Effects of bentonite on pore structure and permeability of cement mortar

Yang, Hu; Long, Diao; Lai, Zhenyu; He, Yiyong; Yan, Tao; He, Xiuli; Wu, Jie; Lu, Zhongyuan; Lv, Shanshan

doi:10.1016/j.conbuildmat.2019.07.073

Cited by 49 publications

(16 citation statements)

References 44 publications

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“…Surprisingly, very few studies [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ] on the subject were found in the literature other than reports of the widespread joint use of cement and bentonite in underground works [ 28 , 29 ], such as the nuclear waste storage [ 34 , 35 , 36 , 37 , 38 ], soil stabilisation or impermeable slurry wall construction [ 27 ].…”

Section: Discussionmentioning

confidence: 99%

“…A number of studies [ 13 , 14 , 15 ] have recently reported promising results around its application to replace more conventionally used additions such as fly ash or slag. Few studies on its non-precalcined use have been found in the literature, however, for that approach has consistently posed rheological problems [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. That would explain why many building codes limit the presence of clay materials in aggregates and the much more common use of these materials in foundations and soil stabilisation than for structural applications [ 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, today’s admixtures afford fresh concrete properties impossible to attain in the past, and modern laboratory techniques now in place can substantially shorten the time needed to design an optimal mix [ 30 , 31 , 32 , 33 ]. Non-precalcined bentonite has seldom been used to date in lieu of more conventional mineral additions [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. This study was therefore designed to study the hydration mechanisms involved [ 19 , 24 , 26 ], fresh concrete properties such as flowability and bleeding [ 18 , 25 ], bentonite reactivity [ 19 ] and concrete water permeability [ 17 , 20 , 22 ] and compressive strength [ 16 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reduced Carbonation, Sulfate and Chloride Ingress Due to the Substitution of Cement by 10% Non-Precalcined Bentonite

Andrade

Martínez-Serrano

Sanjuán³

et al. 2021

Materials

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The Portland cement industry is presently deemed to account for around 7.4% of the carbon dioxide emitted annually worldwide. Clinker production is being reduced worldwide in response to the need to drastically lower greenhouse gas emissions. The trend began in the nineteen seventies with the advent of mineral additions to replace clinker. Blast furnace slag and fly ash, industrial by-products that were being stockpiled in waste heaps at the time, have not commonly been included in cements. Supply of these additions is no longer guaranteed, however, due to restrained activity in the source industries for the same reasons as in clinker production. The search is consequently on for other additions that may lower pollutant gas emissions without altering cement performance. In this study, bentonite, a very common clay, was used as such an addition directly, with no need for precalcination, a still novel approach that has been scantly explored to date for reinforced structural concrete with structural applications. The results of the mechanical strength and chemical resistance (to sulfates, carbonation and chlorides) tests conducted are promising. The carbonation findings proved to be of particular interest, for that is the area where cement with mineral additions tends to be least effective. In the bentonite-bearing material analysed here, however, carbonation resistance was found to be as low as or lower than that observed in plain Portland cement.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reduced Carbonation, Sulfate and Chloride Ingress Due to the Substitution of Cement by 10% Non-Precalcined Bentonite

Andrade

Martínez-Serrano

Sanjuán³

et al. 2021

Materials

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“…Surprisingly. very few studies [10][11][12][13][14][15][16][17][18][19][20] on the subject were found in the literature other than reports of the widespread joint use of cement and bentonite in underground works [22][23]. such as the nuclear waste storage [28][29][30][31][32].…”

Section: Discussionmentioning

confidence: 99%

“…A number of studies [7][8][9] have recently reported promising results around its application to replace more conventionally used additions such as fly ash or slag. Few studies on its non-pre-calcined use have been found in the literature [10][11][12][13][14][15][16][17][18][19][20]. Its use in foundations and for stabilizing the soil [21][22][23] however is much more common, although for that approach has consistently posed rheological problems.…”

Section: Introductionmentioning

confidence: 99%

Decrease of Carbonation, Sulfate and Chloride Ingress due to the Substitution of Cement by 10% of Non Calcined Bentonite

Andrade¹,

Martínez-Serrano²,

Sanjuán³

et al. 2021

Preprint

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Clinker production is being reduced worldwide in response to the need to drastically lower greenhouse gas emissions. The trend began in the nineteen seventies with the advent of mineral additions to replace clinker. Blast furnace slag and fly ash, industrial by-products that were being stockpiled in waste heaps at the time, have not commonly been included in cements. Supply of these additions is no longer guaranteed, however, due to restrained activity in the source industries for the same reasons as in clinker production. The search is consequently on for other additions that may lower pollutant gas emissions without altering cement performance. In this research bentonite, a very common clay, was used as such an addition directly, with no need for pre-calcination, an still novel approach that has gone little explored to date for reinforced concrete with structural applications. The results of the mechanical strength and chemical resistance (to sulfates, carbonation and chlorides) tests conducted are promising. The carbonation findings proved to be of particular interest, for that is the area where cement with mineral additions tend to be least effective. In the bentonite-bearing material analysed here, however, carbonation resistance was found to be low as or lower than observed in plain Portland cement.

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Medium-Term Mechanical Properties of Cement Mortar Modified with Bentonite Nanoparticles

Bunea,

Toma,

Alexa-Stratulat

et al. 2024

Lecture Notes in Networks and Systems

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Effects of bentonite on pore structure and permeability of cement mortar

Cited by 49 publications

References 44 publications

Reduced Carbonation, Sulfate and Chloride Ingress Due to the Substitution of Cement by 10% Non-Precalcined Bentonite

Reduced Carbonation, Sulfate and Chloride Ingress Due to the Substitution of Cement by 10% Non-Precalcined Bentonite

Decrease of Carbonation, Sulfate and Chloride Ingress due to the Substitution of Cement by 10% of Non Calcined Bentonite

Medium-Term Mechanical Properties of Cement Mortar Modified with Bentonite Nanoparticles

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