Thermodynamics about Feldspathic Mineral Resolution and Effect in Alkali-Aggregate Reaction

The resolution reaction in alkali solution of feldspathic mineral,such as potash feldspar,albite and nepheline,is studied by thermodynamics,and the possibility of alkali released from feldspathic mineral and the effect to AAR are analyzed also.It is indicated that the variety of alkali content in solution influenced the alkali amount released from feldspathic mineral stronger than the variety of curing temperature.It is proved that feldspathic mineral was stable followed the hydration of low-alkali content cement in concrete and no alkali could be released from it,but when using high-alkali content cement in concrete,feldspathic mineral would be decomposed and released alkali from it,which would increase the alkali content in concrete and initiate the alkali-aggregate reaction.