Measurement of Pozzolanic Activity Index of Scoria, Pumice, and Rice Husk Ash as Potential Supplementary Cementitious Materials for Portland Cement

Table 5

Factors influencing compressive strength (MPa).

Independent variable	Pillai trace	Approx.	Num DF	Den DF	value
Materials	0.29584	4.2854	5	51
Temperature	0.18776	2.3579	5	51
Fineness	0.28073	3.9811	5	51
Replacement	0.58722	14.5108	5	51

, , and ns = nonsignificant ().