A Study of Stabilizer for Saline Sludge

2011 ◽  
Vol 477 ◽  
pp. 185-189 ◽  
Author(s):  
Zhan Guo Li ◽  
Yin Cheng ◽  
Xin Huang ◽  
Xiao Ming Shen
Keyword(s):  
Comparative Analysis ◽  
Portland Cement ◽  
Saline Soil ◽  
Soft Soil ◽  
Large Area ◽  
Soil Stabilizer ◽  
Stabilized Soil ◽  
Stabilization Effect ◽  
Tianjin Binhai New Area

There is large-area saline sludge which should be stabilized in China. However when cement is used as a stabilizer the strength and stabilization effect on the soil is relatively poor. In this paper, In this paper Portland cement PC is compared to a soft soil stabilizer A developed by the authors for use in stabilizing chloride saline soil from the Tianjin Binhai New Area. The strength of stabilized soil was tested by comparative Analysis, and XRD and SEM tests were used to analyze the hydrate types in stabilized soil. Preliminary tests results suggest that the salts present in hydraulic sludge and stabilizer A were able to react and formed a new hydrate----- Ca4Al2Cl2O6 • 10H2O which cannot be produced by cement alone, and which can greatly increase strength of stabilized soil.

Review of Soil Stabilization Techniques: Geopolymerization Method one of the New Technique

2015 ◽  
Vol 660 ◽  
pp. 298-304 ◽  
Author(s):  
Hazamaah Nur Hamzah ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Heah Cheng Yong ◽  
Mohd Remy Rozainy Arif Zainol ◽  
Kamarudin Hussin
Keyword(s):  
Soil Stabilization ◽  
Soft Soil ◽  
Soil Samples ◽  
Construction Process ◽  
Soil Stabilizer ◽  
Stabilized Soil ◽  
Moderate Load ◽  
Ucs Test ◽  
Problematic Soil

This paper studies the effectiveness of soil stabilizer on the problematic soil or soft soil. It is subjected to instability and massive primary and long term consolidation settlements when subjected to even moderate load increases. The purpose of this study is to review the techniques and materials that have been used in the soil stabilization by previous researchers. The performance of the soil stabilizer for stabilization by means of strength has been highlighted in this study. Unconfined compressive strength (UCS) test was carried out on stabilized soil samples and the results that obtained were discussed. The use of these techniques and materials may provide an inexpensive and advantageous construction process. As a conclusion, the strength of soil can be increased by using these materials and techniques in soil stabilization. This paper gives a comprehensive report on stabilization techniques and materials that have been used for soft soil and also discuss the potential of geopolymerization technology to be one of the new soil stabilization techniques.

The Assessment of the Strength and Water Stability of Waste-Based Solidification of Binzhou Saline Soil

2021 ◽  
Vol 881 ◽  
pp. 157-162
Author(s):  
Jia Lin Hou ◽  
Sheng Jie Zhou ◽  
Yan Zhang ◽  
Liang Fan
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Saline Soil ◽  
Base Layer ◽  
Water Stability ◽  
Curing Agent ◽  
Strength Change ◽  
Soil Stabilizer ◽  
Stabilized Soil ◽  
Technical Specifications

This document takes saline soil in Binzhou as the research object using smelter slag as the soil stabilizer to solid saline soil in Binzhou, which has been proved achieving good performance of saline soil solidification. The results show that the soil solidification developed indoors can be used in combination with low-dose lime to achieve good performance in solidification of saline soil. The 7d strength is relatively higher than that of both ordinary lime stabilized soil and lime-fly ash stabilized soil, which completely meet the unconfined compressive strength requirements of the base layer in the current technical specifications. The soil stabilizer can improve the unconfined compressive strength of the saline soil, especially the post-14-day strength, and improve the immersion compressive strength and water stability of the cured saline soil. As the dosage of curing agent gets higher than seven percent, the 28d strength change of cured soil is no longer significant. The test result demonstrates that the dosage of curing agent should be less than seven percent.

scholarly journals Strength Performance and Microstructure of Calcium Sulfoaluminate Cement-Stabilized Soft Soil

2021 ◽  
Vol 13 (4) ◽  
pp. 2295
Author(s):  
Hailong Liu ◽  
Jiuye Zhao ◽  
Yu Wang ◽  
Nangai Yi ◽  
Chunyi Cui
Keyword(s):  
Soft Soil ◽  
Hydration Product ◽  
X Ray Diffraction ◽  
Calcium Sulfoaluminate Cement ◽  
Strength Performance ◽  
X Ray ◽  
Calcium Sulfoaluminate ◽  
Stabilized Soil ◽  
Calcium Silicates ◽  
Hydrated Calcium

