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

Table 3

Temperature effects on chemical composition and physical properties of the materials used.

Sample	SiO2	Fe2O3	Al2O3	Basic oxide	CaO	Alkali	MgO	L.o.I	Specific gravity	Specific surface area
	[%]	[%]	[%]	[%]	[%]	[%]	[%]	[%]		m^2/kg
S 900	41.6	15.1	13.4	70.1	10.1	4.2	5.43	5.01	2.95	325
S 800	43.4	14.8	15.6	73.8	10.5	3.64	5.43	1.47	2.96	314
S 700	45.3	14.6	12.9	72.8	10.2	3.16	5.46	3.52	2.97	333
S 600	44.5	15.2	12	71.7	10.3	3.3	5.04	5.05	3.04	456
S-N	40.0	13.9	13	66.9	9.6	3.15	4.62	10.76	2.93	575
P 900	63.1	4.48	15.9	83.48	0.62	10.25	0.27	4.18	2.50	369
P 800	57.3	4.56	16.6	78.46	1.24	11.23	0.26	7.45	2.41	479
P 700	55.0	4.42	15.6	75.02	0.8	10.82	0.24	10.32	2.43	447
P 600	56.6	4.56	17.5	78.66	1.27	11.7	0.31	6.2	2.43	573
P-N	55.4	4.64	16.4	76.44	1.7	10.79	0.62	8.78	2.39	506
RHA 900	88.8	0.44	0.32	89.56	0.65	2.02	0.24	6.07	2.28	282
RHA 800	92.4	0.49	0.38	93.27	0.8	2.42	0.3	2.13	2.21	300
RHA 700	94.7	0.24	0.29	95.23	0.55	2.35	0.35	0.21	2.15	309
RHA 600	94.25	0.26	0.33	94.84	0.63	2.51	0.28	0.56	2.14	462
RHA-uc	93.5	0.53	0	94.03	0.67	2.65	0.38	0.86	2.17	611