Experimental Study on Influence of Vaporous Water on Salt Expansion of Sulfate Saline Soil

Peng, Shuquan; Wang, Fan; Fan, Ling

doi:10.1155/2019/6819460

Cited by 12 publications

(5 citation statements)

References 15 publications

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“…As shown in Figure 10 , with the sodium sulfate content increasing, the wetness degree and cohesion of the material decrease. This is mainly due to some water absorbed by sodium sulfate to form Na 2 SO 4 ·10H 2 O crystallization, so that the amount of bound water is improved [ 8 , 35 ]. By contrast, when there is no sodium sulfate in the CSMBM, the wetness degree and cohesion of the material are the highest.…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…There is a large difference (about 20-25 • C) between monthly average maximum temperature and the monthly average minimum temperature each month in the last 10 years. The form of the sodium sulfate and the hydration reaction rate of the cement are affected by the temperature easily [8,9,17].…”

Section: The Local Environment Temperaturementioning

confidence: 99%

“…The sodium sulfate can exist in three forms: sodium sulfate solution, thenardite, mirabilite (Na 2 SO 4 •10H 2 O), which was caused by the content of sodium sulfate and environment temperature. When it was at temperature below 32.4 • C, the Na 2 SO 4 •10H 2 O is the only stable phase; when it was at temperature above 32.4 • C, the thenardite is the only stable phase [6][7][8][9]. Lai et al [5] and Bing et al [10] and Zhang et al [11] thought that a ratio of molar volume change for Na 2 SO 4 •10H 2 O particle is 3.14 times and the transformation between thenardite and Na 2 SO 4 •10H 2 O is dependent on temperature.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Temperature and Sodium Sulfate Content on the Compaction Characteristics of Cement-Stabilized Macadam Base Materials

Tang

Mao

et al. 2020

Materials

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This paper describes an experimental investigation into the compaction characteristics of cement-stabilized macadam base materials (CSMBM) in a saline soil area. Through the field tests, the main causes of arch expansion in an existing road were analyzed. Based on this, the compaction tests and microscopic tests were designed to analyze the impacts of temperature, sodium sulfate content and cement content on the compaction characteristics of CSMBM. Then, the orthogonal test was designed to analyze the effects of the degree of the temperature, the cement content, and the sodium sulfate content on the compaction results of the CSMBM. Feld tests results show that the temperature, sodium sulfate content and cement content may be the main causes of arch expansion. The compaction tests show that with the temperature increasing, the optimal water content (OWC) decreases, but the maximum dry density (MDD) increases; with the sodium sulfate content increasing, the OWC increases, but the MDD decreases; with the cement content increasing, both MDD and OWC increase. The microscopic tests show that the increase of temperature and cement content is beneficial to the compactness between cementitious materials and aggregates, while the increase of sodium sulfate content makes the whole structure of cementitious materials and aggregates increasingly rough. The orthogonal test shows that the temperature has the greatest influence on the MMD, and the sodium sulfate content has the greatest influence on the OWC. Thus, in a sulfate saline soil area, the construction temperature, the sodium sulfate content and the cement content should be controlled to ensure the compaction quality of CSMBM.

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Section: Test Results and Discussionmentioning

confidence: 99%

Section: The Local Environment Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Temperature and Sodium Sulfate Content on the Compaction Characteristics of Cement-Stabilized Macadam Base Materials

Tang

Mao

et al. 2020

Materials

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“…e stabilization time is dependent on the soil size and the cooling pattern [20]. Previous studies [8,33] set each testing stage (with a change of temperature level) as lasting from 2 to 8 hours. e salt swelling development is insufficient when the stabilization time is short.…”

Section: Introductionmentioning

confidence: 99%

The Equilibrium Time and Salt Expansion Characteristic of Sulfate Saline Soil upon Cooling

Wang³

et al. 2021

Advances in Materials Science and Engineering

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The salt expansion disease is severe for the soil containing sodium sulfate in cold regions. This paper carried out one-dimensional salt expansion tests of saline soil, the crystallization test of saturated sodium sulfate solution, and the numerical cooling tests to explore the stability time of the salt expansion test and determine the standard procedure of salt expansion tests. The test results demonstrate that (i) the temperature equilibrium and the crystallization process are almost simultaneously completed in both sulfate saline soil and sulfate solution upon cooling; (ii) referring to the deformation equilibrium standard used in soil consolidation test, an expansion rate of less than 0.02 mm/h is suggested in the saline expansion test; and (iii) the equilibrium time is found to have a quadratic polynomial relationship to sample size and is much shorter under liquid bath conditions than under gas bath conditions. Based on these findings, a standard procedure of the one-dimensional salt expansion test is proposed, in which the test equipment, the test process, the deformation stabilization time of salt expansion, and the data processing method are provided. As the deformation and the temperature are synchronized, the deformation stabilization time of samples with different sizes in different cooling media is recommended.

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“…The main reason is that it is located in the Yellow River flood area, and the salinization is serious, which makes the salt damage in Zhouqiao site the most serious.The deterioration of salt on site soil has attracted the attention of many scholars. So far, studies on the effect of salinity on site soil deterioration have focused on the types of salt diseases 1-4 , the distribution patterns of salinity [5][6][7][8] and the mechanisms of site soil deterioration [9][10][11][12] . Under the action of salt, the main diseases produced by buildings and soils are flake stripping, salt precipitation, chalking, root hollowing, etc.…”

mentioning

confidence: 99%

Study on deterioration mechanism of soil in Zhouqiao site under salinization

Yue

Gao

Zhao

et al. 2022

Sci Rep

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Alkalinity production is one of the most typical and widespread salinization hazards on the Loess Plateau. Based on the characterization of typical flooding sites and the results of salt monitoring, this study investigates the deterioration mechanism of salinization on Zhouqiao site. The orthogonal test was used to simulate the effects of different concentrations of MgSO4, NaCl and CaCl2 under natural conditions on the quality change, salt analysis out location, surface phenomenon, strength and electrical conductivity of the soil at the Zhouqiao site, and to make a preliminary analysis on the mechanism of saline deterioration of the site soil. The results show that the soil column mass increased significantly under the action of salt, and the rate of salt absorption in the soil column decreased when the critical value was reached, and the critical values were different under the action of different kinds of salts. The rate of salt analysis is also influenced by the salt concentration and the number of cycles, which gradually increases with the increase of salt concentration and the number of cycles. The nominal strength of the soil column with the number of cycles, but occasionally increases. The conductivity increases with the number of cycles, and the magnitude distribution of the conductivity of the soil column under the action of different salts is not exactly the same.

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Experimental Study on Influence of Vaporous Water on Salt Expansion of Sulfate Saline Soil

Cited by 12 publications

References 15 publications

Influence of Temperature and Sodium Sulfate Content on the Compaction Characteristics of Cement-Stabilized Macadam Base Materials

Influence of Temperature and Sodium Sulfate Content on the Compaction Characteristics of Cement-Stabilized Macadam Base Materials

The Equilibrium Time and Salt Expansion Characteristic of Sulfate Saline Soil upon Cooling

Study on deterioration mechanism of soil in Zhouqiao site under salinization

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