Abstract
Four mixtures of Type I Portland cement, parachlorophenol (pCP), and water were examined by scanning electron microscopy after hydrating for 12 hours, 24 hours, 7 days and 28 days. All mixtures were prepared with a water/cement weight ratio of 0.4. Weight ratios of pCP/cement were as follows: 0, 0.04, 0.1 and 0.2. Fractured surfaces were examined for morphological changes with hydration time and concentration of pCP. In comparison to the control specimens which contained no pCP, pCP specimens exhibited surfaces which were initially more porous due to angular hydration products rather than the acicular products found in the control. As hydration progressed, pCP containing specimens became very dense, with small spherical particles covering the surface. Control specimens became less porous as large unhydrated cement particles dissolved at the expense of very fine grained hydration products; however, the surface was still relatively porous after 28 days of hydration when compared to specimens containing pCP.
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