Application of Cellulose Ether in Mechanized Plastering Mortar Construction

With the continuous advancement of construction industrialization and the growing demand for higher construction efficiency, mechanized plastering mortar 

application is gradually replacing traditional manual plastering methods. In this technological transition, cellulose ether additives play a critical role. Among them, 

Hydroxypropyl Methylcellulose (HPMC) and Methyl Hydroxyethyl Cellulose (MHEC) are the most commonly used functional admixtures, significantly improving 

workability, stability, and spray performance of plastering mortars.

1.Higher Performance Requirements for Mechanized Construction

Mechanized plastering typically relies on continuous mortar pumps and spraying equipment. Pre-mixed dry mortar is conveyed through a screw pump and delivered 

to a spray gun, where compressed air assists in projecting the mortar onto the substrate surface. Compared with traditional manual application, this method imposes 

stricter requirements on mortar rheology, water retention, and resistance to segregation.

If the mortar system lacks proper rheological control, problems such as bleeding, segregation, and pipeline blockage may occur during pumping and spraying, reducing 

construction efficiency. Therefore, the incorporation of cellulose ethers has become a key technical solution to ensure the stability of mechanized plastering operations.

2.Rheological Control Provided by Cellulose Ether

In cement-based plastering mortar systems, cellulose ether dissolves and swells in water to form a polymer network structure, significantly increasing system viscosity and 

improving thixotropic behavior. This characteristic allows the mortar to maintain good flowability during pumping while quickly rebuilding structural strength after spraying 

onto the wall, thereby reducing sagging.

Specifically, cellulose ether provides several functional benefits:

Thickening effect: increases plastic viscosity and enhances material stability.

Thixotropic regulation: allows mortar to flow easily under shear stress but rapidly rebuild structure at rest.

Anti-segregation performance: ensures uniform distribution of aggregates and cementitious materials.

Through these mechanisms, cellulose ether greatly improves the continuity and uniformity of mechanized plastering operations.

3.Improved Water Retention and Bond Strength

In plastering construction, the substrate often has high water absorption capacity. If water is lost too quickly from the mortar, cement hydration may be incomplete, negatively 

affecting early strength development and bonding performance.

Cellulose ether exhibits excellent water retention properties by forming a micro-colloidal structure that slows water migration and maintains a high water retention rate—often 

exceeding 90%. This contributes to:

Extended open time

Improved adhesion strength at the interface

Reduced risks of hollowing and cracking

For mechanized spraying systems, high water retention also ensures consistent mortar performance during pumping and spraying, which helps maintain stable application quality.

4.Formulation Optimization for Different Spraying Equipment

Different types of spraying equipment—such as screw pump machines and piston pump systems—require varying mortar viscosity and particle grading characteristics. 

As a result, the viscosity grade and dosage of cellulose ether must be optimized according to equipment specifications during formulation design.

Typical formulation parameters include:

Cellulose ether dosage of approximately 0.2%–0.4% in mechanized plastering mortar

Viscosity grades commonly ranging from 40,000 to 100,000 mPa·s

Synergistic use with additives such as starch ether to further enhance anti-sagging performance

Proper formulation design not only improves pumping efficiency but also reduces equipment wear and the risk of pipeline blockage.

5.Driving Efficiency in Modern Construction

With the rapid development of the dry-mix mortar industry and the increasing adoption of mechanized spraying equipment, the application of cellulose ether in plastering mortar 

continues to expand. Its advantages in improving workability, increasing construction efficiency, and reducing labor costs are becoming increasingly evident.

Name: Cecilia.Wang

E-Mail:cecilia.wang@jtdf-rdp.com

Mobile:+86 190 3451 3486（Whatsapp）