Standards & compliance

In force

Published 2025-10-31 · In force 2026-08-01 · Fully replaces GB 8076-2008

Mandatory GB → recommended GB/T

• Adds two product families: waterproofing admixture (WrA-C) and anti-freeze admixture (AfA-C)
• Introduces a marking rule, e.g. L-HPWR-A GB/T 8076-2025 (state – code – standard number)
• Chloride ion limit changed to ≤0.10%, tested to GB/T 8077 with ion chromatography as the referee method
• Adds limits for released ammonia (≤0.10%) and residual formaldehyde (≤500 mg/kg) for indoor and underground use
• Air content of high-performance water reducers tightened from ≤6.0% to ≤4.5%
• Pumping aids: 1 h slump loss tightened from ≤80 mm to ≤60 mm, plus a new pressure bleeding ratio ≤90%
• Bleeding ratio requirement removed for high-range water reducers, early-strength, retarding and air-entraining admixtures
• “Relative durability (200 cycles)” renamed “freezing resistance index”; limit unchanged at ≥80%
• Factory acceptance test items increased from 8 to 15

Mandatory

Published 2025-08-01 · In force 2026-08-01 · New mandatory standard

Mandatory national standard

• First safety specification dedicated to concrete admixtures, in force the same day as GB/T 8076-2025
• Export and acceptance checks now need to cover both safety and performance limits

In force

Published 2017-12-29 · In force 2018-11-01 · Replaces JC 477-2005

Recommended national standard

• JC 477-2005 was withdrawn on 2024-08-09 — testing and acceptance should move to this standard
• Split by alkali content into alkali-free (liquid) and low-alkali (powder), then Type I (setting time) and Type II (strength)
• Adds stability, pH and dosage range requirements; 90 d strength retention ≥100% for alkali-free types