Experimental Research on Foamed Mixture Lightweight Soil Mixed with Fly-Ash and Quicklime as Backfill Material behind Abutments of Expressway Bridge

Table 3

Chemical compositions of cement and fly-ash.

Chemical constituents	Cement (%)	Fly-ash (%)
Silicon dioxide/silica (SiO2)	20.32	57.2
Aluminium oxide/alumina (Al2O3)	4.86	29.1
Ferric oxide (Fe2O3)	4.99	4.3
Calcium oxide (CaO)	65.45	1.5
Magnesium oxide (MgO)	1.25	2.8
Sodium oxide (Na2O)	0.15	3.2
Potassium oxide (K2O)	0.40	1.2
Sulphur oxide (SO3)	2.10	0.7