Calcium sulfoaluminate cement (CSA) was used to stabilize a type of marine soft soil in Dalian China. Unconfined compressive strength (UCS) of CSA-stabilized soil was tested and compared to ordinary Portland cement (OPC); meanwhile the influence of amounts of gypsum in CSA and cement contents in stabilized soils on the strength of stabilized soils were investigated. X-ray diffraction (XRD) tests were employed to detect generated hydration products, and scanning electron microscopy (SEM) was conducted to analyze microstructures of CSA-stabilized soils. The results showed that UCS of CSA-stabilized soils at 1, 3, and 28 d firstly increased and then decreased with contents of gypsum increasing from 0 to 40 wt.%, and CSA-stabilized soils exhibited the highest UCS when the content of gypsum equaled 25 wt.%. When the mixing amounts of OPC and CSA were the same, CSA-stabilized soils had a significantly higher early strength (1 and 3 d) than OPC. For CSA-stabilized soil with 0 wt.% gypsum, monosulfate (AFm) was detected as a major hydration product. As for CSA-stabilized soil with certain amounts of gypsum, the intensity of ettringite (Aft) was significantly higher than that in the sample hydrating without gypsum, but a tiny peak of AFm also could be detected in the sample with 15 wt.% gypsum at 28 d. Additionally, the intensity of AFt increased with the contents of gypsum increasing from 0 to 25 wt.%. When contents of gypsum increased from 25 to 40 wt.%, the intensity of AFt tended to decrease slightly, and residual gypsum could be detected in the sample with 40 wt.% gypsum at 28 d. In the microstructure of OPC-stabilized soils, hexagonal plate-shaped calcium hydroxide (CH) constituted skeleton structures, and clusters of hydrated calcium silicates (C-S-H) gel adhered to particles of soils. In the microstructure of CSA-stabilized soils, AFt constituted skeleton structures, and the crystalline sizes of ettringite increased with contents of gypsum increasing; meanwhile, clusters of the aluminum hydroxide (AH3) phase could be observed to adhere to particles of soils and strengthen the interaction.

scholarly journals An Improved Mechanistic-Empirical Creep Model for Unsaturated Soft and Stabilized Soils

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4146
Author(s):  
Xunli Jiang ◽  
Zhiyi Huang ◽  
Xue Luo
Keyword(s):  
Water Content ◽  
Unsaturated Soils ◽  
Simulation Analysis ◽  
Soft Soil ◽  
Creep Model ◽  
Subgrade Soils ◽  
Stabilized Soil ◽  
Deformation Behaviors ◽  
Creep Models ◽  
Moisture Conditions

Soft soils are usually treated to mitigate their engineering problems, such as excessive deformation, and stabilization is one of most popular treatments. Although there are many creep models to characterize the deformation behaviors of soil, there still exist demands for a balance between model accuracy and practical application. Therefore, this paper aims at developing a Mechanistic-Empirical creep model (MEC) for unsaturated soft and stabilized soils. The model considers the stress dependence and incorporates moisture sensitivity using matric suction and shear strength parameters. This formulation is intended to predict the soil creep deformation under arbitrary water content and arbitrary stress conditions. The results show that the MEC model is in good agreement with the experimental data with very high R-squared values. In addition, the model is compared with the other classical creep models for unsaturated soils. While the classical creep models require a different set of parameters when the water content is changed, the MEC model only needs one set of parameters for different stress levels and moisture conditions, which provides significant facilitation for implementation. Finally, a finite element simulation analysis of subgrade soil foundation is performed for different loading levels and moisture conditions. The MEC model is utilized to predict the creep behavior of subgrade soils. Under the same load and moisture level, the deformation of soft soil is largest, followed by lime soil and RHA–lime-stabilized soil, respectively.

COMPARATIVE ANALYSIS OF CLINICAL EFFICIENCY OF THE DRUG “BIO-DENT” IN BIOLOGICAL METHODS OF TREATMENT OF PULPITES BY THE METHOD OF INDIRECT COATING

2021 ◽  
Vol Special issue (1) ◽  
pp. 51-56
Author(s):  
Nigora Djuraeva ◽  
Keyword(s):  
Comparative Analysis ◽  
Portland Cement ◽  
Calcium Hydroxide ◽  
Dental Pulp ◽  
Mineral Trioxide Aggregate ◽  
Clinical Efficiency ◽  
Near Term ◽  
Biological Methods ◽  
Methods Of Treatment

The article presents the results of using a material based on the mineral trioxide unit “Bio-Dent”for the indirect coating of the pulp. It was found that there were no complaints from the use of domestic Portland cement both in the near term (98.8%) and inthe long term after treatment in comparison with materials based on calcium hydroxide (72.5%). Stabilization of the pulp electroexcitability indicators at the level of 10 mkA was noted with the use of the material based on MTA “Bio-Dent”as a medical liner for indirect pulp covering.Keywords: dental pulp,indirect pulp coating, calcium hydroxide, mineral trioxide aggregate, pulp electroexcitability.

