What Is Aggregate Impact Value Test

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3.2.3.6 Aggregate Impact Value test as per IS: 2386- 4 (1963) This test was performed to determine the aggregate impact value of coarse aggregates. Impact testing machine was used. Cup of the machine was firmly fixed. Sample was placed in it and compacted with the help of tamping rod. 15 blows of hammer were given from 380 mm height. Sample is then sieved from 2.36 IS sieve. Material retained was weighed. Table 3.17:- Aggregate Impact Value Result Observations Sample 1 Sample 2 Weight of dry sample (W1) [in gm] 350 350 Material passing 2.36mm IS sieve(W2) [in gm] 60 55 Aggregate Impact Value = W2/W1×100 17.14% 15.71% Specified value of Aggregate Impact Value Nature of stone Aggregate value Exceptionally …show more content…

Figure 5:- Impact Testing Machine 3.3 Mix Design for M30 Grade of Concrete as per IS: 10262 (2009) 3.3.1 Data for mix proportioning Grade of concrete M30 Type of Cement : Ordinary Portland cement (Birla Cement) Maximum nominal size of aggregate : 20 mm Minimum cement content : 300 kg/m3 Maximum cement content : 450 kg/m3 W/C ratio : 0.47 Workability : 80 - 100 mm (Slump) Exposure condition : Mild Specific gravity of cement : 2.98 Specific gravity of coarse aggregate : 2.87 Specific gravity of fine aggregate : 2.66 Water absorption of CA : 0.13% Water absorption of FA : 1.7% Target mean Strength f’ck = fck + 1.65 x …show more content…

Slump test was conducted to determine the workability of concrete. From each mix nine cubical specimens of dimension 150 × 150 ×150 mm were casted for determination of compressive strength and two beams of dimension 500×100×100 mm were casted for determining flexural strength. Specimens were compacted by means of vibration machine and tamping rod. Strength of cubes and beams were tested after 3 days, 7 days, and 28 days. Figure 8:- Casting of Cubes Figure 9:- beam mould for casting 3.7 Compaction of test specimens Compaction was done as per IS 516: 1959. The moulds were filled with concrete in three layers and after every layer compaction was done with the tamping rod by tamping 25 times. After complete filling moulds were compacted using vibration machine to ensure a symmetrical distribution of concrete. 3.8 Curing of test specimens After casting moulds were kept in concrete laboratory at room temperature for 24 ±1/2 hrs at a place free from vibrations. After 24 hrs sample were removed from moulds and marked for later identification. Then sample was stored in clean water at room temperature till the testing of

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