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JG/T 408-2019

Chinese Standard: 'JG/T 408-2019'
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JG/T 408-2019English299 Add to Cart Days<=3 Cementitious grout for sleeve of rebar splicing Valid JG/T 408-2019
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BASIC DATA
Standard ID JG/T 408-2019 (JG/T408-2019)
Description (Translated English) (Sleeve grouting for reinforcing steel connection)
Sector / Industry Building & Construction Industry Standard (Recommended)
Word Count Estimation 15,154
Date of Issue 2019-10-28
Date of Implementation 2020-06-01
Older Standard (superseded by this standard) JG/T 408-2013
Regulation (derived from) Industry Standard Record Monthly Report No. 3, 2020 (Total No. 239)

JG/T 408-2019
Cementitious grout for sleeve of rebar splicing
ICS 91.080.40
P25
JG
The People's Republic of China Construction Industry Industry Standard
Replace JG/T 408-2013
Sleeve Grouting for Rebar Connection
Issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China
Table of contents
Foreword...Ⅱ
1 Scope...1
2 Normative references...1
3 Terms and definitions...2
4 Materials...2
5 Requirements...2
6 Test method...4
7 Inspection rules...5
8 Delivery and acceptance...5
9 Marking, packaging, transportation and storage...6
Appendix A (Normative Appendix) Flow Test...7
Appendix B (Normative Appendix) Compressive Strength Test...8
Appendix C (Normative Appendix) Vertical Expansion Rate Test...9
Appendix D (Normative Appendix) Self-drying shrinkage test...12
Preface
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is a revision of JG/T 408-2013 "Sleeve Grouting for Reinforcement Connection", and is in line with JG/T 408-2013 "Sleeve Grouting for Reinforcement Connection"
Compared with grouting material, the main technical content changes are as follows.
---Added normal temperature type sleeve grouting material and low temperature type sleeve grouting material, deleted the definition of grouting sleeve for steel bar connection (see section 3
chapter);
--Added the content of the material chapter (see Chapter 4);
- Deleted the original 5.1.1, modified the range of the difference between the vertical expansion rate of 3h, 24h and 3h, and added the 28d self-drying shrinkage index
Requirements, increase the temperature usage requirements and performance index table of low-temperature sleeve grouting material (see Chapter 5);
--- Increase the molding and maintenance requirements of low-temperature sleeve grouting material, modify the fluidity test requirements, and increase the self-drying shrinkage test
Inspection requirements (see Chapter 6);
--Added the factory inspection items of low temperature type sleeve grouting material, and revised the judgment rules (see Chapter 7);
- Delete the requirement that each bag (tube) has a net content of 50kg (see Chapter 9);
--- Added the non-contact measurement method of vertical expansion rate of normal temperature sleeve grouting material (see Appendix C);
--- Increase the self-drying shrinkage test (see Appendix D).
This standard was proposed by the Standard Rating Institute of the Ministry of Housing and Urban-Rural Development.
This standard is under the jurisdiction of the Engineering Quality Standardization Technical Committee of the Ministry of Housing and Urban-Rural Development.
The organization responsible for drafting this standard. Beijing Yugou Co., Ltd.
Participated in the drafting of this standard. Beijing Prefabricated Construction Engineering Research Institute Co., Ltd., China Building Research Institute Co., Ltd., Beijing
Construction Engineering Research Institute Co., Ltd., China Metallurgical Construction Research Institute Co., Ltd., Beijing Sida Jianmao Technology Development Co., Ltd., Southeast University
Science, Jiangsu Subote New Materials Co., Ltd., China Construction Second Bureau Third Construction Engineering Co., Ltd., China Power Construction Chizhou Changzhi Construction Co., Ltd.,
Beijing Yantong Building Components Co., Ltd., Shanghai Urban Construction Materials Co., Ltd., Tongji University, Beijing University of Architecture and Construction, Wuhan Yuanjin Building Materials Technology
Co., Ltd., Hebei Daoda Building Material Technology Co., Ltd., Shenzhen Modern Construction Technology Co., Ltd., Beijing Building Materials Inspection and Research Institute
Co., Ltd., Shenyang Jianzhu University, Rongtai Construction Group Co., Ltd., Weifang Construction Engineering Quality and Safety Supervision Station, Beijing Urban Construction Group
Limited liability company.
