In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful organic matter or algae, which could adversely affect the concrete's properties. The permissible limits for these impurities vary as per different standards like BS 3148:1980, BS EN 1008:2002 and ASTM C 1602–06. Silt content, if high, can be mitigated by allowing the water to stand in a settling basin, and wash water from concrete mixers can be reused if clean. Although potable water can also be suitable for curing, it's crucial that curing water lacks impurities like free carbon dioxide, which can erode hardened concrete, and iron or organic matter that may cause staining. The use of seawater, while considered for regions with freshwater scarcity, poses risks like reinforcement corrosion and efflorescence, thereby being generally inadvisable for mixing or curing. Thus, while water quality requirements for concrete mixing and curing are stringent, some flexibility exists based on the concrete application and environmental considerations.
From Chapter 5:
Now Playing
Aggregates and Water
67 Views
Aggregates and Water
75 Views
Aggregates and Water
120 Views
Aggregates and Water
201 Views
Aggregates and Water
172 Views
Aggregates and Water
277 Views
Aggregates and Water
48 Views
Aggregates and Water
82 Views
Aggregates and Water
288 Views
Aggregates and Water
150 Views
Aggregates and Water
115 Views
Aggregates and Water
199 Views
Aggregates and Water
163 Views
Aggregates and Water
357 Views
Aggregates and Water
225 Views
See More
Copyright © 2025 MyJoVE Corporation. All rights reserved