コンクリート用混和材の評価への全微分的な考え方の導入およびその適用例

抄録

Many kinds of approaches have been studied to produce high-performance concrete. Such concrete is required to have high-strength, durability, and flowability. In general, some kinds of chemical or mineral admixtures are used to attain these properties, but it is very difficult to obtain the mix proportions such as to get high-strength, durability and flowability at the same time. In the field work, however, it is unnecessary to satisfy all properties at the same time.
In this paper, a method to decide a reasonable replacement ratio of mineral admixtures to produce high-performance concrete is proposed and investigated. This method is based on the principle of total diffrential. In this principle, the objective functions are compressive strength and/or flowability (slump or slump flow), and the independent variables are the replacement ratio of admixtures, water cement ratio, and/or water content. Furthermore, the applicability of this method is investigated for the case of silica fume concrete. It can be shown that this proposed method is very useful and has a great possibility of other application.