Study on new cementitious materials used for pile and stabilized soil in super saline soil

DOI Web Site 参考文献1件
  • Yang Pan
    Department of Civil Engineering, Beihang University
  • Huang Xin
    Department of Civil Engineering, Beihang University
  • Pi Jin
    Department of Civil Engineering, Beihang University
  • Yang Jianwei
    Department of Civil Engineering, Beihang University

抄録

More and more infrastructure have to be built on super saline soil in China, the salt content of which may be as high as 40wt.%. The salt corrodes the cement hydrate of the foundation. This paper reports preliminary research on anti-corrosion cementitious materials for concrete pile and stabilized soil pile. The results are as follows: Strength of magnesium oxychloride cement (MOC) and its hydrate Phase 518 (P5, the contributor of the strength) could develop and keep stable in the chloride brine, the ions other than those forming P5 did not affect P5 forming. So MOC possesses the characteristic of hydraulic cementitious material and the essential stability of corrosion resistance in the brine. Strength of GC (self-made binder) paste and stabilized soil stabilized with GC could develop and keep stable in the chloride brine. Both strength and height of diffraction peak of hydrated calcium silicate (CSH) of the specimen either curing in the brine or mixed with the brine were higher than that mixed with distilled water and standard curing. So the brine is favorable condition for GC hydrate growing rather than corrosion media. GM (self-made binder) didn’t include Ca2+, so eliminated the basic element to form expansive ettringite (AFt) when GM immerged in sulfur brine. Sulfur saline soil stabilized by GM curing in the sulfur saline could keep strength and volume stable. Strength of GM paste could keep stably in the sulfate solution.

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