1 Scope
This standard specifies the definitions, classification and specification, technical requirements, test methods, inspection rules, symbol, storage and transportation of pebble and crushed stone for building.
This standard is applicable to the pebbles and crushed stones for cement concrete and its products in the constructional engineering; those for other engineering may also be carried out according to this standard.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB 175—1999 Portland Cement and Ordinary Portland Cement
GB/T 177—1985 Method of testing cements—Determination of strength
GB/T 2419—1994 Test method for fluidity of cement mortar
GB/T 6003.1—1997 Test sieves of metal wire cloth (eqv ISO3310-1:1990)
GB/T 6003.2—1997 Test sieves of perforated metal plate (eqv ISO3310-2:1990)
3 Definitions
This standard adopts the following definitions.
3.1 Pebble
Rock particles, particle size larger than 4.75mm, formed through natural weathering, potamic transport, sorting and stacking.
3.2 Crushed stone
Rock particles, particle size larger than 4.75mm, formed through mechanical disruption and screening of natural rock or pebble.
3.3 Elongated flaky particle
Elongated particles are those pebble and crushed stone particles whose length is larger than 2.4 times of the average particle diameter of the corresponding size fraction; flaky particles are those whose thickness is less than 0.4 times of the average particle diameter (average particle diameter refers to the average value of the upper and lower limit particle size).
3.4 Silt content
Material finer than 75 μm in pebble and crushed stone
3.5 Clay lump
Contents of particles in the pebble and crushed stone whose original particle size is larger than 4.75mm, and less than 2.36mm after immersion cleaning with water and squeezing with hands
3.6 Soundness
The ability of pebble and crushed stone to resist fracture under the action of natural weathering and other external physicochemical factors
3.7 Alkali-aggregate reaction
Expansion reaction of concrete components such as concrete and admixture, alkali in the environment, as well as alkali active mineral in the aggregate occurring slowly in the humid environment and resulting in concrete cracking damage.
GB/T 14685-2001 The following standards are cited：
