The presence of sodium sulfate in the wash water can be detected by the reaction of the wash water with barium chloride (BaCl . 2 ). Cloudiness indicates the presence of sodium sulfate. 6. Dry to constant mass at 230° ± 9°F and cool to room temperature. 7. Sieve each test sample to refusal over a sieve having square openings one-half the

A novel water-soluble sand core hardened by twice microwave heating was fabricated using composite solution of magnesium sulfate and sodium sulfate as a …

In the other hand, the content of titano-magnetite (Fe2TiO4-Fe3O4) in the iron sand increase with addition of sodium sulfate (Na2SO4). Meanwhile, from semi-quantitative analysis result with the variation of sodium sulfate (Na2SO4) in 5%, 15%, and 25% have an optimum point on the addition of 15% sodium sulfate (Na2SO4) with 46,9% of titano ...

Article. Open access. Published: 07 May 2021. Characteristics of soil salt crust formed by mixing calcium chloride with sodium sulfate and the possibility of inhibiting wind-sand flow....

Images of salt crust formed by sodium sulfate or calcium chloride: (a) denotes sodium sulfate salt and (b) denotes calcium chloride salt. Numbers 1, 2 and 3 represent soil salt contents of 2%, 4% ...

A novel water-soluble sand core hardened by twice microwave heating was fabricated using composite solution of magnesium sulfate and sodium sulfate as a binder. The tensile strength, water absorption rate, gas evolution and water-soluble rate of the water-soluble composite sulfate sand core (WCSSC) were studied. The micro …

When the sodium sulfate content is greater than 0.5%, the freezing temperature of the frozen silty sand remains fairly constant [19, 36], as the salt solution reaches the supersaturated state and ...

Technical Service. Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others. Sigma-Aldrich offers Sigma-Aldrich-13462, Sodium sulfate (Na2SO4) for your research needs. Find product specific information including CAS, MSDS, protocols ...

First, saline soils containing sodium sulfate or magnesium sulfate were prepared, and the corresponding salt solutions were also prepared as references. ... The fine aggregate with a particle size range of 0.75–5 mm is river sand with a fineness modulus of 2.62, a clay content of 1.42 %, and an apparent density of 2.54 g/cm 3. Tap …

Saline loess is widely distributed in Africa, Latin America and Asia and is characterized by wet expansion and dry shrinkage, which has a large impact on the environment. In this study, the electrical resistivity of sodium sulfate loess and sodium chloride loess with moisture content (8–24%) and salt content (0.3–2.7%) was measured …

2.3 Water. Tap water was used for production of mixtures and to prepare the sulfate solutions. 2.4 Sulfate and Sulfate Solution. In the present study, sodium sulfate (Na 2 SO 4) was used to create the sulfate solution and sulfate was used in the mixtures.Three sulfate concentrations of 0%, 2% and 5% (by dry weight of soil to ensure …

Quartz sand with different particle sizes compounded with Sodium Dodecyl Sulfate solution was used to study the hydrate formation in the system at 275.15 K and 6 MPa under a saline environment ...

Figure 5 shows that the crust formed by sodium sulfate is mainly a lamellar structure with texture, which is easily broken when it is subjected to vertical pressure or high-speed erosion of sand ...

Sodium sulphate is present in some Indian soils. The salt is easily hydrated and dehydrated under the influence of climatic changes. There are enormous ... barium sulphate, filtering off the precipitate and weighing it. 2.5 Procedure -Take 10 g of soil from the sample prepared as given in 2.3, in a 250-ml bottle with 100 ml of distilled water. ...

The compressive strength of lightweight sand concrete at 18 months immersed in a sodium sulfate solution for (LSC (Na 2 SO 4)), increases by 40% …

Triaxial compressive tests were conducted on a frozen silty sand with four sodium sulfate contents (0.0%, 0.5%, 1.5%, and 2.5%) at temperature of -6 °C. The test results revealed that it is important and necessary to firstly identify whether the concentration of sodium sulfate solution in the silty sand is saturated for studying effects of the salt content on …

chloride with sodium sulfate ... wind‑sand ow Shenghui Li1,2, Chengzhi Li1,2,3* & Xiaolei Fu1,2 Soil salt crust can change the structure of aeolian soil and improve its resistance to wind erosion.

