Experimental study on properties of pit sand concrete containing the phosphorus slag fine powder;

This paper presents the study on the change of strength and durability,including the mechanical properties,resistance to freezing and thawing,salt attack,permeability,abrasion,carbonation and drying shrinkage of highperformance concrete(HPC)in which the parts of ordinary Portland cement(OPC)are replaced by superfine powder of phosphoric slag (SFPS).

The study shows that, (1) Adding 10% super-fine powder of steel slag to concrete, strength and permeability of the concrete can be improved obviously as lubrication and filling effect of the steel slag powder functioned; (2) The super-fine powder of mineral slag, 453 m2/kg in spec.

The influencing factors, such as the dosage of high fineness blust furnace slag powder (HBP), water cement ratio (w/c),are analyzed,and the mechanism of raising concrete strength by using HBP is discussed.

Ready mixed concrete of ground granulated slag in precast members;

The early hydration activation of pulverized slag powder, Class C fly ash and Class F fly ash were determined and analyzed systematically by the Environmental Scan Electron Microscope (ESEM) and the TG-DTA.

The carbonation depths of the pulverized slag powder mortar,flyash mortar and slag\|flyash combination mortar are measured systematically.

A quantitative mathematics function about the relationships between the compressive strength of the concrete and the compositions of ternary blended binders of cement-pulverized slag powder-superfine class F fly ash was educed by means of simplex-centroid experimental design.