امروز : سه شنبه 17 تیر 1399
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کلماتی که امروز با آن ها آشنا خواهیم شد به شرح زیر است.
1. درشت دانه
2. خاک چسبنده
3. بتن
4. مجرا
5. پیمانکار
COARSE AGGREGATE: (1) For concrete: aggregate which retained on the No. 4 sieve (4.76 mm). (2) For bituminous material: aggregate which retained on a sieve of 3 mm square opening
COHESIVE SOIL: A sticky soil like clay or clayey silt
CONCRETE: A mixture of water, sand, stone, and a binder (Usually portland cement) whichhardens to a stonelike mass. There are four types of portland cement
Type I: Normal portland cement: This is a general-purpose cement used whenever
sulfate hazards are absent and when the heat of hydration will not produce
objectionable rises in temperature. Typical uses are sidewalks, pavement, beams
columns and culverts
Type II: Modified portland cement (Sulfate-resistant portland cement): This type
of cement is applicable when exposure to severe sulfate concentration is expected
generally used in hot weather in the construction of large concrete structures. Its heat
rate and total heat generation are lower than for normal portland cement.
Type III: High-early strength portland cement: This type develops its strength
quickly. It is suitable for use when the structure must be put into early use or when
long-term protection against cold temperatures is not feasible. Its shrinkage rate,
however, is higher than for types I and II, and extensive cracking may result.
Type IV: Low-heat portland cement: For extensive concrete structures, such as
gravity dams, low-heat cement is required to minimize the curing heat. The ultimate
strength also develops more slowly than for the other types
CONDUIT: Any open channel, pipe, etc., for flowing fluid. A pipe or tube in which smallerpipes, tubes, or electrical conductors are inserted or are to be inserted
CONTRACTOR: The person or persons, firm, partnership, corporation, or combination
thereof, private or municipal, who have entered into a contract with the State (Client)
