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GB 25779-2010: [GB/T 25779-2010] Loadbearing concrete perforated bricks
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Basic data | Standard ID | GB 25779-2010 (GB25779-2010) | | Description (Translated English) | [GB/T 25779-2010] Loadbearing concrete perforated bricks | | Sector / Industry | National Standard | | Classification of Chinese Standard | Q14 | | Classification of International Standard | 91.100.30 | | Word Count Estimation | 14,113 | | Date of Issue | 2010-12-23 | | Date of Implementation | 2011-11-01 | | Quoted Standard | GB 175; GB/T 1346; GB/T 1596; GB/T 2542; GB/T 4111; GB 6566; GB 8076; GB/T 14684; GB/T 14685; GB/T 17431.1; GB/T 17669.3; GB/T 17671; GB/T 18046; GB/T 18968; JGJ 63; YBJ 20584 | | Adopted Standard | ASTM C55-2006, NEQ | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 10 of 2010 (No. 165 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard specifies the load-bearing concrete brick terms and definitions, size, grade and marking, raw materials, technical requirements, test methods, inspection rules and product certification, stacking and transport. This standard applies to industrial and civil buildings and other load-bearing structure with concrete brick. | GB 25779-2010: [GB/T 25779-2010] Loadbearing concrete perforated bricks---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.
Loadbearing concrete perforated bricks
ICS 91.100.30
Q14
National Standards of People's Republic of China
Load-bearing concrete brick
Published 2010-12-23
2011-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
Foreword
Chapter 6 of this standard (except 6.3.4) are mandatory, others are recommended.
This standard Appendix A, Appendix B, Appendix C is normative.
The standard degree of consistency with the United States ASTMC55-06 "concrete building bricks" of non-equivalent.
The standard proposed by China Building Materials Federation.
This standard building materials Standardization Technical Committee (SAC/TC285) administered by the National wall, roof and road use.
This standard is drafted. Henan Building Materials Research and Design Institute Co., Ltd, China Building Block Association, Zhejiang Province, the development of new wall
Office materials, building materials Supervision and Industrial Technology Research Center.
Participated in the drafting of this standard. Xi'an Research and Design Institute of wall materials, building materials, Zhejiang Science and Technology Co., Ltd., Hai Suke building technology
Surgery Development Co., Ltd., China Building Materials Academy, Excellence (Fujian) Machinery Development Co., Ltd., Jiang Su Tengyu machinery
Ltd., Quanzhou Hongyi Machinery Manufacturing Co., Ltd., Xi'an East Fuxing Machinery Co., Ltd., Baoding Founder Hua Rui Machinery Manufacturing Co.
The company, Quanzhou peaks Machinery Manufacturing Co., Ltd., Baotou New Year REIT environmentally friendly building materials Co., Ltd. Nantong City Hengda Machinery Manufacturing Co., Ltd.
The main drafters. Chen Hongjun, Du Jiandong, to offer green, Zhou Xuan, Yang Bin, Cai Xiaobing, Wang Lili, Wang Wuxiang, Wu Chengyu, Fu Zhichang,
Jiang Huai same, Li Yang water, Ma Guanghui, Zhang Wancang, Xu Qinghui, Guo Wenzhi, Yu Yinlong.
Load-bearing concrete brick
1 Scope
This standard specifies the load-bearing concrete brick terms and definitions, size, grade and mark, raw materials, technical requirements, test methods, the subject
Inspection rules and product certification, stacking and transport.
This standard applies to industrial and civil buildings and the like load-bearing concrete brick structures.
2 Normative references
Terms of the following documents become provisions of this standard by reference in this standard. For dated reference documents, all later
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to agreements based on this standard
Whether the latest versions of these documents. For undated references, the latest version applies to this standard.
