Optimal Mix Design and Mechanical Properties of Rapid-Hardening Foam Concrete

Table 2

Factor levels of the orthogonal experimental design.

Factor levels	Fast-hardening sulfoaluminate cement dosage (factor α) (%)	Foam content (factor β) (%)	Water-to-cement ratio (factor γ)	Superplasticizer content (factor δ) (%)
1	100	3.8	0.5	0.1
2	50	4	0.55	0.12
3	0	4.2	0.6	0.14