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GB 50203-2011: Code for acceptance of constructional quality of masonry structures
Status: Valid GB 50203: Evolution and historical versions
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Code for acceptance of constructional quality of masonry structures
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GB 50203-2011
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Code for acceptance of construction quality of masonry engineering
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Code for construction and acceptance of masonry engineering
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PDF similar to GB 50203-2011
Standard similar to GB 50203-2011 GB 55007 GB/T 50081 GB 50204 GB 50924 Basic data | Standard ID | GB 50203-2011 (GB50203-2011) | | Description (Translated English) | Code for acceptance of constructional quality of masonry structures | | Sector / Industry | National Standard | | Classification of Chinese Standard | P24 | | Classification of International Standard | 91.080.30 | | Word Count Estimation | 94,996 | | Date of Issue | 2011-02-18 | | Date of Implementation | 2012-05-01 | | Older Standard (superseded by this standard) | GB 50203-2002 | | Quoted Standard | GB 50300; GB 175; GB 6566; GB 8076; JGJ 28; JGJ 52; JGJ 63; JGJ/T 104; JGJ/T 164; JC 474; JC/T 479; JC/T 480 | | Regulation (derived from) | Ministry of Housing and Urban Notice No. 936 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This Chinese standard applies to the construction of brick, stone, masonry and other small block construction quality acceptance. This standard does not apply to rail, road and hydraulic construction masonry works. | GB 50203-2011: Code for acceptance of constructional quality of masonry structures---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to strengthen the quality management of construction projects, unify the acceptance of construction quality of masonry structure projects, and ensure the quality of projects, this specification is formulated.
1.0.2 This specification is applicable to the construction quality acceptance of masonry structures such as bricks, stones and small blocks in construction projects. This code is not applicable to stone masonry projects such as railways, highways and hydraulic structures.
1.0.3 The technical documents and contract in the construction of masonry structure shall not be lower than the requirements of this code for construction quality acceptance.
1.0.4 This specification shall be used in conjunction with the current national standard GB 50300 "Unified Standard for Construction Quality Acceptance of Construction Engineering".
1.0.5 The acceptance of construction quality of masonry structure engineering shall not only comply with this specification, but also comply with the current relevant national standards.
2 terms
2.0.1 masonry structure
A structure in which walls and columns made of blocks and mortar are used as the main force-bearing components of the building. It is a general term for brick masonry, block masonry and stone masonry structures.
2.0.2 reinforced masonry
A structure in which reinforced masonry is used as the main force-bearing member of a building. Reticulated reinforced masonry column, horizontally reinforced masonry wall, brick masonry and reinforced concrete surface layer or reinforced mortar surface layer combined masonry column (wall), brick masonry and reinforced concrete structural column combined wall and reinforcement A general term for small block masonry shear wall structures.
2.0.3 Block masonry units
The general term for various bricks, stones and small blocks used in masonry.
2.0.4 small block small block
Blocks whose main specification height is greater than 115mm but less than 380mm, including ordinary concrete small hollow blocks, lightweight aggregate concrete small hollow blocks, autoclaved aerated concrete blocks, etc. Referred to as small blocks.
2.0.5 products age products age
Sintered bricks out of the kiln; Autoclaved bricks and autoclaved aerated concrete blocks out of the kettle; Concrete bricks and concrete small hollow blocks are formed to a certain date.
2.0.6 special mortar for auto-claved aerated concrete block
The mortar that matches the performance of autoclaved aerated concrete and can meet the construction requirements of autoclaved aerated concrete block masonry and the performance of masonry is divided into autoclaved aerated concrete block bonding suitable for thin ash masonry method Mortar; autoclaved aerated concrete block masonry mortar suitable for non-thin gray masonry.
2.0.7 ready-mixed mortar ready-mixed mortar
Wet-mix mortar or dry-mix mortar produced by professional manufacturers.
2.0.8 category of construction quality control level
Classification of construction technical level according to several elements of quality control and quality assurance.
2.0.9 blind seam
There is no masonry mortar between adjacent blocks in masonry, and the horizontal or vertical joints are in contact with each other.
2.0.10 Suppositious seam
In order to cover up the inherent quality defects of the masonry mortar joints, mortar is only applied near the surface of the masonry when masonry is built, and there is no vertical mortar joint inside.
2.0.11 continuous seam
Vertical mortar joints in masonry where the overlapping length of the upper and lower cortex blocks is less than the specified value.
