Converting hydration heat to achieve cement mixture with early strength and low hydrating-thermal dissipation

Cement mixture with the properties of early strength and low hydrating thermal dissipation is necessary to cementing the shallow natural gas hydrate formation in deep water area. The research objectives are designed to utilize the energy storage microsphere in cement mixture to achieve early strength and low hydrating thermal dissipation. Considering the strength and hydrating thermal dissipation, the mixture of Class G oil well cement and aluminate cement with the quality ratio of 1:1 is proposed. The polymethyl methacrylate microsphere is used to coat phase change materials to prepare the energy storage micro sphere, which can be used in cement mixture directly and stably. The energy storage microsphere could reduce the hydrating thermal dissipation of cement mixture obviously. Because of converting the hydration heat of Aluminate cement to cure Portland cement and PMMA framework, energy storage micro sphere has little negative effect on the early strength of cement mixture. (C) 2017 Elsevier Ltd. All rights reserved.