Concrete Admixtures: Type_D
Concrete chemical admixture reference data — ASTM C494 Types A/B/C/D/E/F/G/S, ASTM C260 air-entraining, calcium nitrite corrosion inhibitors, VMA, SRA, and lithium nitrate ASR mitigation. Parameters include dosage range (mL/100 kg cement), water reduction (%), initial/final set time change (min), compressive strength effect at 1/7/28 days (%), slump increase (mm), air content change (%), and compatibility notes.
| admixture type | product class | air content change pct (%) | astm standard | common name | compatibility notes | dosage max mL per 100kg (mL/100kg-cement) | dosage min mL per 100kg (mL/100kg-cement) | dosage typical mL per 100kg (mL/100kg-cement) | set time change final min (minutes) | set time change initial min (minutes) | slump increase mm (mm) | strength 1d pct change (%) | strength 28d pct change (%) | strength 7d pct change (%) | water reduction max pct (%) | water reduction min pct (%) | water reduction typical pct (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type_D | water_reducer_retarder | 0 | ASTM C494 | Water reducing retarder (lignosulfonate-based) | Hot weather placement; extended workability retention; do not combine with Type C accelerator; monitor set in cool weather | 390 | 130 | 260 | 90 | 60 | 50 | 0 | 10 | 10 | 12 | 5 | 8 |
| Type_D | water_reducer_retarder_polycarboxylate | 0 | ASTM C494 | PCE-based water reducer retarder | High-performance variant; better water reduction than lignosulfonate; sensitive to overdose causing severe retardation | 520 | 130 | 195 | 120 | 60 | 60 | 0 | 12 | 12 | 15 | 6 | 10 |
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