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TECHNICAL PAPER
Table 5: Average weight loss of specimens for various exposure periods of acid attack
WEIGHT LOSS (%)
WEEKS GPCT GPCA CC
A B C D E F G H I J K L
1 1.46 1.38 1.33 1.21 1.37 1.41 1.54 1.27 1.75 1.57 1.47 1.44
4 -0.58 -0.73 -0.83 -0.96 -0.76 -0.87 -1.11 -1.23 -0.9 -1.11 -2.26 -3.32
8 -1.67 -1.94 -2.06 -2.31 -1.97 -2.69 -2.69 -2.9 -5.67 -6.47 -7.03 -8.57
12 -2.58 -2.98 -3.56 -3.99 -3.73 -4.14 -4.72 -5.3 -11.88 -12.8 -13.96 -15.65
24 -7.41 -8.35 -8.93 -9.89 -10.09 -11.16 -12.46 -13.67 -21.97 -23.03 -24.22 -25.36
36 -10.68 -11.52 -11.97 -12.66 -14.55 -15.61 -16.63 -17.78 -24.58 -26.23 -28.15 -29.89
52 -11.68 -12.46 -13.08 -13.54 -15.46 -16.56 -17.68 -18.58 -26.26 -28.06 -29.94 -31.28
Table 6: Average weight loss for various exposure periods of sulphate attack
WEIGHT LOSS (%)
WEEKS GPCT GPCA CC
A B C D E F G H I J K L
1 1.62 1.54 1.47 1.52 1.57 1.5 1.51 1.48 1.36 1.5 1.56 1.55
4 1.91 1.83 1.83 1.85 2.01 2.05 2.08 2.1 1.52 1.8 1.85 1.83
8 1.95 1.93 1.89 1.99 2.12 2.15 2.17 2.19 1.22 1.55 0.75 0.52
12 1.97 1.95 1.88 1.94 1.69 1.63 1.55 1.54 0.62 0.68 -0.81 -1.12
24 1.38 0.99 1.00 0.89 0.97 0.42 0.26 0.04 -1.29 -2.39 -4.94 -5.56
36 0.75 0.15 0.04 -0.16 0.11 -0.68 -1.15 -1.48 -3.4 -5.72 -8.57 -9.85
52 -0.46 -0.91 -0.93 -1.07 -1.29 -2.23 -3.07 -3.64 -5.97 -10.06 -13.14 -15.09
5 5
0 0
0 20 40 60 -5 0 10 20 30 40 50 60
-5
Weight loss (%) -10 Weight loss (%) -10
-15
-15
-20 -20
-25 -25
-30 -30
Exposure periods (Weeks) Exposure periods (Weeks)
A-A A-E A-I A-B A-F A-J
S-A S-E S-I S-B S-F S-J
Figure 6: Variation of weight loss due to acid and sulphate attack of mix Figure 7: Variation of weight loss due to acid and sulphate attack of mix
A, E and I B, F and J
5 5
0 0
0 10 20 30 40 50 60 -5 0 10 20 30 40 50 60
-5
Weight loss (%) -10 Weight loss (%) -10
-15
-15
-20 -20
-25
-25 -30
-30 -35
Exposure periods (Weeks) Exposure periods (Weeks)
A-C A-G A-K A-D A-H A-L
S-C S-G S-K S-D S-H S-L
Figure 8: Variation of weight loss due to acid and sulphate attack of mix Figure 9: Variation of weight loss due to acid and sulphate attack of mix
C, G and K D, H and L
THE INDIAN CONCRETE JOURNAL | FEBRUARY 2026 73
