Standard No.:	GB/T 14902-2003
English Name:	Ready-mixed concrete
Chinese Name:	预拌混凝土
Chinese Classification:	Q13    Concrete, aggregate, plaster and mortar
Professional Classification:	GB    National Standard
ICS Classification:	91.100.30 91.100.30    Concrete and concrete products 91.100.30
Issued by:	AQSIQ
Issued on:	2003-7-1
Implemented on:	2003-12-1
Status:	superseded
Superseded by:	GB/T 14902-2012 Ready-mixed concrete
Superseded on:	2013-9-1
Superseding:	GB 14902-1994 Read y- mixed concrete
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	100.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the definitions, classification, mark, technical requirements, supply volume, test methods, inspection rules and order and delivery for ready-mixed concrete. This standard is applicable to ready-mixed concrete produced by centralized mixing station. This standard does not include the concrete pouring, vibrating and curing after concrete is conveyed to delivery place. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments (excluding amending error in the text) to, or revisions of, any of these publications do not be applied. However, the parties whose enter into agreement according to these specifications are encouraged to research whether the latest editions of these references are applied or not. For undated references, the latest edition of the normative document is applicable to this standard. GB1596 Fly Ash Used for Cement and Concrete GB6566 Limits of Radionuclides in Building Materials GB8076 Concrete Admixture GB/T9142 Concrete Mixers GB/T18046 Ground Granulated Blast Furnace Slag Used for Cement and Concrete GB/T50080 Standard for Test Method of Performance on Ordinary Fresh Concrete GB/T50081 Standard for Test Method of Mechanical Properties on Ordinary Concrete GB50119 Code for Utility Technical of Concrete Admixture GB50204 Code for Acceptance of Constructional Quality of Concrete Structures GBJ82 Testing Methods for Long-Term and Long-Lasting Performance of Ordinary Concrete GBJ107 Inspection and Evaluation of Concrete Strength JGJ52 Standard for Technical Requirements and Test Method of Sand for Ordinary Concrete JGJ53 Technical Requirements and Test Method of Gravel and Crushed Stone for Ordinary Concrete JGJ55 Specification for Mix Proportion Design of Ordinary Concrete JGJ63 Standard of Mixing Water for Concrete JGJ/T112 Technical Specification for Application of Natural Zeolite Powder in Concrete and Mortar JG/T5094 Truck Mixer 3 Terms and Definitions The following terms and definitions are applicable to this standard. 3.1 Ready-mixed concrete Concrete mixtures, after which are measured and mixed at the mixing station with a certain percentage of the cement, aggregate, water and admixture and mineral admixture that mixed according to requirements, are sold through transport cart within specified time conveying to places of using. 3.2 Normal concrete Ready-mixed concrete, with no other specific requirements, whose strength grade is less than or equal to C50, slump is less than or equal to 180mm and maximum nominal grain sizes (coarse aggregate) are 20mm, 25mm, 31.5mm and 40mm 3.3 Special concrete Ready-mixed concrete, with special requirements, and whose indexes exceed specialized range of special concrete 3.4 Delivery place A ready-mixed concrete delivered place where is ensured in the contract between supply and demand parties 3.5 Inspection at manufacturer Inspections for ready-mixed concrete quality before going out of the factory 3.6 Inspection at delivery place Inspections for ready-mixed concrete quality at delivery place 4 Classification and Mark 4.1 Classification According to features, ready-mixed concrete shall be divided into normal concrete and special concrete. 4.1.1 Normal concrete Normal Concrete shall specify the concrete strength grade, slump and maximum nominal grain size(coarse aggregate) under the following ranges: Strength grade: less than or equal C50; Slump (mm): 25, 50, 80, 100, 120, 150, 180. Maximum nominal grain size (coarse aggregate) (mm): 20, 25, 31.5, 40. 4.1.2 Special concrete Special Concrete shall specify the concrete strength grade, slump and maximum nominal grain size(coarse aggregate) or other specific requirements. Besides ranges that normal concrete specifies, the concrete strength grade, slump and maximum nominal grain size(coarse aggregate) shall also be specified in the following ranges: Strength grade: C55, C60, C65, C70, C75 C80. Slump: less than or equal to 180mm. Maximum nominal grain size (coarse aggregate) (mm): less than 20mm and more than 40mm.

1 Scope 2 Normative References 3 Terms and Definitions 4 Classification and Mark 5 Raw Materials and Mix Proportion 6 Quality Requirements for Ready-mixed Concrete 7 Preparation 8 Supply volume 9 Test Methods 10 Inspection Rules 11 Order and Delivery