Experimental Study and Microscopic Analysis on Frost Resistance of Iron Ore Tailings Recycled Aggregate Concrete

Table 1

P.O 42.5 cement quality parameters.

Quality parameter index	Detection value	Standard value	Quality parameter index	Detection value	Standard value
Specific surface area (m^2/kg)	348	≧300	Chloride ion (%)	0.012	≤0.06
Sulphur trioxide (%)	2.4	≤3.5	Loss on burn (%)	1.6	≤5.0
Final setting time (min)	220	≤600	Magnesium oxide (%)	2.0	≤5.0
Safety and security	Qualified	Qualified	Initial setting time (min)	145	≥45