摘要
按照GB/T 23439-2017《混凝土膨胀剂》附录B试验方法A测定掺膨胀剂混凝土的限制膨胀率及干缩率,和备选方法外径千分尺测定法相比,重复性测定误差率较大。通过三位试验员独立检测,单个试件重复三遍,附录B试验方法A是外径千分尺法平均差值的4.8倍,建议规范附录B试验方法A改用外径千分尺测量或增加外径千分尺法。
In accordance with GB/T 23439-2017 "Expansive agent for concrete", when using Method A of Appendix B to determine the limiting expansion rate and drying shrinkage rate of concrete mixed with expansion agent, it is found that the repeatability measurement error rate is much larger that of "outside micrometer method". Each test piece is repeated three times by three testers independently. The average error of Appendix B Method A is 4.8 times of that of the "outside micrometer method". It is recommended that Appendix B method A should be changed to "outside micrometer method" or the "outside micrometer method" should be added.
作者
李锋
干娜
颜奋勇
LI Feng;GAN Na;YAN Fenyong(Zhoushan Dachang Ready-mixed Concrete Co.,Ltd.,Zhoushan 316013;Zhoushan Haicheng Construction Co.,Ltd.,Zhoushan 316012)
出处
《中国建材科技》
CAS
2021年第2期24-26,共3页
China Building Materials Science & Technology
关键词
掺膨胀剂混凝土
膨胀率
重复性误差
外径千分尺
concrete with expansion agent
expansion rate
repeatability error
outside micrometer
