Ordinary Concrete

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Chapter 4

• Ordinary Concrete

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4.2 Ingredient of Ordinary Concrete

• 4.2.1 Cement
• 4.2.2 Aggregate
• 4.2.3 Water
• 4.2.4 Concrete Admixture

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4.2.3 Water

• The water for blending concrete must be the clean
  water. The waste water, whose PHlt4 or sulphate
  containment goes beyond, must not be used.
• The water must not be used to blend reinforced
  concrete and prestressed concrete, whose
  sulphate,chloride and sulphide containment goes
  beyond.
• Limit of the matter in water are listed in
  Tab4.2.9.

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Tab.4.2.9 Limit of The Matter in Water
Types Prestressed concrete Reinforced concrete Plain concrete
PH ?4 ?4 ?4
Insoluble matter (mg/L) ?2000 ?2000 ?5000
Soluble matter(mg/L) ?2000 ?5000 ?10000
Cl-(mg/L) ?500 ?1200 ?3500
SO42-(mg/L) ?600 ?2700 ?2700
S2- (mg/L) ?100 --- ---
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Containing Water Content (esp. Saturated Water
Content)
Fig.4.2.5 Saturated Water Content