2.0.12 Relative moisture content comparatively percentage of moisture
The ratio of moisture content to water absorption.
2.0.13 The method of thin-layer mortar masonry
The autoclaved aerated concrete block is used to bond the mortar to the construction method of the autoclaved aerated concrete block wall, and the thickness of the horizontal mortar joint and the width of the vertical mortar joint are 2 mm to 4 mm. Referred to as thin gray masonry method.
2.0.14 core column
The columns formed by pouring concrete in the holes of the small block walls include plain concrete core columns and reinforced concrete core columns.
2.0.15 entity detection in-situ inspection
The testing unit with testing qualifications adopts standard testing methods to conduct in-situ testing on engineering entities or take samples for testing in laboratories.
3 Basic Regulations
3.0.1 The materials used in masonry structure engineering should have product qualification certificates and product performance type inspection reports, and the quality should meet the requirements of current relevant national standards. Blocks, cement, steel bars, and admixtures should still have re-inspection reports on the main properties of the materials, and should meet the design requirements. It is strictly forbidden to use materials that are explicitly eliminated by the state.
3.0.2 Before the construction of the masonry structure project, the construction plan of the masonry structure project shall be prepared.
3.0.3 The elevation and axis of the masonry structure shall be drawn from the datum control point.
3.0.4 Before laying the foundation, the setting-out size should be checked, and the allowable deviation should meet the requirements in Table 3.0.4.3.0.5 The templates in the expansion joints, settlement joints and anti-seismic joints shall be removed cleanly, and no debris such as mortar, blocks and debris shall be contained.
3.0.6 The order of masonry shall meet the following requirements.
1 When the elevation of the base is different, it should be built from the low place, and should be built from the high place to the low place. When there is no requirement in the design, the lap length L should not be less than the height difference H of the foundation bottom, and the lower foundation within the lap length range should be enlarged for masonry (Figure 3.0.6);
2 The corners and junctions of masonry should be built at the same time, and if they cannot be built at the same time, they should be left and connected according to regulations.
3.0.7 The masonry wall should be provided with a scale rod.
3.0.8 Leave a temporary construction hole on the wall, its side should not be less than 500mm from the junction wall, and the net width of the hole should not exceed 1m. The locations of temporary construction openings for buildings in areas with seismic fortification intensity of 9 degrees shall be determined in conjunction with the design unit. Temporary construction openings should be repaired.
3.0.9 Scaffolding eyes shall not be installed on the following walls or parts.
1 120mm thick wall, clear water wall, material stone wall, independent column and attached wall column;
2 Within the range of the triangle forming an angle of 60° with the lintel on the lintel and within the height range of 1/2 of the net span of the lintel;
3 The wall between windows with a width less than 1m;
4 The stone masonry on both sides of the door and window openings is 300mm, and other masonry is within.200mm; the stone masonry at the corner is 600mm, and other masonry is within 450mm;
5 Under the beam or beam pad and within the range of 500mm left and right;
6 The design does not allow the setting of hand eyes;
7 lightweight walls;
8 Sandwich composite wall outer leaf wall.
3.0.10 When repairing the scaffolding, the mortar and dust falling in the scaffolding should be removed; the bricks and filling bricks at the scaffolding should be moistened and filled with mortar.
3.0.11 The openings, grooves, and pipes required by the design shall be properly set aside or pre-buried during masonry. Without the consent of the design, it is not allowed to drill the wall or dig horizontal grooves on the wall. The upper part of the opening with a width exceeding 300mm shall be provided with reinforced concrete lintels. Pipelines should not be buried in load-bearing walls and independent columns whose section length is less than 500mm.
3.0.12 For walls or columns that have not yet constructed floors or roofs, the allowable free height against wind shall not exceed the regulations in Table 3.0.12.If the limit value in the table is exceeded, effective measures such as temporary support must be adopted.
3.0.13 After laying the foundation or each floor, the axis and elevation of the masonry should be checked. Within the allowable deviation range, the axis deviation can be corrected on the top surface of the foundation or on the floor, and the elevation deviation should be corrected by adjusting the thickness of the upper masonry mortar joints.
3.0.14 The top surface of the masonry on which the prefabricated beams and slabs rest shall be flat and of the same elevation.
3.0.15 Masonry construction quality control grades are divided into three grades, which shall be classified according to Table 3.0.15.
3.0.16 The anticorrosion of steel bars in masonry structures (including tie pieces or steel bars between inner and outer leaf walls of sandwich composite walls) shall meet the design requirements.
