Cellulose for construction is an additive mainly used in construction production. Cellulose for construction is mainly used in dry powder mortar. The addition of cellulose ether is very low, but it can significantly improve the performance of wet mortar and affect the construction of mortar. Performance should be paid attention to in use. So what are the physical properties of cellulose for construction, and what is the construction process of cellulose for construction? If you don’t know much about the properties and construction process of cellulose for construction, let’s take a look together.
What are the physical properties of cellulose for construction:
1. Appearance: white or off-white powder.
2. Particle size; the pass rate of 100 mesh is greater than 98.5%; the pass rate of 80 mesh is greater than 100%.
3. Carbonization temperature: 280-300°C
4. Apparent density: 0.25-0.70/cm3 (usually around 0.5g/cm3), specific gravity 1.26-1.31.
5. Discoloration temperature: 190-200°C
6. Surface tension: 2% aqueous solution is 42-56dyn/cm.
7. Soluble in water and some solvents, such as proper proportion of ethanol/water, propanol/water, trichloroethane, etc. Aqueous solutions are surface active. High transparency, stable performance, different specifications of products have different gel temperatures, solubility changes with viscosity, the lower the viscosity, the greater the solubility, different specifications of HPMC have certain differences in performance, and the dissolution of HPMC in water is not affected by the pH value.
8. With the reduction of methoxyl content, the gel point increases, the water solubility of HPMC decreases, and the surface activity also decreases.
9. HPMC also has the characteristics of thickening ability, salt resistance, low ash powder, PH stability, water retention, dimensional stability, excellent film-forming property, and wide range of enzyme resistance, dispersibility and cohesiveness.
What is the construction process of cellulose for construction:
1. Base-level requirements: If the adhesion of the base-level wall cannot meet the requirements, the outer surface of the base-level wall should be thoroughly cleaned, and an interface agent should be applied to increase the water retention capacity of the wall and thus enhance the bonding strength between the wall and the polystyrene board.
2. Play control line: pop up the horizontal and vertical control lines of outer doors and windows, expansion joints, decorative joints, etc. on the wall.
3. Hang the reference line: Hang vertical reference steel wires at the large corners (external corners, inner corners) of the building’s exterior walls and other necessary places, and hang horizontal lines at appropriate positions on each floor to control the verticality and flatness of the polystyrene board.
4. Preparation of polymer adhesive mortar: This material is a prepared polymer adhesive mortar, which should be used according to the requirements of this product, without adding any other materials, such as cement, sand and other polymers.
5. Paste the overturned grid cloth: All exposed places on the side of the pasted polystyrene board (such as expansion joints, building settlement joints, temperature joints and other sutures on both sides, doors and windows) should be treated with grid cloth. .
6. Adhesive polystyrene board: Note that the cut is perpendicular to the board surface. The size deviation should meet the requirements of the regulations, and the joints of the polystyrene board should not be left at the four corners of the door and window.
7. Fixing of anchors: the number of anchors is more than 2 per square meter (increased to more than 4 for high-rise buildings).
8. Prepare plastering mortar: Prepare plastering mortar according to the ratio provided by the manufacturer, so as to achieve accurate measurement, mechanical secondary stirring, and even mixing.
Among the types of cellulose used in construction, the cellulose ether used by hydroxypropyl methylcellulose in dry powder mortar is mainly hydroxypropyl methylcellulose ether. Hydroxypropyl methylcellulose mainly plays the role of water retention, thickening and improving construction performance in dry powder mortar.
Post time: May-10-2023