As reported in the previous section, regardless of pure bentonite or the mixture, the shear strength or resistance increases significantly with increasing the salt solution concentration. From the results of compression tests on the pure bentonite or the mixture, it can be found that the void ratio at the same vertical stress reduced due to ...
strength of bentonite. Hydrated bentonite has very low shear strength, which is why its impact on the internal shear strength ... hydraulic conductivity of bentonite is an increase in the content of montmorillonite; specific surface area (decrease in the size of particles); electrical charge deficit and sodium content ...
Shear strength testing show decreasing cohesion with longer hydration of bentonite. The friction angle increases with hydration that lasts from 7 to 14 days. There is no …
The results show that the shear strength of polymer-bentonite interface is higher than that of the pure bentonite. An increase in either initial normal stress or polymer density improves the shear strength of polymer-bentonite interface, while a higher moisture content of bentonite reduces it. Moreover, the polymer-bentonite composite …
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 ...
Strength, permeability, and corresponding microstructure of bentonite-assisted MICP stabilized coarse sand after 10 treatment cycles. Relationship between permeability and (a) treatment cycles, (b ...
It is clearly seen that the shear strength and modulus of elasticity decrease with the increase in the content of bentonite (as given in Table 6). The minimum documented values for shear strength are 0.01 MPa and 0.33 MPa, respectively, at 7 and 28 days, for Experiments No. 15 and 31 (C1B4D3F4L2P1 and C2B4D3F1L2P4).
Polypropylene fiber (PF) and bentonite can affect the strength and permeability of loess, respectively, the optimization of mixing amount of PF and bentonite is of great significance to engineering practice. In this study, the response surface method was used to study the effect of PF content, length, and bentonite content on unconfined …
Increasing bentonite amount from 2% to 9% increased the compression strength of the specimens significantly from 1.23 kg cm −2 to 3.16 kg cm −2, …
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 the eective diusion coecient (D e) increases by 21.97%.
The sorption and desorption of uranium(VI) on GMZ bentonite was investigated as functions of contact time, pH, ionic strength, foreign ions, HSs and initial U(VI) using batch experiments. It is revealed that the sorption strongly depended on pH, cations (Li+, Na+ and K+) and anions (CO3 2−, SO4 2− and PO4 3−). HA benefits the …
Thermal activation of bentonite through heat treatment can enhance its pozzolanic activity 17,18,19, which in turn increases the compressive strength of the material and addresses the issue of ...
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 ...
The rate of increase in the plastic limit was on the higher side compared to the liquid limit, which reduced the plasticity index. The percentage increase in the unconfined compressive strength and tensile strength at optimum dose as compared to bentonite is 88.13% and 56.56%, respectively, after 28 days of curing.
shear strength improvement of liner material is the permeability of the mixtures. The addition of zeolite to bentonite has the opportunity to increase the shear strength of bentonite [13], but the increase in shear strength also has the potential to increase the permeability of mixed materials [14].
The general results show that with the addition of colemanite, the shear strength of the sand-bentonite mixtures increased with increasing temperature. In field applications, colemanite can be used to increase the shear strength of sand-bentonite mixtures. It should be noted that the contribution the colemanite to the compression is …
It is very clear that the suction value that representing a particular stage increases as the bentonite content increases making the ranges of apparent cohesion far greater than specimens without bentonite content, as shown in Table 6. Therefore, fine grain soils would lose great amount of its strength during the transformation from …
In this compacted sand–bentonite material, for the pressure range at which the tests were performed ... Tests have shown that strength increases with increasing matric suction but, depending on the microstructure, may decrease with increasing osmotic suction if the densities are the same. If specimens are made at the same dry density, the ...
Excellent plasticity and lubricity, high dry-bonding strength, high shear and compressive strength, low permeability and low compressibility make …
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.
Again, soil with closely packed parallel particles is weaker, and bentonite addition increases the strength of the local soil with increasing bentonite as increased flocculation results in a more random particle orientation (Lambe, 1958a). However, this has not always been the case, and some studies have found that as the bentonite content in ...
The slurry shield tunneling method has been widely used in the construction of underwater tunnels. However, during the construction of submarine tunnels, seawater can influence the engineering properties of bentonite slurry, which can cause excavation instability and other problems. This study aims to investigate the effect of seawater on …
Research has shown that, when bentonite and kaolinite are contaminated with heavy metals separately, bentonite's shear strength increases, while kaolinite's decreases (Wahid et al. 2011; Gratchev and Towhata 2013). Miranda-Trevino and Coles examined the effect of heavy metals on kaolinite properties. Their findings revealed that …
Compressive strength was improved by an extent of 10% and 18% for raw and treated bentonite-GPC mixtures, respectively, compared to the control mix without bentonite. This increase in strength can be attributed to the bentonite filler and pozzolana reaction properties, which improved the strength and led to a more …
The ultimate strength of the kaolinite and bentonite samples contaminated with 10,000 ppm lead nitrate are 350 kPa; and 330 kPa, respectively. An increase in lead nitrate concentration to 20,000 ppm causes a strength rise in the bentonite sample, and a strength fall in the kaolinite one. So, it is obvious that bentonite samples gain strength ...
Variation of unconfined compressive strength with increase in bentonite content in red soil-bentonite mixture. ... It is evident from the figure that with the increase in bentonite content, the hydraulic conductivity of red soil-bentonite mixtures decreased significantly when tested from the as-compacted state ...
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. The ...
The strength of each mix was measured by conducting tests on three identical specimens of 150 × 150 × 150 mm size and the average strength of the three specimens is reported in Figure 8. It can be observed that an increase in the compressive strength was observed for 10% bentonite replacement than the corresponding control …
A comparison of Figs. 5.5 and 5.6 shows that the calcium bentonite tends to develop much lower dry strength than the sodium bentonite. Further, the dry strength …
Further increase of bentonite, beyond 10%, reduces the compressive strength of the concrete cylinders. The best possible reason for the increase in strength with bentonite is the pozzolanic reaction, …
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 …
The present study investigates the shear strength behavior of perlite added sand-bentonite mixtures under room temperature and thermal cycling. The increase in the number of energy structures causes interaction of …