3.0.17 In rainy days, it is not advisable to build walls in the open air, and the walls built on rainy days should be covered. When continuing the construction, the verticality of the wall should be checked. If the verticality exceeds the allowable deviation, it should be removed and rebuilt.
3.0.18 During masonry construction. Floor and roof stacking loads shall not exceed the allowable load value of the floor slab. When the construction load at the material inlet of the construction layer is large, temporary support measures should be taken under the floor slab.
3.0.19 Under normal construction conditions, the daily building height of brick masonry and small block masonry should be controlled within 1.5m or the height of one-step scaffolding; stone masonry should not exceed 1.2m.
3.0.20 The division of masonry structure engineering inspection lot shall meet the following requirements at the same time.
1 The type of material used and the strength grade of the same type of material are the same;
2 No more than 250m3 masonry;
3 One floor of main structure masonry (foundation masonry can be counted as one floor); when the amount of infill wall masonry is small, multiple floors can be combined.
3.0.21 When inspecting and accepting masonry structure engineering inspection batches, the main control items shall all comply with the provisions of this specification; 80% or more of the general items shall comply with the provisions of this specification; for items with allowable deviations, the maximum tolerance The value is 1.5 times the allowable deviation.
3.0.22 During the random inspection of inspection batches in sub-projects of masonry structures, the minimum sample size of each sampling item shall be determined as not less than 5 unless there are special requirements.
3.0.23 During the masonry process of the wall, when the block is bumped or needs to be moved after the initial setting of the masonry mortar, the mortar should be removed before grouting and masonry.
3.0.24 The quality acceptance of sub-project inspection batches can be filled in according to the corresponding record sheets in Appendix A of this specification.
4 masonry mortar
4.0.1 The use of cement shall comply with the following regulations.
1 When the cement enters the site, its type, grade, packaging or bulk warehouse number, date of delivery, etc. should be inspected, and its strength and stability should be re-inspected. Its quality must meet the current national standard "General Portland Cement" GB 175 the relevant regulations
2 When there is any doubt about the quality of the cement during use or the cement has been out of the factory for more than three months (more than one month for rapid hardening Portland cement), the test should be re-checked and used according to the re-test results
3 Cement of different varieties shall not be mixed.
4.0.10 The mortar mixed on site should be used immediately after mixing, and the mixed mortar should be used within 3 hours; when the highest temperature exceeds 30°C during construction, it should be used within 2 hours. The use time of ready-mixed mortar and special mortar for autoclaved aerated concrete blocks should be determined according to the instructions provided by the manufacturer.
4.0.11 The wet-mixed mortar used in masonry structure engineering must be stored in a non-absorbent special container except for direct use, and measures such as sunshade, heat preservation, and rain and snow protection should be taken according to the climatic conditions. It is strictly forbidden to add water to the mortar during storage.
4.0.12 The acceptance standard of strength of masonry mortar test blocks shall meet the following requirements.
1 The average strength value of the mortar test block of the same acceptance batch should be greater than or equal to 1.10 times the design strength grade value;
2 The minimum group average value of the compressive strength of mortar test blocks of the same acceptance batch should be greater than or equal to 85% of the design strength grade value.
Note.
1 For the acceptance batch of masonry mortar, there should be no less than 3 groups of mortar test blocks of the same type and strength grade; when there are only 1 or 2 groups of test blocks for the same acceptance batch of mortar, the average compressive strength of each group of test blocks should be greater than or It is equal to 1.10 times of the value of the design strength grade; for buildings with a safety grade of building structure of Class I or a design service life of 50 years or more, the number of mortar test blocks in the same acceptance batch shall not be less than 3 groups;
2 The strength of the mortar shall be subject to the standard maintenance, and the compressive strength of the test block at 28d age;
3 The consistency of the mortar used to make the mortar test block should be consistent with the mix ratio design.
Sampling inspection quantity. for each inspection batch of ordinary masonry mortar of various types and strength levels not exceeding 250m3 masonry, each mixer shall be inspected at least once. Acceptance batches of ready-mixed mortar and special mortar for autoclaved aerated concrete blocks can be sampled in 3 groups.
Inspection method. random sampling at the discharge port of the mortar mixer or at the discharge port of the wet-mixed mortar storage container to make mortar test blocks (for the mortar mixed on site, only one group of test blocks should be used for the mortar in the same plate), and the test blocks should be maintained for 28 days Then do the strength test. The consistency of the wet-mixed mortar in the ready-mixed mortar should be sampled and inspected when entering the site.
