Heavyweight Concrete

Topics: Nuclear power, Test method, Standard Pages: 2 (274 words) Published: May 12, 2013
Uses :
producers have supplied this specialty performance ..:
1- hospitals in x-ray protection
2- bridge designers to provide counterweights on lift bridges 3- designers of nuclear power plants

Mixture proportioning:

Procedures outlined in ACI 211.1 should be used for mixture proportioning. Typical proportions for heavyweight concrete are shown in Table 2.

Cements conforming to ASTM C 150, which would be suitable for conventional concrete and produce the required physical properties, are suitable for use in heavyweight concrete.

Thorough examination and evaluation of heavyweight aggregate sources are necessary to obtain material suitable for the type of shielding required.3 These sources are limited, and a material survey should be conducted to determine availability, chemical and physical qualities Mixing water

Water and ice to be used in heavyweight concrete should conform to the requirements of ACI 301 or ASTM C 94. In addition, water should be clean and free from injurious amounts of oil, acid, alkali, organic matter, or other deleterious substances. Admixtures

Conventionally placed heavyweight concrete may contain a chemical admixture meeting ASTM C 494 requirements for Type A or D. Type F or G may also be used to improve the placeability and reduce the tendency for segregation. Control tests

Conventional heavyweight concrete—The quality of the concrete produced should be controlled by an established pro- gram of sampling and testing. This program should conform to the requirements of national standards such as ACI 318 and to the requirements of the construction specifications. Quality control tests of freshly mixed concrete should include tests of density, temperature, slump, and air content made in accor- dance with appropriate ASTM test methods.
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Concrete Essay
  • concrete technology cc203 Research Paper
  • Importance of Durability of Concrete Essay
  • Refractory Concrete Material Essay
  • Aggregates used in concrete Essay
  • Essay about Roman Pozzolanic Concrete
  • A Study of Mix Design of Concrete Hollow Blocks Using Crushed Powder Like Glass as Supplementary Aggregates Essay
  • Essay about concrete mixing equipment,concrete batching plant equipment

Become a StudyMode Member

Sign Up - It's Free