GB 175 common portland cement
GB/T 1346 Cement normal consistency, setting time, stability test method
GB/T 1596 for cement and fly ash in concrete
GB/T 2542 Test Method wall bricks
GB/T 4111 Test Methods for small concrete hollow block
GB 6566 Building materials radionuclide limits
GB 8076 concrete admixtures
GB/T 14684 building sand
GB/T 14685 building pebbles, gravel
GB/T 17431.1 lightweight aggregate and test methods - Part 1. Lightweight Aggregate
Determination of mechanical properties GB/T 17669.3 Gypsum
GB/T 17671 cement mortar strength test method (ISO method)
GB/T 18046 for granulated blast furnace slag cement and concrete
GB/T 18968 wall materials term
JGJ63 concrete water standards
YBJ20584 dry slag concrete conditions in the blast furnace lithotripsy
3 Terms and Definitions
GB/T 18968 established following terms and definitions apply to this standard.
3.1
Load-bearing concrete brick loadbearingconcreteperforatedbrick
Cement, sand, stone and the like as main raw materials, ingredients, mixing, shaping, curing is made, for the multi-hole concrete block bearing structure (in
Hereinafter referred to as. concrete brick), code-named LPB. Concrete brick Names of parts shown in Figure 1.
1 --- article surface;
2 --- pulp seat surface (outer wall surface of a small thickness of the ribs);
3 --- laid pulp surface (outer wall surface of the large thickness of the ribs);
4 --- top surface;
5 --- a length (L);
6 --- width (B);
7 --- height (H);
8 --- outer wall;
9 --- ribs.
Figure 1 concrete brick Names of parts
4 size, grade and mark
4.1 Specifications
Concrete brick hexahedral shape is a right angle, the usual brick size specifications shown in Table 1.
Table 1 Size millimeters
length Width Height
360,290,240,190,140 240,190,115,90 115,90
Other sizes may be negotiated through consultation. A thin mortar joint of masonry block type, relevant dimensions can be adjusted accordingly.
4.2 rating
Press the compressive strength is divided into MU15, MU20, MU25 three levels.
4.3 mark
Labeled products in the following order. code, size, strength grade, standard number.
Example. Size of 240mm × 115mm × 90mm, MU15 strength grade of concrete brick, mark it as.
5 raw materials
5.1 Cement
Shall comply with the provisions of GB 175.
5.2 Aggregate
5.2.1 fine aggregate
Shall comply with GB/T 14684 of.
5.2.2 coarse aggregate
Gravel, pebbles shall comply with GB/T 14685; the weight of the slag should comply YBJ20584. Coarse aggregate maximum particle size should not be
Greater than 9.5mm.
5.2.3 lightweight aggregate
Shall comply with the provisions of GB/T 17431.1 of.
5.3 Fly
Shall comply with the provisions of GB/T 1596's.
5.4 blast furnace slag
Shall comply with GB/T 18046 of.
5.5 admixtures
Shall comply with the provisions of GB 8076.
5.6 Water
Shall comply with the provisions of JGJ63.
5.7 Other material
Shall comply with the relevant standards, the relevant inspection should be done before the application of non-standard materials, meet the requirements before use.
6 Technical Requirements
6.1 appearance quality
Appearance quality should be consistent with the provisions of Table 2.
Table 2 Appearance quality millimeters
Name of Project Specifications
Bending ≤1
Missing edge off angle
Number (number) ≤2
A maximum of three directions projection size ≤15
Cumulative crack extending projection size ≤20
6.2 size bias
Size deviation shall be as specified in Table 3.
Table 3 millimeters size deviation
Name of Project Specifications
Length 2, -1
Width 2, -1
Height ± 2
Porosity of 6.3
6.3.1 porosity of not less than 25%, not greater than 35%.
6.3.2 concrete brick opening direction, on the wall to be built same direction after the pressures and brick.
6.3.3 any hole concrete brick, tile maximum value of the longitudinal direction should not exceed 1/6 of the length of the brick; brick width direction
The maximum value should be less than 4/15 the width of the brick.
6.3.4 slurry laying surface concrete brick or semi-blind holes should be a blind hole.
6.4 The minimum outer wall thickness and minimum rib
The minimum outer wall thickness should be not less than 18mm, the minimum rib thickness of not less than 15mm.
