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Influence of cement mineral composition on cement testing instrument

Release time: July 11, 2019 popularity: seven

Influence of cement mineral composition on cement testing instrument

There are four main minerals in Portland cement, which are well known. Different hydration properties and different proportions of cement affect the overall properties of cement. Although C3a contributes greatly to the early strength, the hydration heat of C3A is several times higher than that of other minerals. Therefore, early strength cement with large content of C3A is easy to crack due to early temperature shrinkage, autogenous shrinkage and drying shrinkage. At present, water reducing agent and other admixtures are widely used in concrete, especially in concrete with medium or above strength grade. Because the hydration rate of C3A is the fastest. Firstly, a large amount of water reducing agent was adsorbed. Therefore, cement with high content of C3A generally has poor adaptability with admixtures.

Relationship between alkali content in cement and concrete cracking

Only when the three premises exist at the same time, because the alkali aggregate reaction must have enough alkali content, enough reactive aggregate and enough water supply in concrete. In dry weather, there is almost no alkali aggregate reaction, but alkali can promote the shrinkage and cracking of cement, resulting in the deterioration of concrete structures.

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