Also described are the cementitious products of this method and the cement composition which includes aluminous cement and ammonium polyphosphate.Ī method is described for making a rapid-setting phosphate-bonded cementitious material. to form a crystal-containing phosphate-bonded material. The mixture is allowed to set to form an amorphous cementitious material which also may be hydrothermally treated at a temperature of from about 120.degree. A powdered aluminous cement is mixed with an aqueous solution of ammonium phosphate. Phosphate-bonded calcium aluminate cementsĪ method is described for making a rapid-setting phosphate-bonded cementitious material. Radiolysis calculations are also provided in a separate document. Information concerning access points into the P-Reactor vessel and amount of aluminum metal in the vessel is provided elsewhere. A less alkaline material (pH 10.5) was desired to address a potential materials compatibilitymore » issue caused by corrosion of aluminum metal in highly alkaline environments such as that encountered in portland cement grouts. In addition, blended calcium aluminate - calcium hemihydrate cement compositions can be formulated such that the primary cementitious phase is a stable crystalline material. Blended calcium aluminate - calcium hemihydrate cement-based grout was identified as candidate material for filling (physically stabilizing) the 105-P Reactor vessel (RV) because it is less alkaline than portland cement-based grout which has a pH greater than 12.4. The objective of this report is to document laboratory testing of blended calcium aluminate - calcium hemihydrate grouts for P-Reactor vessel in-situ decommissioning. Using the density data, the elastic moduli namely Young's modulus, bulk and shear modulus show strong linear dependence as a function of compositional parameter.īLENDED CALCIUM ALUMINATE-CALCIUM SULFATE CEMENT-BASED GROUT FOR P-REACTOR VESSEL IN-SITU DECOMMISSIONINGĭOE Office of Scientific and Technical Information (OSTI.GOV) The density of the present CAS decrease with aluminates presents in the cement. In the present paper for the first time we have shown theoretical density and elastic constants for various calcium aluminate cements. Density and mechanical properties of calcium aluminate cementĪhmed, Syed Taqi Uddin Ahmmad, Shaik KareemĬalcium aluminate cements are a special type of cements which have their composition mainly dominated by the presence of Monocalcium Aluminates.
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