Calcium aluminophosphate cements

Abstract

A family of cement compositions containing calcium and phosphate is disclosed. The calcium is present in the starting material as calcium-containing oxides such as calcium silicates, calcium aluminates, calcium aluminosilicates, and glasses comprising calcium and silica. The phosphate is present as one or more polyphosphate species, such as triphosphate and metaphosphate. The polyphosphate is dissolved in water and mixed with the calcium-containing starting material, after which it sets to form a hard, durable concrete. These concretes offer improved performance over Portland cement, such as improved strength and chemical resistance. A particular feature of these cements is improved bonding of the setting cement with calcium-containing reinforcing materials or aggregates, such as limestone, granite, and fiberglass. Other features include the lower CO2 emission involved in cement manufacture vs. Portland cement, and the ability of the calcium phosphate hydrogel formed upon setting to sequester many radionuclides, including those present in nuclear reactor waste.

Description

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Claims

ca.m: o cemeonsaoues w mae araeaosrme mxn an aueous souon conann a source o .r moaeorsaos aaseanes c, s maeem one cacum-conann oxe. o ecaeoasro cmoane,ae annsro auexe caaosmnes onasen soosu orceao oeoosoase,are, aons saae, .ro muae croans assnn c oa smounm w,ocassuem,o aosae coun.erons seecerome . maera asn camn wceon aomsmoaneusm. . maera asn camn wc aeas one oronosae4. a cacum-conann oxes a cacum .u ro mm uanea cre oa. ns assnn c oaman w,ca aeas, onae cac,uma aumnae, asn seeacerom.e . maera asn cam1n1w19c24 47 121433 326conssn oa3, anore,eee cnaec,u amn-conasasn conna oxnnesa se.eceromerou