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 ...
Geotechnical properties and applicability of bentonite …
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 ...
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
Compressive strength of Cement-Bentonite grouting
Increased strength: The addition of cement increases the compressive strength and shear strength of CB grout, making it suitable for use in structural applications. Reduced …
Effects of ionic strength and bentonite ratio on the …
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 ...
การทำแบบหล่อทรายชื้น (Greensand Molding) | iFoundryman
หลักเกณฑ์ในการเลือกเบนโทไนต์ (Bentonite Selection). 1. แหล่งของเบนโทไนต์ (Bentonite Source) ถือว่ามีความสำคัญมาก จะเป็นตัวบ่งบอกถึงคุณภาพของเบนโทไนต์ได้เป็นอย่างดี ...
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 ...
Unveiling the Re, Cr, and I diffusion in saturated compacted bentonite …
Both the rock capacity factor and effective diffusion coefficient in compacted bentonite increase as the ionic strength increase and the compacted dry density decrease. These trends are consistent with those reported in previous experimental studies [9, …
Strength characteristics of GMZ bentonite saturated with …
Bentonite is selected as a buffer and backfill material for deep geological repositories due to its high expansibility, low permeability, and excellent nuclide adsorptive. In order to study the effect of the pore solution of the surrounding rock on the strength of bentonite, GMZ07 bentonite specimens are saturated and consolidated in Na 2SO4 solution with …
Shear Strength and Volumetric Deformation Behavior of
The sand and bentonite samples were dried for 24 h in the oven. The 30% bentonite-70% sand mixture was chosen and these mixtures were named as 30B-70S. In order to maintain the hydraulic conductivity criterias 30% bentonite ratio was chosen because the impermeability increases as the bentonite ratio in the mixture increases.
Research Article Strength Characteristics of Bentonite …
The shear strength is also improved significantly than untreated soil (Hasan et al. 2021). The swelling pressure is decreased when soil is treated with silica fume from 0 to 10%. It also reports the increase in OMC & decreases in MDD while adding silica fumes. It additionally increases cohesion which is the reason for its strength
The use of a PAE /bentonite binary system to improve the wet strength
Furthermore, the increase in the WRV would also facilitate the bonding between fibers, which could lead to an increase in tensile strength. Fig. 2. Water retention value with different bentonite dosages (amount of PAE resin added was 0.8%, on a dry fiber basis)
The relationship between swelling and shear strength …
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 significant change in the friction angle with hydration time longer than 14 days.
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, …
Using Bentonite to Reduce Neat Cement Grout Losses in Soil …
This research investigated the introduction of varying percentages of bentonite, a naturally occurring clay mineral, as an admixture in the neat cement grout to increase the …
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.
Development of biodegradable bioplastic films from Taro …
It was found that the gelation temperature of the starch was 75 °C using a differential scanning calorimetry. With the increase in bentonite concentration, the tensile strength of the bioplastic film was found to increase. The bentonite films exhibited more resistance to salt and acid, were susceptible to alkali and showed minor swelling.
Improvement of mechanical strength of iron ore pellets …
An increase in bentonite addition causes an enhancement in drop number, compressive strength and porosity but compressive strength values tend to decrease with further addition of as received bentonite amount. In the case of upgraded bentonite addition, the compressive strength values increased with the increasing amount of bentonite.
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
The Impact of Moisture and Clay Content on the Unconfined …
The results revealed that the strength of treated bentonite increased with the increase in the moisture content up to 30% above the corresponding optimum moisture …
Improving the Anti-washout Property of Acrylate Grouting …
As the content of bentonite increases, this difference sharply decreases. This result may be related to the fact that when the AC content increases, the double bond active group in the reaction system increases, and the growth rate of the initiation chain increases, which accelerates the viscosity growth of the slurry (the number of ...
Tensile Strength of Class F Fly Ash and Fly Ash with Bentonite …
Raising the bentonite content to 15% increases the strain recorded at sample fracture, while the strength increase remains the same or decreases. Addition of bentonite increases the relative strain of the sample in proportion to the percentage of the additive. The value of relative strain during cracking in the fly ash sample with 15% addition ...
Developing an appropriate concrete mix for 3D concrete …
concrete using Bentonite clay as a rheological modier. Tests on various mixes reveal that adding 3% Bentonite increases compressive strength by up to 15% and initial shear strength by 60% compared to mixes without Bentonite. Additionally, Bentonite increases mix consistency but decreases ow by more than 50%.
Influence of initial water content on unsaturated shear strength …
This paper presents an experimental study on the influence of initial water content on unsaturated shear strength of compacted bentonite. Isotropic loading and triaxial shear tests were conducted on compacted GaoMiaoZi (GMZ) bentonite specimens with different initial water contents. Isotropic loading test and triaxial shear test results show that the compression …
IRON ORE PELLETIZING BENTONITE – …
When sodium bentonite is used as binder, the pellet strength increases after sintering. When sodium bentonite content is used between 0.25 and 1%, there is a continuous increase in pellet strength between 135-310 Kg / pellet …
Effects of ionic strength and bentonite ratio on the
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 ...
Soft computing models for prediction of bentonite plastic concrete strength
This study utilizes the two most common and most accurate variants of GP named as MEP and GEP for modelling strength of bentonite plastic concrete. Gene expression programming (GEP) ... Moreover, the SHAP values of bentonite shows an initial increase with increase in cement content but becomes almost constant when cement content reaches 120 kg. ...
Shear Strength of Soil-Bentonite Slurry Wall Backfill
Time-Dependent Strength Behavior of Soil-Bentonite Slurry Wall Backfill Jeffrey Evans1, and Christopher Ryan2 1 Bucknell University, Department of Civil and Environmental Engineering, ... the bond strength increases due to a more efficient orientation of water molecules in the vicinity of contact points (Leonards and Altshaeffl, 1964). In a
Effects of ionic strength and bentonite ratio on the
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%.
Understanding Gel Strength of Drilling Mud
Progressive Gel Strength. Usually, it increases with time in a stagnant drilling mud ("progressive" gels), which is reflected in the difference between the "zero" and "ten minutes" gel values (measuring gels subsequently after ten seconds and ten minutes is a standard procedure). Some progressiveness in gel values is required to ...