Abstract
The development of concrete construction increased gradually, so that it affects the increasing on the cement use. Cement production contributes to produce gas emissions (CO2) which can cause environmental issue. Therefore, alternative materials are needed to use in reducing the using of cement, the aim of this research was to generate the green concrete. Corncob is one of the agricultural waste. In addition, to support green concrete, this research also used cement less than 500 kg/m3. The number of cement will substitute by Corncob Ash (CCA) partially with variations are 0%, 2.5%, 5%, 7.5%, 10%, 12.5%, 15% and 17.5% counted as recently cement weight. The using of specimen consist of diameter 150 mm and height 300 mm. The needed of compressive test each variations made of 3 concrete cylinder samples for testing at 7, 14 and 28 days. Based on the results, it can be seen that CCA is able to supply increasing on concrete compressive strength. So that, CCA can be proposed partially as a cement substitutional.
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