Following the addition of hydroxypropyl methylcellulose to 0.5% in foamed concrete, the slump decreased slightly. The data clarified that when the content of hydroxypropyl methyl cellulose does not exceed 0.05%, the participation of hydroxypropyl methyl cellulose can significantly improve the fluidity and viscosity of the foam concrete slurry. After the hydroxypropyl methyl cellulose is dissolved, a moist and flexible film is formed between the solid particles and the gas bubbles, which has an excellent smooth effect during the mixing process. It also makes the bubbles change without being easily disillusioned. The free and uniform "balls" in the slurry effectively improve the fluidity of the fresh slurry: But if the amount of hydroxypropyl methylcellulose exceeds 0.5%, the slurry will become too viscous and the fluidity will be greatly reduced. Therefore, 0.05% hydroxypropyl methylcellulose not only ensures the slump, but also stabilizes the bubbles, which is ideal for mixing.
The height of the test block lowered in the mold after forming characterizes the effect of hydroxypropyl methylcellulose on the volume stability of the foam concrete. It can be seen that the dosage of 0.05% of hydroxypropyl methyl cellulose is the ideal dosage, and when the amount of hydroxypropyl methyl cellulose is 0.05%, the height increase is reduced. The analysis believes that when the hydroxypropyl methyl cellulose is appropriate, it can also reduce the volume of the hardened body while improving the fluidity of the slurry.
The slurry is constantly losing water during the hardening process. The internal foam is constantly disillusioned, and the hardening body shortens inevitably. This causes the volume of the hardening body to be unstable, and the addition of hydroxypropyl methylcellulose provides both for the hardening body It has excellent water retention effect, and can stabilize the internal foam of the hardened body through the characteristics of slurry hardening and hydroxypropyl methylcellulose film hardening, and then has an outstanding foam stabilizing effect, reducing the volume of the hardened body.