跳至主要内容

Interpretation of the New Cement Mortar Strength Testing Standard GB/T 17671-2021

 

1. Background

Cement strength is the core indicator of cement quality and a fundamental guarantee of structural safety in construction projects. The updated GB/T 17671-2021 “Method of Testing Cements – Determination of Strength (ISO Method)” officially came into effect on July 1, 2022, replacing the 1999 edition.

This revision systematically improves testing equipment requirements, operational procedures, and data processing methods, making China’s cement strength testing more scientific and closely aligned with ISO international standards.

2. Key Changes in the New Standard

1. Stricter Equipment Requirements

  • Higher precision requirements for mortar mixers, jolting apparatus, and compression testing machines

  • Enhanced requirements for structural rigidity and stability

  • Mandatory calibration and performance verification

2. More Standardized Procedures

  • Clear specifications for mixing water quality

  • Standardized cement mixing procedures

  • Detailed specimen molding and surface leveling requirements

  • Mandatory covering during curing to reduce moisture evaporation errors

3. More Scientific Data Processing

  • New provisions for handling abnormal flexural strength values

  • Optimized strength calculation methods

  • Reduced impact of random errors on final evaluation results

3. Impact on Laboratories and Technicians

1. Equipment Upgrading Becomes Essential

Laboratories must inspect and upgrade their equipment according to the new standard, especially ensuring that compression testing machines meet updated precision and rigidity requirements.

2. More Refined Operational Management

From sample preparation and water quality control to specimen molding and curing, every step directly affects strength results. Technicians must receive systematic training and strictly follow standard operating procedures.

3. More Accurate and Reliable Results

With standardized outlier handling and improved calculation methods, test results are more objective and better reflect actual engineering performance.

4. Conclusion

The revision of GB/T 17671-2021 marks an important step toward higher-quality and internationally aligned cement standards in China.

By raising equipment standards, refining procedures, and standardizing data management, the new regulation significantly improves the accuracy and repeatability of cement mortar strength testing, providing stronger technical support for construction quality and safety.

Laboratories and enterprises should complete the transition as soon as possible to ensure compliance and maintain competitiveness.

评论

发表评论

此博客中的热门博文

Innovating for the Future: High-Performance Building Additives by ARICH CELLULOSE®

Innovating for the Future: High-Performance Building Additives by ARICH CELLULOSE ® Driving Innovation in Construction Materials-ARICH CELLULOSE ® In today’s fast-evolving construction industry, efficiency, durability, and sustainability are key factors shaping the future. At ARICH CELLULOSE ® , we are at the forefront of innovation, providing high-performance powder additives that enhance construction materials' workability, strength, and longevity. As a global leader in the manufacturing and supply of Hydroxypropyl Methyl Cellulose (HPMC), Redispersible Polymer Powder (RDP), Polycarboxylate Superplasticizer (PCE Powder), Gypsum Retarder, and Powder Defoamer, we are committed to delivering cutting-edge solutions that meet the diverse needs of our clients worldwide. The Power of Advanced Formulation Our expertise lies in combining scientific research, state-of-the-art automation, and rigorous quality control to create additives that optimize the performance of cement-based and gyp...
发表评论
阅读全文

❌ Still Struggling with Tile Falling or Hollowing? This Complete Tile Adhesive Construction Guide Solves It Once and for All!

Tile installation seems simple, but it’s a craft where details make the difference . Most issues like tile falling, hollowing, or poor bonding are not caused by the adhesive itself — but by improper construction steps . For strong, level, and durable results, you must master these three essentials: 👉 Proper surface preparation, accurate mixing, and professional thin-bed application. 1. Surface Preparation — The Foundation of Success ✅ Materials and Tools Tile Adhesive Selection (Based on Beijing Standard DB11/T 344-2024): Application Area Recommended Type Interior Wall (Ceramic Tile)     C1 Type Vibration Areas (Elevator Shaft, etc.)     C2TS1 Type Underfloor Heating, Balcony, Outdoor     C2TES1 Type (Enhanced) Low-Absorption Tiles (<0.5%) like Porcelain or Sintered Slabs     C2 Enhanced Type                 Main Tools: Electric mixer, mixing bucket, notched trowel (8–10mm ...
发表评论
阅读全文

🔥Tiles Keep Debonding or Sound Hollow? 99% of Failures Come From These Details!

  1. Improper Application — The No.1 Cause of Tile Adhesive Failure (1) Wrong Mixing Method = Adhesive Performance Destroyed Common Symptoms: Dries too fast → thickens before application Dries too slow → stays soft for a whole day Poor bonding strength Causes: Insufficient mixing Wrong water ratio High temperature speeding up drying Low temperature/humidity slowing curing Correct Method: Add water first, then powder; mix twice with 3–5 min rest Follow exact water ratio Never add cement or sand (destroys formula → hollowing & debonding) (2) Wrong Tiling Technique — Dot-Mounting Is the Biggest Killer Symptoms: Hollow sound Edges lifting Whole tile falling off with backside clean Causes: Dot-mounting or thick-bed method → insufficient contact area Dust or release agent on tile backside Correct Method: Must use Thin-Bed Method + Double-Sided Buttering Coverage rate must be ≥90% Clean tile backs before installat...
发表评论
阅读全文