GB/T 50080-2016 English PDFUS$1289.00 · In stock
Delivery: <= 9 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 50080-2016: Standard for test method of performance on ordinary fresh concrete Status: Valid GB/T 50080: Historical versions
Basic dataStandard ID: GB/T 50080-2016 (GB/T50080-2016)Description (Translated English): Standard for test method of performance on ordinary fresh concrete Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: Q13 Word Count Estimation: 99,965 Date of Issue: 2016-08-18 Date of Implementation: 2017-04-01 Older Standard (superseded by this standard): GB/T 50080-2002 Quoted Standard: GB/T 6003.2; JGJ 52; JG 244; JG/T 245; JG/T 246; JG/T 248; JG/T 250; JG/T 329; JC/T 958 Regulation (derived from): Ministry of Housing and Urban - Rural Development Notice No. 1249 of 2016 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 standard applies to the performance of ordinary concrete mixes. GB/T 50080-2016: Standard for test method of performance on ordinary fresh concrete---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 This standard is formulated to standardize and unify the performance test methods of ordinary concrete mixtures, improve the test technology level, ensure the performance of concrete mixtures, and meet the quality requirements of precast concrete components and cast-in-place concrete projects. 1.0.2 This standard is applicable to the performance test of ordinary concrete mixture. 1.0.3 The performance test of ordinary concrete mixture shall not only comply with the provisions of this standard, but also meet the provisions of the current relevant national standards. 2 Terms and symbols 2.1 Terminology 2.1.1 Ordinary concrete Concrete with a dry apparent density of.2000kg/m3 to 2800kg/m3. 2.1.2 Slump slump The height at which a concrete mixture slumps under its own weight. 2.1.3 Extended slump-flow The diameter by which a concrete mixture expands after slumping. 2.1.4 Gap passing ability The performance of the concrete mixture passing through the gap evenly. 2.1.5 J-Ring J-Ring A circular instrument for determining the passability of concrete mixtures. 2.1.6 Self-compacting concrete self-compacting concrete Concrete with high fluidity, uniformity and stability, without external vibration during pouring, can flow under its own weight and fill the formwork space. 2.1.7 Extended time slump-flow time The time required for a concrete mixture to expand to a diameter of 500mm after slumping. 2.1.8 bleeding The phenomenon of precipitation of moisture in the concrete mixture. 2.1.9 pressure bleeding Bleeding phenomenon of concrete mixture under pressure. 2.1.10 Consistency The index characterizing the fluidity of concrete mixture can be expressed by slump, Weibo consistency or expansion degree. 2.1.11 Anti-segregation resistance The various components in the concrete mixture maintain the performance of uniform dispersion. 2.1.12 adiabatic temperature rise Concrete in an adiabatic state, the temperature rise caused by the hydration of the cementitious material. 2.2 Symbols 2.2.1 Slump H0——the initial slump value of the concrete mixture when it leaves the machine; H60——The slump value of the concrete mixture after standing for 60 minutes. 2.2.2 Expansion L0——the initial expansion value of the concrete mixture when it leaves the machine; L60——The expansion value of the concrete mixture after standing for 60 minutes. 2.2.3 Empty time tsf, m—the average value of the emptying time of the concrete mixture in the inverted slump cylinder measured by two tests; tsf1, tsf2—the emptying time of the concrete mixture in the inverted slump cylinder measured in two tests respectively. 2.2.4 Bleeding volume Ba——the bleeding amount of concrete mixture per unit area; V10—the bleeding volume when pressurized to 10s; V140——the bleeding volume when pressurized to 140s. 2.2.5 Bleeding rate B——bleeding rate; BV - pressure bleeding rate. 2.2.6 Gas content A - the air content of the concrete mixture; A0 - the air content of the uncorrected concrete mixture; Ag—the air content of the aggregate. 2.2.7 Density ρ—the apparent density of the concrete mixture; ρw——the density of water; ρm—the apparent density of the concrete mortar mixture; ρmax——the maximum value of the apparent density of the concrete mortar mixture sampled successively; △ρm—the difference in apparent density of the concrete mortar mixture that has been sampled successively. 2.2.8 Others DRρ—concrete mortar density deviation rate; SR - segregation rate of concrete mixture; fPR—penetration resistance per unit area; α - correction coefficient of adiabatic temperature rise of test equipment; θn——the adiabatic temperature rise value of n-day-old concrete; θ'n—the temperature rise value recorded by the instrument at the age of n days; θ0 - the initial temperature of the concrete mixture. 3 Basic Regulations3.1 General provisions 3.1.1 The maximum nominal particle size of the aggregate shall comply with the provisions of JGJ 52, the current industry standard "Sand and Stone Quality and Inspection Method Standard for Ordinary Concrete". 