SUBJECTS efflorescence

We subjected specimens of Indiana Limestone to this test, but by forcing the solution into pore space by the use of a vacuum pump. We determined that the grains began to dissociate in the second cycle immediately after the specimen had been placed in the solution 0.68% salt — by wt. of dry specimen — was adequate to cause the failure of the stone. A repeated cycling of much lesser quantity of an efflorescence such as calcium sulfate as given in Table III shall be adequate to cause disruption of stone structures. 

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