【摘 要】
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Cement slurries have been designed to remain liquid for extended periods of time (>weeks) until exposed to neutron or ionizing radiation to provide a triggered activation mechanism.The cement setting
【机 构】
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Halliburton, Houston 77382, USA Research Triangle
【出 处】
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The 14th International Congress on the Chemistry of Cement (
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Cement slurries have been designed to remain liquid for extended periods of time (>weeks) until exposed to neutron or ionizing radiation to provide a triggered activation mechanism.The cement setting occurs in two stages.First, a triggered setting of an aqueous monomer phase forms a stiff gel;then, the gel hardens further and develops strength by cement hydration.This paper will describe the design and results of this initial work detailing the rheological behavior and mechanical outcome of exposing this cement system to 14 MeV neutron radiation from a Cockcroft-Walton D-T accelerator as well as ionizing sources such as gamma radiation.The triggered response of this system with relation to neutron energy and admixtures used in the cement design to impart direct response will be discussed.Particular details will be presented relative to usage of commercially available neutron generators of various designs to produce neutrons of different energy levels.Additionally,corresponding Co-60 gamma radiation and Boltzmann distributions of neutron energies will be included as energy sources.Correlations between energy output, calculated energy absorption, and cement response will summarize the effects of this ionizing radiation on cement slurries containing admixtures designed to respond to such exposure.
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