Abstract
Synopsis Some pastes and mortars when thoroughly dry have high electrical insulation resistance. During studies on methods of winding coils, pastes of ordinary Portland cement and ethylene glycol were investigated. When such pastes are heated, the solvent partially evaporates, leaving a strong, rigid, porous solid which on subsequent hydration absorbs some 25% of water and increases further in strength. Scanning electron-micrographs show that this material consists of a mass of interlinking fibrous crystals—a completely different morphology from that seen in normal hydrated pastes.
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