ASTM C457/C457M-12
硬化混凝土空气孔隙系统参数显微测定的标准试验方法
Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete
ASTM C457/C457M-12 发布历史
ASTM C457/C457M-12由美国材料与试验协会 US-ASTM 发布于 2012。
ASTM C457/C457M-12 在中国标准分类中归属于: Q13 混凝土、集料、灰浆、砂浆。
ASTM C457/C457M-12 发布之时，引用了标准
- ASTM C125 与混凝土和混凝土骨料有关的标准术语
- ASTM C138/C138M 混凝土密度（单位重量） 产量和空气含量（重量）的标准试验方法
- ASTM C173/C173M 采用容积法测定新拌混凝土含气量的标准试验方法*， 2023-07-06 更新
- ASTM C231 用压力法测定新拌混凝土中空气含量的标准试验方法
- ASTM C42/C42M 混凝土钻取试样和锯取试样的制备和试验用标准试验方法
- ASTM C666/C666M 混凝土抗急速冻结和解冻的标准试验方法*， 2023-07-06 更新
- ASTM C670 建筑材料的试验方法的配备精密度和偏差说明的标准实施指南
- ASTM C672/C672M 混凝土表面暴露于除冰化学品的耐候性的标准试验方法
- ASTM C823 建筑用硬化混凝土检测和取样的标准实施规程
- ASTM C856 硬化混凝土岩相检验的标准实施规程
- ASTM D92 用克利夫兰开杯测定闪点和燃点的标准试验方法
* 在 ASTM C457/C457M-12 发布之后有更新，请注意新发布标准的变化。
ASTM C457/C457M-12的历代版本如下：
- 2023年 ASTM C457/C457M-23 硬化混凝土中空隙系统参数微观测定的标准试验方法
- 2016年 ASTM C457/C457M-16 淬火混凝土空气系统参数显微测定的标准试验方法
- 2012年 ASTM C457/C457M-12 硬化混凝土空气孔隙系统参数显微测定的标准试验方法
- 2011年 ASTM C457/C457M-11 硬化混凝土孔隙系统参数显微测定的标准试验方法
- 2010年 ASTM C457/C457M-10a 硬化混凝土中的空腔系统的参数的显微镜检验的标准试验方法
- 2010年 ASTM C457/C457M-10 硬化混凝土中空气孔隙系统参数的显微测定用标准试验方法
- 2009年 ASTM C457-09 淬火混凝土空气系统参数显微测定的标准试验方法
- 2008年 ASTM C457-08d 硬化混凝土中空隙系统参数微观测定的标准试验方法
- 2008年 ASTM C457-08c 硬化混凝土中空隙系统参数微观测定的标准试验方法
- 2008年 ASTM C457-08b 硬化混凝土中空隙系统参数微观测定的标准试验方法
- 2008年 ASTM C457-08a 硬化混凝土中空隙系统参数微观测定的标准试验方法
- 2008年 ASTM C457-08 淬火混凝土空气系统参数显微测定的标准试验方法
- 2006年 ASTM C457-06 显微法测定硬化混凝土中孔隙系统参数的标准试验方法
- 1998年 ASTM C457-98 硬化混凝土中孔隙系统参数的显微测定的标准试验方法
5. Significance and UseTop Bottom
5.1 The parameters of the air-void system of hardened concrete determined by the procedures described in this test method are related to the susceptibility of the cement paste portion of the concrete to damage by freezing and thawing. Hence, this test method can be used to develop data to estimate the likelihood of damage due to cyclic freezing and thawing or to explain why it has occurred. The test method can also be used as an adjunct to the development of products or procedures intended to enhance the resistance of concrete to cyclic freezing and thawing (1).
5.2 Values for parameters of the air-void system can be obtained by either of the procedures described in this test method.
5.3 No provision is made for distinguishing among entrapped air voids, entrained air voids, and water voids. Any such distinction is arbitrary, because the various types of voids intergrade in size, shape, and other characteristics. Reports that do make such a distinction typically define entrapped air voids as being larger than 1 mm in at least one dimension being irregular in shape, or both. The honey-combing that is a consequence of the failure to compact the concrete properly is one type of entrapped air void (9, 10).
5.4 Water voids are cavities that were filled with water at the time of setting of the concrete. They are significant only in mixtures that contained excessive mixing water or in which pronounced bleeding and settlement occurred. They are most common beneath horizontal reinforcing bars, pieces of coarse aggregate and as channelways along their sides. They occur also immediately below surfaces that were compacted by finishing operations before the completion of bleeding.
5.5 Application of the paste-air ratio procedure is necessary when the concrete includes large nominal maximum size aggregate, such as 50 mm [2 in.] or more. Prepared sections of such concrete should include a maximum of the mortar fraction, so as to increase the number of counts on air voids or traverse across them. The ratio of the volume of aggregate to the volume of paste in the original mix must be accurately known or estimated to permit the calculation of the air-void systems parameters from the microscopically determined paste-air ratio.
Note 1???The air-void content determined in accordance with this test method usually agrees closely with the value determined on the fresh concrete in accordance with Test Methods C138/C138M, C173/C173M, or C231 (
- 标准号
- ASTM C457/C457M-12
- 发布
- 2012年
- 发布单位
- 美国材料与试验协会
- 替代标准
- ASTM C457/C457M-16
- 当前最新
- ASTM C457/C457M-23
- 引用标准
- ASTM C125 ASTM C138/C138M ASTM C173/C173M ASTM C231 ASTM C42/C42M ASTM C666/C666M ASTM C670 ASTM C672/C672M ASTM C823 ASTM C856 ASTM D92