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GB/T 19496-2026Test method for the compressive strength of spun high-strength concrete by core drilling (English PDF)

钻芯检测离心高强混凝土抗压强度试验方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

May 25, 2026

Implementation date

December 1, 2026

Scope

GB/T 19496-2026 is the English-translated version of 钻芯检测离心高强混凝土抗压强度试验方法.

GB/T 19496-2026 is the Chinese national standard covering coring a spun concrete pole or pile to measure its strength - a curved, thin, centrifugally compacted wall, which is why the coring, the specimen preparation and the correction factors cannot simply be borrowed from ordinary concrete. It replaces GB/T 19496-2004 and takes effect on 1 December 2026. It was issued on 25 May 2026 and takes effect on 1 December 2026, replacing GB/T 19496-2004. The document is under the responsibility of the China Building Materials Federation. This page is published from the official record of the 2026 edition; the clause text of a standard this recent is not yet in circulation, and the figures, limits and tables it contains are those of the document itself, delivered in full with the English translation.

Document preview — GB/T 19496-2026

National Standard of the People's Republic of China

ICS: 91.100.30
Classification: Q 14
Replacing: GB/T 19496-2004

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

4 Test conditions
5 Instruments and Equipment
5.1 Measuring instruments
5.3 Core Drilling Machine
5.4 Core Sample Sawing Machine
5.5 Core Sample Grinding Machine
5.6 Core Sample Sawing and Grinding Integrated Machine
5.7 Pressure Testing Machine
6 Preparation of core specimens
6.1 Core Sample Drilling
6.1.10 If the core sample obtained by drilling does not meet the requirements of
6.2 Core Sample Sawing
6.3 Grinding the core sample flat
7 Compressive strength test
8 Experimental Data Processing
9 Test Report

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part

1.Structure and Drafting Rules of Standardization Documents". Drafting. This document replaces GB/T 19496-2004 "Test Method for Compressive Strength of Centrifuged High-Strength Concrete by Core Drilling", and is consistent with GB/T 19496- Compared to.2004, aside from structural adjustments and editorial changes, the main technical changes are as follows:

a) The term "inner core sample" (see

3.7 in the.2004 edition) was deleted, the term "core sample specimen" was added (see 3.3), and "centrifugal height" was changed. "High-strength concrete", "core sample", "core sample flatness", "core sample parallelism", "core sample perpendicularity", "core sample cylindricity" Terms and definitions for "estimated compressive strength of concrete in core specimens" (see 3.1, 3.2, 3.4~3.8, 3.1~

3.6 in the.2004 edition). 3.8);

b) A new chapter on "Experimental Conditions" has been added (see Chapter 4);

c) The requirements for instruments and equipment have been changed (see Chapter 5, Chapter 4 of the.2004 edition);

d) The requirements for core sampling have been changed (see 6.1, Chapter 5 of the.2004 edition);

e) The requirements for core sample sawing and core sample grinding have been changed (see 6.2, 6.3, and 6.4~

6.6 in the.2004 edition);

f) The measurement requirements for the geometric dimensions and form and position tolerances of the core specimens have been changed (see 6.4,

6.8 in the.2004 edition);

g) The compressive strength test procedure has been changed (see Chapter 7, Chapter 7 of the.2004 edition);

