​ Hydroxypropyl Methyl Cellulose Ether HPMC in the Machine Sprayed Cement Mortar

 Hydroxypropyl Methyl Cellulose Ether HPMC in the Machine Sprayed Cement Mortar

(1) The water retention rate of mortar increases with the increase of HPMC content,

and the viscosity is The curves of 10W, 15W and 20W Pa.s cellulose ethers are basically the same.

When the content is 0.15%, the water retention rate is greater than 93%;

when the viscosity of the cellulose ether is 5W Pa.s, the water retention rate is greater than 0.15%. Lower than the other 3 kinds of viscosity HPMC.

(2) The density of the mortar gradually decreases with the increase of the HPMC content,

and the content is at The density decreases most obviously at 0.05%-0.20%, about 20% decrease;

when the content exceeds 0.20%, the density hardly changes; the air content of the mortar increases with the increase of the HPMC content.

(3) The increase of HPMC content will significantly reduce the mechanical properties of cement mortar,

but the corresponding compression ratio of the mortar will increase, and the flexibility of the mortar will become better.

(4) After HPMC is incorporated, the pore size of the mortar is significantly increased, and the proportion of harmful pores and harmful pores is significantly increased.

Compared with the blank sample, the sample with 0.1% HPMC content reduced harmless or less harmful pores by about 45%, and the harmful pores larger than 10um increased by about 9 times.

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