The main drafters of this standard. Jiang Qinjian, Liu Hao, Huang Qingjie, Wu Huanjuan, Wang Xiaofeng, Li Xiaoyang, Li Chenguang, Wang Wanjin, Zhu Qinghua,
Qian Guanlong, Zhang Yamei, Li Jun, Sha Jianfang, Wang Zhijun, Zhao Yong, Qin Lian, Li Chongzhi, Gu Mingwang, Li Junliang, Hou Weihong, Wang Tao, Meng
Xianhong, Wu Shihong, Zhang Kai, Guan Chunsheng, Zhang Yi.
The previous versions of the standard replaced by this standard are as follows.
--JG/T 408-2013.
Sleeve Grouting for Rebar Connection
1 Scope
This standard specifies the terms and definitions, materials, requirements, test methods, inspection rules, delivery and inspection of sleeve grouting material for steel bar connection.
Collection, marking, packaging, transportation and storage.
This standard applies to cement-based grouting materials used for sleeve grouting of ribbed steel bars.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB 175 General Portland Cement
GB/T 2419 Method for measuring fluidity of cement mortar
GB 8076 concrete admixture
GB/T 8077 Test method for homogeneity of concrete admixtures
GB 12573 Cement sampling method
GB/T 14684 Sand for construction
GB/T 17671 Cement mortar strength inspection method (ISO method)
GB 20472 sulphoaluminate cement
GB/T 23439 Concrete Expansion Agent
GB/T 50080 Standard Test Method for Performance of Ordinary Concrete Mixture
JC/T 681 Planetary cement mortar mixer
JG J 63 Concrete Water Standard
JG/T 223 Polycarboxylic acid series high performance water reducer
3 Terms and definitions
The following terms and definitions apply to this document.
Cement is the basic material, with fine aggregates, and a dry mixture composed of concrete admixtures and other materials. Referred to as "sleeve irrigation
Slurry". The material has good fluidity, early strength, high strength, micro-expansion and other properties after being stirred with water. It is filled between the sleeve and ribbed steel
In the gap, a reinforced sleeve grouting connection joint is formed.
3.2 Normal temperature type cementitious grout for sleeve
It is suitable for sleeve grouting whose ambient temperature at the grouting part within 24h during grouting construction and maintenance is not lower than 5℃.
3.3 low temperature type cementitious grout for sleeve
It is suitable for sleeve grouting with the ambient temperature range of -5℃~10℃ at the grouting part within 24h during grouting construction and curing.
4 materials
4.1 Cement
The cement should be Portland cement and ordinary Portland cement, and should meet the requirements of GB 175, and the sulfoaluminate cement should meet the requirements of GB 20472.
Provisions.
4.2 Fine aggregate
The fine aggregate should be natural sand, which should meet the requirements of GB/T 14684, and the maximum particle size should not exceed 2.36mm.
4.3 Concrete admixture
The concrete admixture should meet the requirements of GB 8076, GB/T 23439 and JG/T 223.
4.4 Other materials
All other materials in the product formula should comply with the current national product standards.
5 requirements
5.1 General requirements
5.1.1 The sleeve grout should be prepared according to the water consumption required by the product design (instructions). The mixing water should meet the requirements of JG J 63.
5.1.2 When using normal temperature sleeve grouting material, the ambient temperature of the grouting part within 24h during the construction and maintenance process should not be lower than 5℃.
When using low-temperature sleeve grouting, the ambient temperature of the grouting part within 24h during the construction and maintenance process should not be lower than -5℃, and should not exceed
Over 10°C.
5.2 Performance requirements
5.2.1 The performance of normal temperature sleeve grouting material should meet the requirements of Table 1.
5.2.2 The performance of the low-temperature sleeve grouting material should meet the requirements of Table 2.
6 Test method
6.1 General requirements
6.1.1 The temperature of the test chamber should be 20℃±2℃, the relative humidity should be greater than 50%, and the temperature of the curing room should be 20℃±2℃.
The temperature should be 20℃±1℃, the relative humidity of the curing room should not be lower than 90%, and the temperature of the curing water should be 20℃±1℃.
6.1.2 The temperature of the test chamber during forming of the low-temperature sleeve grouting specimen should be -5℃±2℃, and the temperature of the curing chamber should be -5℃±1℃.
6.2 Liquidity
The fluidity test of normal temperature type sleeve grouting material shall be carried out under standard conditions according to Appendix A; the fluidity test of low temperature type sleeve grouting material shall be carried out separately
Carry out in accordance with Appendix A under the conditions of -5℃±2℃ and 8℃±2℃.
6.3 Compressive strength
See Appendix B for compressive strength test.