h) The method of processing experimental data has been changed (see Chapter 8, Chapter 8 of the.2004 edition). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Building Materials Federation. This document is under the jurisdiction of the National Technical Committee on Standardization of Cement Products (SAC/TC197). This document was drafted by: Suzhou Concrete and Cement Products Research Institute Co., Ltd., Jiaxing University, and Guangdong Wengu Testing and Appraisal Co., Ltd. Suzhou Concrete and Cement Products Research Institute Testing Center Co., Ltd., Guangdong Youpeng Building Materials Co., Ltd., and Guangxi Wankai New Material Technology Co., Ltd. Company, Ningbo Zhongchun High-Tech Co., Ltd., Guangdong Sanhe Pipe Pile Co., Ltd., Zhejiang Zhengda Pipe Pile Co., Ltd., Zhejiang Zhenghao Engineering Research Research Institute Co., Ltd., Anhui Jinmeiya New Building Materials Group Co., Ltd., Shanghai Jianke Inspection Co., Ltd., Zhejiang Yili Pipe Industry Technology Co., Ltd. Guangdong Hongye Building Materials Technology Co., Ltd., Tianjin Tianzhuang Building Materials Technology Co., Ltd., Jiangsu Anfang Electric Power Technology Co., Ltd., Guangdong Quanke Engineering Testing Co., Ltd., Xinjiang Road & Bridge North Xinjiang Engineering Construction Co., Ltd., China Railway Construction Port & Navigation Bureau Group Co., Ltd., Quanzhou Municipal Construction Engineering Quality Safety Station, Jiaxing Municipal Water Conservancy Engineering Construction Co., Ltd., Tianjin Survey and Design Institute Group Co., Ltd., Shanghai Port Engineering Quality Inspection Limited Liability Company, Suzhou Hengxin Construction Technology Development and Testing Co., Ltd., China Railway 19th Bureau Group Co., Ltd., Zhejiang Chenxin Machinery Equipment Co., Ltd. Company, Baisheng United Group Co., Ltd., China Railway 24th Bureau Group Co., Ltd., Jiashan County Product Quality Supervision and Inspection Institute, Guangxi Nonferrous Exploration and Design Institute Design Institute Co., Ltd., Xinjiang Qiankun Engineering Construction Group Co., Ltd., Shanghai Qianweijia Construction Technology Co., Ltd., Shandong Linmin Company Road Materials Co., Ltd., Shanghai Tongfeng Engineering Consulting Co., Ltd., Zhongyuan Construction Group Co., Ltd., Shandong Qisheng New Materials Co., Ltd. Company. Zhejiang Zhongcheng Cement Pipe Pile Co., Ltd. The main drafters of this document are. Tian Yin, Jiang Yuanhai, Luo Jingjing, Yu Feng, Xu Xiaodong, Li Mingliang, Xiang Anle, Yan Tianlong, Teng Yaohua, and Zhou Zhuoping. Gao Haorong, Huang Qinghui, Zhang Yuyang, Qi Jinliang, Zhou Yiyu, Wang Jun, Ye Fei, Chen Xiaoliang, Shi Fudi, Yang Junyi, Xiong Houren, Lin Changhua, Feng Xingzhuo Xi Jianjun, Guo Jing, Weng Dunxian, Lu Song, Liu Yongxiang, Duan Jun, Yang Jinrui, Wu Yuhao, Sun Yangbo, Xing Kaijian, Yin Cheng, Xu Hong, Fu Qiang, Li Qiong Li Huiying, Gong Xiaofei, Peng Lidan, Huang Dianwu, Liu Hongfei, Lin Hai, Ruan Shenglin, Zhang Yongxiao, Huang Wei, Lü Xiangyang, Tang Xing, Qiao Hengxuan, Yan Zhaozhen Yuan Gaoshun, Tie Dong, Yang Baohua, Qiu Liang, Li Feifei, Wang Zhongliang, Zhu Jieqi. This document was first published in.2004, and this is its first revision. Core drilling to test the compressive strength of centrifuged high-strength concrete Test methods

4 Test conditions

4.1 Rebar detectors, core drills, core sample saws, core sample grinders, integrated core sample sawing and grinding machines, and pressure testing machines should all have product certifications. Certificate.

4.2 Operators should be familiar with the instruments and equipment and safe operating procedures, and should only perform core sample drilling, core sample sawing, core sample grinding, and core sample pressure testing after training. Operations such as temperature testing.

4.3 The relative humidity of the laboratory environment should not be less than 50%, and the temperature should be maintained at 20°C±5°C.

4.4 Before the compressive strength test, the core specimen should be left to stand in the test chamber for no less than 48 hours.

5.1 Measuring instruments

5.1.1 Measuring instruments shall have verification or calibration certificates and be within their validity period.

5.1.2 Knife-edge rulers shall conform to the requirements of GB/T 6091.

5.1.3 Vernier universal angle gauges shall conform to the provisions of GB/T 6315.

5.1.4 Metal rulers shall conform to the provisions of GB/T 9056.

5.1.5 Calipers shall conform to the provisions of GB/T 21389.

5.1.6 Height calipers shall conform to the requirements of GB/T 21390.

5.1.7 Feeler gauges shall conform to the requirements of GB/T 22523.

5.2 Rebar Detector The maximum detection depth should be no less than 60 mm, and the detection position deviation should preferably be no greater than ±2 mm.

5.3 Core Drilling Machine

5.3.1 It should have sufficient rigidity, be flexible in operation, easy to fix and move, and should have a water cooling system.

