Bond Stress between Steel-Reinforced Bars and Fly Ash-Based Geopolymer Concrete

Table 1

Chemical composition of each fly ash sample as determined by XRF (quantitative results).

Fly ash batches	CFA 1	CFA 2
Component	wt.%	wt.%
SiO2	58.491	57.360
Al2O3	21.046	22.106
Fe2O3	8.286	8.126
CaO	3.843	4.701
K2O	3.938	3.090
TiO2	2.232	2.445
SO3	1.282	1.098
SrO	0.340	0.489
ZrO2	0.226	0.263
MnO	0.158	0.189
Rb2O	0.045	0.053
Y2O3	0.032	0.043
LOI	1.6	0.91
SiO2/Al2O3 (wt)	2.78	2.59