4.0.13 When the following situations occur during construction or during acceptance, the on-site inspection method can be used to physically test the strength of the mortar or masonry and determine its strength.
1 The mortar test block lacks representativeness or the number of test blocks is insufficient;
2 Doubts or disputes about the test results of the mortar test block;
3 The test results of the mortar test block cannot meet the design requirements;
4 In the event of an engineering accident, further analysis of the cause of the accident is required. 5 Brickwork
5.1 General provisions
5.1.1 This chapter applies to masonry projects such as sintered ordinary bricks, sintered porous bricks, concrete porous bricks, concrete solid bricks, autoclaved lime-sand bricks, and autoclaved fly ash bricks.
5.1.2 The bricks used on the surface of dry walls and columns shall have neat corners and uniform color.
5.1.3 When building masonry, the product age of concrete porous bricks, concrete solid bricks, autoclaved lime-sand bricks, autoclaved fly ash bricks and other blocks shall not be less than 28 days.
5.1.4 In areas with frost heaving environment and conditions, porous bricks should not be used for masonry below the ground or below the moisture-proof layer.
5.1.5 Bricks of different varieties shall not be mixed on the same floor.
5.1.6 When laying sintered ordinary bricks, sintered porous bricks, autoclaved lime-sand bricks, and autoclaved fly ash bricks, the bricks should be moderately moistened 1d to 2ds in advance, and dry bricks or bricks in a state of water absorption are strictly prohibited. For buildings, the degree of wetness of the blocks should meet the following requirements.
1 The relative moisture content of sintered blocks is 60% to 70%;
2 Concrete porous bricks and concrete solid bricks do not need to be wetted with water, but in the case of dry and hot climate, it is advisable to spray water to moisten them before masonry. The relative water content of other non-sintered blocks is 40% to 50%.
5.1.7 When masonry is built by grouting method, the length of grouting shall not exceed 750mm; when the temperature exceeds 30°C during construction, the length of grouting shall not exceed 500mm.
5.1.8 The uppermost skin brick of each layer of the 240mm thick load-bearing wall, the horizontal surface of the brick masonry step and the outer skin brick of the pick-out layer shall be laid with whole bricks.
5.1.9 The mortar joints of arched and flat arched lintels should be wedge-shaped joints, the width of the mortar joints at the bottom of the arch should not be less than 5mm, the width of the mortar joints at the top of the vault should not be greater than 15mm, and the longitudinal and transverse mortar joints of the arch body should be filled concrete mortar; the underside of the arch foot of the flat-arched lintel should extend into the wall by no less than 20mm; the bottom of the brick-built flat-arched lintel should have 1% arching.
5.1.10 When the formwork and its support at the bottom of the brick lintel are removed, the strength of the mortar shall not be lower than 75% of the design strength.
5.1.11 The holes of porous bricks should be built perpendicular to the pressure-bearing surface. The back cover of semi-blind perforated bricks should face up.
5.1.12 There should be no blind seams, transparent seams and false seams in the vertical gray seams.
5.1.13 When repairing temporary breaks in brick masonry construction, the surface of the joints must be cleaned, sprinkled with water, and filled with mortar to keep the mortar joints straight.
5.1.14 The masonry of sandwich composite walls shall meet the following requirements.
1 When the wall is built, measures should be taken to prevent mortar and sundries from falling in the cavity;
2 The setting of anchors shall meet the design requirements, and the length of anchors placed on the leaf wall shall not be less than 2/3 of the thickness of the leaf wall, and shall not be less than 60mm;
3 The variety and performance of thermal insulation materials should meet the design requirements. The pouring pressure of thermal insulation materials should not have adverse effects on masonry strength, deformation and appearance quality. 5.2 Master Control Project
5.2.1 The strength grade of bricks and mortar must meet the design requirements.
Sampling inspection quantity. for each manufacturer, every 150,000 pieces of sintered ordinary bricks and concrete solid bricks, and every 100,000 pieces of sintered porous bricks, concrete porous bricks, autoclaved lime-sand bricks and autoclaved fly ash bricks shall be an acceptance batch. If it is less than the above-mentioned quantity, it is counted as one batch, and the random inspection quantity is one group. The random inspection quantity of mortar test blocks shall comply with the relevant provisions of Article 4.0.12 of this code.
