Dissertation > Excellent graduate degree dissertation topics show

Microstructure and Mechanism Research on Cement Stabilized Salt-rich Clay

Author: YangXiaoMing
Tutor: YeGuanBao；XuChao
School: Tongji University
Course: Geological Engineering
Keywords: Cement Soil Microstructures High salt content Scanning electron microscopy X-ray diffraction EDS analysis
CLC: TU447
Type: Master's thesis
Year: 2006
Downloads: 247
Quote: 8
Read: Download Dissertation

Abstract


Soil cement mixing method is a method commonly used in Soft Ground Treatment. However, in some of the country's coastal engineering applications, the the conventional proportioning and process cemented soil stirring disposal soft soil with high salt content results are unsatisfactory. Some laboratory test results are also significantly lower in the same cement content, the compressive strength of cement soil made of high salt content in soft soil. The mechanism of this phenomenon is not yet clear. The Institute is a Marine Soft Soil in Lianyungang, Jiangsu Province. Due to the intrusion of sea water, a high content of soluble salts in the soft soil of the region. Contrast of Mg 2 Cl - and SO the 4 / sub> the 2 - three ion concentration was significantly higher than in Shanghai the soft soil of the region. The field test results show that the conventional ratio in soil cement mixing pile slow growth of body strength, improve cement content, the effect is still not ideal. By inference, is likely to be high concentrations of soluble salts inhibited the soil cement hydration and hard coagulation process, resulting in lower intensity. In order to eliminate interference factors, the study \soluble salts. Also produced three sets of slag cement soil test block to compare. Test block in the standard curing to 7, 28 and 60 days to remove the unconfined compression test, the test of the X-ray diffraction and scanning electron microscopy and energy dispersive analysis. Wherein the scanning electron microscopic test using two different imaging means - secondary electron imaging and backscattered electron imaging. In order to enhance the credibility, the microscopic test results were analyzed using quantitative and semi-quantitative method. The study found: the high concentration of soluble salts indeed have relatively significant negative impact on the strength of the cement-soil. And the degree of influence of the three ions and time vary. Mg 2 affect the strength of the cement soil in late; Cl - of three age strength of cement soil were significantly affected; the SO 4 2 - , the long-term strength of the cement-soil. At the same time, the tests showed that the slag cement made of cement soil soluble salt is relatively much smaller. Finally, with the microscopic test, the author of three ions mechanism of slag cement resistance the soluble salts mechanism analysis, and micro-structure research of soil cement, and cement soil mixing method in the high salt content of soft foundation treatment some suggestions.

Related Dissertations

  1. Research on Welding Characteristics of CO2 Laser-GMA Hybrid Welding for Ultra-Low Carbon Bainitic Steel,TG456.7
  2. Investigations of Structure and Glass Forming Abilty of Amorphous Alloys,TG139.8
  3. Comparative Study on the Host Choice Mechanism of Helicoverpa Armigera (Hübner) and H.assulta (Guenée),S435.622.3
  4. Nano Pt / SiC Preparation, Characterization and Electrochemical Catalytic Performance,TM911.4
  5. Based on low-energy rays oil moisture measurement instrument of fast,TE622.1
  6. High Efficiency Embedded Processor IP Core,TP332
  7. Study of Microbial Corrosion in Central Air-conditioning Cooling Water System,TU831.4
  8. Packaging Light Extraction Efficiency Enhancement of LED Array Packaging with Various Micro-structures,TN312.8
  9. X-ray diffraction analysis of a single crystal nickel base alloy residual stress AM1,TG115.22
  10. The Effect of Beyond Tooth Bleaching on the Resin-enamel Micro-tensil Strength and the Microleakage of Resin Restoration,R783.1
  11. Effect of Dentin Demineralization Processed by Solution with Ethylenediamine Tetraacetic Acid,R781.2
  12. An Evaluation of Bacterial Dynamic Adhesion on Resin Infiltration by Using SEM,R783
  13. Influence of CPP-ACP Pretreatment on Resin-dentine Bonding,R783.1
  14. Effects of Different Surface Treatments on the Bond Strengths of Glass Ionomer Cements to Enamel,R783.1
  15. Experimental Study of Cold Light Bleaching on Dentin Surface Microhardness,R781.05
  16. The Research of Combined Emulsifiers on Enhancing Frost Resistance of Yeast and Improving Frozen Dough’s Quality,TS213.2
  17. Optical Properties of Pr3+ Doped 12CaO·7Al2O3 Powders Synthesized by Solid State Reaction Method,TF124.5
  18. Influence of Rolling and Cooling Processes on Microstructures and Mechanical Properties of 500MPa Steel Strip for Automobiles,TG335.5
  19. Heating system and hot deformation parameters on the microstructure and properties of X80 pipeline steel impact study,TG335.11
  20. Design of Grinding and Polishing System for Thin-Walled Microstructures and Study on Processing,TG580.6
  21. Syntheses, Characterizations and Crystal Structures of Organoantimony(V) Complexes Derived from Carboxylate Ligands,O627.4

CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Various types of soil and foundation > Soft soil and foundation
© 2012 www.DissertationTopic.Net  Mobile