The Application of Ground Granulated Blast Slag in Soft Soil Treatment

2013 ◽  
Vol 405-408 ◽  
pp. 262-269
Author(s):  
Li Shao ◽  
Long Liu ◽  
Yi Min Tao ◽  
Ling Miao Lou
Keyword(s):  
Comparative Analysis ◽  
Traditional Method ◽  
Economic Benefit ◽  
Soft Soil ◽  
Social Benefit ◽  
Soil Treatment ◽  
Atterberg Limits ◽  
Environmental Benefit ◽  
Lime Stabilization ◽  
Compaction Characteristics

The characters, research and utilization of Ground Granulated Blast Slag are presented in this paper. Some current use of GGBS in soft soil treatment is introduced. In addition, the paper also focuses on the comparative analysis of the effects of GGBS and Lime Stabilization which is the traditional method in soft soil treatment on compaction characteristics & Atterberg limits. Next, the strength mechanism of GGBS, a kind of Soli Stabilizer applied in soft soil treatment, is mainly explained and also the validity of GGBS has been proved. All of these indicate that GGBS has the superiority of social benefit, economic benefit and environmental benefit in soft soil treatment.

Compressive Strength Analysis of Ionic Soil Stabilizer Improving Soil

2015 ◽  
Vol 667 ◽  
pp. 341-346 ◽  
Author(s):  
Jue Qiang Tao ◽  
Wen Yan Lin ◽  
Xiao Hua Luo ◽  
Xin Qiu ◽  
Jin Hong Wu
Keyword(s):  
Compressive Strength ◽  
Strength Analysis ◽  
Dry Density ◽  
Optimal Dosage ◽  
Maximum Dry Density ◽  
Soil Stabilizer ◽  
Limit Test ◽  
Stabilized Soil ◽  
Compaction Degree ◽  
Curing Age

To explore the ionic liquid soil stabilizer improved soil mechanical properties, this experiment conducted liquid-plastic limit test and compaction test. On the basis of determining the optimal dosage of ionic soil stabilizer and mastering different mixture optimum moisture content and maximum dry density, the standard sample which consists of the Zhejiang red-brown clay and curing material including ionic soil stabilizer, cement and lime carried out the unconfined compressive strength test in different curing age and compaction degree. This paper analyzed the change reason of compaction and curing age about the stabilized soil. The results show that the ionic soil stabilizer has a significant effect on the compressive strength improvement of stabilized soil. Compared stabilized soil with traditional treatment soil, the compressive strength of stabilized soil has improved obviously with the increase of curing age and compaction degree. Research findings provide useful technical support and practice basis for promoting and applying ionic soil stabilizer in infrastructure construction.

Principle and method of optimization design for soft soil stabilizer

2009 ◽  
Vol 24 (1) ◽  
pp. 154-160 ◽  
Author(s):  
Xin Huang ◽  
Zhanguo Li ◽  
Jianguo Ning ◽  
Sheng Xu
Keyword(s):  
Optimization Design ◽  
Soft Soil ◽  
Soil Stabilizer

scholarly journals Comparative Analysis of Selected Physicochemical Properties of Pozzolan Portland and MTA-Based Cements

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Maura Cristiane Gonçales Orçati Dorileo ◽  
Ricardo Dalla Villa ◽  
Orlando Aguirre Guedes ◽  
Andreza Maria Fábio Aranha ◽  
Alex Semenoff-Segundo ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Comparative Analysis ◽  
Portland Cement ◽  
Physicochemical Properties ◽  
American National Standard Institute ◽  
Statistical Analyses ◽  
National Standard ◽  
Distilled Water ◽  
Mean Values ◽  
Level Of Significance

Physicochemical properties of pozzolan Portland cement were compared to ProRoot MTA and MTA BIO. To test the pH, the samples were immersed in distilled water for different periods of time. After the pH analysis, the sample was retained in the plastic recipient, and the electrical conductivity of the solution was measured. The solubility and radiopacity properties were evaluated according to specification 57 of the American National Standard Institute/American Dental Association (ANSI/ADA). The statistical analyses were performed using ANOVA and Tukey’s test at a 5% level of significance. Pozzolan Portland cement exhibited pH and electrical conductivity mean values similar to those of the MTA-based cements. The solubilities of all tested materials were in accordance with the ANSI/ADA standards. Only the MTA-based cements met the ANSI/ADA recommendations for radiopacity. It might be concluded that the pH and electrical conductivity of pozzolan Portland cement are similar to and comparable to those of MTA-based cements.

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