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HIGH SCHOOL

Engineering

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Civil Engineering

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Introduction to Concrete

Special Portland Cements for Durability

Description

Special Portland cements are made for specific building needs, such as added durability, color, or lower cracking risk. One major example is Portland blast-furnace cement. It is made by blending Portland cement clinker with granulated blast-furnace slag, which makes up about 25 to 65 percent of the cement by weight.

Transcript

将波特兰水泥熟料与粒化高炉矿渣(炼铁过程的副产品)共同粉磨,可制得矿渣水泥。

可用于构建旨在抵抗氯离子和硫酸根离子侵蚀的大型结构。

白色水泥由白垩和高岭土制成,所含氧化铁和氧化锰较少,具有独特的白色,可用于建造外观美观的建筑立面。

将对混凝土无害的着色颜料加入白水泥中,可制得彩色水泥。

膨胀性水泥(如K型、M型和S型)是通过将波特兰水泥与膨胀剂及稳定剂混合制成的。这种水泥在硬化过程中通过早期形成钙矾石而产生受控膨胀,从而防止收缩开裂。

引气硅酸盐水泥使用较少的引气材料,在水泥基体中形成数以百万计的微小气泡。

这为水结冰时的膨胀提供了空间,从而防止因冻融循环导致的开裂。

防水波特兰水泥含有防...