6.4 Vertical expansion rate
See Appendix C for the vertical expansion rate test.
6.5 Self-drying shrinkage
See Appendix D for the self-drying shrinkage test.
6.6 Chloride ion content
The chloride ion content test shall be carried out according to GB/T 8077.
6.7 bleeding rate
The bleeding rate test should be performed in accordance with GB/T 50080.
7 Inspection rules
7.1 Factory inspection
The product shall be inspected before leaving the factory. The inspection items shall include initial fluidity, 30min fluidity, compressive strength, vertical expansion rate, vertical expansion rate difference, and bleeding rate.
7.2 Type inspection
Type inspection items should include all the inspection items specified in Table 1 and Table 2.Type inspection shall be carried out in one of the following situations.
a) Type identification of new products;
b) If there are major changes in materials and processes after formal production, the product quality may be affected;
c) When production resumes after stopping production for more than half a year;
d) When the type inspection exceeds one year.
7.3 Group batch rules
7.3.1 Products with the same formula and same batch number of raw materials produced within 15 days should use 50t as a production batch number, and less than 50t should also be used as a batch number.
One production batch number.
7.3.2 The sampling method should be carried out in accordance with the relevant regulations of GB 12573.
7.3.3 The sampling should be representative, and the same amount of samples can be taken from multiple positions, and the total amount of samples should not be less than 30kg.
7.4 Judgment rules
If one of the indicators in the factory inspection and type inspection does not meet the requirements, re-sampling should be taken from the same batch of products, and all items should be reviewed.
Test. The retest is judged as qualified product; the retest is unqualified as unqualified product.
8 Delivery and acceptance
8.1 The manufacturer shall provide the product qualification certificate, instruction manual and product quality inspection report upon delivery.
8.2 The quality acceptance of the product at the time of delivery can take a physical sample, based on its inspection result; it can also be an inspection report with the same batch number of the product
As the basis. The method of quality acceptance shall be negotiated by the buyer and the seller and shall be indicated in the contract or agreement.
8.3 When the inspection results of taking physical samples are used as the basis for acceptance, the buyer and seller shall jointly take samples and seal them before shipment or at the place of delivery. sampling
The method shall be carried out in accordance with GB 12573, and the sample shall be divided into two equal parts. One by the seller in dry and sealed storage for 40 days, and one by the buyer in accordance with this standard
The specified items and methods are tested. Within 40 days, if the buyer considers that the quality does not meet the requirements of this standard, and the seller has objections, the double
The party shall send another sample kept by the seller for inspection.
8.4 When the inspection report of the same batch of products is used as the basis for acceptance, the buyer and seller shall take samples from the same batch of products before or at the time of delivery.
After the two parties jointly sign the seal, it will be stored for 2 months. Within 2 months, if the buyer has any doubts about the quality of the product, the buyer and the seller shall submit the sealed sample for inspection.
9 Marking, packaging, transportation and storage
9.1 Logo
The packaging bag (tube) should be marked with the product name, model, net quality, points of use, manufacturer (including unit address, telephone),
Production batch number, production date, shelf life, etc.
9.2 Packaging
9.2.1 The sleeve grouting material should be packed in moisture-proof bags (tubes).
9.2.2 The net weight of each bag (tube) should be 25kg, and should not be less than 99% of the marked quality.
9.2.3 Randomly sample 40 bags (tubes) of 25kg packaged products, and the total net mass should not be less than 1000kg.
9.3 Transportation and storage
9.3.1 The product should not be damp or mixed with debris during transportation and storage.
9.3.2 The product should be stored in a ventilated, dry and cool place, and care should be taken to avoid long-term sunlight exposure during transportation.
Appendix A
(Normative appendix)
Liquidity test
A.1 The fluidity test shall meet the following requirements.
a) The cement-based grouting material should be mixed with a mixer that meets the requirements of JC/T 681;
b) The truncated cone round mold should meet the requirements of GB/T 2419, and the size is the inner diameter of the lower mouth 100mm±0.5mm, the inner diameter of the upper mouth 70mm±0.5mm, and the height
60mm±0.5mm;
c) The size of the glass plate is 500mm×500mm, and it should be placed horizontally;
d) Measure with a steel ruler with an accuracy of 1mm.