6.5 intensity level
Compressive strength shall be as specified in Table 4.
Table 4 compression strength in megapascals
power level
Compressive strength
The average value is not smaller than the minimum value not less than the monolith
MU15
MU20
MU25
15.0
20.0
25.0
12.0
16.0
20.0
6.6 The maximum water absorption
The maximum water absorption should not exceed 12%.
6.7 linear drying shrinkage and relative moisture content
Linear drying shrinkage and relative moisture content shall be as specified in Table 5.
Table 5% relative moisture content
Linear drying shrinkage
Relative water content
Moderate drying wet
≤0.045 ≤40 ≤35 ≤30
Note. Use the areas humidity conditions.
--- means a wet annual average relative humidity greater than 75% of the area;
Medium --- refers to the annual average of 50% to 75% relative humidity areas;
--- means a dried average area of less than 50% relative humidity.
6.8 frost resistance
Frost resistance shall be in accordance with Table 6.
Table 6% frost resistance
Freezing conditions index monolithic mass loss rate of loss of compressive strength monolithic
Subtropical region D15
Hot summer and cold winter area D25
Cold regions D35
Cold regions D50
≤5 ≤25
6.9 carbonation coefficient
Carbonization coefficient of not less than 0.85.
Softening coefficient 6.10
Softening coefficient of not less than 0.85.
6.11 Radioactive
Radioactive shall comply with the provisions of GB 6566.
7 Test methods
7.1 appearance quality
Appearance Quality test method according to GB/T 2542.
7.2 size bias
Size deviation test method according to GB/T 2542.
Porosity of 7.3
7.3.1 porosity of test methods according to GB/T 4111 Test Method hollowness.
7.3.2 sitting surface concrete brick slurry, measured with a caliper or ruler aperture or hole geometry, calculating the maximum hole size, using
Full comparison value, to the nearest 0.1mm.
7.4 The minimum outer wall thickness and minimum rib
The minimum outer wall thickness of the ribs and the minimum test method according to GB/T 4111.
7.5 compressive strength
Test method for compressive according to annex A.
7.6 The maximum water absorption
The maximum water absorption test method according to GB/T 4111.
7.7 linear drying shrinkage and relative moisture content
Linear drying shrinkage and relative moisture content test method GB/T 4111 for which the linear drying shrinkage test gauge length
150mm.
7.8 frost resistance
Frost resistance test methods according to GB/T 4111 for which the compressive strength test method according to Appendix A.
7.9 carbonation coefficient
Test Method carbonation coefficient according to annex B.
Softening coefficient 7.10
Test methods for softening coefficient according to annex C.
7.11 Radioactive
Radioactive carried out in GB 6566.
8 Inspection Rules
8.1 Inspection Classification
Product testing into the factory inspection and type test.
8.1.1 factory inspection
Test items. appearance quality, dimensional deviation, the minimum and the minimum rib thickness of the outer wall, the intensity level, the maximum water absorption and relative water content.
8.1.2 Type inspection
Test items are. All project technical requirements of Chapter 6. Any of the following circumstances, should be type tested.
Pattern evaluation trial a) new products;
b) for normal production, raw materials and production process of any one of the ratio change occurs;
c) Normal production, every six months (every radioactivity once a year);
d) production line shutdown recovery more than three months of production;
E) When the last delivery inspection and test patterns are quite different;
f) the national quality supervision agencies to proceed with a comprehensive inspection.
8.2 Batch rules
With the same batch of raw material, the same production technology, the same level of intensity and the same age of the 100,000 concrete brick as a group, not
Foot 100 000 also by the number of dollars.
8.3 Sampling rules
8.3.1 each batch of 50 randomly concrete brick made appearance quality and dimensional deviation test.
8.3.2 dimensional deviation from the appearance and quality inspection of concrete brick is extracted as the number of other items for inspection, the number of samples
Table 7.