5.3.2 The power should be no less than 3kW and the speed should be no less than 700r/min.

5.3.3 The radial runout deviation of the spindle should be less than

0.05 mm, and the axial runout deviation should be less than

0.1 mm.

5.3.4 The drill bit should preferably be a thin-walled cylindrical drill bit made of diamond or synthetic diamond as specified in JC/T 816, with an inner diameter of 70mm~100mm. There are no visible cracks, missing edges, missing corners, tilting, or flared mouth deformation.

5.3.5 The coaxiality deviation between the drill bit and the drill shaft of the drilling rig should not exceed

0.3 mm, and the radial runout deviation of the drill bit should not exceed

5.3.6 Other requirements for core drilling machines shall comply with the provisions of GB/T 3883.306.

5.4 Core Sample Sawing Machine

5.4.1 A water cooling system and a device for clamping the core sample should be provided.

5.4.2 There should be a control device for parameters such as the rotation speed of the circular saw blade and the sawing feed stroke speed.

5.4.3 It is advisable to have a double-blade automatic sawing mechanism.

5.4.4 The rigidity of the circular saw blade used in conjunction with the equipment shall comply with the requirements of JC/T 340.

5.5 Core Sample Grinding Machine

5.5.1 A water cooling system and a device for clamping the core sample shall be provided.

5.5.2 There should be a control device for parameters such as the grinding propulsion stroke speed and the grinding feed rate.

5.5.3 It is advisable to have a double-sided automatic grinding control device.

5.5.4 The processing performance of the grinding machine should meet the requirement that the flatness of the processed core sample specimen is no more than

0.06 mm.

5.6 Core Sample Sawing and Grinding Integrated Machine

5.6.1 A water cooling system and a device for clamping the core sample should be provided.

5.6.2 There should be a control device for automatic double-blade sawing and automatic double-sided grinding.

5.6.3 The rigidity of the circular saw blade used in conjunction with the equipment shall comply with the requirements of JC/T 340.

5.6.4 There should be a control device for parameters such as the grinding propulsion stroke speed and the grinding feed rate.

5.6.5 The processing performance of the core sample sawing and grinding integrated machine should meet the requirement that the flatness of the processed core sample specimen is no more than 0.06mm.

5.7 Pressure Testing Machine

5.7.1 A testing machine conforming to or higher than level 1 of GB/T 3159-2026 or GB/T 16826-2023 shall be used.

5.7.2 The failure load of the core sample should be greater than 20% and less than 80% of the full range of the press.

6.1 Core Sample Drilling

6.1.1 Before core sampling, a rebar detector should be used to determine the location of the rebar.

6.1.2 Requirements for the location of core samples drilled from the workpiece.

a) Drilling should not be performed on damaged or completed products;

b) Core samples should be drilled in the middle of the product, at a location convenient for the installation and operation of the core drilling machine, and at a distance of not less than 2.0m from both ends of the product. The sampling interval should be 0.3m to 1m;

c) The joints of the steel molds should be avoided;

d) When drilling multiple core samples from a single product, the core samples should preferably be taken from different parts.

6.1.3 The diameter of the core sample taken should be 70mm~100mm, and preferably not less than 3 times the maximum particle size of the aggregate. The core sample diameter should be proportional to the wall thickness of the product. Correspondingly, and should comply with the provisions of Table 1.

6.1.4 There should be no fewer than 5 valid core samples drilled from the same product.

6.1.5 Before core sampling, it is advisable to fix the core sample to the product using steel clamps. The core drilling machine is mounted on the steel clamps, as shown in Figure

1.When the core drilling machine is working... There should be no positional shift or jumping; the spindle of the core drill should be perpendicular to the tangent of the outer surface of the product from which the core sample is being drilled.

6.1.6 The pressure of the cooling water used to cool the drill bit and remove concrete debris during core drilling should not be less than

0.1 MPa, and the flow rate should preferably not be less than 3L/min.

6.1.7 The drilling speed should be uniform, and the speed of the advance stroke should not exceed 5 mm/min.

6.1.8 After the core sample taken from the borehole is dried, it should be marked in a timely manner, and the product number, drilling location and direction, and sampling date should be recorded.

6.1.10 If the core sample obtained by drilling does not meet the requirements of

6.4.2 after sawing and grinding, a new core sample should be drilled.

6.2 Core Sample Sawing

6.2.1 Before sawing the core sample, use a metal ruler to measure the cross-sectional position of the core sample to be sawed, and use a colored pen to mark the area to be sawed around the perimeter.

