GB/T 14982-2008Fireclay refractory mortars (English PDF)

Foreword

This standard replaces GB/T 14982-1994 "Fireclay refractory mortar". Compared with GB/T 14982-1994, the main technical differences of this standard are as follows: -- Modify the refractoriness indicator; -- Designation of phosphate binding refractory mortar is changed by P; -- Adjust the heating permanent linear-change rate for designations NN-30 and NN-38; -- Adjust the heating permanent linear-change test-temperature for designations NN-42, NN-45 and NN-45P. This standard was proposed by and shall be under the jurisdiction of National Refractory Material Standardization Technical Committee. Drafting organizations of this standard. MCC Wuhan Ye Jian Technology Co., Ltd. AND Wuhan Weilin lining material Co., Ltd. Main drafters of this standard. Fang Changrong, Su Boping, Xie Zhaohui, Lei Qingyun, Peng Yan and Li Bo. The historical version replaced by this standard is as follows: -- GB/T 14982-1994. Fireclay refractory mortars

1 Application Scope

China's national product standard for fireclay refractory mortar - the material that joins refractory bricks in a furnace lining. It specifies the classification, the technical requirements, the test methods, the inspection rules, and the marking, packaging, transport and storage of fireclay refractory mortars. The mortar is the smallest part of a lining and the one that limits its life. A brick lining is only as good as its joints: the joint is where hot gas, slag or metal penetrates, where thermal movement concentrates, and where a lining begins to fail. And the mortar is not simply a filler - it has to behave enough like the brick for the two to move together, which means its refractoriness, its thermal expansion and its composition must match the brick it is bedding, or it will spall out and leave an open joint the first time the furnace cycles. That is why refractory mortars are classified and sold to match the brick class rather than as a general-purpose product. The standard therefore covers the classification by refractoriness and by bonding type - the air-setting mortars that harden by a chemical bond at ambient temperature and the heat-setting ones that develop strength only when fired - and sets the requirements: the refractoriness, the chemical composition, the particle size, the workability and water demand, the bonding time, the cold and hot bonding strength, and the linear change on reheating, which is what determines whether the joint stays tight. The test methods and the sampling and acceptance rules complete it. Issued on 30 October 2008 and in force since 1 July 2009, it replaces GB/T 14982-1994.

This standard specifies the fireclay refractory mortar's classification, technical requirements, test methods, quality evaluation procedures, packaging, marking, transportation, storage and quality certificate. This standard applies to fireclay refractory mortars that are used for fireclay bricks.

2 Normative References

The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.

GB/T 6900 Chemical analysis of alumina-silica refractories

GB/T 7322 Refractory products - Determination of pyrometric cone equivalent (refractoriness)

GB/T 15545 Unshaped refractory - Packing, marking, transportation and storage

GB/T 17617 Refractory products - Sampling of raw materials and unshaped products

GB/T 22459.3 Refractory mortars - Part 3. Determination of joint stability

GB/T 22459.4 Refractory mortars - Part 4. Determination of flexural bonding strength

GB/T 22459.5 Refractory mortars - Part 5. Determination of grain size distribution (sieve analysis)

GB/T 22459.7 Refractory mortars - Part 7. Determination of properties at elevated temperatures

3 Classification

Fireclay refractory mortar, according to physiochemical properties, are divided into 5 designations. NN-30, NN-42, NN-45, NN-45P. N and N represent the first letters of

7 Packaging, marking, transportation, storage and quality

7.1 Packaging, marking, transportation and storage shall comply with GB/T 15545.

7.2 The liquid binder may be packaged in plastic drums and delivered separately.