A.2 The fluidity test should be carried out according to the following steps.
a) Weigh 1800g cement-based grouting material, accurate to 5g; according to the product design (instructions) required by the water weighing and mixing
Water, accurate to 1g;
b) Moisten the stirring pot and stirring blades, but there must be no clear water. Pour the cement-based grouting material into the mixing pot, turn on the mixer, and add
The mixing water should be added within 10s;
c) Mix for 240s according to the setting procedure of the cement mortar mixer;
d) Wet the glass plate and the inner wall of the truncated cone mold, but there must be no clear water; place the truncated cone mold in the middle of the glass plate;
e) Pour the cement-based grouting material slurry into the truncated cone mold until the slurry and the upper mouth of the truncated cone mold are level; slowly lift the truncated cone mold to let
The slurry flows freely under no disturbance conditions until it stops;
f) Measure the maximum diffusion diameter of the slurry and the diameter perpendicular to it, and calculate the average value, accurate to 1mm, as the initial value of fluidity;
The above-mentioned stirring and measuring process should be completed within 6 minutes;
g) Put the slurry on the glass plate into the stirring pot, and take measures to prevent the slurry from evaporating. When 30min after adding water and mixing,
Test the slurry in the stirring pot according to the steps c) to f) of this article, and the measurement result is regarded as the 30min retention value of fluidity.
Appendix B
(Normative appendix)
Compressive strength test
B.1 The compressive strength test shall meet the following requirements.
a) The compressive strength test specimen should be a prism with a size of 40mm×40mm×160mm;
b) The compressive strength test should be carried out in accordance with the relevant regulations in GB/T 17671.
B.2 The compressive strength test should be carried out according to the following steps.
a) Weigh 1800g cement-based grouting material, accurate to 5g; weigh the mixing water according to the water consumption required by the product design (instructions),
Accurate to 1g;
b) Mix cement-based grouting materials in accordance with the relevant regulations in Appendix A;
c) Pour the slurry into the test mold until the slurry is flush with the upper edge of the test mold. Do not shake the test mold during the molding process. Stirring should be completed within 6min
During the mixing and forming process, cover immediately after pouring;
d) Put the test mold with slurry in the molding room for 2 hours and then move it into the curing box;
e) The compressive strength test should be carried out in accordance with the relevant regulations in GB/T 17671.
Appendix C
(Normative appendix)
Vertical expansion rate test
C.1 Test method for vertical expansion rate
The vertical expansion rate test method includes the vertical expansion rate contact measurement method and the vertical expansion rate non-contact measurement method.
C.2 Basic requirements of contact measurement method for vertical expansion rate
C.2.1 Test instruments and tools shall meet the following requirements.
a) Dial indicator. measuring range 10mm;
b) Dial indicator holder. magnetic indicator holder;
c) Glass plate. length 140mm×width 80mm×thickness 5mm;
d) Trial mold. The assembling seam of the 100mm×100mm×100mm cube trial mold should be filled with butter and no water leakage;
e) Shovel spoon. width 60mm, length 160mm;
f) Tamping board. it can be replaced by a steel saw blade;
g) Steel backing plate. ordinary steel plate with length 250mm×width 250mm×thickness 15mm.
C.2.2 The instrument installation should meet the following requirements.
a) Steel backing plate. The surface is flat, placed on the workbench horizontally, and the levelness should not exceed 0.02;
b) Trial mold. placed on the steel backing plate, can not be shaken;
c) Glass plate. Place it flat in the middle of the trial mold. Leave a 10mm gap between the left and right sides and the inner side of the test mold;
e) The dial indicator frame is fixed on the steel backing plate, as close as possible to the test mold, and shorten the cantilever length of the cross bar;
d) Dial indicator. The chuck of the dial indicator and the dial indicator holder is firmly fixed, but the indicator rod can rise and fall freely. When installing the dial gauge, press down the gauge head,
Make the needle point to about 1/2 of the range. The dial indicator cannot be tilted back and forth.
C.3 The following test procedures for the contact measurement method of vertical expansion rate
The test procedure of the vertical expansion rate shall meet the following requirements.
a) Mix cement-based grouting materials according to the relevant regulations in Appendix A;
b) Place the glass plate flat in the middle of the trial mold, and lightly press the glass plate. The mixture is poured into the test mold from one side at a time to the other side
Overflow and about 2mm above the edge of the trial mold;
c) Cover the slurry on both sides of the glass plate with wet cotton silk;
d) Place the measuring head of the dial indicator vertically in the center of the glass plate and install it firmly. Read the initial reading h0 of the dial indicator within 30s; formed
The process should be completed within 5 minutes after the end of the stirring;
e) Read the reading ht of the dial gauge at 3h±5min and 24h±15min from the time of adding water and mixing. Cotton should be kept during the whole measurement
The silk is moist and the device must not be subjected to vibration. The molding curing temperature is 20℃±2℃.
