Experimental Study on the Properties of Cement Mortar and Concrete without Clinker Cementitious Materials
Slag,fly ash,steel slag,iron tailings powder,slaked lime,desulfurization gypsum,etc.,are applied as raw materials to study the preparation of non clinker cementitious materials and the properties of mortar and concrete.The experimental results indicate that the standard consistency water consumption of non clinker cementitious materials is between 28.5% and 30.5% ,and the initial setting time is greater than 150 min,while the final setting time ranges from 200 min to 460 min;The type Ⅰ non clinker cementitious material without adding cement is used.The general mortar with high steel slag content has a higher early compressive strength,and its special mortar also has a higher compressive strength that can reach 50 MPa at 56 d;P·Ⅰ type Portland cement with no more than 5% cementitious materials is a Class Ⅱ non clinker cementitious material.The compressive strength of general and specialized cementitious sand with low steel slag content and high gypsum content is relatively high.The compressive strength of the superior group's special mortar can reach 35 MPa after 28 d and 45 MPa after 56 d;The concrete test was conducted using a cementitious material ratio with better mortar strength.The concrete without clinker cementitious material showed good workability,and the compressive strength at 28 d met the strength requirements of C20-C25 concrete,while the compressive strength at 56 days met the strength requirements of C25-C30 concrete.
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