This code is applicable to the mix design of masonry mortar used in industrial and civil buildings and general structures. JGJ 98-2000 Masonry Mortar Mix Design Code JGJ98-2000 Standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Specification for mix proportion designof masonry mortar
JGJ98-2000
J65-2000
2001Beijing
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Specification for mix proportion designof masonry mortar
JGJ98-2000
Editor: Shaanxi Provincial Architectural Science Research and Design InstituteApproval Department: Ministry of Construction of the People's Republic of ChinaImplementation Date: 2001 April 1st
2001 Beijing
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the Release of the Industry Standard "Mix Ratio Design Code for Masonry Mortar"
Construction Standard [2000] No. 303
According to the requirements of the Ministry of Construction's "Notice on Issuing the 1999 Engineering Construction, Urban Construction, and Construction Industry Standard Formulation and Revision Plan" (Construction Standard [1999] No. 309), the "Mix Ratio Design Code for Masonry Mortar" edited by Shaanxi Provincial Architectural Science Research and Design Institute has been reviewed and approved as an industry standard, numbered JGJ98-2000, and will be implemented from April 1, 2001. The original industry standard "Mix Ratio Design Code for Masonry Mortar" JGJ/T98-96 will be abolished at the same time.
This standard is managed by the China Academy of Building Research, the technical unit responsible for building engineering standards of the Ministry of Construction, and is interpreted by the Shaanxi Provincial Building Science Research and Design Institute. It is published by the China Building Industry Press organized by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
December 28, 2000
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
According to the requirements of the Ministry of Construction's Construction Standards [1999] No. 309, the code compilation team has revised this code through extensive investigation and research, carefully summarizing practical experience, and on the basis of extensive solicitation of opinions.
The main technical contents of this code are: 1 General Principles; 2 Terms and Symbols; 3 Material Requirements; 4 Technical Conditions; 5 Calculation and Determination of Masonry Mortar Mix Ratio. The main technical contents of the revision are: 1. Solve the problem of insufficient cement content calculated for cement mortar in the original code; 2. Add control methods for admixtures in masonry mortar.
This code is managed by the China Academy of Building Research, the technical unit responsible for building engineering standards under the Ministry of Construction, and the main editor is authorized to be responsible for specific interpretation. The main editor of this code is: Shaanxi Building Science Research and Design Institute (Address: No. 272, North Section of Huancheng West Road, Xi'an, Postal Code: 710082) The participating units of this code are: Fujian Building Science Research Institute Shandong Building Science Research Institute
Baoji First Construction Engineering Company
Zhejiang Jiashan County Construction Engineering Quality Supervision Station Jinan Sijian Group Co., Ltd.
The main drafters of this code are: Li Rong, Zhang Zhao, He Xiquan, Liu Yanning, Geng Jiayi, Huang Xichun, Jin Yumin, Yuan Huixing, Lu Jinfa5
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
Terms and Symbols
2.1 Terminology
2.2 Symbols
3 Material requirements
Technical conditions
····.6
Calculation and determination of masonry mortar mix ratio
5.1 Calculation of cement mortar mix ratio
5.2 Selection of cement mortar mix ratio
5.3 Trial preparation, adjustment and determination of mix ratio
Terms used in this code
Engineering Construction Standard Full-text Information System
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Engineering Construction Standard Full-text Information System
1.0.1 This code is formulated to unify the technical conditions and mix ratio design methods of masonry mortar, achieve economic rationality and ensure the quality of masonry mortar. 1.0.2 This code is applicable to the mix ratio design of masonry mortar used in industrial and civil buildings and general structures.
1.0.3Mortar mix design shall be calculated based on the performance of raw materials, technical requirements of mortar and construction level and determined after trial mixing. 1.0.4When designing the mix ratio according to this code, in addition to complying with the provisions of this code, it shall also comply with the provisions of the relevant national mandatory standards in force. 1
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
mortar
2.1.1Mortar
Terms and symbols
A construction material made of binder, fine aggregate, admixture and water, which plays the role of bonding, lining and stress transfer in construction projects. 2.1.2Masonry mortar
masonrymortar
Mortar that bonds bricks, stones, blocks, etc. into masonry. 2.1.3 Cement mortar
cement mortar
Mortar made of cement, fine aggregate and water. 2.1.4 Composite mortar
Mortar made of cement, fine aggregate, admixtures and water. 2.1.5 Materials mixed in mortar Inorganic materials added to improve the workability of mortar, such as lime paste, calcium carbide, fly ash, clay paste, etc.
2.1.6 Calcium carbidesludge The product filtered after calcium carbide is digested. ? Admixtures
Material added during the mortar mixing process to improve the performance of mortar. 2.2 Fu
——Average compressive strength of mortar.
fmo—Test strength of mortar.
0—Standard deviation of mortar on-site strength.
fek——Strength value corresponding to cement strength grade. fe——Measured strength of cement.
