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The relationship between hydroxypropyl methylcellulose and cement and mortar

January 12, 2022by admin0

You may be unfamiliar when it comes to hydroxypropyl methyl cellulose, but when it comes to cement, mortar, and concrete, everyone is familiar with it. Hydroxypropyl methyl cellulose is an important additive in cement, mortar, and concrete. Let’s take a look at hydroxypropyl. What are the effects of methyl cellulose on the properties of cement, mortar and concrete.

The effect of hydroxypropyl methylcellulose on cement mortar:

1. The addition of hydroxypropyl methyl cellulose has an obvious retarding effect on the mortar mixture. As the content of hydroxypropyl methyl cellulose increases, the setting time of the mortar is successively extended. The same hydroxypropyl methyl fiber In the case of plain content, the setting time of mortar formed underwater is longer than that of formed in air. This feature is beneficial for underwater concrete pumping.

2. The freshly mixed cement mortar mixed with hydroxypropyl methylcellulose has good cohesive properties and almost no bleeding.

3. Incorporating hydroxypropyl methylcellulose underwater non-dispersible concrete admixture, and controlling the dosage is beneficial to the strength. The pilot project shows that the strength ratio of concrete formed in water to that in air is 84.8%, which is more effective.

4. The incorporation of water-reducing agent has improved the problem of increasing water demand of mortar, but its content must be controlled reasonably, otherwise the underwater anti-dispersion property of fresh cement mortar will sometimes be reduced.

The hydroxypropyl methyl cellulose (HPMC) used in cement mortar needs to have a higher viscosity, with a viscosity of 150,000 or more, and the resulting mortar has a better shape. The high-purity hydroxypropyl methyl cellulose produced by Obon Cellulose can Make cement mortar better.

The effect of hydroxypropyl methylcellulose on concrete:

In concrete, the addition amount of hydroxypropyl methyl cellulose will not be used too much, but it can significantly improve the performance of concrete. In particular, the selection of hydroxypropyl methyl cellulose with different degrees of viscosity will improve the performance of concrete. Play a positive influence. Hydroxypropyl methylcellulose has excellent thickening properties and can be used as concrete to resist dispersion and extrusion.

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