ZS High-Alkali Cement Grinding Aid

ZS High-Alkali Cement Grinding Aid

1. Product Introduction

What is ZS High-Alkali Cement Grinding Aid?

ZS High-Alkali Cement Grinding Aid is designed for cement produced from high-alkali clinker and high-alkali limestone/clay raw material systems, while also being suitable for Ordinary Portland Cement and composite cement production lines. Its formulation utilizes an alkali-resistant anti-agglomeration system combined with highly compatible alkanolamines, effectively addressing common challenges associated with high-alkali materials—such as severe mill coating, difficulty in controlling fineness, excessively rapid early setting, poor compatibility with water reducers, and suboptimal strength development that may lead to concrete cracking.

How Does It Work?

1. Physical Alkali-Resistant Dispersion: Materials with high alkali content exhibit strong surface charge activity, making them highly prone to electrostatic agglomeration and the formation of material buildup on liners and grinding media. The product's specialized dispersing components stabilize and neutralize surface charges on high-alkali particles, eliminating in-mill adhesion. This optimizes the 3-32 μm particle size distribution, increases hourly grinding output, and reduces specific grinding energy consumption.

2. Hydration Regulation for Improved Compatibility: Formulated with a low-sodium, low-potassium alkanolamine system, the product does not increase the total alkali content of the cement. It complexes free potassium and sodium ions, mitigating issues such as flash set and significant slump loss often caused by high alkali levels. Additionally, it steadily activates the hydration of clinker and supplementary cementitious materials, providing balanced strength enhancement at both 3 and 28 days while stabilizing late-stage strength development in high-alkali cement.

Why Choose ZS High-Alkali Cement Grinding Aid from Shengchuan?

20 Years of Focused R&D: Built on Zhongsen Holding Group's deep expertise in challenging raw material systems.

43+ National Patents: Protected by extensive intellectual property in green cement additives.

Top University Partnerships: Ongoing industry-academia cooperation with Tsinghua University, University of Science and Technology Beijing, and University of Jinan.

National Standards Contributor: Participation in national key R&D projects and contribution to 6 national industry standards.

Proven in 20+ Markets: Validated in over 20 markets including China, Africa, Southeast Asia, Central Asia, and the Middle East.

2. Technical Indicators

Parameter	Specification	Remarks
Appearance	Tan and transparent	Uniform, free of precipitation
Density (20°C)	1.16 – 1.21 (g/cm³)	—
pH Value	7.8 – 10.2	—
Chloride Ion Content	≤ 0.1%	Safe for reinforced concrete
Alkali Content (Na₂Oeq)	≤ 1.0%	Low alkali risk
Recommended Dosage	150g – 300g/ton of cement	Optimized based on clinker type and mill conditions

3. Key Benefits

Performance Area	Expected Improvement
Mill Output Increase	10% – 20% (under equivalent fineness)
Energy Savings	8% – 15% reduction in specific power consumption
PCE Compatibility	Significant improvement in cement-polycarboxylate superplasticizer compatibility, reduced slump loss, no flash set
Strength Enhancement	3-day: +2.5-5 MPa; 28-day: +4-9 MPa
Crack Reduction	Reduces early hydration heat rate, mitigates concrete cracking risk

4. Case Study

Chongqing Cement Plant – P·O 42.5 Cement Trial

Parameter	Before	After	Improvement
SCM Total (%)	18	22	↑ 4
Clinker Usage (%)	82	78	↓ 4
3-Day Strength (MPa)	34	31.5	—
28-Day Strength (MPa)	48	52	↑ 4
Initial Mortar Spread (mm)	211	251	↑ 40
1h Mortar Spread (mm)	153	236	↑ 83
Slump Loss Rate (%)	27.5	5.9	↓ 21.6

Concrete Trial Results:

Parameter	Without Grinding Aid	With Grinding Aid	Improvement
Initial Slump (mm)	200	235	↑ 35
60min Slump (mm)	190	220	↑ 30
Initial Spread (mm)	410	580	↑ 170
60min Spread (mm)	300	550	↑ 250
Total Crack Area (mm²/m²)	587	253	↓ 56.9%

5. Frequently Asked Questions

Q: How is the optimal dosage determined?

A: The recommended range is 150g – 300g per ton of cement. Exact dosage depends on clinker alkali content, mill type, and target performance. Our technical team can assist with mill trials.

Q: Since the product is itself low-alkali, will it reduce the total alkali content of the cement?

A: The product does not introduce potassium or sodium alkali salts. It can indirectly lower the proportion of clinker per unit of cement by optimizing particle size distribution and increasing the dosage of SCMs, thereby achieving a slight reduction in the finished product's total alkali content. However, it cannot fundamentally alter the inherent alkali content of the clinker itself.

Q: High-alkali cement is prone to flash set; can this be improved by adding this product?

A: Yes. The components of the product chelate free alkali ions, mitigating the flash set caused by the rapid hydration of these ions and extending the workable time of the mortar or concrete.

Q: How does the product reduce concrete cracking area?

A: By significantly reducing the early-stage hydration rate of cement—especially the very early stage—the product lowers the heat of hydration, thereby reducing the risk of concrete cracking. It also weakens the adverse effects of alkali on C-S-H gel morphology, improving the late-stage strength of high-alkali cement and enhancing its continuous strength growth capability.

Q: How should the product be stored?

A: Store in a sealed plastic container at room temperature. Protect from freezing in winter. Do not store with high-salt or high-alkali admixtures. Shelf life: 6 months.

6. Application Scope

Application	Benefit
Ball Mill / Vertical Mill Grinding	Improved throughput, lower energy intensity
High-Alkali Clinker with Slag/Fly Ash Composite Cement	Resolve issues of insufficient strength and admixture incompatibility

7. Usage Guidelines

Calibration: Install a dedicated metering pump and calibrate to target dosage. Addition point: clinker feed belt or mill feed port.

Application Point: Apply evenly onto the clinker feed before entering the mill.

Monitoring: Track mill amperage, production rate (t/h), and cement quality (Blaine, residue).

Note: We provide methods for detecting and controlling the feed rate.

8. Related Products

ZS-High-Efficiency Enhanced Grinding Aid – For maximum clinker replacement.

ZS-Cement Strength Enhancer – For further strength improvement.

ZS-Hexavalent Chromium Reducer – For environmental compliance.

ZS-Vertical Mill Special Cement Grinding Aid – For vertical mill applications.

9. Call to Action

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