Standard No.:	GB/T 28294-2024
English Name:	Iron and steel slag composite materials
Chinese Name:	钢铁渣复合料
Professional Classification:	GB    National Standard
Issued by:	SAMR; SAC
Issued on:	2024-06-29
Implemented on:	2025-1-1
Status:	to be valid
Superseding:	GB/T 28294-2012 Steel slag composite material
Language:	English
File Format:	PDF
Word Count:	10500 words
Price(USD):	315.0
Delivery:	via email in 1~5 business day

Iron and steel slag composite materials 1 Scope This document specifies the components and materials, strength grades and codes, technical requirements, test methods, inspection rules, packaging, marking, transportation, and storage of iron and steel slag composite materials. This document is applicable to composite materials with iron and steel slag as the main raw material, including iron and steel slag cementitious materials for engineering construction, steel slag composite materials for road concrete, and ordinary mortar. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions 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/T 176 Methods for chemical analysis of cement GB/T 203 Granulated blast furnace slag used for cement production GB/T 208 Test method for determining cement density GB/T 750 Autoclave method for soundness of portland cement GB/T 1345 The test sieving method for fineness of cement GB/T 1346 Test methods for water requirement of normal consistency, setting time and soundness of the portland cement GB/T 2419 Test method for fluidity of cement mortar GB 5085.3 Identification standards for hazardous wastes - Identification for extraction toxicity GB/T 5483 Natural gypsum GB 6566 Limits of radionuclides in building materials GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 8074 Testing method for specific surface of cement - Blaine method GB/T 9774 Sacks for packing cement GB/T 12573 Sampling method for cement GB/T 14684 Sand for construction GB/T 17671 Test method of cement mortar strength (ISO method) GB/T 21371 By-product gypsum used in cement GB/T 21372 Portland cement clinker GB/T 51003 Technical code for application of mineral admixture JC/T 727 Apparatus for determining normal consistency and setting time of cement paste YB/T 022 Steel slag used for cement 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 iron and steel slag composite materials material compounded with steel slag and granulated blast furnace slag as main raw materials Note: They include steel slag composite materials and iron and steel slag cementitious materials. 3.2 steel slag composite materials material composed of steel slag with a particle size of less than 4.75 mm and a composite agent, wherein the composite agent is finely ground from granulated blast furnace slag, gypsum, and Portland cement clinker in a certain proportion 3.3 iron and steel slag cementitious materials hydraulic cementitious material made from steel slag, granulated blast furnace slag, and gypsum as raw materials, ground and processed in a certain proportion 4 Components and materials 4.1 Components 4.1.1 Steel slag composite materials The composition of steel slag and composite agent in the steel slag composite material is about 1.5:1, where the composite agent includes 70% to 95% (mass fraction) of granulated blast furnace slag, 0% to 5% (mass fraction) of gypsum, and 5% to 25% (mass fraction) of Portland cement clinker. 4.1.2 Iron and steel slag cementitious materials The mass fractions of steel slag, granulated blast furnace slag, and gypsum in the iron and steel slag cementitious material are 20% to 50%, 30% to 65%, and 10% to 20% respectively. 4.2 Materials 4.2.1 Steel slag The steel slag shall meet the requirements of YB/T 022. 4.2.2 Granulated blast furnace slag The granulated blast furnace slag shall meet the requirements of GB/T 203, and the quality fraction of glass shall not be less than 85%. 4.2.3 Natural gypsum The gypsum shall meet the requirements of Grade II or above as specified in GB/T 5483. 4.2.4 Industrial by-product gypsum The industrial by-product gypsum shall meet the requirements of GB/T 21371. 4.2.5 Portland cement clinker The Portland cement clinker shall meet the requirements of common cement clinker specified in GB/T 21372. 5 Strength grades and codes 6 Technical requirements 7 Test methods 8 Inspection rules 9 Packaging, marking, transportation and storage Annex A (Normative) Method for determination of water requirement of normal consistency, setting time, and mortar strength of steel slag composite materials Annex B (Normative) Test method for boiling soundness and autoclave soundness of steel slag composite material

Contents Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Components and materials 5 Strength grades and codes 6 Technical requirements 7 Test methods 8 Inspection rules 9 Packaging, marking, transportation and storage Annex A (Normative) Method for determination of water requirement of normal consistency, setting time, and mortar strength of steel slag composite materials Annex B (Normative) Test method for boiling soundness and autoclave soundness of steel slag composite material