6.2.2 A single core specimen shall contain a maximum of two reinforcing bars, of which no more than one shall be prestressed. The reinforcing bars shall be perpendicular to the core specimen axis and spaced at a distance from the core specimen. More than 10mm from the end face.

6.2.3 When processing with a sawing machine, the core sample should be fixed and the sawing plane should be perpendicular to the axis of the core sample.

6.2.4 The laitance, cement paste and mortar layer on the inside of the core sample should be sawed off, and the outside of the core sample should not be processed by sawing.

6.2.5 When sawing, measures such as controlling the sawing speed and using tape to clamp the outer surface of the core sample should be taken to prevent the concrete of the core sample from cracking.

6.2.6 Water cooling should be used for the circular saw blade and core sample during the sawing process. The pressure of the cooling water should not be less than

0.1 MPa, and the flow rate should not be less than [missing value]. 3L/min.

6.3 Grinding the core sample flat

6.3.1 After the core sample is sawn, it is advisable to use a grinding machine to grind the two ends of the core sample flat.

6.3.2 During the grinding process, the end face of the core sample should be perpendicular to the axis.

6.3.3 When grinding with a grinding machine, the rotation speed of the grinding disc should not be less than 1500 r/min, and the grinding feed rate should not exceed

0.05 mm/pass. For each core sample... The grinding time should be no less than 2 minutes.

6.3.4 During the grinding process, water cooling should be used for the grinding disc and core sample. The pressure of the cooling water should not be less than

0.1 MPa, and the flow rate should not be less than [missing value]. 3L/min.

6.4 Measurement of geometric dimensions and form and position tolerances of core specimens

6.4.1 The geometric dimensions and form and position tolerances of the core sample specimen shall be measured according to the following requirements.

a) Average diameter of the core sample. Measured at three points evenly distributed along the height of the core sample using calipers, with two measurements perpendicular to each other at each point. The diameter was calculated as the arithmetic mean of six measurements, rounded to

0.1 mm.

b) Core specimen height. Using height calipers, measure the height at the intersection of any two mutually perpendicular diameters on the end face of the core specimen and the edge of the core specimen. The height was measured at each location, and the arithmetic mean of the four measurements was taken and rounded to

0.1 mm.

c) Flatness of the core sample. Place a knife-edge ruler on the end face of the core sample, rotate it 360°, and use a feeler gauge to measure the flatness of the two end faces respectively. The maximum gap is accurate to 0.01mm;

d) Parallelism of core specimens. Measure the maximum and minimum height of the core specimens using height calipers, calculate the difference, and round it to

7 Compressive strength test

7.1 Randomly select 3 core specimens and conduct the compressive strength test according to the provisions of GB/T 50081 for the compressive strength test of cubic specimens.

7.2 During loading, the loading rate should be controlled at

0.8 MPa/s to

1.0 MPa/s, and the loading should be continuous and uniform within the specified range until the core sample specimen is fully loaded. destroy.

7.3 Inspect the condition of the core sample after breakage. If it contains coarse aggregate larger than 1/2 the diameter of the core sample, the core sample should be discarded. Based on the test results of the specimens, core specimens were extracted from the remaining core specimens for compressive strength testing.

8 Experimental Data Processing

8.1 The estimated compressive strength of the concrete core specimens is calculated using the following formula, and the result is rounded to

0.1 MPa.

8.2 The arithmetic mean of the estimated compressive strength of concrete from three core specimens shall be taken as the strength value of the group of specimens, and shall be rounded to

0.1 MPa; When the difference between the maximum or minimum value of the three estimated concrete compressive strength values and the median value exceeds 15% of the median value, then The maximum and minimum values should be discarded, and the median value should be taken as the strength value of the specimen group; when the difference between the maximum and minimum values and the median value both exceed [a certain threshold], [further action is needed]. If the median value is 15%, the test results for that group of specimens are invalid and the test should be repeated.

8.3 The estimated compressive strength of centrifuged high-strength concrete products is given in Appendix A.

9 Test Report

The test report should include at least the contents of Table

2.The format of the test report can be found in Table 2.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Editions of GB/T 19496

Edition	Title	Revision	Status
GB/T 19496-2026	Test method for the compressive strength of spun high-strength concrete by core drilling	current edition	Current
GB/T 19496-2004	Test method for the compressive strength of spun high-strength concrete by core drilling	previous edition	In force until 1 December 2026

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