Sulfate attack of Portland cement-based mixtures containing phosphogypsum

Date of Award




Degree Name

Doctor of Philosophy (Ph.D.)


Civil and Architectural Engineering

First Committee Member

Wen F. Chang - Committee Chair


Sulfate attack of portland cement based mixtures containing phosphogypsum was investigated in this dissertation. Factors affecting sulfate attack, such as phosphogypsum content, cement content and type, curing condition, method of specimen fabrication, specimen size and shape, coarse aggregate and origin of phosphogypsum, were studied with respect to expansion and strength. Two types of sulfate attack, caused by sulfate rich environments and by the presence of gypsum in cement based mixtures, were compared. A theoretical model for predicting compressive properties of cement based mixtures containing phosphogypsum was proposed based on continuous damage theory. The permissible phosphogypsum contents without causing strength loss were derived according to experimental results. Two field tests were conducted for evaluating sulfate attack under weather conditions. The sea water resistance of mixtures was also studied. It was proven that the expansion characteristics of such mixtures can be used to produce a shrinkage compensating mortar. Portland cement based mixtures containing phosphogypsum can be used as construction materials without durability problems, provided that a proper amount of phosphogypsum is used in mixtures.


Engineering, Civil

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