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HPMC The Water Reduction Rate Is Gradually Increased
Aug 03, 2017

HPMC The water reduction rate is gradually increased

Chemical experiments show that in the case of gray sand than with certain circumstances, with the increase of hydroxypropyl methyl cellulose content, the water reduction rate is gradually increased, that is in the scope of this test (cellulose ether content Ying. 2%) of cellulose ether has a certain water reduction, the main reason is due to the incorporation of polymer into the bubble caused by the bearing effect. At the same time, it can be found that the increase degree of water reduction is the largest when mixed with M1, and the increase rate of water reduction is the smallest when mixed with M3, which indicates that the viscosity of cellulose ether is more obvious. In the case of the same viscosity of the hydroxypropylmethylcellulose, the smaller the ashing ratio, the weaker the effect of water reduction, but not significant.

3.2 Water retention

The results show that the water retention rate of the mortar decreases significantly with the decrease of the sand ratio when the hydroxypropylmethylcellulose is not added. After the incorporation of cellulose ether, mortar water retention rate changes have two characteristics, one with the fiber yarn content increased and increased, and the greater the viscosity, the higher the water retention rate. Second, the increase increases with the decrease of the sand ratio. To mix M1 as an example, the ratio of lime sand l: 3, without adding cellulose ether retention rate of 82.3%, and mixed / x. O 2% cellulose ether, the water retention rate of 1J98.9%, an increase of about 16%: lime sand ratio of l: 4. Not holding cellulose ether water retention rate of 78.1%, mixed with A. 0.2% cellulose ether after the water retention rate of 98, an increase of about 20%; and gray sand ratio of 1: 5, the water retention rate from 72.3% of cellulose ether added to 0.2% 98.3% of the ether, an increase of about 25%.

3.3 Bulk density

The results show that the bulk density of the new mortar decreases with the decrease of the sand ratio when the hydroxypropylmethylcellulose is not added. Obviously, this is related to the density of cement paste in the fresh cement mortar, the sand bulk density and its dosage. When the ash sand ratio decreases, the water-cement ratio rises, and the density of the corresponding cement paste decreases, and the sand bulk density is close to the density of the cement paste at the lime ratio of l: 5, so the bulk density of the new mortar With the reduction of shade ratio. The incorporation of cellulose ether, the volume density of mortar with the increase in the amount of cellulose ether significantly reduced, and the greater the viscosity, the more obvious effect. This is because the cellulose ether has a certain air-entraining effect, and the greater the viscosity of the more air, gas and the role of more and more obvious, so that its density decreased. Compared with the different sand and sand ratio, it was found that with the same viscosity of cellulose ether, the decrease of bulk density decreased with the decrease of sand ratio.

3.4 Condensation time

The results show that the coagulation time of the mortar is prolonged obviously with the decrease of the sand ratio. After the incorporation of cellulose ether, the change of mortar coagulation time has two characteristics: one is extended with the increase of cellulose ether content, and the cellulose ether viscosity is smaller, the longer the suspicion: the second is its increase With the decrease of the sand ratio.