaying the late silicate hydration, resulting in AS-accelerated cement pastes with rougher pore structure. As a result, the higher the dose of AS accelerator, the faster the cement pastes will leach. (2) Hydration kinetics of the accelerated cement are not affected by the w/c. The AS-accelerated cement pastes with lower w/c have a denser pore structure. So, the reduction in the w/c contributes to leaching resistance.

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Section: Resultsmentioning

confidence: 99%

“…The phenolphthalein in the leaching area would not turn pink in Figure 4 , indicating that calcium hydroxide was leached entirely. The average leaching depth

[ 22 ] can be calculated by

, where

is the average leaching depth;

is the radius of the cement sample;

is the area of the sound zone which is unleached zone in Figure 4 ;

is the area of the cement sample.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experiment Study on the Effect of Aluminum Sulfate-Based Alkali-Free Accelerator and the w/c on Cement Hydration and Leaching

Ling

Jie

et al. 2023

Materials

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“…Also, after a three-year river experience, the higher remaining compressive strengths were recorded for GO-incorporated mortars. (6) The flexural strengths of standard-cured mortars could be improved by the range of 7.78-22.33% with the addition of GO. Besides, the remaining flexural strengths of mortars were less reduced with the addition of GO.…”

Section: Discussionmentioning

confidence: 98%

Use of Graphene Oxide to Improve the Durability and Mechanical Properties of Mortar Immersed in Flowing River for Three Years

et al. 2020

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Nanomaterials have received increased concentration in the field of civil engineering, as their incorporation can effectively modify the mechanical and transport properties of cementitious composites. In this study, to understand the effect of graphene oxide (GO) nanoparticles on the durability and mechanical properties of cementitious composites serving underwater, mortars incorporated with GO were taken for study. To match the real circumstance, all specimens were immersed directly in a flowing river for three years, and their transport properties, mechanical properties and microstructure before, and after, river experience were studied separately. The results showed that the incorporation of GO could reduce both early-age permeation coefficient and later-age chloride migration coefficient of mortar specimens. The average porosities of mortars could be reduced by the range of 3.37–11% with GO incorporation. Moreover, through a novel dual-scan method, GO incorporation was confirmed effective in enhancing both the leaching and cracking resistance. Furthermore, the compressive strengths, flexural strengths and splitting tensile strengths could be improved by the range of 4.37–9.82%, 7.78–22.33%, 8.14–28.73%, respectively with GO incorporation, and the tested mechanical strengths for GO-incorporated mortar after three-year river experience could be retained to a higher extent. Finally, based on durability and mechanical properties, the optimum mix proportion of GO was determined to be 0.06 wt.% in this study. The work presented here is of high reference value for the designing of marine infrastructure and can help promote the application of nanomaterials in civil engineering.

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“…[13][14][15] However, the Cl content of the leached residue of y ash is still 1-4%, even aer multistep water leaching, due to the presence of water-insoluble Cl in y ash. 16 In this context, the additional fraction of y ash should not be higher than 0.5-2.1% of the raw materials entering the cement kiln (according to the Chinese standard HJ662-2013). Considering the current issue of cement overcapacity, it would be difficult to recycle a large amount of y ash.…”

Section: Introductionmentioning

confidence: 99%

Dechlorination of fly ash by hydrolysate of municipal solid waste leachate

Gao

Wang

et al. 2020

RSC Adv.

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Influence of Fly Ash and Its Partial Replacement by Slag on the Leaching Behavior of Blended Cement Pastes

Cited by 15 publications

References 46 publications

Experiment Study on the Effect of Aluminum Sulfate-Based Alkali-Free Accelerator and the w/c on Cement Hydration and Leaching

Experiment Study on the Effect of Aluminum Sulfate-Based Alkali-Free Accelerator and the w/c on Cement Hydration and Leaching

Use of Graphene Oxide to Improve the Durability and Mechanical Properties of Mortar Immersed in Flowing River for Three Years

Dechlorination of fly ash by hydrolysate of municipal solid waste leachate

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