When we simulate the hydration process of Portland cement, it is of significant importance to know the hydration mechanisms. Basically, there are two mechanisms for the hydration of Portland cement, viz. Topochemical and Through-Solution Reaction.
1 Topochemical Reaction Concept
How is GGBS used?
GGBS (Ground Granulated Blastfurnace Slag) is used all over the world as a direct replacement for Portland cement. It is added to the concrete mixer along with ordinary cement, aggregates and water.
Several days ago, I posted that the global cement output is decreasing in the first half of 2012. So how about the price trend of cement worldwide? Is it increasing or not?
Information from different sources shows the prices of cement varies worldwide. For instance, prices of cement in South Africa had been retailing at US $186-230/ton in March of 2012. Due to an acute shortage of cement in Ghana, cement price has rapidly risen over the latest 12 months by 25% in the capital Accra and by up to 35% in rural areas.
Cement, the gray and fine powder, is the most used construction material on the world. However, how many people do they know what cement is? the answer for this question from Wikipedia is as follows,
Many XRD analysis results have shown the main hydration products of slag blended cement are essentially similar with that of pure Portland cement, except the amounts of CH found by this method or other are in varying degrees and less than those that should be given by the pure Portland cement constituent if the slag part did not participate the reaction.