Statistical Analysis of the Tensile Strength of Coal Fly Ash Concrete with Fibers Using Central Composite Design

Table 1

Chemical properties of the coal fly ash from thermal power plant Holboca.

Coal fly ash
Element	Wt%	At%
CK	17.15	26.89
NK	01.34	01.80
OK	37.50	44.13
NaK	00.69	00.56
MgK	00.52	00.40
AlK	13.09	09.14
SiK	18.37	12.32
SK	00.70	00.41
KK	01.74	00.84
CaK	03.17	01.49
TiK	01.71	00.67
FeK	04.01	01.35
Matrix	Correction	ZAF

Note: Wt is mass percentage and At is the atomic number; K represents the layer to which the chemical properties were determined.