The production of gypsum-based self-leveling mortars requires the use of a variety of raw materials, each of which affects specific properties of the final product. An important component of self-leveling mortar is cellulose ether, which is an important additive.
Gypsum-based self-leveling mortars: an overview
Self-leveling mortar is a specialty building material designed for flooring applications that require a smooth, level surface. These mortars typically consist of binders, aggregates and various additives to achieve specific performance characteristics. Gypsum is a natural mineral commonly used as the primary binder in self-leveling mortars due to its unique properties, including rapid setting and excellent workability.
Raw materials for gypsum-based self-leveling mortar:
1. Gypsum:
Source: Gypsum is a mineral that can be mined from natural deposits.
Function: Gypsum acts as the main binder for self-leveling mortar. It aids in rapid solidification and strength development.
2. Aggregation:
Source: Aggregate is derived from natural sediments or crushed stone.
Role: Aggregates, such as sand or fine gravel, provide bulk to the mortar and influence its mechanical properties, including strength and durability.
3. Cellulose ether:
Source: Cellulose ethers are derived from natural cellulose sources such as wood pulp or cotton.
Function: Cellulose ether acts as a rheology modifier and water-retaining agent to improve the workability, adhesion and overall performance of self-leveling mortar.
4. High-efficiency water reducing agent:
Source: Superplasticizers are synthetic polymers.
Function: High-efficiency water reducing agent improves the fluidity and workability of mortar by reducing the water content, making it easier to place and level.
5. Retarder:
Source: Retarders are usually based on organic compounds.
Function: Retarder can slow down the setting time of mortar, extend the working time and promote the leveling process.
6. Filling:
Source: Fillers can be natural (such as limestone) or synthetic.
Function: Fillers contribute to the volume of the mortar, enhancing its volume and affecting properties such as density and thermal conductivity.
7. Fiber:
Source: Fibers can be natural (e.g. cellulose fibers) or synthetic (e.g. polypropylene fibers).
Function: The fibers increase the tensile and flexural strength of the mortar and reduce the risk of cracking.
8. Water:
Source: Water should be clean and suitable for drinking.
Function: Water is essential for the hydration process of plaster and other ingredients, contributing to the development of mortar strength.
Production Process:
Raw material preparation:
Gypsum is mined and processed to obtain a fine powder.
The aggregate is collected and crushed to the required size.
Cellulose ethers are produced from cellulose sources through chemical processing.
mix:
Gypsum, aggregate, cellulose ethers, superplasticizer, retarder, fillers, fibers and water are precisely measured and mixed to achieve a homogeneous mixture.
QC:
The blend undergoes rigorous quality control testing to ensure it meets specified consistency, strength and other performance standards.
Package:
The final product is packaged into bags or other containers for distribution and use at construction sites.
in conclusion:
The production of gypsum-based self-leveling mortars requires careful selection and combination of raw materials to achieve the required properties. Cellulose ethers play a key role as additives that improve the workability, adhesion and overall performance of the mortar. As the construction industry continues to evolve, research and development in materials science may lead to further improvements in self-leveling mortars, including the use of innovative additives and sustainable raw materials.
Post time: Dec-11-2023