Corrosion of Buried Steel at New and In-Service Infrastructure (2023) / Chapter Skim
Currently Skimming:
3 Subsurface Environment
3 Subsurface Environment
Pages 29-34
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 29... ...
SOIL Soils, which are known among geoscientists as unconsolidated sediments, are surface and subsurface materials composed of three phases: inorganic mineral grains, void space occupied by gas (most commonly air) , and void space occupied by liquids (most commonly water)
|
From page 30... ...
. In buried-steel applications, imported fills are chosen primarily for their engineering properties including strength and stiffness, as well as for their corrosion-resistance properties, including low electrical activity, rapid drainage, and low geochemical reactivity.
|
From page 31... ...
Secondary Descriptors Gravel size >4.75 Well graded, poorly graded, with silt, or with claya Sand size 0.075–4.75 Well graded, poorly graded, with silt, or with clay Silt size 0.002–0.075 High plasticity or low plasticityb Clay size <0.002 High plasticity or low plasticity a A well-graded soil has a wide range of particle sizes, with no concentration of particles in a single size and no gaps in the grain size distribution. A poorly graded soil consists of particles that are predominantly one size, as defined in ASTM D422-63 (2016)
|
From page 32... ...
The solid lines represent equilibrium conditions for the reactions between the various species. The dotted lines are found on all Pourbaix diagrams and represent the equilibrium potentials for the hydrogen evolution (a)
|
From page 33... ...
Grain size in rocks refers to the size of the individual mineral grains or crystals that make up the rock mass, with sizes that vary from microscopic to centimeter or larger in scale. Rocks may also include void space at as much as 40 percent of total volume, which is a function of the formation environment.
|
From page 34... ...
Cementitious grout is used to permeate soils and to fill rock fractures, and its most common use with respect to buried steel is to surround steel inserted in a drill hole (e.g., ground anchors)
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.