Mixture Proportioning of Expansive Cements

膨胀水泥配合比

• 批准号: 8703582
• 负责人: Menashi Cohen
• 金额: $ 17.87万
• 依托单位: Purdue Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1990-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8703582&HistoricalAwards=false
• 关键词: Mixture; Proportioning; Expansive; Cements

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.

波特兰水泥是建筑行业中应用最广泛的材料之一。它的固有特性之一是干燥后收缩，这可能导致裂缝的形成。为了解决这一问题，膨胀水泥已经被开发和应用了几十年。当与水混合时，膨胀的水泥膨胀并在钢筋中产生拉应力。这在混凝土中产生压应力，从而降低了开裂的可能性。然而，目前制备膨胀水泥的方法是基于反复试验。本研究的目的是评估膨胀水泥的物理化学、微观结构和微观力学性能。为了了解膨胀胶结物的力学特性，研究包括数值模拟和实验评估两方面。