TABLE 7 Sample Number of Units blocks
Test items
Number of samples
(H/B) ≥0.6 (H/B) < 0.6
Porosity of 33
The minimum outer wall thickness and minimum rib 33
Intensity level 510
The maximum water absorption of 33 and a relative moisture
Linear drying shrinkage of 33
Frost resistance 1020
Carbonation coefficient 1222
Softening coefficient 10 20
Radioactive 33
8.4 determine the rules
8.4.1 If the subject and appearance quality of concrete brick size deviation comply with the technical requirements in Table 2 and Table 3, it is judged that the concrete block
Porous brick size deviation and appearance quality qualified; otherwise unqualified.
8.4.2 If the subject of concrete brick 50, the number of blocks defective appearance quality and dimensional deviation of not more than 7, this batch is mixed
Concrete porous brick size deviation and appearance quality qualified; otherwise unqualified.
8.4.3 When the test results of all projects are in line with Chapter 6 of this standard technical requirements, then this batch of concrete brick qualified; No
It was unqualified.
9 product certification, stacking and transport
9.1 age of concrete brick factory should not be less than 28 days.
9.2 concrete brick factory, should provide product quality certification, including.
a) the name and trademark;
b) the number and lot number;
c) product labeling, production and date of manufacture;
d) type test and factory inspection report in the reporting period;
e) inspection department inspectors and signature.
9.3 should be porous brick size, age, strength grade concrete batches are stacked, should not be mixed.
9.4 should adopt concrete brick plastic film packaging, stacking, transportation and masonry, measures should be taken to rain.
9.5 concrete brick handling, non-collision, throw throw, dump dumping is prohibited.
Appendix A
(Normative)
Concrete brick compressive strength test method
A.1 equipment
A.1.1 Testing Machine
It shows the relative value of the material testing machine error should not exceed ± 1%, which can be expected to range selection failure load of the specimen falls full scale
20% to 80%. The testing machine, one end of the lower platen should be twisted ball bearings, and freely rotatable.
A.1.2 auxiliary platen
When the upper platen or the lower platen of the testing machine can not completely cover the surface of the support bearing surface of the test piece, the test machine should be placed between the platen and the specimen
As a set of auxiliary pressing plate.
Auxiliary platen length and width should be greater than the length of each test piece, a width of 6mm, a thickness of not less than 20mm. Thermally assisted platen
Surface hardness after not less than HRC40. Flatness tolerance of 0.12mm.
A.1.3 internet specimen prepared
Preparation of test piece should be flat horizontal platform, flatness within its scope the longitudinal direction should be less than 0.1mm, metal or other material can be used
Make, planar dimensions should not be less than 440mm × 240mm.
A.1.4 glass plate
Glass plate thickness not less than 6mm, the planar size and requirements of the test pieces prepared in the same platform.
A.1.5 level
Level specifications for 250mm ~ 400mm.
A.1.6 right angle ruler
One end of a right angle ruler shall be not less than the length of 120mm, the indexing is 1mm.
A.1.7 steel ruler
Specifications for steel ruler 400mm, indexing is 1mm.
A.2 specimen screed material and a binder
42.5 mortar prepared using ordinary portland cement and sand, 1.3 mass ratio, the value of water amount of water specified in GB/T 1346
Mud normal consistency.
To advance compressive strength tests, 42.5 should be used Portland cement or rapid hardening high strength gypsum powder. Lower strength should not be used
Gypsum powder model, building plaster powder.
Arbitration test should be used 42.5 ordinary portland cement.
A.2.1 rapid hardening Portland cement
The method according to GB/T 17671 a predetermined molding, curing, and testing the compressive strength of cement mortar test block. Cement mortar test block age 24h
The compressive strength of not less than 19.0MPa.
A.2.2 high-strength gypsum powder
A.2.2.1 Test for compressive strength gypsum powder predetermined GB/T 17669.3, the wet strength of not less than 2h instar
24.0MPa.
A.2.2.2 laboratory purchased high-strength gypsum powder, should be used within three months; if beyond 3 months of shelf life, should be re-compressive strength
Inspection, after passing to continue to use.
A.2.2.3 addition retarder, gypsum powder should not adding any other fillers and additives. High-strength gypsum powder supplier must provide
Retarder dosage and Mix requirements.
