Workability For Concrete Specimens Finance Essay

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The results of compressive strength for concrete reinforced by adding 2.5 of wastes cigarette butts (W.C.B) by volume are present in this chapter. In this study, three type of mixing concrete mixes will be designed for constant grade 30 but using different percentage of water to cement ratio (w/c). The w/c is 0.55, 0.60 and 0.65 were conducted.

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In this present study, there are attempt in utilize of cigarette butts in fired clay bricks conducted by Aeslina et al., 2010. Four variables of mixing are using different percentages of cigarette butts which are 0%, 2.5%, 5.0% and 10.0% by weight. The compressive strength test shows that the strength decreases with the increasing proportion of cigarette butts. The compressive strength test determines the maximum load that the specimen could sustained over cross sectional area at ages 134 days.

Workability for Concrete Specimens

Workability test include slump test, vebe test and compacting factor test. In this study, each of the tests was conducted to test three types of mix which have w/c 0.55, w/c 0.60 and w/c 0.65 and a control mix of w/c 0.55. The results of all the tests were tabulated in Table 4.1, Table 4.2 and Table 4.3 respectively.

Slump Test for Concrete Specimens

Table 4.1 shows the result of slump test for three types of different w/c specimens with constant amount of W.C.B and a control mix specimen that without the W.C.B contents. Control mix specimen gave a 70mm of slump which is the lowest slump value compare to the other specimens that mixed with W.C.B. For specimens with w/c 0.55, w/c 0.60 and w/c 0.65, their slump values were 85mm, 120mm and 150mm respectively. It was shown that the w/c of 0.65 has the highest slump and highest workability in this study. Figure 4.1 illustrated the result of slump test for different mix specimens. Table 4.1: Results of Slump Test for Different Mix Specimens Water to Cement Ratio (w/c) Slump (mm) Control Mix 70 0.55 85 0.60 120 0.65 150 Figure 4.1: Results of Slump Test for Different Mix Specimens

Vebe Test for Concrete Specimens

Table 4.2 shows the results of Vebe test for three types of different w/c specimens with constant amount of W.C.B and a control mix specimen without the W.C.B content. There was 3.20seconds of Vebe obtained for the control mix specimen, which is the highest among other specimens. For w/c 0.55, there is 3.05s while for w/c 0.60, 2.70s was obtained. Specimen with w/c of 0.65 has the lowest Vebe which has only 2.25s which has the highest workability. Figure 4.2 illustrated the result of Vebe test for different mix specimens. Table 4.2: Results of Vebe Test for Different Mix Specimens Water to Cement Ratio (w/c) Vebe (s) Control Mix 3.20 0.55 3.05 0.60 2.70 0.65 2.25 Figure 4.2: Results of Vebe Test for Different Mix Specimens

Compacting Factor Test for Concrete Specimens

Table 4.3 shows the results of compacting factor for three types of different w/c specimens with constant amount of W.C.B and a control mix specimen without the W.C.B content.

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