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The influence of HPMC in cement-based materials mortar
time:2014/5/14 14:31:31 source: The author: Click on the:1214
Building special hydroxypropyl methyl cellulose products are widely used to improve the performance of the hydraulic construction materials such as cement, gypsum and so on.In the cement mortar, it can improve the water retention, extend the correct time and open time, and can reduce the flow phenomenon.
1, water retention,Avoid building dedicated hydroxypropyl methyl cellulose water seeping into the wall.Stay just the right amount of moisture in the mortar, cement has a longer time for the hydration, water retention is proportional to the cellulose ether in the mortar solution viscosity, the higher the viscosity, water retention, the better.Once the water molecules increase, water retention.Because for the same amount of building special hydroxypropyl methyl cellulose solution, more flow means that the viscosity decrease.Can lead to increased water retention was the extension of construction mortar cure time.
2, the improvement of constructionThe application of hydroxypropyl methylcellulose HPMC could improve mortar construction.
3, lubrication ability
All the air-entraining agent has the effect of wetting agent because of its lower surface tension and help in the mortar powder scattered when mixed with water.
4, sag resistance
Good resistance to flow hanging mortar means with thick layer construction when there is no risk of sagging or downward flow.Flow resistance hang sex but by building dedicated hydroxypropyl methyl cellulose to improve.Especially the new development of building special hydroxypropyl methyl cellulose can provide the mortar better resistance to flow.
5, bubble content
High bubble content result in better productivity and dry-mixed mortar, reduce crack formation.It also reduces strength value, appear the phenomenon of liquefaction.Bubble content usually depends on the mixing time.