C.4 Calculation formula for contact measurement method of vertical expansion rate
The contact measurement method of the vertical expansion rate of sleeve grouting material should be calculated as follows.
C.5 Scope of application of non-contact measurement method for vertical expansion rate
This method is suitable for testing the vertical expansion rate of normal temperature sleeve grouting material.
C.6 Basic requirements for non-contact measurement of vertical expansion rate
The testing instruments and tools used for the non-contact measurement of the vertical expansion rate shall meet the following requirements.
a) For the laser emission system and data acquisition system, the test accuracy should not be less than 10-3, and the range should not be less than 4mm;
b) Trial model. 100mm cube concrete test model should be used, and the joints should be tight and no water leakage.
C.7 Test procedure for non-contact measurement of vertical expansion rate
The test procedure for the non-contact measurement method to determine the vertical expansion rate shall meet the following requirements.
a) The test should be carried out under constant temperature conditions of 20℃±2℃;
b) Before pouring, draw a reference line 98mm from the bottom of the trial mold, and then pour the mixed grout according to Appendix A to the mark at one time
Place a laser reflection sheet in the middle of the surface of the slurry, and then cover the surface of the slurry with a layer of plastic wrap and stick to the surface of the slurry.
surface;
c) Place the test model directly under the laser measuring probe and operate according to the requirements of the instrument;
d) Complete the operation within 5 minutes after mixing, and start measuring, and record the readings of 3h and 24h; when there are special requirements, it should be as required
Read readings between;
e) Do not vibrate, touch or move the test piece and testing instrument during the measurement.
C.8 Calculation formula for non-contact measurement method of vertical expansion rate
The non-contact measurement method of vertical expansion rate shall be calculated according to formula (1).
C.9 Judging method for measuring data of vertical expansion rate of normal temperature sleeve grouting material
In case of inconsistency between the contact measurement method and the non-contact measurement method in the vertical expansion rate test of normal temperature sleeve grouting material, arbitration inspection
The non-contact measurement method shall prevail.
Appendix D
(Normative appendix)
Self-drying shrinkage test
D.1 This method is suitable for determining the self-drying shrinkage value of sleeve grouting material.
D.2 The following instruments should be used for the self-drying shrinkage test.
a) The measuring accuracy of the length gauge is 10-3mm;
b) Shrink head. should be processed from brass or stainless steel;
c) Trial mold. 40mm×40mm×160mm prism should be used, and a 6.5mm should be opened at the center of the two end faces of the trial mold
Holes.
Figure D.2 Shrink head
D.3 The self-drying shrinkage test should be carried out according to the following steps.
a) The shrink head should be fixed in the holes at both ends of the test mold. The length of the shrink head buried in the slurry should be 10 mm ± 1 mm, and the end should be exposed.
The end face of the piece is 8 mm±1mm;
b) The mixed slurry should be poured directly into the trial mold, and the slurry should be flush with the upper edge of the trial mold. Cover immediately after pouring. Start with mixing
Timing to the end of molding should be completed within 6 minutes, and then the belt mold is placed under standard curing conditions (temperature 20 ℃ ± 2 ℃, relative humidity
Equal to 90%) after curing for 20h±0.5h, the mold can be removed. After the mold is removed, the test block is completely wrapped with no less than two layers of plastic film, and then used
Aluminum foil paste wraps the test block with plastic film, number it and indicate the test direction;
c) Move the test block into the laboratory at a temperature of 20 ℃ ± 2 ℃ for 4 hours, and immediately measure the initial length of the test piece according to the indicated test direction.
Before measuring, adjust the origin of the length gauge with a standard rod;
d) After measuring the initial length, place the test piece in a laboratory at a temperature of 20℃±2℃ and a relative humidity of (60±5)%, and then
28d Determine the length of the test piece.
D.4 The self-drying shrinkage value should be calculated as follows.
D.5 The test result of self-drying shrinkage value shall be determined according to the following requirements.
a) The arithmetic average of the measured values of the three test pieces shall be taken as the self-drying shrinkage value, and the calculation shall be accurate to 10-6;
b) When a value deviates from the average value by more than 20%, it should be eliminated;
c) When the deviation of two values from the average value is greater than 20%, the result of this group of test pieces is invalid.
Related standard: JGJ/T 408-2017    JGJ/T 400-2017
Related PDF sample: JGJ 107-2016    JG/T 163-2013