Mixture Proportioning of Expansive Cements

波特兰水泥是建筑业中使用最广泛的材料之一。其固有特征之一是干燥时收缩，这可能会导致裂缝的形成。为了应对这一担忧，几十年来，膨胀型水泥一直在该领域得到开发和使用。当与水混合时，膨胀水泥会膨胀，并在钢筋中产生拉应力。这会在混凝土中产生压应力，从而降低裂缝的可能性。然而，目前制备膨胀水泥的程序是基于试验和错误的。本研究的目的是评估膨胀水泥的物理化学、微观结构和微观机械性能。为了解膨胀水泥的力学性能，本研究采用数值模拟和试验评价相结合的方法。

Portland cement is one of the most widely used materials in the construction industry. One of its inherent characteristics is shrinkage upon drying which may lead to formation of cracks. In response to this concern, expansive cements have been developed and used in the field for several decades. When mixed with water, expansive cements expand and create tensile stresses in the reinforcing steel. This generates compressive stresses in the concrete which reduced the cracking potential. However, the current procedure for preparation of expansive cements is based on trial and error. The objective of this research is to evaluate the physico-chemical, microstructural, and micromechanical properties of expansive cements. The research consists of both numerical modeling and experimental evaluation to obtain an understanding of the mechanical properties of expansive cements.