A.3 Specimen
A.3.1 number of specimens
Compressive strength of concrete brick number of five specimens.
A.3.2 sample handling
A.3.2.1 side porous brick concrete sample should be regular flat, irregular or if protruding ribs, need to be cut, so as to
Ensure the smooth side of the sample; sample processing sitting surface and pulp slurry paved surface, making a plane parallel to each other; holes all around the mixed sample
Concrete walls or floors should be completely closed, the compressive strength of the test piece should be regarded as monolithic concrete brick compressive strength.
A.3.2.2 After the sample at a temperature of at least (23 ± 5) ℃, relative humidity less than 80% for down to a constant weight, before proceeding specimens produced.
When scattered on a laboratory sample, the laminate can be stacked, holes should be parallel to the ground, the interval between samples is not less than 15mm. For advance
Compressive strength test, you can use electric fans to speed up the indoor air flow rate. When the mass loss after 2h of not more than the previous sample mass
0.2%, and, when there is moisture or wet phenomena see sample surface was visually observed, the sample may be considered to have a constant weight. Do not allow the use of drying
Box dried sample.
A.3.3 size measurement
Steel ruler to measure the size of each sample were measured width of the specimen (B) and length (L) in an intermediate position on both sides of the sample, averaged,
Accurate to 1mm; sample height (H) takes two values should be measured at the middle of two long side (L), are averaged to the nearest 1mm.
A.3.4 Preparation of test piece
Calculating concrete brick in the actual use state of the pressure height (H) and the minimum horizontal dimension (B) ratio, i.e., the aspect ratio (H/B).
Preparation A.3.4.1 H/B≥0.6 specimens
Using the slurry method take into test pieces, directly after the treatment as the compressive strength of the specimen.
A.3.4.1.1 first sample platform on a preparative thin coat of oil or a layer of wet paper, the stirred material is uniformly leveling the paving
Preparation of samples on the platform, the length and width of the leveling material layer should be slightly larger length and width of the sample.
A.3.4.1.2 selected concrete brick paved surface as a slurry pressure-bearing surface, the bearing surface of the sample material is pressed into the leveling layer, with a right angle on foot to
Regulation sample vertical. After sitting surface pressure slurry to at least 90 ° to the two adjacent side vertical relationship. Leveling the material thickness should be less than
3mm.
When the bearing surfaces A.3.4.1.3 final setting leveling material, the other surface of the slurry for sitting by the above method, the sample is pressed into the leveling material layer, for an
With the regulation of the surface level to level.
A.3.4.1.4 to shorten the time, immediately screeds layer side upward pressure receiving surface plated after treatment, the oil pressure on the previously coated glass
Tablet, bead edge screeds layer was observed, all air bubbles removed, and the level adjusted horizontal ruler until a uniform plane leveling mortar layer thickness
≤3mm.
Preparation of test piece A.3.4.2 H/B < 0.6 in
The method of making the blocks to take compressive strength specimens.
A.3.4.2.1 the same batch, the same size, the same two concrete brick samples pore structure, they are overlapped with an adhesive material
Bonded together. When the adhesive, and the level required to regulate right angle on foot, to maintain the sample with four sides at least two adjacent sides
It is flat. Samples after bonding should be met.
--- ≤3mm adhesive layer thickness;
--- two sample aperture substantially aligned;
--- When the upper and lower walls are inconsistent rib thickness and two samples, overlapping the adhesive should be thin and the wall thickness of the ribs on one side, with a wall and the other
Rib thick bonded to one surface.
After the adhesive material A.3.4.2.2 final setting 2h, then A.3.4.1.1, A.3.4.1.2, A.3.4.1.3, A.3.4.1.4 prepare a test piece.
A.4 specimen conservation
The prepared test piece is placed in the test chamber (20 ± 5) ℃ of conservation.
Leveling and adhesive material test piece prepared by using normal Portland cement, the compressive strength test performed after 72h;
Leveling and adhesive material using rapid hardening Portland cement test piece was prepared, after 24h compressive strength test;
Leveling and adhesive material specimens prepared using gypsum powder, compressive strength test after 2h.
