The Effect of Two Organic Compounds on a Portland Cement-Based Stabilization Matrix

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Abstract
The morphology of hydrated Portland cement with and without the addition of either ethylene glycol or p-bromophenol was investigated. The organic compounds were added to create organic to cement weight ratios of 0.02 to 0.2. Samples were hydrated at 21-25°C for 12 hours to 3 months. It was found that EG caused greater changes in the cement microstructure than the PBP. EG samples exhibited surfaces with grainy and nodular formations instead of the more dense surface with crystalline features characteristic of the control samples. X-ray diffraction patterns also showed a lack of crystalline formation in the EG samples. The PBP samples showed little deviation from the control samples except at the highest loading. The difference in effect may be due to the smaller molecular size of EG making it more able to substitute for the water of hydration and cause deformation of the hydration products normally formed.

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