Hydroxy Propyl Methyl Cellulose (HPMC) helps to significantly improve the water-holding capacity of mortar. Just a low level of hydroxypropyl methyl cellulose addition can lead to a significant improvement in the water retention rate of the mortar.
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When the addition level is 0.002%, the water retention rate increases from 83% to 88%; while the former is 0.02%, the latter can reach 97%. Meanwhile, low level of hydroxypropyl methyl cellulose addition can also significantly reduce the layering degree and bleeding rate of the mortar. This shows that hydroxypropyl methyl cellulose can not only enhance the water-holding capacity of the mortar but also significantly improve the cohesiveness of the mortar, which is very advantageous to the uniformity of mortar construction quality.
This is one of the most important Hydroxypropyl Methyl Cellulose effects. The building special hydroxypropyl methylcellulose can prevent water from penetrating the wall. An appropriate amount of water staying in the mortar helps to make the cement have a longer time for hydration. The water-holding capacity is proportional to the viscosity of the cellulose ether solution in the mortar, so the higher the viscosity is, the better the water-holding capacity will be; once the water molecules increase, the water-holding capacity will decrease. This is because for the same amount of the building special hydroxypropyl methyl cellulose solution, the increase of water means the decrease in viscosity. The increase of water-holding capacity will lead to extending the curing time of the mortar in the construction.
HPMC for mortarThe application of hydroxypropyl methyl cellulose can improve the workability of mortar.
All air-entraining agents have the function of wetting agents, because they can reduce the surface tension and then help the fine powder in the mortar to disperse when mixing with water.
Another of the hydroxypropyl methyl cellulose effects. Good anti-sagging mortar means no sagging or downward flow hazards during thick-layer construction. The sag resistance can be improved by building special hydroxypropyl methyl cellulose, especially the newly developed building special hydroxypropyl methyl cellulose, which can provide the mortar with better sag resistance.
High bubble content can lead to better yield and workability of the mortar, and reduce the formation of cracks. Meanwhile, it also reduces the strength value, and the &#;liquefaction&#; phenomenon occurs. The bubble content usually depends on the stirring time. hydroxypropyl methyl cellulose products are widely used to improve the performance of hydraulic building materials, such as cement and plaster. In the cement-based mortar, it can improve the water-holding capacity, extend the correction time and opening hours, and reduce sagging phenomena.
Improvement Effects of Hydroxypropyl Methylcellulose on Cement-Based Materials
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Hydroxypropyl methyl cellulose ( HPMC for short) has excellent thickening property and can be used as a good dispersion resistance agent for concrete. In recent years, with the development of exterior insulation technology, the improvement of cellulose production technology, and its own excellent properties, hydroxypropyl methyl cellulose has been widely used in the construction industry.
Dispersion resistance is an important technical indicator to measure the quality of dispersion-resistant agents. As a water-soluble polymer compound, also known as water-soluble resin or water-soluble polymer, hydroxypropyl methyl cellulose is s a hydrophilic polymer material by increasing the viscosity of mixing water to increase the consistency of its mixture, and can be dissolved in water to form a solution or dispersion. With the increase of hydroxypropyl methyl cellulose dosage, the dispersion resistance of freshly mixed cement mortar will get better and better.
Characteristics of Concrete Strength
(1). The addition of hydroxypropyl methyl cellulose has an obvious retarding effect on the mortar mixture. With the increase of hydroxypropyl methyl cellulose dosage, the setting time of mortar will be successively extended. Under the condition of the same hydroxypropyl methyl cellulose dosage, the setting time of mortar molded under water is longer than that molded in the air. This characteristic is beneficial for underwater concrete pumping.
(2). The freshly mixed concrete mortar with the addition of hydroxypropyl methyl cellulose has very good cohesive properties and almost no bleeding phenomenon.
(3). The dosage of hydroxypropyl methyl cellulose and the water demand of mortar show a decrease at the beginning and then a significant increase.
(4). The addition of water reducing agents helps to improve the problem of increasing water demand for mortar, but remember to have a reasonable control of its addition amount; otherwise it may sometimes make the dispersion resistance under water of freshly mixed cement mortar decrease.
(5). The cement mortar test pieces with the addition of hydroxypropyl methyl cellulose and the blank test pieces have little difference in the structure; moreover, the cement mortar test pieces pouring in the water and in the air have little difference in the structure and density. The main reason is although the addition of hydroxypropyl methyl cellulose greatly reduces the loss and the degree of dispersion of cement pouring in the water, it also makes the density of the cement decrease at the same time. In the construction, under the condition of ensuring non-dispersible effects under water, the dosage of hydroxypropyl methyl cellulose should be minimized as possible.
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