Concrete Mixtures 7

Chemicals That Damage Concrete

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Natural drinkable water without a pronounced odor or taste is suitable as mixing water for concrete. Mixing water should contain less than 2000 ppm of dissolved solids. Sodium carbonate in the water causes rapid setting. Sodium and potassium bicarbonates can speed up or slow down setting times. Large concentrations of carbonates and bicarbonates in the water can reduce concrete strength. Chloride ions from salt can corrode embedded steel and sulphates can cause expansion and deterioration of the concrete. Manganese, zinc, tin, copper and lead salts can reduce concrete strength and change setting times. Sea water will corrode reinforced steel and prestressed concrete, and react with the alkalies in some aggregates.  Water containing alkali, organic material, sugar, oil and algae can reduce concrete strength.

 Concrete Mixtures Links

1.The Materials In Concrete.
2.Concrete Aggregates - Concrete Slump.
3.Concrete Placement - Vibration - Hydration.
4.Types of Portland Cement - Concrete Moisture & Cracking.
5.Watertight Concrete - Supplementary Cementing Materials.
6.Supplementary Cementing Materials.
7.Chemicals That Damage Concrete.
8.Concrete Aggregate Properties.
9.Angular & Smooth Aggregate Properties.
11.Admixtures Continued.
12.Air Entraining Admixtures.
13.Air Entraining Admixtures Continued.
14.Conditions Affecting Concrete Air Volume.
15.Superplasticizers & Other Admixtures.
16.Ordering & Mixing Concrete.
17.Concrete Mixing - Subgrade Preparation.
18.Subbase Preparation - Concrete Placement.
19.Concrete Consolidation.
20.Concrete Finishing.
21.Concrete Curing.
22.Hot Weather Concreting.
23.Cold Weather Concreting.
24.Concrete Slump Test.

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