Abstract
The relationship between the cement hydration and the strength and durability of concrete has been studied by many researchers. The model representing the development of strength of concrete with cement hydration is proposed. Many models show the relationship between the strength and porosity, but the analytical method based those cement hydration model is not proposed.
In this paper, a cement hydration model considered area of cement hydration is introduced to visco-elasto-plastic suspension element method which is used for applying to the failure analysis of hardened concrete. This cement hydration model is a simple one which the area of cement hydration is yielded around nodal point and increased with cement hydration. The characteristic of this study is that the fracture analysis can be carried out by using the model structured this method. The relationship between compressive strength and tensile strength of cement-based material and distance of cement hydration by using this improved analytical method is investigated.
As the results, compressive strength and tensile strength are increased with increasing distance of cement hydration. However, the increasing rate is different between compressive strength and tensile strength, and brittleness index is increased with increasing distance of cement hydration. Those analytical results can express previous knowledge of concrete, that is, this analytical model is possible to apply to the investigation of strength development of cement-based material. Further more, the effect of number and radius of cement nodal point on strength development is investigated.
