Solution : Process of setting of cement under water is essentially an hydration process.
Contents
What is the setting process of cement?
The setting process of cement starts as it is mixed with water. The chemical phenomenon that takes place are divided into 3 stages, 1. Hydrolysis and Hydration Stage The process of setting starts after the addition of water. In this process the four compounds of cement (C 3 S, C 2 S, 3CA1, 4CAFe) get hydrated.
What happens when water is added to the cement?
When the water is added to the cement, it will starts setting and if setting time is not longer, the place where masons are casting concrete, the concrete will immediately set at that place only so to prevent the setting at the place of casting, setting time is required.
What is the chemical phenomenon that takes place in cement?
1. Hydrolysis and Hydration Stage – The process of setting starts after the addition of water. In this process the four compounds of cement (C 3 S, C 2 S, 3CA1, 4CAFe) get hydrated. C 3 S compound of cement gets hydrated and form a complex hydro silicates.
What is the process of hydration of cement?
We can divide the process of hydration of cement into 5 phases, 1. Initial Mixing Reaction Initially, after mixing the water and cement, there will be a temperature peak. Aluminate (C3A) reacts with water (H2O) to make aluminate hydrate. The energy which is released in these reactions can be the cause of the initial peak.2. Dormancy
What is the chemical phenomenon that takes place in cement?
1. Hydrolysis and Hydration Stage – The process of setting starts after the addition of water. In this process the four compounds of cement (C 3 S, C 2 S, 3CA1, 4CAFe) get hydrated. C 3 S compound of cement gets hydrated and form a complex hydro silicates.
What are the different stages of setting of cement?
2. Colloidisation Stage – The products formed from the above stage seperates out in the form of a gel which gets gradually thickened and acts as glue around aggregates. Thereby initiating the setting of the cement. During this stage, the mortar (cement-water-sand paste) becomes fully saturated and can take no more water.
What happens when cement is mixed with water?
Stages of Cement Hydration Process – With the mixing of water, hydraulic cement compounds react with each other and make hydrated compounds with very low solubility. The cement hydration process is not instantaneous. The reaction is faster in the early stages and continues indefinitely at a reduced rate.
initial mixing reaction Dormancy Strength acceleration Speed Reduction Steady development
What is the process of hydration of cement?
We can divide the process of hydration of cement into 5 phases, 1. Initial Mixing Reaction Initially, after mixing the water and cement, there will be a temperature peak. Aluminate (C3A) reacts with water (H2O) to make aluminate hydrate. The energy which is released in these reactions can be the cause of the initial peak.2. Dormancy
