肯特assignment代写:波特兰水泥

Keywords:肯特assignment代写

波特兰水泥是最常见的水泥类型，由石灰、硅石和氧化铝组成。所有这些成分在自然界中都很容易以粉笔和粘土的形式存在。水泥是在高温（约1500°C）的湿法或干法。它基本上是由混合的地面组件和进料旋转窑反对横流的热空气。随着混合物的下降，随着温度的升高，它会发生一系列的反应。水蒸发了。然后，当它变得更热的粉笔是分解为生石灰。在1500°C时，最终熔合发生，所有组分熔化并共同反应形成水泥熟料。将熟料冷却并研磨成水泥粉末。粉中加入一些石膏，波特兰水泥准备使用。
形成混凝土，水在水泥中加入控制量。水泥与水的反应（水化）形成稠膏具有一定的凝聚力，但仍然可塑甚至浇注。在这个阶段热的演变，这个阶段被称为设置。设置是混凝土仍然可行的阶段。之后，硬化开始。

肯特assignment代写:波特兰水泥

Portland cement is the most common type of cement and consists of lime, silica and alumina. All these ingredients are readily available in abundance in nature in the form of chalk and clay. Cement is made at high temperature (about 1500°c) by either a wet process or a dry process. It basically consists of mixing the ground components and feeding into a rotary kiln against a cross flow of hot air. As the mixture come down, it undergoes a series of reactions as the temperature increase. The water is evaporated. Then, as it becomes hotter the chalk is decomposed to give quicklime. At 1500°c, the final fusion takes place and all the constituents melt and react together to form the cement clinker. The clinker is cooled and ground to form cement powder. Some gypsum is added to the powder and the Portland cement is ready for use.
To form concrete, water is added to cement in controlled amount. The cement reacts to the water (hydration) to form a thick paste which has some cohesion but still mouldable and even pourable. At this stage heat is evolved and this stage is called setting. Setting is the stage when the concrete remains workable. After that, hardening starts.

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