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Viscosity Modifying Agent

Viscosity Modifying Agent M-45 is a kind of polymer that extremely soluble in water , compounded with high-performance water retention ingredients. As a integral finishing aid, it can effectively reduce bleeding and segregation of mortars and aggregates in concrete. Contains no added chlorides or chemicals known to promote corrosion of steel. Excellent compatibility with most other admixtures commonly used in concrete, including air-entraining agents, polycarboxylate superplasticizer and cement retarders.


  • Type: Viscosity Modifying Agent

  • HS Code: 3824409000

  • Model No.: M-45


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Viscosity Modifying Agent
Viscosity Modifying Agent
Viscosity Modifying Agent
Viscosity Modifying Agent
Viscosity Modifying Agent
Viscosity Modifying Agent
Viscosity Modifying Agent
Viscosity Modifying Agent
FAQs

Viscosity Modifying Agent Functions

Improves finishability

Reduces bleeding

Provides thixotropic properties

Reduces segregation during pumping

Excellent compatibility with admixtures

No effect on strength and durability

Specifications

AppearanceYellowish liquid
Solid content%40
Viscosity (mPa.s, 25°C)2200
Bulk density/(g/mL, 25℃)1.07
Ph value(1% water dispersion, 25°C) 6
Dosage In
(50% solid content of Concrete admixture)  		 0.2-1.0 %


Viscosity Modifying Agent Construction

Construction in high evaporation rate conditions
Concrete designs using gap-graded aggregates
Concrete with reduced compatibility
Long distance pumping of concrete
Lightweight and heavyweight aggregates
Self-Consolidating Concrete
Construction in high evaporation rate conditions
Construction in high evaporation rate conditions

Stabilizes low water-cement ratio systems, preventing segregation while maintaining high flowability and structural integrity.

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Concrete designs using gap-graded aggregates
Concrete designs using gap-graded aggregates

Improves cohesion and stability of the mix, preventing segregation caused by uneven particle size distribution.

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Concrete with reduced compatibility
Concrete with reduced compatibility

Enhances tolerance to variations in cement and admixtures, ensuring consistent performance and reducing mix sensitivity.

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Long distance pumping of concrete
Long distance pumping of concrete

Stabilizes the concrete during transport, reducing segregation and bleeding while improving continuous pumpability.

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Lightweight and heavyweight aggregates
Lightweight and heavyweight aggregates

Prevents floating or settling of aggregates by increasing viscosity, ensuring uniform distribution throughout the mix.

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Self-Consolidating Concrete
Self-Consolidating Concrete

Provides excellent stability at high flow, preventing segregation and ensuring smooth, self-leveling performance

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FAQ-Viscosity Modifying Agent (VMA)

What is a Viscosity Modifying Agent (VMA) and how does it work?

A Viscosity Modifying Agent (VMA) is a high-performance chemical additive designed to modify the rheological properties and stability of fresh concrete and mortar.

  • Mechanism: Long-chain polymer molecules in the VMA bind water and form a three-dimensional network structure within the cement paste. This increases the yield stress and plastic viscosity of the mix, keeping aggregates and cement particles homogeneously suspended without reducing fluid flow.


What are the main benefits of using a VMA in concrete and dry-mix formulations?

Adding a VMA provides essential physical stability during mixing, pumping, and placing:

  • Prevents Segregation & Bleeding: Keeps coarse aggregates suspended and prevents water from separating to the top surface.

  • Enhances Pumping Efficiency: Reduces friction in pipes, prevents blockage in high-rise or long-distance pumping, and lowers pump pressure requirements.

  • Improves Washout Resistance: Crucial for underwater concrete placement to prevent cement paste from washing away.

  • Enhances Surface Finish: Eliminates bug-holes, sand streaks, and honeycomb defects on molded surface finishes.


What are the key application areas for VMA?

Viscosity Modifying Agents are widely specified across specialized, high-performance concrete and dry-mix applications:

  • Self-Compacting Concrete (SCC): Maintains high slump flow while preventing aggregate settlement.

  • Underwater & Anti-Washout Concrete: For bridge piers, harbor foundations, and marine structures.

  • Pumped & High-Strength Concrete: For skyscrapers and complex structural castings.

  • Dry-Mix Mortars & Self-Leveling Compounds: Stabilizes self-leveling underlayments and prevents bleeding in flowable grouts.


How does VMA interact with Polycarboxylate Superplasticizers (PCE)?

VMA and PCE work in perfect synergy.

  • PCE provides high fluidity and water reduction by dispersing cement particles.

  • VMA controls the internal stability, preventing the segregation that often occurs when concrete is made extremely fluid by PCE.

  • Result: Combining PCE and VMA creates a highly flowable yet robust concrete mixture with exceptional stability and placeability.


What is the standard recommended dosage rate?

  • For Concrete Formulations: Typically 0.02% to 0.2% by weight of total cementitious materials (depending on whether it is liquid or powder VMA, and the degree of fluidity required).

  • For Dry-Mix Mortars & Grouts: Typically 0.05% to 0.3% of the total dry formulation.

  • Note: VMA is highly sensitive. Optimal dosage depends on water-cement ratio, aggregate grading, and target flowability. We recommend running laboratory trial mixes to establish precise dosage.


What types of VMA are available (Powder vs. Liquid)?

  • Powder VMA: Ideal for dry-mix mortar plants (e.g., self-leveling compounds, non-shrink grouts) where direct dry-blending is required.

  • Liquid VMA: Ideal for ready-mix concrete batching plants and precast facilities using automated liquid dosing equipment.


Does VMA affect the hydration rate or compressive strength of cured concrete?

No, not when used at recommended dosages. High-quality VMAs are engineered to alter only the physical matrix viscosity of unhardened concrete. They do not retard cement hydration or reduce ultimate 28-day compressive strength. In fact, by eliminating internal micro-bleeding and honeycomb voids, VMAs often improve finished compressive strength and durability.


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Celix Cellulose Co., Ltd, is an integrated chemical cellulose manufacturer with in-house R&D, factories, and global sales sites.


Our products include HPMC, HEC, MHEC, VAE RDP, PCE, PVA, Defoamers, PP fibers, HPS, SHP and Gypsum Retarder.

Celix Cellulose Co., Ltd, is an integrated chemical cellulose manufacturer with in-house R&D, factories, and global sales sites.


Our products include HPMC, HEC, MHEC, VAE RDP, PCE, PVA, Defoamers, PP fibers, HPS, SHP and Gypsum Retarder.

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  • info@celixcellulose.com
  • Factory Address: XiuCun West, Jinzhou Economic Development Zone, Shijiazhuang City, Hebei Province, China.
  • HQ Office Address: 1806, Zhongheng Building, Chang'an district, Shijiazhuang, Hebei Province, China.
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