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Table 1 Properties of cement.

From: RETRACTED ARTICLE: Research on Construction Risks and Countermeasures of Concrete Dam

Properties   Cement Fly ash
Chemical composition (% by mass) SiO2 23.24 50.6
Al2O3 4.07 27.1
Fe2O3 3.02 7.1
CaO 61.64 4.5
MgO 4.74 1.2
SO3 2.05 0.3
Alkali content 0.45 1.3
Loss on ignition 1.08 4.4
Mineral composition (% by mass) C3S 32.4 Vitreous body (54%)
C2S 47.5 Quartz (26%)
C3A 0.2 Mullite (17%)
C4AF 14.6 Magnetite (1.8%)
Gypsum 3.5 Hematite (0.2%)
Physical properties Specific gravity (g/cm3) 3.20 1.8
Specific surface (m2/kg) 319 1390
Compressive strength (MPa) 7 days 21.3
28 days 48.4