Masters Theses


"The work presented is the investigation of the effect of phosphoric acid on the compaction and shear characteristics of pure kaolin. Pure Georgia kaolin clay average particle size of five microns was mixed with different percentages of phosphoric acid. These mixtures were permitted to react for varying periods of time. The results of the study indicate a notable and gradual increase in dry density of the kaolin with increasing percentages of phosphoric acid admixture. The acid admixture ranges from one up to nine percent of the dry weight of the clay. Increase in cohesion of the clay with increase of the percentage of phosphoric acid admixture was observed when the triaxial test for shear failure of the clay was performed with up to nine percent of the acid admixture. The results obtained after two days and seven days curing show the increase in strength of the clay with increased time of curing. It is concluded that the phosphoric acid admixture increases the compaction and shear strength of the clay, also the phosphate fixation takes place in the clay mineral, probably a matter of sorption of phosphate ion by anion exchange with the portion that is fixed being adsorbed in relatively inaccessible position in the clay mineral structure, giving rise to the phenomenon of deflocculation"--Abstract, page 2.


Heagler, John B., 1924-1999

Committee Member(s)

Best, John, 1925-2015
Fisher, Emory D.
Planje, Theodore J., 1919-1980


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering


Missouri School of Mines and Metallurgy

Publication Date



109 pages

Note about bibliography

Includes bibliographical references (pages 107-108).


© 1961 Bhupat Hargovinddas Mehta, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Kaolin -- Analysis
Phosphoric acid
Shear (Mechanics)

Thesis Number

T 1327

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Electronic OCLC #