ASTM C Standard Specification for Lightweight Aggregates for Concrete Masonry Units. Lab ID: Use Evaluate lightweight materials intended for use in. ASTM C/CM: Standard Specification for Lightweight Aggregates for Concrete Masonry Units. ASTM C/CM Standard Specification for Lightweight Aggregates for Concrete Masonry Units. standard by ASTM International, 06/15/.
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Concrete aggregates, consisting asm sand and gravel, represent the grain skeleton of the concrete. All cavities within this skeleton have to be filled with binder paste as complete as possible. Optimum use of the aggregate size and quality improves the concrete quality.
Aggregates can occur naturally fluvial or glacialindustrially produced like lightweight aggregates as well as recycled aggregates. For high-quality concrete they are cleaned and graded in industrial facilities by mechanical processes such as crushing, washing, screening and mixing together.
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Concrete aggregates should have a strong bond with the hardened cement paste, should not interfere with the cement hardening, and should not have negative effect on concrete durability. In Europe aggregates are defined in standard EN This standard is very comprehensive and to give more details than in the list below would be outside the scope of this document. The particle size is expressed by the hole size of the test sieves just passed by the particle concerned.
It is of high importance to design a reasonable combination of the different materials and their corresponding fractions in order to achieve a continuous combined grading curve. ASTM C33 Standard Specification for Concrete Aggregates defines the requirements for grading and quality of fine and coarse aggregate for use in concrete. Fine aggregate shall consist of natural sand, manufactured sand, or a combination thereof.
Fine aggregate shall be free of injurious amounts of organic impurities. Fine aggregate for use in concrete that will be subject to wetting, extended exposure to humid atmosphere, or contact with moist ground shall not contain any materials that are deleteriously reactive with the alkalis in the cement in amount sufficient to cause excessive expansion of mortar or concrete.
Fine aggregate subjected to five cycles of the soundness test shall have a required weighted average loss. Coarse aggregate shall consist of gravel, crushed gravel, crushed stone, air-cooled blast furnace slag, or crushed hydraulic-cement concrete, or a combination thereof. Two general types of lightweight aggregates are covered by this specification: The aggregates shall be composed predominately of lightweight-cellular and granular inorganic material.
Lightweight aggregates shall be tested, and should not contain excessive amounts of deleterious substances; and should conform to the specified values of organic impurities, aggregate staining, aggregate loss of ignition, clay lumps and friable particles, loose bulk density, compressive strength, drying shrinkage, pop-outs, and resistance to freezing and thawing.
ASTM C Standard Specification for Aggregates for Radiation-Sielding Concrete covers special aggregates for use in radiation-shielding concretes in which v331 or high specific gravity, or both, are of prime consideration. Important terms from the standard with additional notes: Aggregate Mix Aggregate consisting of a mixture of coarse and fine adtm sand.
An aggregate mix can be produced without prior separation into coarse and fine aggregates or by combining coarse and asym aggregates sand. Recycled aggregate Aggregate made from mechanically processed inorganic material previously used as a building material i.
Filler rock flour Aggregate predominantly passing the 0. Fine aggregate sand Designation for smaller size fractions with D not greater than 4 mm.
ASTM C 331—05 Specification for Lightweight Aggregates for Concrete Masonry Units (PDF Download)
Coarse aggregate Name description for larger size fractions with D not less than 4 mm and d not less than 2 mm. Fines Proportion ast an aggregate passing the 0. Granulometric composition Particle size distribution, expressed as the passing fraction in percent by weight through a defined number of sieves. Passing fraction, particle size distribution curves The particle size is expressed by the hole size of the test sieves just passed by the particle concerned.
Aggregates prepared by expanding, pelletizing, or sintering products such as blast-furnace slag, clay, diatomite, fly ash, shale, or slate; and Aggregates prepared by processing natural materials, such as pumice, scoria, or tuff The aggregates shall be composed predominately of lightweight-cellular and granular inorganic material.
Aggregates covered by this specification include: C3331 mineral aggregates of either high density or high fixed water content, or both. These include aggregates that contain or consist predominately of materials such as barite, magnetite, hematite, ilmenite, and serpentine. Synthetic aggregates such as iron, steel, ferrophosphorus and boron frit or other boron compounds see Descriptive Nomenclature C Fine aggregate consisting of natural or manufactured sand including high-density minerals.
Coarse aggregate may consist of crushed ore, crushed stone, or synthetic products, or combinations or mixtures thereof. From natural deposits, e. Material round or crushed e.
ASTM C Lightweight Aggregates for Concrete Masonry Units | CTLGroup
V331 as barytes, iron ore, steel granulate for heavy concrete e. Such as expanded clay, pumice, polystyrene for lightweight concrete, insulating concretes. Such as quartz, carborundum for granolithic concrete surfacing. From crushed old concrete etc. Coarse and fine normal weight aggregates.
Lightweight aggregates for structural concrete Lightweight aggregates for masonry concrete Lightweight aggregates for insulating concrete.