3.1.2 The relative humidity of the test environment should not be less than 50%, and the temperature should be kept at 20°C ± 5°C; the temperature of the materials, test equipment, containers and auxiliary equipment used should be consistent with the temperature of the laboratory. 3.1.3 During the on-site test, the concrete mixture sample should be prevented from being affected by wind, rain, snow and direct sunlight. 3.1.4 When making samples for performance tests of concrete mixtures, the mixers used shall comply with the provisions of the current industry standard "Mixers for Concrete Tests" JG 244. 3.1.5 The test equipment should be calibrated before use. 3.2 Sampling and sample preparation 3.2.1 For the sampling of the same group of concrete mixtures, the samples shall be taken in the same tray of concrete or the same truck of concrete. The sampling volume should be 1.5 times more than the amount required for the test, and should not be less than 20L. 3.2.2 The sampling of concrete mixture should be representative, and the method of multiple sampling should be adopted. It is advisable to take samples at 1/4, 1/2 and 3/4 of the same tray of concrete or concrete in the same truck, and stir them evenly; the time interval between the first sampling and the last sampling should not exceed 15 minutes. 3.2.3 It is advisable to start various performance tests within 5 minutes after sampling. 3.2.4 The mixing of the concrete mixture prepared in the laboratory shall meet the following requirements. 1 The concrete mixture should be stirred by a mixer. Before mixing, the mixer should be rinsed clean, and a small amount of the same concrete mixture or mortar with the same water-binder ratio is pre-mixed. After the inner wall of the mixer is grouted, the remaining material is discharged; 2 The weighed coarse aggregate, cementitious material, fine aggregate and water should be added to the mixer in sequence. Insoluble and insoluble powdered admixtures should be added to the mixer at the same time as the cementitious material, and liquid and soluble admixtures should be mixed with Water is added to the mixer at the same time; 3 The concrete mixture should be stirred for more than 2 minutes until it is evenly stirred; 4 The mixing volume of concrete mixture at one time should not be less than 1/4 of the nominal capacity of the mixer, should not be greater than the nominal capacity of the mixer, and should not be less than 20L. 3.2.5 When mixing concrete in the laboratory, the amount of materials should be measured by mass. The weighing accuracy of aggregate should be ±0.5%; the weighing accuracy of cement, admixture, water and admixture should be ±0.2%. 3.2.6 Sampling should record the following content and write it into the test or inspection report. 1 sampling date, time and sampler; 2 Project name, structural parts; 3 Concrete watering time and mixing time; 4 Concrete marking; 5 Sampling method; 6 sample number; 7 the number of samples; 8 Ambient temperature and sampling weather conditions; 9 The temperature of the sampled concrete. 3.2.7 When preparing concrete mixture in the laboratory, in addition to the content specified in Article 3.2.6 of this standard, the following content should be recorded and written into the test or inspection report. 1 Test ambient temperature; 2 Test environment humidity; 3 Varieties, specifications, origins and performance indicators of various raw materials; 4 Concrete mix ratio and material consumption per tray of concrete.4 Slump test and slump loss over time test4.1 Slump test 4.1.1 This test method is suitable for the determination of the slump of concrete mixtures whose maximum nominal aggregate particle size is not greater than 40mm and the slump is not less than 10mm. 4.1.2 The test equipment for slump test shall meet the following requirements. 1 The slump meter shall comply with the provisions of the current industry standard "Concrete Slump Meter" JG/T 248; 2.Two steel rulers shall be equipped, the measuring range of the steel ruler shall not be less than 300mm, and the division value shall not be greater than 1mm; 3 The bottom plate shall adopt steel plates with plane dimensions not less than 1500mm×1500mm and thickness not less than 3mm, and its maximum deflection shall not be greater than 3mm. 4.1.3 The slump test should be carried out according to the following steps. 1 The inner wall and bottom plate of the slump cylinder should be wetted with no clear water; the bottom plate should be placed on a solid horizontal surface, and the slump cylinder should be placed in the center of the bottom plate, and then the pedals on both sides should be stepped on with your feet. It should be kept in a fixed position when loading; 2 Concrete mixture samples should be evenly loaded into the slump cylinder in three layers. For each layer of concrete mixture, the tamping rod should be inserted and tamped 25 times from the edge to the center in a spiral shape. After tamping, each The height of the concrete mixture sample is about one-third of the cylinder height; 3 When inserting and pounding the bottom layer, the tamping rod should penetrate the entire depth; when inserting and tamping the second layer and the top layer, the tamping rod should penetrate the surface of this layer to the next layer; 4 The top layer of concrete mixture should be charged higher than the mouth of the cylinder, and should be added at any time when the concrete mixture is lower than the mouth of the cylinder during the insertion and tamping process; 5 After the top layer is inserted and pounded, remove the charging funnel, scrape off the excess concrete mixture, and smooth it along the mouth of the barrel; 6 After clearing the concrete on the bottom plate of the side of the tube, lift the slump tube vertically and steadily, and place it lightly next to the sample; The height difference between the height and the highest point of the concrete specimen after the slump is taken as the slump value of the concrete mixture. 