Analysis Request – Concrete Production

Various chemical reactions take place between water used to mix concrete and the cement. Not only is the quality of water used responsible for the strength and durability of concrete, but the amount of water used also plays a critical role. Workability, permeability and watertightness, drying shrinkage, potential to crack and compressive strength are all controlled by the amount and quality of water used. Vinlab H2O offers a comprehensive water suitability for concrete use package providing you with the peace of mind that the water source used is sufficient.


The most important chemical parameter tested would be the pH, followed by sulphate and chloride salts. Total suspended solids are measured in water to ensure water is free from excessive amounts of impurities.


An ideal pH range of 6-8 is considered acceptable with the pH of the water having a direct impact on the final strength of the concrete. Water bodies with higher levels of dissolved salts have been shown to decrease the compressive strength of concrete. While elevated levels of chlorides show surface efflorescence, persistent dampness and makes the reinforcement steel prone to corrosion.

How often?

When making use of surface waters water from each source should be tested before the commencement of construction. Thereafter it is suitable to test water sources every three months until the work is complete. When making use of municipal water testing is only required before the commencement of construction followed by once every six months.


Always before the commencement of construction followed by every three or six months dependent on source of the water used.


Anyone who plans on using concrete for construction, be it a private residential job or larger construction sites.