When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting time must be not less than 1 hour and final setting time less than 12 hours, within a 25 percent variability from the results with distilled water. Mortar cubes made with test water must achieve at least 90 percent of the compressive strength of those with distilled water.

Testing for impurities, such as chlorides, sulfates, total solids, alkalis, etc, is critical, as concentrations must not exceed established limits to ensure concrete quality. When seawater is utilized, the concrete's long-term compressive strength must not be over 15 percent lower than that of freshwater-prepared concrete. Moreover, performance tests simulating natural wetting and drying are employed to check for potential staining, a necessary step to verify the water's suitability for curing without compromising the concrete's appearance.

Du chapitre 5:

article

Now Playing

5.8 : Testing Water Quality

Aggregates and Water

73 Vues

article

5.1 : Unsoundness of Aggregate due to Volume Change

Aggregates and Water

67 Vues

article

5.2 : Deleterious Substances in Aggregate

Aggregates and Water

101 Vues

article

5.3 : Sieve Analysis and Grading Curves

Aggregates and Water

174 Vues

article

5.4 : Fineness Modulus

Aggregates and Water

116 Vues

article

5.5 : Types of Aggregate Grading

Aggregates and Water

211 Vues

article

5.6 : Maximum Size of Aggregate

Aggregates and Water

39 Vues

article

5.7 : Quality of Water

Aggregates and Water

55 Vues

article

5.9 : Aggregates Classification

Aggregates and Water

271 Vues

article

5.10 : Shape and Texture of Coarse Aggregate

Aggregates and Water

135 Vues

article

5.11 : Bonding and Strength of Aggregate

Aggregates and Water

105 Vues

article

5.12 : Toughness and Hardness of Aggregate

Aggregates and Water

177 Vues

article

5.13 : Specific Gravity of Aggregate

Aggregates and Water

140 Vues

article

5.14 : Bulk Density of Aggregate

Aggregates and Water

329 Vues

article

5.15 : Porosity and Absorption of Aggregate

Aggregates and Water

196 Vues

See More

JoVE Logo

Confidentialité

Conditions d'utilisation

Politiques

Recherche

Enseignement

À PROPOS DE JoVE

Copyright © 2025 MyJoVE Corporation. Tous droits réservés.