Admixtures Design

Select and dose chemical admixtures per ASTM C494 / ACI 212 β€” Water reducers, retarders, accelerators, air-entrainers, and specialty products

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Admixture Selection & Dosing
Match admixtures to project requirements. Calculate dosages, check compatibility, and verify compliance with ASTM C494 / EN 934.

🎯 Admixture Selection Guide

Β°C
mm

βš–οΈ Admixture Dosage Calculator

πŸ“Š Mix Parameters
kg/mΒ³
kg/mΒ³
kg/mΒ³
mm

βš—οΈ Admixture Compatibility Matrix

Type A
Water Reducer		 Type B
Retarder		 Type C
Accelerator		 Type D
WR+Retarder		 Type E
WR+Accelerator		 Type F
HRWR		 Type G
HRWR+Retarder		 Air Entrainer Corrosion
Inhibitor		 Shrinkage
Reducer		 VMA
βœ… Compatible Combinations
Water Reducers + Air Entrainers (standard). HRWR + Retarder (Type G). Corrosion Inhibitor + most WR/HRWR. Shrinkage Reducer + WR/HRWR.
⚠️ Caution Required
Accelerator + Retarder (counteract). High HRWR + Air Entrainer (overdose risk). Silica Fume + HRWR (dosage sensitivity). Calcium Chloride + Corrosion Inhibitor (incompatible).
πŸ”¬ Testing Protocol
Always trial batch (ASTM C494). Test: slump, air, set time, strength at 1/3/7/28 days. Check for segregation, bleeding, finishing issues. Verify 28-day strength β‰₯ 90% of reference.
πŸ“‹ Documentation
Record: admixture brand, type, dosage, lot #. Cement type, SCM, source. Mix proportions. Test results. Submit to engineer for approval per project specs.

πŸ“š Admixture Standards Reference

ASTM C494 / C494M
Chemical Admixtures for Concrete
Type A (WR), B (Retarder), C (Accelerator), D (WR+Retarder), E (WR+Accel), F (HRWR), G (HRWR+Retarder), S (Specific Performance). Physical properties, sampling, testing, certification.
Dose: per mfr data sheet, typical 0.5-3% by cement weight
ASTM C260
Air-Entraining Admixtures
Vinsol resin, synthetic detergents, fatty acids. Produce stable microscopic air bubbles. Required for F/T exposure. Dose: 0.01-0.1% cement weight.
Target air: 4-7% (adjust for aggregate, temp, pump)
ASTM C1017
Flowing Concrete Admixtures
Self-consolidating concrete (SCC). High flowability, passing ability, stability. Polycarboxylate-based HRWR + VMA. Slump flow 600-800mm.
HRWR: 1-2.5% | VMA: 0.02-0.1% cement weight
EN 934-2
European Admixture Standard
CE marking required. Categories: water reducing, retarding, accelerating, air-entraining, superplasticizing. Performance-based classification.
Declared by manufacturer per EN 934-2 tables
ACI 212.3R
Chemical Admixtures Guide
Comprehensive guide: selection, dosage, effects on properties, compatibility, testing, specifications. Essential reference for engineers.
Reference document, not a specification
ECP 203 Annex
Egyptian Admixture Requirements
Approved admixture list. Local climate adjustments. Required testing: compatibility with local cements, long-term durability.
Per approved manufacturer list
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