细集料棱角性测定仪计量校准

细集料棱角性测定仪计量校准性能特点 1.当工程上同时使用不同品种细集料，如将天然砂和机制砂、石屑混用时，应分别进行单一细集料品种的棱角性质量评定，同时以实际配合比例组成的细集料混合料进行试验，以评定其使用性能。
2.按T0327方法以水洗法除去小于0.075mm的粉尘部分，取0.075mm~2.36mm或0.075mm~4.75mm的试样约6kg放入105℃±5℃烘箱中烘干至恒干至恒重，在室温下冷却。
3.按本规程T0328的方法测定试样的表观相对密度Уa，用分料器法或四分法将试样分成不少于5份，按下式计算每份试样所需的质量，称量准确至0.1g。
m=1.0×Уa/2.70
式中：m—每份试样的质量（kg）；
Уa—该试样的表观相对密度，无量纲。
4.根据试验的细集料规格选择漏斗，对规格0.075mm~2.36mm的细集料选用漏出孔径为12mm的漏斗，对规格0.075mm~4.75mm的细集料选用孔径为16mm的漏斗，将漏斗与圆筒连接安装成一整体。关闭漏斗下方的开启门，在漏斗下方置接受容器。
5.将试样从圆筒中央开口处（高度与筒顶齐平）徐徐倒入漏斗，表面尽量倒平，但倒完后不得以任何工具扰动或刮平试样。
6.在打开漏斗开启门的同时开动表，漏斗中细集料随时即从漏斗开口处流出，进入接受容器中。在细集料全部流完的同时停止表，读出细集料流出的时间，准确至0.1s，即为该细集料试样的流动时间。
7.一次试验需平行试验5次，以流动时间的平均值作为细集料棱角性的试验结果。
Hebei Huajian Metrology & Testing Co. , Ltd. was established in 2017, the company in July 2017 according to CNAS-CL01:2006“Testing ａnd calibration laboratory accreditation criteria”; The quality management system has been established ａnd operated by CNAS-CL25 ａnd CNAS-CL52 standards such as the application specification of the accreditation criteria for testing ａnd calibration laboratories in the field of calibration According to the JJF1033 examination standard, the measurement standard is prepared, ａnd the uncertainty evaluation, stability ａnd repeatability examination are carried out for all the verification/calibration projects. Through the length, temperature, mechanics, construction, traffic measurement equipment, chemical ａnd other fields of a number of measurement standards. Through the China National Accreditation Service for conformity assessment (CNAS) accreditation, certificate number: CNAS L11171. Can carry out the length, thermodynamics, mechanics, construction, traffic special measuring instruments, chemistry ａnd hundreds of other calibration projects.