【摘 要】
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A basic salt (BS) hydrate is a salt that contains a certain amount of both hydroxides and acid radical anions.its molecular formula are Mq(OH)pXr·nn2O or [
【机 构】
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School of Civil Engineering, Central South University, Changsha, 410075, China
【出 处】
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The 14th International Congress on the Chemistry of Cement (
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A basic salt (BS) hydrate is a salt that contains a certain amount of both hydroxides and acid radical anions.its molecular formula are Mq(OH)pXr·nn2O or [(M1)q1(M2)q2...](OH)p(Xi)ri.nn2O in which Mi is metal ion, Xi is acid radical anion.Such BS hydrates as AFt and AFm phases, Friedels and Kuzels salts, etc.play an important role in cement based materials.Even, the main hydration products of several cements with low energy and high performance are BS hydrates, for instance, calcium sulfoaluminate (C(S)A) cement, magnesium oxychloride (MOC) cement and magnesium oxysulfate (o-MO(S)) cement, etc.In this paper, the composition, crystal structure, synthesizing methods, stability and special features of main BS hydrates involving in cementitious materials are reviewed.Meanwhile, the definition of BS cement is first proposed.The formation mechanism of BS hydrates and performance of the BS cements are discussed.The d-MO(S) cement with high strength and excellent durability is introduced.Finally, the principles to develop new BS cements from some multicomponent systems are supposed.
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