Influence of various bentonites on the mechanical properties and impermeability of cement mortars

Liu, Mengliang; Yang, Hu; Lai, Zhenyu; Yan, Tao; He, Xin; Wu, Jie; Lu, Zhongyuan; Lv, Shanshan

doi:10.1016/j.conbuildmat.2020.118015

Cited by 42 publications

(22 citation statements)

References 40 publications

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“…In light of its vast diversity and fairly widespread geographic availability, clay is just one more local raw material [ 17 , 20 ] deployed in cement manufacture. The very same clays used in clinker kilns might, in certain proportions, constitute compatible additions to lower milling-related CO 2 emissions (since milling clay is less energy-intensive than grinding clinker).…”

Section: Discussionmentioning

confidence: 99%

“…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%

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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: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Correspondingly, the significance mechanism of CB is pore refinement and improving the impermeability of cement matrix (Masood et al, 2020;Rehman et al, 2019). Liu et al (2020) also concluded that the incorporating 10% CB developed the durability by filling effect and only the C-S-H gel formed on the surface of the specimen, whereas the strength development index need to be included (i) the forming of ettringite and (ii) the overlapping of hydration product on the specimen's surface.…”

Section: Water Absorptionmentioning

confidence: 97%

Sustainable mortar and concrete made from palm oil boiler clinker aggregate comprising rice husk ash and calcium bentonite: Compressive strength and durability assessment

Kueaket¹,

Tonnayopas²

2021

j.appsci

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This research was conducted to assess the performances of mortars and concretes made from palm oil boiler clinker aggregate (POBC) blending with rice husk ash (RHA) and calcium bentonite (CB). These blends were used to substitute of ordinary Portland cement (OPC) in the combined proportions of 5wt%CB+5wt%RHA, 5wt%CB+15wt%RHA, 15wt%CB+5wt%RHA, 10wt%CB+20wt%RHA, and 20wt%B+10wt%RHA. The POBC mortars were examined for compressive strength, water absorption, sulfuric acid resistance, and microstructural characterization at the age of 7, 28, and 56 days. Subsequently, the POBC concretes were tested for rapid chloride ion permeability and capillary absorption at 28 and 56 days of curing ages. As a result, the 56-day POBC mortar with the optimum blending of 5% CB and 15% RHA provided the greatest compressive strength of 48 MPa as well as revealed denser microstructure observed under scanning electron microscope (SEM) and greater durability against sulfuric acid attack which surpassed those of the POBC mortar without CB and RHA. Proportionately, the incorporation of 5-10% CB with 15-20% RHA to POBC concrete cured up to 56 days possessed greater durability performances by reducing the chloride ion permeability from moderate to very low ranges as well as lessening capillary absorption. The practical implications of this study are that the POBC could be potentially used in the building sector as a substitute to the conventional aggregates. In addition, the use of CB and RHA could be possibly replaced cement in the optimum proportions without compromising the strength and durability to produce efficiently sustainable POBC mortar and concrete.

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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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Influence of various bentonites on the mechanical properties and impermeability of cement mortars

Cited by 42 publications

References 40 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

Sustainable mortar and concrete made from palm oil boiler clinker aggregate comprising rice husk ash and calcium bentonite: Compressive strength and durability assessment

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

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