Engineering Systems Analysis: Concrete mix design example скачать в хорошем качестве

Engineering Systems Analysis: Concrete mix design example

Problem 5 at the end of Chap 1 'Explaining Systems Analysis' by Revelle, Whitlach & Wright describes a common problem in concrete mix design. Although the problem description does not call for a mathematical representation, this video constructs a simplified linear programming model to optimize the production of portland cement concrete. One constraint that is not represented in the video is the necessity of using only those volumes of sand, gravel, and water that are stockpiled at the batch plant. In my experience, these are rarely active constraints for any batch plant operator (although they could be modeled as such). Should raw materials be unconstrained, then the contractor would choose to maximize production of all 3 mixes, subject to the constraint that production must be less than or equal to market demand. However, if there is a risk of running out of one raw material of another, then the contractor would choose to maximize profit by using the available raw materials in the most profitable mix design first.