Pebble and crushed stone for construction
1 Scope
This document specifies the classification and categories, general requirements, technical requirements, test methods, inspection rules, marking, storage and transportation of pebble and crushed stone for construction.
This document applies to pebble and crushed stone for cement concrete and its products for construction (except hydraulic structures).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 175 Common portland cement
GB/T 2419 Test method for fluidity of cement mortar
GB/T 6003.1 Test sieves - Technical requirements and testing - Part 1: Test sieves of metal wire cloth
GB/T 6003.2 Test sieves - Technical requirements and testing - Part 2: Test sieves of metal wire cloth
GB 6566 Limits of radionuclides in building materials
GB 8076-2008 Concrete admixtures
GB/T 14684-2022 Sand for construction
GB/T 17671 Test method of cement mortar strength (ISO method)
SL/T 352-2020 Test code for hydraulic concrete
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
pebble
rock particles with a particle size greater than 4.75mm formed due to crushing, weathering, separation, migration and sedimentation of rocks under the action of natural conditions
3.2
crushed stone
rock particles with a particle size greater than 4.75mm formed due to crushing, sieving and other mechanical processes of natural rocks, pebbles or mine waste rocks
3.3
elongated or flaky particle
pebble or crushed stone particle whose maximum one-dimensional size is 2.4 times greater than the average particle size of its particle grade is elongated particle; that whose minimum one-dimensional size is less than 0.4 times the average particle size of its particle grade is flaky particle
3.4
irregular particle
pebble or crushed stone particle whose minimum one-dimensional size is less than 0.5 times the average particle size of its particle grade
3.5
clay content in pebble
content of clay particles in pebble with size less than 75μm
3.6
clay content and fine content in crushed stone
content of clay particles in crushed stone with size less than 75μm
3.7
clay lumps and friable particles content
content of particles less than 2.36mm after water immersion, elutriation or other treatments but whose original particle sizes are greater than 4.75mm in pebble and crushed stone
3.8
soundness
ability of pebble or crushed stone to resist cracking under the action of external physical or chemical factors
3.9
alkali-aggregate reaction
expansion reaction that occurs slowly between alkali active minerals in pebble or crushed stone and concrete compositions such as cement, mineral admixtures and additives, and alkali in the atmosphere in wet environment, which leads to concrete cracking and destruction
4 Classification and categories
4.1 Classification
Stones for construction are classified into pebble and crushed stones.
4.2 Categories
Stones for construction can be classified into Categories I, II and III according to the technical requirements of clay content in pebble (clay content and fine content in crushed stone), clay lumps and friable particles content, elongated or flaky particles content, irregular particles content, sulfide and sulfate content, soundness, crushing index, continuous graded loose packing void ratio and water absorption rate.
5 General requirements
In addition to the requirements of 6.4, the harmful substances of crushed stones produced from mine waste rocks shall meet the requirements of China’s relevant standards and norms on environmental protection and safety.
6 Technical requirements
6.1 Particle grading
The particle grading of pebble or crushed stone shall meet the requirements of Table 1.
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and categories
5 General requirements
6 Technical requirements
7 Test methods
8 Inspection rules
9 Marking, storage and transportation
Pebble and crushed stone for construction
1 Scope
This document specifies the classification and categories, general requirements, technical requirements, test methods, inspection rules, marking, storage and transportation of pebble and crushed stone for construction.
This document applies to pebble and crushed stone for cement concrete and its products for construction (except hydraulic structures).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 175 Common portland cement
GB/T 2419 Test method for fluidity of cement mortar
GB/T 6003.1 Test sieves - Technical requirements and testing - Part 1: Test sieves of metal wire cloth
GB/T 6003.2 Test sieves - Technical requirements and testing - Part 2: Test sieves of metal wire cloth
GB 6566 Limits of radionuclides in building materials
GB 8076-2008 Concrete admixtures
GB/T 14684-2022 Sand for construction
GB/T 17671 Test method of cement mortar strength (ISO method)
SL/T 352-2020 Test code for hydraulic concrete
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
pebble
rock particles with a particle size greater than 4.75mm formed due to crushing, weathering, separation, migration and sedimentation of rocks under the action of natural conditions
3.2
crushed stone
rock particles with a particle size greater than 4.75mm formed due to crushing, sieving and other mechanical processes of natural rocks, pebbles or mine waste rocks
3.3
elongated or flaky particle
pebble or crushed stone particle whose maximum one-dimensional size is 2.4 times greater than the average particle size of its particle grade is elongated particle; that whose minimum one-dimensional size is less than 0.4 times the average particle size of its particle grade is flaky particle
3.4
irregular particle
pebble or crushed stone particle whose minimum one-dimensional size is less than 0.5 times the average particle size of its particle grade
3.5
clay content in pebble
content of clay particles in pebble with size less than 75μm
3.6
clay content and fine content in crushed stone
content of clay particles in crushed stone with size less than 75μm
3.7
clay lumps and friable particles content
content of particles less than 2.36mm after water immersion, elutriation or other treatments but whose original particle sizes are greater than 4.75mm in pebble and crushed stone
3.8
soundness
ability of pebble or crushed stone to resist cracking under the action of external physical or chemical factors
3.9
alkali-aggregate reaction
expansion reaction that occurs slowly between alkali active minerals in pebble or crushed stone and concrete compositions such as cement, mineral admixtures and additives, and alkali in the atmosphere in wet environment, which leads to concrete cracking and destruction
4 Classification and categories
4.1 Classification
Stones for construction are classified into pebble and crushed stones.
4.2 Categories
Stones for construction can be classified into Categories I, II and III according to the technical requirements of clay content in pebble (clay content and fine content in crushed stone), clay lumps and friable particles content, elongated or flaky particles content, irregular particles content, sulfide and sulfate content, soundness, crushing index, continuous graded loose packing void ratio and water absorption rate.
5 General requirements
In addition to the requirements of 6.4, the harmful substances of crushed stones produced from mine waste rocks shall meet the requirements of China’s relevant standards and norms on environmental protection and safety.
6 Technical requirements
6.1 Particle grading
The particle grading of pebble or crushed stone shall meet the requirements of Table 1.
Contents of GB/T 14685-2022
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and categories
5 General requirements
6 Technical requirements
7 Test methods
8 Inspection rules
9 Marking, storage and transportation
