ZS-HPRA Slump-Retaining Water Reducer

ZS-HPRA Slump-Retaining Water Reducer

1. Product Introduction

What is ZS-HPRA Slump-Retaining Water Reducer?

ZS-HPRA Slump-Retaining Water Reducer is a carboxylate graft copolymer concrete admixture developed by Shengchuan Company, featuring superior slump retention capabilities. The product is highly adaptable to various concrete mixes and requires low dosage. It is particularly suitable for concrete projects requiring long-term fluidity retention, high-temperature slump retention, medium-to-low slump retention, and precast pumped concrete.

How Does It Work?

The slump-retaining polycarboxylate molecules contain slowly hydrolyzable ester-based slow-release side chains:

Rapid Adsorption & Dispersion: Carboxyl groups rapidly adsorb onto cement particle surfaces, combining electrostatic repulsion and steric hindrance to disperse flocculated cementitious materials, achieving initial water reduction and flowability.

Sustained Release Mechanism: Under the alkaline conditions of concrete slurry, the ester groups in the side chains gradually hydrolyze, continuously releasing active carboxyl groups to replenish the effective components consumed by cement hydration.

Long-Lasting Slump Retention: This sustained release mechanism provides continuous dispersion capacity, effectively controlling slump loss over extended periods.

Why Choose ZS-HPRA Slump-Retaining Water Reducer from Shengchuan?

20 Years of Focused R&D: Built on Zhongsen Holding Group's deep expertise in energy-saving and environmental protection for the cement industry.

43+ National Patents: Protected by extensive intellectual property in green cement additives, composite cementitious materials, and waterproofing technologies.

Top University Partnerships: Ongoing industry-academia cooperation with Tsinghua University, University of Science and Technology Beijing, and University of Jinan, along with an academician workstation in Shandong Province.

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

Proven in 20+ Markets: Since 2006, validated in over 20 markets including China, Africa, Southeast Asia, Central Asia, and the Middle East.

2. Technical Indicators

Parameter	Specification	Remarks
Appearance	Colorless and transparent	Uniform, free of precipitation
Density (20°C)	1.08 ± 0.02 kg/m³	—
Solid Content	40 ± 1%	—
Water Reduction Rate	≥ 25%	Meets requirements for different concrete grades
Chloride Ion Content	0%	Safe for reinforced concrete
Alkali Content (Na₂Oeq)	≤ 1.0%	Low alkali risk
Recommended Dosage	2kg – 12kg per ton of cementitious material (0.2%–1.2%)	Fine-tuned based on sand and gravel mud content

3. Key Benefits

Performance Area	Expected Improvement
Compressive Strength Improvement	3-day: 25%–38% increase; 28-day: 22%–35% increase (at equal cementitious material and slump)
Durability Improvement	Impermeability: seepage height reduced by 30%–45%; Carbonation resistance: 28-day carbonation depth reduced by 25%–35%
Cementitious Material Reduction	8%–18% reduction at equal strength and water-cement ratio; saves 10%–20% cement
High Slump Retention	Slump and spread remain unaffected for 3-4 hours; setting time can be extended by 5-8 hours based on construction needs

4. Case Study

C30 Concrete Summer Trial – Commercial Batching Plant Comparison

Parameter	Conventional Product	Shengchuan ZS-HPRA	Improvement
Cement (kg/m³)	200	200	—
Slag (kg/m³)	100	100	—
Fly Ash (kg/m³)	80	80	—
Water (kg/m³)	165	165	—
Admixture Dosage (%)	2.2	2.2	—
Initial Slump/Spread (mm)	210/530	230/550	↑ 20/20
2-Hour Slump/Spread (mm)	150/350	220/530	↑ 70/180

Result: At equal dosage and solid content, ZS-HPRA maintained initial performance after 2 hours (220/530mm) while the conventional product dropped significantly to 150/350mm. Shengchuan product usage ratio was only 50% in the admixture blend.

5. Frequently Asked Questions

Q: How is the optimal dosage determined?

A: The recommended dosage is 2kg – 12kg per ton of cementitious material. The optimal dosage can be fine-tuned based on cement compatibility, temperature, and concrete slump requirements. Our technical team can assist with industrial trials to determine your optimal economic dosage.

Q: Is this product chloride-free? Will it corrode steel reinforcement?

A: Yes, it is chlorine-free and low in alkali. It complies with national standards, does not corrode steel reinforcement or concrete, and does not cause efflorescence.

Q: Can ZS-HPRA be used together with concrete synergist?

A: Yes, the two can be added separately. The water reducer reduces water and increases strength, while the synergist activates admixtures to further save cement. The combined cost reduction effect is optimal.

Q: How should ZS-HPRA be packaged and stored?

A: It can be transported by tanker truck or in 1000kg plastic drums. Custom packaging is available upon request. Shelf life is 1 year. If sedimentation occurs within the shelf life, stirring before use will not affect performance.

Q: Is there real case data proving the slump retention performance?

A: Yes. In a commercial batching plant summer trial, ZS-HPRA maintained slump/spread at 220/530mm after 2 hours with almost zero loss, while a conventional product dropped from 210/530mm to 150/350mm. At equal dosage, ZS-HPRA delivered significantly superior slump retention.

6. Application Scope

Application	Benefit
Commercial Batching Plants	Save cement, reduce raw material costs
Precast Component Factories	Early strength enhancement, improved impermeability and frost resistance
Specialized Infrastructure Projects	High admixture content, low heat of hydration, prevents through-cracks, enhances impermeability and erosion resistance

7. Usage Guidelines

Calibration: Install a dedicated metering pump. Add ZS-HPRA at 0.2%–1.2% of total cementitious material mass (2kg – 12kg per ton). Direct metering can be used when no lift is required; a two-stage pumping method is used when the feeding height needs to be increased.

Application Point: Add to the mixer simultaneously with mixing water. Do not mix directly with dry materials.

Note: We provide customers with methods for testing and controlling concrete compatibility.

8. Related Products

ZS-PCA High-Performance Water Reducer – For maximum water reduction needs.

ZS-HPSA Water-Reducing Polycarboxylate Superplasticizer – Standard water-reducing applications.

ZS-FPCA Anti-Freeze Water Reducer – For cold weather concreting.

ZS-Concrete Enhancer – Optimize concrete mix design and reduce cement usage.

9. Call to Action

Our engineering team is available for virtual or on-site concrete mix optimization. Contact us today for a free compatibility analysis tailored to your plant's specific materials and requirements.

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