CaO-Al2O3-P2O5三元体系中胶凝材料的设计、制备与水化

Design,Preparation and Hydration of Cementitious Materials Developed from CaO-Al2O3-P2O5 System

在CaO-Al2O3-P2O5三元体系中设计了以磷铝酸钙、铝酸钙和磷酸三钙为矿相组成的磷铝酸盐水泥熟料,并利用溶胶凝胶法、高温固相反应法制备了不同矿相含量的系列熟料,定量分析了熟料的矿相含量,测试了净浆凝结时间和抗压强度,分析了水化硬化浆体的微观结构.结果表明:磷铝酸盐水泥熟料水化凝结时间正常,磷铝酸钙含量越高,凝结时间越短;其水化硬化试件具有高强早强的特性,早期和后期强度都较高;磷铝酸盐水泥硬化浆体微观结构致密,在28d内水化产物主要为水化铝酸钙(C2AH8)、CaO-Al2O3-H2O凝胶、CaO-Al2O3-P2O5-H2O凝胶;磷铝酸盐水泥熟料中实际所含矿相含量与设计相符,证明熟料设计思路可行,为开发新型胶凝材料提供了新设计思路.

A novel aluminophosphate cement clinker consisting of calcium aluminophosphate,calcium aluminate and tricalcium phosphate was designed and developed in the CaO-Al2O3-P2O5 system.A series of clinkers with different mineral contents was prepared by sol-gel method and high temperature solid reaction process.The mineralogical content of clinker was quantitatively analyzed.The setting time and compressive strength were tested,and the hydration products and hydration hardened paste were analyzed.The results show that the hydration time of the cement clinker is normal,and the higher the content of calcium phosphate aluminate,the shorter the setting time.The hardened specimens have the characteristics of high strength and early strength.The strength at early and late stages of development is higher.The hardened cement paste has a dense microstructure,and the hydration products include calcium aluminate hydrate(C2AH8),CaO-Al2O3-H2O gel,and CaO-Al2O3-P2O5-H2O gel within 28 days.The actual mineral phase contents of the prepared cement clinker are the same as the designed content,which proves that the clinker design idea is feasible,and the study provides a design idea for the development of new cementitious materials.