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Compressive Strength and Modulus of Elasticity Tests Schedule of the Final Project

57 5-1 After the sand washed using NaOH 3 and kept for 24 hours, the solution is appropriate with the color of Gardner Standard Color No. 8 so that the sand can be used for the experiment. 2. Investigate the amount of mud in sand Fine aggregate should not contain of mud until 5 greater than the density of dry oven. If the mud levels exceed 5, the fine aggregate should be washed because the high value of mud can reduce the bind between fine aggregate and geopolymer paste. So, the quality of the concrete can be bad. The value of the investigation can be seen in Table 5.2. Table 5.2 Investigation of Mud in the Sand. Investigation weight gram Weight of sand A 99 So, the amount of mud in the sand can be calculated as follow: with: W= the amount of the mud in the sand A = the weight of sand after dried in the oven 58 Based on SK SNI S-04-1989-F, fine aggregate cannot have the amount of mud more than 5. If the mud is more than 5 so that the fine aggregate should be washed because the high content of mud will decrease the bond between sand and paste and it makes the quality will decrease. 3. Density and Absorption The result of the density and absorption test of fine aggregate can be seen in table 5.3. Table 5.3 Result of the Density and Absorption Test of Fine Aggregate Information Value A Dry Weight Sample 500 gram B Weight Sample SSD 178 C Weight of Sample from the Oven 482,13 gram D Bulk Density = 2,712 E Bulk Density SSD = 2,812 F Apparent Density = 3,001 G Absorption = 3,701 The fine aggregate is restrained in the sieve no. 4 4.75mm. The weight of the sample is 500gr. From the requirement, the density of the fine aggregate for the normal concrete is around 2.4-3.2 grcm 3 . The density of this test is 59 2.712 . So the sand can be used in the geopolymer concrete. The absorption of the split is 3.701 4. Water Content The water content test of fine aggregate is equal to 1.6635 . The calculation of the water content of fine aggregate can be seen in appendix A.3

5.1.2. Investigate the Coarse Aggregate to Obtain the Result

1. Investigation of the organic matter content. Coarse aggregate shall not contain the mud 1 greater than the density of dry oven. If the mud levels exceed 1, the coarse aggregate should be washed, because of the high levels of mud would reduce bond coarse aggregate in the concrete mix. The investigation value of the mud in coarse aggregate can be seen in Table 5.4. Table 5.4 Investigation of Mud in the Coarse Aggregate Investigation Weight gram Weight of coarse aggregate A 99.3 So, the amount of mud in the sand can be calculated as follow: 5-2

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