A Dictionary of Earth Sciences. sodium-sulphate soundness test A method of testing the weathering resistance, particularly to frost action, of building materials. A sample is soaked in saturated sodium-sulphate solution, drained, and dried. This is repeated and the sample examined for cracks. The method simulates the stresses due to frost action.

Granite sand was used to adsorb anionic surfactant, sodium dodecyl sulfate (SDS) from water at natural pH 6.25. The effect of adsorbent size, pH, temperature and amount of adsorbent has been examined. The results indicate that the Langmuir model provides the best correlation of experimental data.

gravity should range from 1.151 through 1.174 for the sodium sulfate solution, or from 1.295 through 1.308 for the magnesium sulfate solution. 4.1.4 Discard a discolored solution, or filter it and check for specific gravity. Table 2—Minimum Mass of Salt Per Liter of Water Salt MgSO4 Na2SO4 Anhydrous 350 g 215 g Crystalline 1400 g 700 g

Triaxial compressive tests were conducted on a frozen silty sand with four sodium sulfate contents (0.0%, 29 0.5%, 1.5%, and 2.5%) at temperature of 6 C. The test results revealed that it is ...

Sodium sulfate is a chemical compound that resembles white powder and is very water-soluble. Additionally, there are several additional sodium sulfate varieties with different water crystallization. Sodium sulfate has the chemical formula Na2SO4 N a 2 S O 4. This substance can be created intentionally as a by-product of processes, or it …

When the sand particles are completely coated by calcium chloride crystals, the color of the surface of the sample turns gray-white. ... Sodium sulfate crystals crystallize in the pores of sandy soil. The crystals of sodium sulfate aggregate to form large crystals and then wrap around the upper surface of the particles of sandy soil, forming a ...

Quartz sand, sodium sulfate and carbon (crushed) were mixed in a weight ratio of 100:81.4:6.5. Said mixture was charged continuously into a thermal insulation horseshoe-flame furnace and heated to 1420-1450° C. The resultant solid sodium silicate was dissolved in water and filtered to obtain a 3.5 M and 29 Be′ sodium silicate (water glass ...

The frozen saline silty sand exhibits the strain softening behavior under all testing confining pressure, which indicates that the existence of sodium sulfate …

The basic procedure is as follows (from Roberts et al., 1996 [1] ): Oven dry the sample and separate it into specific sieve sizes. Immerse the sample in a saturated solution of sodium or magnesium sulfate and let it remain at a constant temperature for 18 hours. Remove the sample from the solution and dry to a constant weight at 110 ± 5 o C ...

This study focuses on the mechanical properties of G-UHPC against sulfate attack at elevated temperature, thus, the following assumption was adopted: (1) G-UHPC is used as the mass concrete in an engineering structure constructed rapidly; (2) after casting G-UHPC, this structure would be naturally cured for 1 day, then, used in a sulfate …

Granite sand was used to adsorb anionic surfactant, sodium dodecyl sulfate (SDS) from water at natural pH 6.25.The effect of adsorbent size, pH, temperature and amount of adsorbent has been examined. The results indicate that the Langmuir model provides the best correlation of experimental data.

Representative samples for sandy loess, silty loess, and clayey loess sourced from Loess Plateau were applied in this study. Multiscale observational experiments under sodium sulfate erosion and direct shear tests were conducted with the aim to: (1) analyze the macroscopic, mesoscopic and microscopic deformation …

sulfate-resistant, and the cementitious sand containing glass powder demonstrated in-creased resistance to chloride penetration. Siad et al. [20] indicated that the glass powder ... by 67% when the sodium sulfate content was 2.5% and the glass powder dosing was 10%. Rashidian-Dezfouli et al. [24] investigated the effect of three …