A.5 Test procedure
A.5.1 the test piece on the test machine platen, try to ensure that the center of gravity and the center of the specimen testing machine platen coincides.
Note. For the hole are symmetrical to the long (L) and width (B) of the center line of the test piece, and its center of gravity coincides with the centroid; of asymmetric pass the specimen, the specimen may be in the order of
A pressing surface underlying diameter 10mm, freely rolling round bar, respectively, identify the length (L) and width (B) of the balancing shaft (central axis), is the intersection of the two axes
Center of gravity.
A.5.2 tester should be uniform smooth loading, impact or vibration should not occur. Loading rate to 4kN/s ~ 6kN/s is appropriate, until the specimen
Until damage, record the maximum failure load P.
A.6 calculation results
A.6.1 H specimen sample preparation/B≥0.6, the length of the pressure receiving surface of the test piece (L) and a width (B), according to the value A.3.3.
A.6.2 H/B < 0.6 Test sample preparation member, and pressure-receiving surface of the test piece length (L) and a width (B), takes a maximum value according to A.3.3.
A.6.3 compressive strength (Rp) test piece according to formula (A.1) is calculated accurately to 0.1MPa.
Rp = PLB
(A.1)
Where.
--- RP compressive strength specimen megapascals (MPa);
P --- maximum failure load in Newtons (N);
--- receiving surface length L, in millimeters (mm);
B --- width of the receiving surface, in millimeters (mm).
A.6.4 minimum arithmetic mean of test results and a single specimen to the compressive strength of 5 specimens represented, accurate to 0.1MPa.
Appendix B
(Normative)
Test Method for Coefficient carbonation concrete brick
B.1 equipment
B.1.1 compressive strength test equipment with A.1.
B.1.2 carbonization chamber
Specimen discharge volume at least more than one set.
Inside the environmental conditions. volume of carbon dioxide at a concentration of (20 ± 3)%, relative humidity (70 ± 5)%, a temperature of (20 ± 5) ℃.
B.2 chemical reagents
Mass concentration of 1% phenolphthalein ethanol solution with a concentration of 70 mass% ethanol formulation.
B.3 sample
The number of samples B.3.1
Aspect ratio (H/B) Number of samples ≥0.6 concrete brick 12 is two; compressive strength of a set of five comparative sample. another
Group 7 carbide test sample, wherein the test 2 for carbonation.
Aspect ratio (H/B) < 0.6 Number of samples of concrete brick 22; 10 is the compressive strength of a set of comparative sample. Another group
12 is a carbonation test sample, wherein the test 2 for carbonation.
B.3.2 sample handling
Sample handling with A.3.2.
B.4 Test procedure
B.4.1 The test sample was placed carbide carbonation tank carbonization test, the sample spacing not less than 20mm; compressive strength of Comparative sample discharge
Opposing environmental conditions. relative humidity (70 ± 5)%, temperature (20 ± 5) ℃.
After carbonization B.4.2 7D, the same will be the case of a test sample carbonized at about 50mm split ends per day, with a concentration of 1% phenol
Phthalate in ethanol carbonation depth inspection, when the cross-sectional center of the test sample is not red color, both the test sample is completely carbonized, the carbonized tank that
All samples have been carbonized, carbonized end of the trial; if the test sample cross-sectional center was red, both the test sample has not been completely carbonized, should continue into the
Carbonizing test until the end 28d carbonation test.
B.4.3 The entire sample is completely carbonized or carbonized 28d yet fully carbonized, compressive strength and Comparative Sample Press A.3.3,
A.3.4, A.4, A.5 prepared specimens, the conservation and compressive strength tests.
B.5 calculation results
Concrete brick coefficients are carbonized formula (B.1) is calculated to the nearest 0.01.
KC = RCR
(B.1)
Where.
KC --- concrete brick carbonation coefficient;
The arithmetic average of the compressive strength after RC --- 5 th carbide specimens megapascal...
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