Inspection method. check brick and mortar test block test report
5.2.2 The mortar of the masonry mortar joints should be dense and full, the mortar fullness of the horizontal mortar joints of the brick wall shall not be less than 80%; the fullness of the horizontal mortar joints and vertical mortar joints of the brick columns shall not be less than 90%.
Quantity of spot checks. no less than 5 spot checks per inspection batch.
Inspection method. Use a 100-grid grid to check the bonding trace area between the bottom surface of the brick and the mortar, test 3 bricks at each place, and take the average value.
5.2.3 The corners and junctions of brick masonry shall be built at the same time, and separate construction of inner and outer walls without reliable measures is strictly prohibited. In areas with seismic fortification intensity of 8 degrees and above, the temporary breaks that cannot be built at the same time but must be left behind should be built with oblique frames, and the horizontal projection length of ordinary brick masonry oblique frames should not be less than 2/3 of the height. The length-to-height ratio of the perforated brick masonry should not be less than 1/2.The height of the ramp shall not exceed the height of one-step scaffolding.
Quantity of spot checks. no less than 5 spot checks per inspection batch.
Inspection method. observation inspection
5.2.4 For non-seismic fortifications and temporary breaks in areas with seismic fortification intensity of 6 and 7 degrees, when it is not possible to keep slanted trusses, except for the corners, straight trusses can be kept, but the straight trusses must be made into convex ones, and should be Add tie reinforcement, tie reinforcement should meet the following requirements.
1 Place 1Φ6 tie bars for every 120mm wall thickness (2Φ6 tie bars should be placed for 120mm thick walls);
2 The distance along the wall shall not exceed 500mm, and the vertical distance deviation shall not exceed 100mm;
3.The embedding length shall not be less than 500mm on each side from the place where the fortification remains, and shall not be less than 1000mm in areas with seismic fortification intensity 6 and 7;
4 There should be a 90° hook at the end (Figure 5.2.4).
Quantity of spot checks. no less than 5 spot checks per inspection batch.
Inspection method. observation and ruler inspection.
5.3 General items
5.3.1 The brick masonry assembly method should be correct, the inside and outside are built together, and the upper and lower joints are staggered. There shall be no through-joints in the clear water wall and the wall between the windows; there shall be no through-joints with a length greater than 300mm in the muddy water wall, and each joint with a length of.200mm-300mm shall not exceed 3, and shall not be located on the same wall. Brick columns shall not adopt the wrapping method.
Quantity of spot checks. no less than 5 spot checks per inspection batch.
Inspection method. observation inspection. Sampling inspection of masonry assembly method should be 3m ~ 5m for each place.
5.3.2 The mortar joints of brick masonry shall be horizontal and vertical, uniform in thickness, the thickness of horizontal mortar joints and the width of vertical mortar joints should be 10mm, but not less than 8mm, nor greater than 12mm.
Quantity of spot checks. no less than 5 spot checks per inspection batch.
Inspection method. the thickness of the horizontal mortar joints is converted by the height of the brick masonry measured by a ruler of 10; the width of the vertical mortar joints is converted by the length of the masonry measured by a ruler of 2m.
5.3.3 The allowable deviation and inspection of brick masonry size and position shall comply with the provisions in Table 5.3.3.
6 Concrete Small Hollow Block Masonry Project
6.1 General provisions
6.1.1 This chapter applies to masonry projects such as ordinary concrete small hollow blocks and lightweight aggregate concrete small hollow blocks (hereinafter referred to as small blocks).
6.1.2 Before construction, the flat and elevation plan of small blocks should be compiled according to the house design drawing, and the construction should be carried out according to the block plan during construction.
6.1.3 The product age of small blocks used in construction shall not be less than 28d.
6.1.4 When building small blocks, the surface dirt should be removed, and the small blocks with unqualified appearance quality should be removed.
6.1.5 For masonry of small blocks, special small block masonry mortar should be selected.
6.1.6 For the masonry below the ground floor or below the moisture-proof layer in the ground floor, concrete with a strength grade not lower than C20 (or Cb20) shall be used to fill the holes in the small blocks.
6.1.7 For masonry of ordinary concrete small hollow blocks, it is not necessary to water and moisten the small blocks. In case of dry and hot weather, it is advisable to spray water to moisten them before masonry; for small lightweight aggregate concrete blocks, It should be watered and moistened in advance, and the relative moisture content of the block should be 40% to 50%. Construction is not allowed in rainy days and when there is floating water on the surface of small blocks.
6.1.8 The small blocks used in the load-bearing wall should be complete, free from damage and cracks
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