آخرین محصولات
Shear Strength Behavior of Perlite Added Sand-Bentonite
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 soils with high temperature. Thermally durable soil...
Activated Bentonite for Physical, Mechanical, and Durability …
Also, the surface area of ball-milled activated bentonite increases when the pressure rate increases as Sallem et al. ... 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 ...
Using Bentonite to Reduce Neat Cement Grout Losses in …
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 ...
Carrageenan and bentonite as wet strength agents in …
by bridging cellulose fibers, so it can be used to increase the physical strength of paper. Bentonite is a natural mineral consisting of alumino-silicate crystals which have a high cation exchange capacity and there are reactive hydroxyl groups on its surface so that it can increase the physical strength of paper [24].
Strength deterioration mechanism of bentonite modified …
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 ...
Compressive strength of Cement-Bentonite grouting
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
Thermal conductivity and shrinkage characteristics of bentonite …
The additives such as sand, granite, carbon fiber and graphite blended with bentonite increases the thermal and strength characteristics; moreover, it also provides adequate hydraulic ... is higher than the dry thermal conductivity (after 5 days curing time); whereas, the compressive strength increases with curing time. Wan et al. ...
Shear strength of bentonite saturated with saline solutions …
Investigation of saline solutions on the shear strength (SS) of compacted bentonite is desideratum to evaluate the safety of engineered barriers in order to safely dispose of the high-level radioactive waste.Undrained shear experiments were carried out on Na-bentonite saturated with CaCl 2, KCl, and NaCl solutions.The stress-strain relationship of all the bentonite samples …
Shear strength of bentonite saturated with saline solutions …
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 ...
Shear strength characteristics of unsaturated compacted GMZ bentonite …
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 ...
Investigation of shear strength of sand–bentonite mixtures …
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.
Time- and concentration-dependent shear strength …
Understanding the shear behaviors of compacted bentonite has been imperative to evaluate the mechanical stability of the buffer/backfill materials, especially under the influence …
The Permeability and Shear Strength of Compacted Claystone–Bentonite
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.
IMPROVEMENT OF MECHANICAL STRENGTH OF IRON …
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.
Carrageenan and bentonite as wet strength agents in the …
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 .
Role of bentonite in improving the anti-seepage durability …
This 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.
Ferrochrome Slag as an Alternative Mould Material for Green …
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 ...
Stabilization of iron ore tailings with cement and bentonite: …
The addition of bentonite increases the unconfined compressive strength (UCS) very little, whereas there is a great strength enhancement for tailing-cement mixtures, particularly after a period of moist curing. ... strength increase upon aging. Next to road constructions, other conceivable applications of cement-stabilized tailings at the ...
Shear strength of GMZ07 bentonite and its mixture with …
In the vertical stress ranging from 200 to 1600 kPa, the strength curves are linear for pure bentonite at all tested salt solution concentrations of 0–1 mol/L. It shows that the strength envelope increases gradually in the range of 0–1 mol/L, and the strength has fair increase with the increase of vertical pressure at the same concentration ...
Assessment of the lead and zinc contaminations on the …
increase in soil strength to the formation of the flocculate structure in the soil. As observed, there is a lot of research about the effects ... ples containing bentonite have lower compression strength. Also, by increasing the concentration of contaminants, soil samples containing bentonite gain strength, however, this
Shear strength behaviour of sand-bentonite mixtures …
Shear strength behaviour of sand-bentonite mixtures with pumice additivite under high temperature Esra Güneri1, Yeliz Yükselen Aksoy 2 ... Depending on increase in the number and type of energy geostructures, studies on the change in soil behavior against heat increase becomes more important. The engineering properties such as permeability,
Strength increases with bentonite rate.
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 maximum ...
Bentonite could be an eco-friendly windbreak and sand …
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 ...
A comparative study between strength and durability of bentonite …
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%.
The relationship between swelling and shear strength …
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 ...
Application of bentonite in cement-based composites: A …
According to the findings of Ashish and Srinivasarao [122], incorporating both BT and BF improves the splitting tensile strength. The increase in split tensile strength was due to …
Developing an appropriate concrete mix for 3D concrete …
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.
Performance of Ganga Sand with Bentonite as a Landfill …
With further addition of bentonite, the UCS value comes out to be 84.23 kPa for 30% bentonite content having an increase of 168.4%. Similarly, the strength of the mixture containing bentonite content up to 40 and 50% is 77.66 and 75.11 kPa, respectively, as shown in Fig. 8. The mixture containing 20% bentonite has a maximum unconfined ...
Effects of raw and different calcined bentonite on durability …
So, the results indicate that the employment of raw and calcined bentonite reduces the fresh bulk density, improves compressive strength, and Vicker hardness at 28 days, …
Effects of raw and different calcined bentonite on durability …
At 28 days of curing, the compressive strength of all raw and calcined bentonite replacements are higher than the control mixture. However, the compressive strength increases with increasing the bentonite calcination temperature. Especially, the replacement of 800 °C by 20% has the highest compressive strength than all samples at 28 and 56 days.
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