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Growth of Gel Microstructures betwee...

Guo, Rui.

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Growth of Gel Microstructures between Stressed Silica Grains and its Effect on Soil Stiffening.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Growth of Gel Microstructures between Stressed Silica Grains and its Effect on Soil Stiffening./
作者:	Guo, Rui.
面頁冊數:	84 p.
附註:	Source: Masters Abstracts International, Volume: 51-06.
Contained By:	Masters Abstracts International51-06(E).
標題:	Engineering, Civil. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1536458
ISBN:	9781303048241

Growth of Gel Microstructures between Stressed Silica Grains and its Effect on Soil Stiffening.
Guo, Rui.

Growth of Gel Microstructures between Stressed Silica Grains and its Effect on Soil Stiffening. - 84 p.

Source: Masters Abstracts International, Volume: 51-06.

Thesis (M.S.)--Duke University, 2013.

Laboratory tests on microscale are reported in which two amorphous silica cubes were compressed in a liquid environment, namely in solutions with different silica ion concentrations for up to four weeks. Such an arrangement represents an idealized representation of two sand grains. The grain surfaces and asperities were examined in Scanning Electron Microscope (SEM) and Atomic Force Microscope (AFM) for fractures, silica gel growth, and polymer strength. In 500ppm solution, silica gel structures a few hundred microns long appeared between stressed silica cubes. In 200ppm solution, silica deposits were found around damaged grain surfaces, while at 90ppm (below silica solubility in neutral pH), fibers a few microns in length were found growing in cube cracks. AFM pulling tests found polymers with strength in the order of 100nN and length between 50 and 100 nm. After aging, size of silica gel is in the order of 10-100 microm with intergranular strength in the order of 0.01-1 mN. We concluded that prolonged compression produced damage in grains, raising local Si ion concentration, and accelerating precipitation, polymerization and gelation of silica on grain surfaces enhancing soil strength at the microscale, hence most likely contributing to the aging phenomenon observed at the macroscale. Mica surfaces near stressed silica contacts were also found to enhance silica gel growth.

ISBN: 9781303048241Subjects--Topical Terms:

783781
Engineering, Civil.

Growth of Gel Microstructures between Stressed Silica Grains and its Effect on Soil Stiffening.
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502 $a Thesis (M.S.)--Duke University, 2013.
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