AASHTO T 178-2015 Standard Method of Test for Portland-Cement Content of Hardened Hydraulic-Cement Concrete.pdf
《AASHTO T 178-2015 Standard Method of Test for Portland-Cement Content of Hardened Hydraulic-Cement Concrete.pdf》由会员分享,可在线阅读,更多相关《AASHTO T 178-2015 Standard Method of Test for Portland-Cement Content of Hardened Hydraulic-Cement Concrete.pdf(12页珍藏版)》请在麦多课文档分享上搜索。
1、Standard Method of Test for Portland Cement Content of Hardened Hydraulic-Cement Concrete AASHTO Designation: T 178-15 ASTM Designation: C1084-10 American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-3c T 178-1 AASHTO St
2、andard Method of Test for Portland Cement Content of Hardened Hydraulic-Cement Concrete AASHTO Designation: T 178-15 ASTM Designation: C1084-10 1. SCOPE 1.1. This test method covers the determination of portland cement content of a sample of hardened hydraulic-cement concrete. 1.2. The values in SI
3、units are to be regarded as the standard. The values given in parentheses are provided for information purposes only. 1.3. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropr
4、iate safety and health practices and determine the applicability of regulatory limitations prior to use. Disposal of some or all of the chemicals used in this method may require adherence to EPA or other regulatory guidelines. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 92, Wire-Cloth Sieves fo
5、r Testing Purposes M 231, Weighing Devices Used in the Testing of Materials T 24M/T 24, Obtaining and Testing Drilled Cores and Sawed Beams of Concrete T 105, Chemical Analysis of Hydraulic Cement T 248, Reducing Samples of Aggregate to Testing Size 2.2. ASTM Standards: C670, Standard Practice for P
6、reparing Precision and Bias Statements for Test Methods for Construction Materials C823/C823M, Standard Practice for Examination and Sampling of Hardened Concrete in Constructions C856, Standard Practice for Petrographic Examination of Hardened Concrete D1193, Standard Specification for Reagent Wate
7、r E832, Standard Specification for Laboratory Filter Papers 3. SIGNIFICANCE AND USE 3.1. This test method consists of two independent procedures: an oxide-analysis procedure that consists of two subprocedures and an extraction procedure. Each procedure requires a substantial degree of chemical skill
8、 and relatively elaborate chemical instrumentation. Except for the 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-3c T 178-2 AASHTO influence of known interference, determined cement contents are nor
9、mally equal to, or slightly greater than, actual values except for the maleic acid procedure, where results can also be significantly low when the paste is carbonated (Note 1). Note 1With certain limitations, the procedure is also applicable for eliminating the combined content of portland cement an
10、d pozzolan or slag in concretes made with blended hydraulic cement and blends of portland cement with pozzolans and slags. The results of this test method when applied to concretes made with blended cements or pozzolans depend on the composition of the pozzolan, the age of the concrete, the extent o
11、f the reaction of the pozzolan, and the fact that this test method may determine only the portland cement component of a blended cement. The test method should be applied to the determination of the blended cement content or the pozzolanic content only by use of calibration concrete samples or other
12、 information. Earlier versions of this test method can provide useful information as detailed by Hime1and Minnick.24. INTERFERENCES 4.1. Many constituents of concrete may interfere with the analysis of the concrete for portland cement content. The following limited lists of materials have been provi
13、ded as a guide. The rocks, minerals, or mineral admixtures listed will interfere with the cement content determination to the extent of their solubility during the dissolution procedure used. The solubility of rocks, minerals, or mineral admixtures may depend on the fineness of the test sample, the
14、water/cement ratio of the concrete, the extent of hydration, and the age of the concrete (extended exposure of the high pH of the concrete may affect the solubility of some minerals). 4.2. Substances Affecting Calcium Oxide Subprocedure: 4.2.1. The following are soluble in even the cold dilute hydro
15、chloric acid of this procedure and will contribute a high bias to the cement content calculated from the soluble calcium oxide: limestone, marble, dolomitic limestone, calcareous sandstone, calcareous chert, and caliche-encrusted and calcite- or dolomite-coated rocks. 4.2.2. The following may be sol
16、uble depending on the age and pH of the concrete; whether the mineral present is glassy or crystalline, or weathered or strained; and the fineness of the minerals present, and, if soluble, will bias the cement content calculated from the soluble calcium oxide high depending on the calcium content of
17、 the minerals: weathered or altered plagioclase feldspar, caliche-encrusted rocks, altered volcanic rocks (with calcareous inclusions), and many other calcium containing rocks. 4.2.3. Every percent of soluble calcium oxide that is contributed by soluble aggregate or mineral admixtures will bias the
18、cement content high by approximately 1.6 percent. 4.2.4. Silica fume may lower the acid solubility of the sample and hence bias the result low. 4.3. Substances Affecting the Soluble Silica Subprocedure: 4.3.1. The following may be soluble depending on the age and pH of the concrete; whether the aggr
19、egate is glassy or crystalline, or weathered or strained; and the fineness of the minerals: chert, opal, chalcedony, glassy volcanic rock, strained quartz (highly strained), quartzite, cataclastic rocks (mylonite, phyllonite), gneiss, schist, metagraywacke, and many other soluble silicon-containing
20、rocks and minerals. 4.3.2. Every percent of soluble SiO2contributed by aggregate or mineral admixtures will bias the reported cement content high by approximately 4.7 percent. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violati
21、on of applicable law.TS-3c T 178-3 AASHTO 4.3.3. Silica fume may lower the acid solubility of the sample and hence bias the result low. If the digestion time or temperature are sufficient to digest all of the portland cement, the silica fume will also be solubilized and bias the calculated cement co
22、ntent high. 4.4. Substances Affecting the Maleic Acid Procedure: 4.4.1. The same substances that are soluble in the soluble calcium or the soluble silica subprocedures may be soluble in the maleic acid procedure. (See Sections 4.2.1, 4.2.2, and 4.3.1.) 4.4.2. Every 1 percent of the sample that is ag
23、gregate or mineral admixture dissolved by the maleic acid will bias the cement content high by 1 percent. 4.4.3. Carbonated cement paste may not be soluble in the maleic acid-methanol dissolution and thus may bias the cement content results low. 4.4.4. The unhydrated iron and aluminum phases of the
24、portland cement may not be soluble in the maleic acid and, if not soluble, will bias the cement content low. This may be significant at early ages and less significant at later ages. 5. APPARATUS 5.1. Choose the apparatus from applicable items given in T 105 and from the following: 5.1.1. Chipmunk (
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
本资源只提供5页预览,全部文档请下载后查看!喜欢就下载吧,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- AASHTOT1782015STANDARDMETHODOFTESTFORPORTLANDCEMENTCONTENTOFHARDENEDHYDRAULICCEMENTCONCRETEPDF

链接地址:http://www.mydoc123.com/p-418127.html