TruCast™ SiX Mix Designs
TruCast SiX is a multi-component powdered concrete admixture developed to simplify high-performance concrete production. It combines ultrafine reactive materials, plasticizing technology, shrinkage control, polymer modification, and air-management additives.
Use these starting formulations for GFRC, ECC-style, UHPC-style, and self-consolidating decorative concrete, including countertops, sinks, furniture, panels, cladding, tile, and architectural precast.
Start for Most Mixes
For GFRC, ECC-style, and general mixes. Use 20% for UHPC-style.
UHPC-Style Dose
Recommended for UHPC-style; an upper trial option for other mixes.
Reactive Contribution
Count half of the SiX weight in total cementitious weight.
Before Production
Confirm flow, finish, reinforcement, and performance.
Starting Formulations — Test with Your Materials
For GFRC, ECC-style, and general mixes, begin at 15% of Portland cement weight; trial up to 20% as needed. For UHPC-style concrete, use 20%. Cement chemistry, sand grading and moisture, fibers, pigments, temperature, and mixing equipment affect the result. These are mix-development starting points; verify the complete formulation before production.
Choose a TruCast SiX Mix Design
The GFRC, ECC-style, and UHPC-style recipes below are trial batches around 50 lb. Their final weights vary with the selected SiX dosage, water, and reinforcement. SiX quantities and cementitious calculations are displayed to 0.01 lb; calculations use unrounded amounts. Water is displayed to 0.1 lb.
The SiX percentage is an addition calculated from Portland cement alone, not from total batch weight or total binder weight. On phones, swipe the tables sideways to compare both dosage columns.
High-Performance GFRC Starting Mix
A starting formulation for countertops, sinks, furniture, architectural panels, cladding, and other GFRC applications.
| Ingredient | 15% — Recommended Start | 20% — Upper Trial Option |
|---|---|---|
| Portland cement | 19.5 lb | 19.5 lb |
| Sand | 19.5 lb | 19.5 lb |
| TruCast SiX | 2.93 lb | 3.90 lb |
| Starting water* | 6.1–6.5 lb | 6.2–6.6 lb |
| Reinforcement | AR glass: 1.0–1.5 lb; add last | AR glass: 1.0–1.5 lb; add last |
AR glass loading may vary for face coats, premix GFRC, backer mixes, and other castings. Select reinforcement for the application and confirm the complete mix through trial batches.
Cementitious Calculation
At 15%: 19.5 lb cement + 0 lb separately added pozzolan + (2.93 lb SiX × 50%) ≈ 20.96 lb total cementitious.
At 20%: 19.5 lb cement + 0 lb separately added pozzolan + (3.90 lb SiX × 50%) ≈ 21.45 lb total cementitious.
Approximate planning yield: about 0.4 cu. ft., or about 5 sq. ft. at 1 inch thick. Actual yield varies with the complete batch, air content, compaction, and materials; measure your trial batch yield before estimating production quantities.
ECC-Style / PVA-Reinforced Starting Mix
A starting formulation for thin-section, PVA-reinforced concrete where toughness, crack control, and workability are important. ECC-type ductility depends on the complete mix and testing.
| Ingredient | 15% — Recommended Start | 20% — Upper Trial Option |
|---|---|---|
| Portland cement | 19 lb | 19 lb |
| Silica fume | 1 lb | 1 lb |
| Sand | 20 lb | 20 lb |
| TruCast SiX | 2.85 lb | 3.80 lb |
| Starting water* | 6.2–6.6 lb | 6.4–6.8 lb |
| Reinforcement | PVA 100s: 0.5–1.0% of total batch weight | PVA 100s: 0.5–1.0% of total batch weight |
Disperse PVA 100s in the batch water with SiX before adding the dry ingredients. Establish the fiber content and mechanical performance through trial batches; a PVA addition alone does not establish ECC performance.
Cementitious Calculation
At 15%: 19 lb cement + 1 lb separately added pozzolan + (2.85 lb SiX × 50%) ≈ 21.43 lb total cementitious.
At 20%: 19 lb cement + 1 lb separately added pozzolan + (3.80 lb SiX × 50%) ≈ 21.90 lb total cementitious.
Approximate planning yield: about 0.4 cu. ft., or about 5 sq. ft. at 1 inch thick. Actual yield varies with the complete batch, air content, compaction, and materials; measure your trial batch yield before estimating production quantities.
UHPC-Style High-Performance Starting Mix
A starting formulation for dense, low-water architectural and specialty precast concrete using graded sand, silica flour, reactive materials, and fibers.
UHPC-Style Dosage: 20%
For UHPC-style concrete, use 20% SiX by weight of Portland cement.
| Ingredient | 20% — Recommended UHPC-Style Dose |
|---|---|
| Portland cement | 16.5 lb |
| Silica fume | 1 lb |
| Sand — primary grading | 14 lb |
| Sand — complementary grading | 5.5 lb |
| 325-mesh silica flour | 3.5 lb |
| TruCast SiX | 3.30 lb |
| Starting water* | 5.6–5.9 lb |
| Reinforcement | PVA 100s: 0.5 |