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CHAPTER IV
RESULT ANALYSIS AND DISCUSSION
4.1 Foamed Concrete Materials
4.1.1 Fine Aggregate Test
From the test result found that fine aggregate water absorption is 3.72, whereas the maximum limit is 5, its mean that this fine aggregate has been good enough for concrete
mixture design or it has met the standard requirement. So this fine aggregate can be used because the absorption no more than 5. The test result that has conducted on the sample specimen of
fine aggregate, which will be used as a concrete material composer as shown in Table 4.1. Table 4.1 Fine aggregate test result
No. Test Type
Result Standard
1 Sludge level
3.50 Max 5
2 Bulk specific gravity SSD
2.56 2.5
– 2.7 3
Absorption 3.31
- 4
Fineness modulus 2.87
2.3 – 3.1
It is shown in the table 4.1 that the mud content of fine aggregate is 3.5 and less than 5, mean that the fine aggregate is good and ready to be used in the mix design without prewashing.
This is lower than the water absorption is 3.63, then the aggregate in wet circumstances and to achieve a state of the SSD. Figure 4.1 and table 4.2 shows the gradation of fine aggregate that
has meet the standard requirement for mixture and the value is between maximum value and minimum value.
Table 4.2 Gradation of Fine Aggregate
Sieve Size mm
Blocked Passing
Cumulative Standard
Weight gr Percentage
Cumulative
9.5 100
100 4.75
101 3.37
3.37 96.63
95-100 2.36
321 10.72
14.09 85.91
80-100 1.18
500 16.70
30.79 69.21
50-85 0.85
675 22.55
53.34 46.66
25-60 0.3
1089 36.37
89.71 10.29
10-30 0.15
185 6.18
95.89 4.11
2-10 Pain
123 4.11
100
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Total 2994
100 387.21
Figure 4.1 Fine aggregate gradations
4.1.2 Coarse Aggregate Test
From the test result found that fine aggregate water absorption is 3.67, whereas the maximum limit is 5, its mean that this fine aggregate has been good enough for concrete
mixture design or it has met the standard requirement. This shows aggregate ability to absorb water in a state of absolute dry until dry saturated at 3.67 of the dry weight of the aggregate
itself. So this fine aggregate can be used because the absorption no more than 5. The test result that has conducted on the sample specimen of coarse aggregate, which will be used as a
concrete material composer as shown in Table 4.3. Table 4.3 Coarse Aggregate Test Result
No. Test Type
Result Standard
1 Abrasion
25,6 Max 50
2 Bulk specific gravity SSD
2.68 2.5
– 2.7 3
Absorption 3.67
- 4
Fineness modulus 7.84
5 – 8
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This abrasion test of concrete in the laboratory is to obtain concrete abrasion coefficient. The test result value is the value of the concrete surface resistance of a building component of
water that can be used as a comparison with the value of the coefficient of abrasion on the building due to abrasion flow that transports sediment. The test result is 25.6 and the limit is
50 that is mean this already meet the standard condition. Figure 4.2 and table 4.4 shows the gradation of coarse aggregate has meet the standard requirement for mixture and the value is
between maximum value and minimum value. Table 4.4 Gradation of Coarse Aggregate
Sieve Size mm
Blocked Passing Cumulative
Standard Weight gr
Percentage Cumulative
38 100
100 25
100 95-100
19 79
2.65 2.65
97.35 90-100
12.5 1662
55.79 58.44
41.56 -
9.5 427
14.33 72.78
27.22 20-55
4.75 811
27.22 100
0-10 2.36
100 0-5
Pain 100
Total 2979
100 433.87
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Figure 4.2 Coarse Aggregate Gradation
4.2 Lightweight Foamed Concrete