4.1.4 The lifting process of the slump cylinder should be controlled within 3s to 7s; the whole process from the beginning of charging to the lifting of the slump cylinder should be carried out continuously and should be completed within 150s. 4.1.5 When the concrete collapses on one side or is damaged after the slump cylinder is lifted, it should be re-sampled and measured separately; if the phenomenon of collapse or shearing on one side still occurs in the second test, it should be recorded and explained. 4.1.6 The measurement of slump value of concrete mixture should be accurate to 1mm, and the result should be rounded to 5mm. 4.2 Slump loss over time test 4.2.1 This test method can be used to measure the change of slump of concrete mixture with standing time. 4.2.2 The test equipment for the slump loss over time test shall comply with the provisions of Article 4.1.2 of this standard. 4.2.3 The test of slump loss over time should be carried out according to the following steps. 1 The initial slump value H0 of the concrete mixture should be measured; 2 Put all the concrete mixture samples into a plastic bucket or a metal bucket that is not corroded by cement slurry, and seal it with a bucket cover or a plastic film and let it stand; 3 Start timing from the time of stirring and adding water. After standing still for 60 minutes, pour all the concrete mixture samples in the bucket into the mixer, stir for 20 seconds, and conduct a slump test to obtain the 60-minute slump value H60. 4 Calculate the difference between the initial slump value and the 60-min slump value to obtain the test results of the 60-min concrete slump loss over time. 4.2.4 When the project requires adjustment of the standing time, the concrete slump loss over time should be measured and calculated according to the actual standing time.5 Expansion test and expansion time loss test5.1 Expansion test 5.1.1 This test method is suitable for the determination of the expansion degree of concrete with a maximum nominal particle size of aggregate not greater than 40mm and a slump not less than 160mm. 5.1.2 The test equipment for expansion test shall meet the following requirements. 1 The slump meter shall comply with the provisions of the current industry standard "Concrete Slump Meter" JG/T 248; 2 The measuring range of the steel ruler should not be less than 1000mm, and the division value should not be greater than 1mm; 3 The bottom plate shall adopt steel plates with plane dimensions not less than 1500mm×1500mm and thickness not less than 3mm, and its maximum deflection shall not be greater than 3mm. 5.1.3 The expansion test should be carried out according to the following steps. 1 The test equipment preparation, concrete mixture charging and tamping shall comply with the provisions of paragraphs 1 to 5 in Article 4.1.3 of this standard; 2 After clearing the concrete on the bottom plate of the side of the tube, the slump tube should be lifted vertically and smoothly, and the lifting process of the slump tube should be controlled within 3s~7s; when the concrete mixture no longer diffuses or the diffusion duration reaches 50s, the maximum diameter of the expanded surface of the concrete mixture and the diameter perpendicular to the maximum diameter shall be measured with a steel ruler; 3 When the difference between the two diameters is less than 50mm, the arithmetic mean value should be taken as the result of the expansion test; when the difference between the two diameters is not less than 50mm, a new sample should be taken for another measurement. 5.1.4 When it is found that the coarse aggregate is piled up in the center or the slurry is precipitated at the edge, it shall record and explain. 5.1.5 The entire process of the expansion test from the beginning of charging to the measurement of the concrete expansion value should be carried out continuously and should be completed within 4 minutes. 5.1.6 The measurement of the expansion degree of concrete mixture should be accurate to 1mm, and the result should be rounded to 5mm. 5.2 Expansion time loss test 5.2.1 This test method can be used for the determination of the degree of expansion of concrete mixtures as a function of standing time. 5.2.2 The test equipment for the time-lapse loss test of expansion degree shall comply with the provisions in Article 5.1.2 of this standard. 5.2.3 The time-lapse loss test of expansion degree shall be carried out according to the following steps. 