sodium and potassium concrete densifiers

Since World War 2, chemists have been treating concrete with mostly sodium and potassium concrete densifiers. These were great inventions causing the life of the concrete to be greatly extended. What the chemists did was to bond a sodium(in this example) molecule to a silicon molecule. The silicon molecule is the thing that actually causes the concrete to be more dense. The sodium molecule is the thing that is the transport for the silicon molecule. After the concrete is layed, the sodium silicate solution is scrubbed into the concrete. The sodium carrys the silcon molecule into the concrete allowing the silicon molecule to find pores and to fill them. Without these densifiers, those pores would remain and water would penetrate them. When water penetrates, it often freezed and then expands causing the concrete to crack very early in its life. These densifiers are necessary for the extension of the concretes life.