Chemical Analysis of Concrete Admixture(IS 9103:1999 · IS 6925)
Chemical verification of concrete admixtures per IS 9103 — dry material content, ash content, relative density, pH and chloride content per IS 6925 — confirming batch consistency and chloride safety.
What is Chemical Analysis of Concrete Admixtures?
Plasticisers, superplasticisers, retarders and accelerators are dosed by the litre yet judged by the structure. IS 9103:1999 (Concrete Admixtures — Specification) defines the uniformity requirements that confirm each drum matches the approved product — dry material content, ash content, relative density, pH — and IS 6925:1973 provides the chloride determination that guards reinforcement, since chloride-bearing accelerators are prohibited near steel.
Global Lab performs the uniformity chemical suite on supplied samples and compares against the manufacturer's declared values and the approved-source record — catching watered-down, contaminated or substituted consignments before they reach the batching plant.
How the Chemical Analysis of Concrete Admixture is Conducted
- 1
Sampling
Liquid or powder admixture is sampled from the consignment with batch numbers and declared values recorded. - 2
Dry Material Content
The sample is oven-dried per the standard procedure and dry material content computed against the declared value band. - 3
Ash Content
The dried residue is ignited and ash content determined — the inorganic fingerprint of the formulation. - 4
Relative Density & pH
Liquid density (hydrometer/pyknometer) and pH are measured against declared values. - 5
Chloride Determination
Chloride content is determined per IS 6925 and assessed against the mix chloride budget for reinforced work. - 6
Reporting
Uniformity comparison against declared values with pass/fail flags is issued via Autovity QLMS.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 9103:1999 | Concrete Admixtures — Specification (Reaffirmed) | Uniformity Requirements | Indian Standard |
| IS 6925:1973 | Methods of Test for Determination of Water Soluble Chlorides in Concrete Admixtures (Reaffirmed) | Chloride Content | Indian Standard |
| IS 456:2000 | Plain and Reinforced Concrete — Code of Practice | Mix Chloride Budget | Indian Standard |