1 The initial expansion value L0 of the concrete mixture should be measured when it is out of the machine; 2 Put all the concrete mixture samples into a plastic bucket or a metal bucket that is not corroded by cement slurry, and seal it with a bucket cover or a plastic film and let it stand; 3 Start timing from the time of stirring and adding water. After standing still for 60 minutes, all the concrete mixture samples in the bucket should be poured into the mixer, and stirred for 20 seconds, that is, the expansion test is carried out, and the 60-min expansion value L60 is obtained; 4 Calculate the difference between the initial expansion degree value and the 60min expansion degree value, and the test result of the 60min concrete expansion degree loss over time can be obtained. 5.2.4 When the project requires adjustment of the standing time, the actual standing time shall be used to measure and calculate the loss of concrete expansion over time.6 Weber consistency test6.0.1 This test method is suitable for the determination of the Vib consistency of concrete mixtures whose maximum nominal particle size is not greater than 40mm and the Vib consistency is between 5s and 30s; The consistency of the extra-dry hard concrete mixture with a consistency greater than 30s can be measured by the augmentation factor method in Appendix A of this standard. 6.0.2 The test equipment for Viber consistency test should meet the following requirements. 1 The Weibo Consistency Meter shall comply with the provisions of the current industry standard "Weibo Consistency Meter" JG/T 250; 2 The accuracy of the stopwatch should not be lower than 0.1s. 6.0.3 The test should be carried out according to the following steps. 1 The Viber Consistency Meter should be placed on a solid level surface, and the container, the inner wall of the slump cylinder and other utensils should be moistened with ignorant water. 2.The feeding hopper should be fastened above the slump cylinder. Correct the position of the container so that its center coincides with the feeding center, and then tighten the fixing screws. 3 The concrete mixture sample shall be evenly loaded into the slump cylinder in three layers, and the height of each layer shall be about one-third of the cylinder height after compaction. For each layer installed, the tamping stick should be evenly inserted into the cylinder from the edge to the center for 25 times in a spiral shape; when inserting and tamping the bottom layer, the tamping stick should penetrate the entire depth; when inserting and tamping the second and top layers, the tamping stick should penetrate through The surface of this layer to the next layer; the top layer of concrete should be higher than the mouth of the cylinder, and the concrete should be added at any time when it is lower than the mouth of the cylinder during the insertion and tamping process. 4 After the top layer is inserted and tamped, the feeding hopper should be turned away, the top surface should be scraped along the mouth of the slump cylinder, and the slump cylinder should be lifted vertically, so that the concrete mixture sample should not be twisted laterally. 5.Turn the transparent disk to the top of the concrete cone, loosen the screw of the measuring rod, and the transparent disk should be turned to the upper part of the concrete cone and lowered to contact with the top surface of the concrete. 6 Tighten the set screw, turn on the vibrating table, and use a stopwatch to time the time. When the vibration reaches the point where the entire bottom surface of the transparent disc contacts the cement slurry, stop the timing and turn off the vibrating table. 6.0.4 The time recorded by the stopwatch should be used as the Viber consistency value of the concrete mixture, accurate to 1s.7 Inverted slump cylinder emptying test7.0.1 This test method can be used to determine the emptying time of concrete mixture in an inverted slump cylinder. 7.0.2 The test equipment for the emptying test of the inverted slump cylinder shall meet the following requirements. 1 The material, shape and size of the inverted slump cylinder shall comply with the provisions of the current industry standard "Concrete Slump Tester" JG/T 248, and the small opening shall be provided with a quick-opening sealing cover; 2.The bottom plate shall adopt a steel plate with a plane size not less than 1500mm×1500mm and a thickness not less than 3mm, and its maximum deflection shall not be greater than 3mm; 3 The stand supporting the inverted slump cylinder shall be able to bear concrete filling and tamping. When the inverted slump cylinder is placed on the stand, the distance from the small end of the inverted slump cylinder to the bottom plate shall not be less than 500mm, and the central axis of the slump cylinder shall be vertical on the floor; ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 50080-2016_English be delivered?Answer: Upon your order, we will start to translate GB/T 50080-2016_English as soon as possible, and keep you informed of the progress. The lead time is typically 6 ~ 9 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 50080-2016_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 50080-2016_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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