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Mixing Water for Concrete. Typical Water Analyses, ppm ChemicalsCity waterSeawater Silica (SiO 2 )0 to 25— Iron (Fe)0 to 0.2— Calcium (Ca)1 to 10050.

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Presentation on theme: "Mixing Water for Concrete. Typical Water Analyses, ppm ChemicalsCity waterSeawater Silica (SiO 2 )0 to 25— Iron (Fe)0 to 0.2— Calcium (Ca)1 to 10050."— Presentation transcript:

1 Mixing Water for Concrete

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3 Typical Water Analyses, ppm ChemicalsCity waterSeawater Silica (SiO 2 )0 to 25— Iron (Fe)0 to 0.2— Calcium (Ca)1 to 10050 to 480 Magnesium (Mg)0 to 30260 to 1410 Sodium (Na)1 to 2252190 to 12,200 Potassium (K)0 to 2070 to 550 Bicarbonate (HCO 3 )4 to 550— Sulfate (SO 4 )2 to 125580 to 2810 Chloride (Cl)1 to 3003960 to 20,000 Nitrate (NO 3 )0 to 2— Total dissolved solids 20 to 100035,000

4 Mixing Water for Concrete Atomic Absorption Spectrophotometer

5 Mixing Water for Concrete Acceptance Criteria for Questionable Water Supplies LimitsTest method Compressive strength, minimum percentage of control at 7 days 90 ASTM C 109 or AASHTO T 106 Time of set, deviation from control, hr:min. from 1:00 earlier to 1:30 later ASTM C 191 or AASHTO T 131 ASTM C 94 or AASHTO M 157

6 Mixing Water for Concrete Chemical Limits for Mixing Water Chemical or type of construction Concentration, Max. ppmTest method Chloride, as Cl ASTM D 512 Prestressed concrete or concrete in bridge decks 500 Other reinforced concrete containing aluminum or dissimilar metals or galvanized metal forms 1,000 Sulfate, as SO 4 3,000 ASTM D 516 Alkalies, as (Na 2 O + 0.658 K 2 O)600 Total solids50,000 AASHTO T 26 ASTM C 94 or AASHTO M 157

7 Mixing Water for Concrete ACI 318 Limits for Chloride Ion Content in Concrete n Prestressed concrete 0.06% n Reinforced concrete exposed to chloride in service 0.15% n Reinforced concrete that will be dry or protected from moisture in service 1.00% n Other reinforced concrete construction 0.30%

8 Mixing Water for Concrete Acid Waters

9 Mixing Water for Concrete Wash Water

10 Mixing Water for Concrete Video Water


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