Quantitative Assessment of Infrared Analysis of Concrete Admixtures

International Journal of Concrete Structures and Materials

Table 12 Correlation coefficients when using various sources of KBr.

Admixture	Correlation coefficient between mean absorbance and each scan						Weighted mean correlation
	Batch_I		Batch_II		Batch_III
	Scan_A	Scan_B	Scan_A	Scan_B	Scan_A	Scan_B
AIR MIX
KBr_1	0.99602	0.98777	0.98108	0.99597	0.99599	0.99804	0.99445
KBr_2	0.92824	0.93368	0.97729	0.94103	0.88601	0.94646	0.94160
KBr_3	0.80071	0.81516	0.99156	0.97917	0.91420	0.98971	0.95676
Mean correlations from all three KBr’s together = 0.91206
Eucon WR-91
KBr_1	0.93538	0.95819	0.99183	0.99192	0.99169	0.98669	0.98350
KBr_2	0.99847	0.99770	0.99810	0.99517	0.99841	0.98811	0.99709
KBr_3	0.99416	0.99463	0.99846	0.99900	0.99354	0.99332	0.99643
Mean correlations from all three KBr’s together = 0.95018
Daracem 55
KBr_1	0.99757	0.98952	0.99546	0.98027	0.99328	0.99751	0.99419
KBr_2	0.99166	0.99550	0.98988	0.98819	0.98658	0.98115	0.98978
KBr_3	0.95826	0.88033	0.98637	0.99847	0.99583	0.96465	0.98406
Mean correlations from all three KBr’s together = 0.98335
DARAVAIR 1000
KBr_1	0.99952	0.99917	0.99921	0.99734	0.99604	0.99901	0.99878
KBr_2	0.97605	0.99162	0.99725	0.98428	0.97471	0.99794	0.99122
KBr_3	0.97548	0.89556	0.97338	0.96541	0.99832	0.98861	0.98100
Mean correlations from all three KBr’s together = 0.97541
Catexol 1000 R
KBr_1	0.99938	0.98749	0.99702	0.98701	0.99817	0.99891	0.99709
KBr_2	0.99723	0.92215	0.89925	0.90578	0.96812	0.97940	0.96640
KBr_3	0.94225	0.92150	0.99382	0.95925	0.97626	0.96608	0.96868
Mean correlations from all three KBr’s together = 0.97189