Shrinkage-Reducing Additives · 🇳🇴 Norway
Newchem AS A29
Expansive additive with high early expansion and pronounced shrinkage compensation
Newchem AS A29 is a new development 2026: a powder-form expansive additive for cement-bound mortar and concrete systems. Through early ettringite formation, the product generates a high expansion level within the first 36 to 48 hours, counteracting later shrinkage and reducing crack formation. Production takes place in Europe; the raw material base is almost entirely European.
- Dosage
- 3–8 % by weight of cement (uniform reference for concrete and mortar). Worked example for dry mortars: 0.75–2.0 % of the dry mix at approx. 25 % cement content. Exact dosage to be determined by laboratory pre-trials; avoid overdosing.
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Benefits
- High expansion level within the first 36 to 48 hours (+100 µm vs. −30 µm OPC reference)
- Reduces shrinkage by around 21 % vs. OPC reference (330 vs. 420 µm, Schleibinger)
- Reduces crack formation, increases durability and service life
- Uniform dosage reference for concrete and mortar: 3–8 % by weight of cement
- Production in Europe and almost entirely European raw material base — short transport routes, lower CO₂ footprint
- Easy handling: readily dosable and conveyable powder
Applications
- Dry mortars
- Injection and grouting mortars
- Concrete precast elements
- Ready-mix concrete
Technical data
- Product category
- Expansive additive for cement-bound mortar and concrete systems
- Appearance
- Powder, beige to light brown
- Particle size D50
- approx. 10–15 µm (estimated)
- Particle size D90
- < 30 µm (estimated)
- Dosage (concrete and mortar)
- 3–8 % by weight of cement
- Worked example dry mortar
- 0.75–2.0 % of the dry mix (at ~25 % cement content)
- Early expansion 12–24 h
- AS A29: +100 µm/m · OPC reference: −30 µm/m (Schleibinger)
- Shrinkage behaviour 24 h – 28 d
- AS A29: approx. 330 µm/m · OPC reference: approx. 420 µm/m (approx. 21 % reduction)
- Shelf life
- 9 months under proper, dry and ventilated storage
- Packaging
- 25 kg bag · 1,000 kg Big Bag · silo on request
- Standards classification
- No conformity declaration under EN 934 and no CE marking; upper dosage range exceeds the 5 % limit of EN 934-2. Incorporation under NF EN 934-1 possible after prior testing.
- Origin
- Production in Europe, raw material base almost entirely European
- Quality assurance
- Newchem is ISO 9001:2015 certified
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