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
3 Material Requirements
3.0.1 The strength grade of cement used for masonry mortar should be selected according to design requirements. The strength grade of cement used in cement mortar should not be greater than grade 32.5; the strength grade of cement used in cement mixed mortar should not be greater than grade 42.5. 3.0.2 Medium sand should be used for masonry mortar, and coarse sand should be used for rough stone masonry. The mud content of sand should not exceed 5%. For cement mixed mortar with strength grade M2.5, the mud content of sand should not exceed 10%.
3.0.3 The admixtures shall comply with the following provisions:
1 When quicklime is slaked into lime paste, it shall be filtered with a mesh with a pore size of no more than 3mm×3mm, and the slaking time shall not be less than 7d; the slaking time of ground quicklime powder shall not be less than 2d. Measures shall be taken to prevent the lime paste stored in the sedimentation tank from drying, freezing and contamination. It is strictly forbidden to use dehydrated and hardened lime paste. 2 When clay or sub-clay is used to prepare clay paste, it is advisable to use a mixer to add water and sieve through a mesh with a pore size of no more than 3mm×3mm. When the organic matter content in clay is identified by colorimetry, it should be lighter than the standard color.
3 The calcium carbide slag used to make calcium carbide gypsum shall be filtered with a mesh with a pore size of no more than 3mm×3mm. During inspection, it shall be heated to 70℃ and kept for 20min. It can only be used after there is no acetylene smell.
Slaked lime powder shall not be used directly in masonry mortar. 3.0.4 The consistency of lime paste, clay paste and calcium carbide gypsum during trial mixing should be 120 ± 5mm.
The quality index of fly ash and ground quicklime should meet the requirements of the national standard "Fly ash used in cement and concrete" (GB1596-91) and the industry standard "Building quicklime powder" (JC/T480-92). 3.0.6 The water used for preparing mortar should meet the requirements of the current industry standard "Standard for water for concrete mixing" JGJ63.
3.0.7 The mortar admixture added to masonry mortar should have a masonry strength type inspection report issued by a statutory testing agency, and can only be used after passing the mortar performance test.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
4 Technical Conditions
4.0.1 The strength grade of masonry mortar should be M20, M15, M10, M7.5, M5, M2.5.
4.0.2 The density of cement mortar mixture should not be less than 1900kg/m; the density of cement mixed mortar mixture should not be less than 1800kg/m. : The consistency, stratification and test compressive strength of masonry mortar must meet the requirements at the same time. 4.0.3
The consistency of masonry mortar should be selected according to the provisions of Table 4.0.4. Table 4.0.4
Masonry typewww.bzxz.net
Sintered ordinary brick masonry
Consistency of masonry mortar
Mortar consistency (mm)
Lightweight aggregate concrete small hollow block masonrySintered porous brick, hollow brick masonry
Sintered ordinary brickFlat arch lintel
Hollow bucket wall, barrel arch
Ordinary concrete small hollow block masonry
Aerated concrete block masonry
Stone masonry
The stratification of masonry mortar shall not be greater than 30mm. 60~90
4.0.6 The amount of cement in cement mortar shall not be less than 200kg/m; the total amount of cement and admixtures in cement mixed mortar should be 300-350kg/m. 4.0.7 For masonry mortar with freeze-thaw cycle requirements, after freeze-thaw test, the mass loss rate shall not exceed 5%, and the compressive strength loss rate shall not exceed 25%. 4.0.8 Mechanical stirring shall be used for trial mixing of mortar. The mixing time shall be calculated from the end of feeding and shall comply with the following provisions: 1 For cement mortar and cement mixed mortar, it shall not be less than 120s; for mortar mixed with fly ash and admixtures, it shall not be less than 180s. 2
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Calculation and determination of masonry mortar mix ratio
5.1 Calculation of cement mixed mortar mix ratio
5.1.1 The determination of mortar mix ratio shall be carried out according to the following steps: 1 Calculate the trial strength of mortar fm. (MPa); 2 Calculate the cement content Q per cubic meter of mortar according to the formula (5.1.4-1) of this specification. (kg);
Calculate the amount of admixture Q per cubic meter of mortar according to the cement content Q. (kg); 3
Determine the amount of sand per cubic meter of mortar Qs (kg); 4
Select the amount of water per cubic meter of mortar Qw (kg) according to the consistency of the mortar; 5
Carry out mortar trial mixing;
Determine the mix ratio.
The trial strength of the mortar should be calculated according to the following formula: fm.=f2+0.645g
Wherein, fmo——trial strength of mortar, accurate to 0.1MPa; f——average compressive strength of mortar, accurate to 0.1MPa; 0——standard deviation of on-site strength of mortar, accurate to 0.01MPa. 5.1.3
The determination of the standard deviation of the on-site strength of masonry mortar shall comply with the following provisions: 1 When statistical data are available, it shall be calculated according to the following formula: g
wherein fm,i—the strength of the nth group of specimens of the same type of mortar within the statistical period, MPa; m—the average strength of n groups of specimens of the same type of mortar within the statistical period6
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