concrete, usually called as the most useful building material in the global infrastructure development. Early the 19th century was the first using of reinforced concrete more intensively altough the Greeks and Roman have done. In 1801, F. Coignet launched his writing about construction concepts by observed the weakness of this material to the pulls. Concrete become the choice for stucture enggineering because of its advantages, such as easy to get material, easy in processing, easy to set it up for the structural and architectural needs according to the design needs, the better resistance of high temperature or in case of fire, the deformation behaviour that stiff, the low cost that can minimize the project cost. In the last of three decade, high quality concrete become more useful and it is used frequently for modern building structure needs in developed countries, that commonly caused by building structural operation. Structural operation means good behaviour at service situation altough at ultimate situation. At service situation, stiffness, bentness, and crack behaviour become so important; at ultimate situation, its power and elasticity will determine the resistence of concetrete structure; and at long term, its density, permeability, and capillarity will determine the long term duration of concrete. Considering those problems, in concrete mix design, it is important to give more attention to accuracy factors to solve those problems. One of solution that may offered is software which is created for concrete mix design so the calculation error caused by human error could be minimized even avoided. With the help of this simple software, hope we can save the processing time, give more accuracy in calculation,and also we can produce the concert with determined characteristic.

concrete, usually called as the most useful building material in the global infrastructure development. Early the 19th century was the first using of reinforced concrete more intensively altough the Greeks and Roman have done. In 1801, F. Coignet launched his writing about construction concepts by observed the weakness of this material to the pulls. Concrete become the choice for stucture enggineering because of its advantages, such as easy to get material, easy in processing, easy to set it up for the structural and architectural needs according to the design needs, the better resistance of high temperature or in case of fire, the deformation behaviour that stiff, the low cost that can minimize the project cost. In the last of three decade, high quality concrete become more useful and it is used frequently for modern building structure needs in developed countries, that commonly caused by building structural operation. Structural operation means good behaviour at service situation altough at ultimate situation. At service situation, stiffness, bentness, and crack behaviour become so important; at ultimate situation, its power and elasticity will determine the resistence of concetrete structure; and at long term, its density, permeability, and capillarity will determine the long term duration of concrete. Considering those problems, in concrete mix design, it is important to give more attention to accuracy factors to solve those problems. One of solution that may offered is software which is created for concrete mix design so the calculation error caused by human error could be minimized even avoided. With the help of this simple software, hope we can save the processing time, give more accuracy in calculation,and also we can produce the concert with determined characteristic.

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