混凝土是建筑领域必用的产品，在二氧化碳、水、氯离子、硫酸盐等的介质的侵蚀作用下会加速破坏，为延长使用寿命，会在其中加入氢氧化钾。那么这是为什么呢？下面小编来解答下：
Concrete is a necessary product in the construction field. It will accelerate the damage under the erosion of carbon dioxide, water, chloride ion, sulfate and other media. In order to prolong the service life, potassium hydroxide will be added into the concrete. So why is that? Here's the answer:
1、混凝土的干缩性能。掺有本品的混凝土，在室温下养护时，前二个月的收缩要略大些，三个月以后则掺剂混凝土的收缩要比未加的小些。
1. Dry shrinkage of concrete. When the concrete mixed with this product is cured at room temperature, the shrinkage of the first two months is slightly larger, and the shrinkage of the concrete mixed with agent after three months is smaller than that of the concrete not added.
2、抗冻融性。掺有氢氧化钾的混凝土，其容重比未加时要大，说明其密实性好，因而抗冻融性能要好。
2. Freeze thaw resistance. The volume weight of concrete mixed with potassium hydroxide is larger than that when it is not added, which indicates that it has good compactness and therefore has better freeze-thaw resistance.
3、抗掺性能。有该产品的混凝土，它的抗渗标号比未加剂混凝上的抗渗标号要高。
3、 Anti Doping performance. For concrete with this product, its impermeability grade is higher than that of concrete without admixture.
4、混凝土的徐变。掺加产品的混凝土的徐变度，比不加剂混凝土的要小，徐变系数也小，故用于预应力混战土时，仍可保留必要的性能。
4. Creep of concrete. The creep degree of the concrete mixed with the product is smaller than that of the concrete without the agent, and the creep coefficient is also smaller. Therefore, when it is used in the prestressed mixed soil, the necessary properties can still be retained.

5、其它性能，对加入氢氧化钾的混凝土的碳化及锈蚀等方面均有过试验报导。一般，在正常使用下，均未发现有不良的影响。
5. Other properties, such as carbonation and corrosion of concrete added with potassium hydroxide, have been reported. Generally, under normal use, no adverse effects were found.
以上就是氢氧化钾对于混凝土物理性能的几大影响，混凝土中加入氢氧化钾增强了使用强度，以达到经济适用的目的。那么，在这里小编也要提醒大家在添加时要适量，不可过多或过少。
The above is the impact of potassium hydroxide on the physical properties of concrete. The addition of potassium hydroxide in concrete enhances the service strength, so as to achieve the purpose of economic applicability. In this case, the editor should also remind you to add the right amount, not too much or too little.