It can also be concluded on the basis of past literature that the SS of the saturated bentonite increases with the decrease of porosity or the increase of dry density, i.e., the closer the contact of bentonite particles, the higher the final SS of bentonite. ... the shear strength of bentonite in salt solution can be expressed by parallel ...
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From Fig. 44 it can be observe that the strength increases rapidly as the age increases. As the bentonite content increases the long term strength decreases this is due to non-availability of the cementetious content due to partial replacement of cement with bentnite which is a major requirement in the long term strength.
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Direct shear test results conducted on bentonite buffer materials find that shear strength decreases with increasing water content, while increases with dry density and vertical stress (Zhang et al., 2016; Xu, 2019; Zheng et al., 2022). This approach provides a simple way to determine strength parameters, but challenges, including difficulties ...
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Bentonite addition does not change density and porosity much but it increases compressive strength sharply. Fig. 4 shows that 10% bentonite addition to the SiC particles gives foam maximum ...
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The increase in shear strength phenomenon can be explained by the viscous shear resistance of water and fabric changes due to an increase in temperature. As temperature increases, the viscosity of water, that of around the bentonite particles, decreases.
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The bentonite is commonly used mixed with soils for groundwater retention and waste contaminant facilities. The incorporation of bentonite could significantly reduce hydraulic conductivity. In this study, the effects of bentonite content, hydration time and effective confining pressure on the static properties of a sand–bentonite mixture were studied using experimental …
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The results shows that the trend of increasing shear strength with 0 to 90 days of ageing effect as well as increase in Bentonite content in the mix proportion . Unconfined compressive strength (q u) increased from 78 kpa to 110 kpa(for minimum bentonite of 10%) with increase in ageing from 0 to 90 days and observed 140
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fined compressive strength of the bentonite + 8 % lime increased with the addition of 8 % phosphogypsum as well as an increase in the curing period up to 14 days.
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These bentonite grout mixes increase in strength at a higher rate between 3 and 14 days of curing before the rate of strength gain decreases between 14 and 28 days of curing. This trend indicates that the addition of bentonite into the grout, at least at the smaller percentages tested in the study, increases the curing rate of the bentonite ...
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mechanical properties of the bentonite grout. In addition, it increases its compressive strength and durability and decreases its permeability. The addition of cement contributes to a decrease in the intermolecular spaces; hence, the compressive strength increases. The chemical reaction between cement and bentonite was described as it pass through
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The results revealed that incorporation of bentonite (10 wt % with ordinary Portland cement) showed appreciable improvement in the strength and durability of both the …
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With increasing the bentonite concentration to 10% and after 96 h resting time, the monotonic shear strength of injected samples has 33% increase compared to clean sand. 5. With passing the time, in the samples with 10% bentonite, at Ru = 1, the strength of samples increase and they did not receive to 5% double-amplitude strain.
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The type of bentonite used in horizontal drilling applications is different than that of vertical drilling applications. A lower yield (less viscous) bentonite is often selected for horizontal drilling due to its enhanced ability to suspend cuttings, develop optimized gel strengths, enhanced borehole stabilization and filtration control, while producing a lower resultant viscosity.
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compressive strengths, drop number, and porosity in order to characterize the pellets. The results showed that untreated and upgraded sodium bentonite samples provided relatively stronger pellets compared to calcium and the mixed type bentonite samples needed activation with sodium bicarbonate to increase the strength of the pellets.
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The main uses of Bentonite are for drilling mud, binder (e.g. foundrysand bond, iron ore pelletizer), purifier, absorbent (e.g. pelletizer), increase the strength of concrete and as a groundwater barrier.
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Noori et al. (2019) carried out triaxial tests on sand/bentonite mixtures in which an increase in undrained strength with time was observed up to 100 hours. The undrained strength showed a ...
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This change led to a decrease in Cr(VI) adsorption capacity, from 775.19 mg/kg for pure clay to 378 mg/kg for mixture samples with excessive bentonite. Furthermore, as the ionic strength increases from 0 to 0.1 M, the Cr(VI) adsorption capacity increases slightly due to the weakening of electrostatic repulsion on the clay particle surface, but ...
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The bentonite content had a considerable effect on the cohesion of bentonite modified loess (BML), but insignificant on the internal friction angle 10. Low content of hydrophilic nano bentonite reduces the expansion potential of expansive soil and increases the strength, and it is feasible to apply the modified clay to the landfill cover 11 ...
WhatsApp: +86 18221755073This study adopted sodium bentonite (NaB) to enhance the anti-seepage durability of fly ash-based geopolymer cutoff wall backfill (GCWB) under dry–wet cycles. The influence of bentonite content on the workability, unconfined compressive strength, hydraulic conductivity and durability of GCWB was comprehensively examined.
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Employing bentonite increases strength and pozzolanic reactivity below 750°C and low-temperature bentonite activation enhances water absorption, reduces the water content, and increases the concentration of alkali solution and ion exchange capacities of bentonite.
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The addition of clay can increase soil strength and decrease wind erosion (Hanegbi and Katra, 2020). In this study, adding bentonite improved the surface shear strength and wind erosion resistance. ... Whereas, at 2% bentonite, the shear strength was 0.26 kg cm −2 reached a significantly higher level than biological crust (0.15 kg cm −2) (p ...
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strength agent from bentonite, and a mixture of carrageenan and bentonite in a 1:1 ratio with . ... increase the wet strength value compared to blank. The lowest value was at a dose of 10% at .
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Strength, permeability, and corresponding microstructure of bentonite-assisted MICP stabilized coarse sand after 10 treatment cycles. Relationship between permeability and (a) treatment cycles, (b ...
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As can be seen in the table, the increase in bentonite (added to claystone) resulted in an increase in the compressive strength for all samples up to the addition of 15% bentonite. At 5% bentonite, the average increase in shear strength was 1.6-fold, and an average of 2.4- and 3.0-fold at 10% and 15% bentonite contents, respectively.
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increases.Duetoobtainedresults,thesoilliquefaction resistance through time and due to thixotropic process of bentonite, increases faster but after a specified period of time the rate of increase was slower. The static triaxial tests on injected bentonite …
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Understanding the shear behaviors of compacted bentonite has been imperative to evaluate the mechanical stability of the buffer/backfill materials, especially under the influence …
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A continuous increase in the unconfined compressive strength is observed in the bentonite stabilised sand whereas an optimum percentage of both the biopolymers is observed as 1.5%.
WhatsApp: +86 18221755073increase in the quantity of bentonite shows a reduction in the compressive strength. The Flexural strength also shows a increase in strength for B15% & QD50% of replacement of Bentonite in …
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The strength increase as result of temperature increase is shown in Table 4. At 1100 8C strength increase reaches maximum value 2.44 MPa and drops slightly above the 1100 8C. These results are ...
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The shear strength of slag mould under different moisture and bentonite content is shown in Fig. 4. It is observed that as the concentration of bentonite clay and moisture increases, the shearing strength of slag mould increases. The bentonite clay creates a bond with mould ingredients in the presence of moisture or water . Therefore, as ...
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