欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    AASHTO TP 120-2016 Standard Method of Test for Pore Index for Carbonate Coarse Aggregate.pdf

    • 资源ID:418398       资源大小:131.61KB        全文页数:5页
    • 资源格式: PDF        下载积分:2000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要2000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    AASHTO TP 120-2016 Standard Method of Test for Pore Index for Carbonate Coarse Aggregate.pdf

    1、Standard Method of Test for Pore Index for Carbonate Coarse Aggregate AASHTO Designation: TP 120-161Release: Group 3 (August 2016) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-1c TP 120-1 AASHTO Standard Method

    2、of Test for Pore Index for Carbonate Coarse Aggregate AASHTO Designation: TP 120-161Release: Group 3 (August 2016) 1. SCOPE1.1. This test method covers the determination of the pore index values for carbonate (limestone anddolomite) coarse aggregate for Portland Cement (PC) Concrete.1.2. The values

    3、stated in SI units are to be regarded as the standard.1.3. This standard does not purport to address all of the safety concerns associated with its use. It isthe responsibility of the user of this procedure to establish appropriate safety and health practicesand to determine the applicability of reg

    4、ulatory limitations prior to its use.2. REFERENCED DOCUMENTS2.1. AASHTO Standards: M 231, Weighing Devices Used in the Testing of Materials T 27, Sieve Analysis of Fine and Coarse Aggregates3.3.1. SUMMARY OF TEST METHODThe method uses water pressure at 240 kPa (35 psi) to force water into the aggreg

    5、ate pores. A measurement is made of the volume of water that is forced into the aggregate during a period between 1 min and 15 min after application of the pressure.4. SIGNIFICANCE AND USE4.1. The pore index test is used to quickly assess the pore system of carbonate coarse aggregates andidentify po

    6、tential freeze-thaw durability issues for use in PC Concrete.4.2. Carbonate aggregates with secondary pore index values of 20 or below have a pore system that isgenerally indicative of an aggregate that will be resistant to freeze-thaw damage in air entrainedPC Concrete. Higher secondary pore index

    7、values indicate a larger pore system that is generallyindicative of an aggregate susceptible to freeze- thaw damage in air entrained PC Concrete(Reference 13.1.).5. APPARATUS5.1. Iowa Pore Index UnitA measuring device consisting of a Pressure Chamber, chamber pressurecontrol device, chamber pressure

    8、 measurement device, and a chamber volume measurementdevice. See Figure 1. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-1c TP 120-2 AASHTO 5.2. Pressure ChamberA metal or plastic container of suffi

    9、cient volume to hold 1000 g to 4500 g of normal weight carbonate aggregate. The container must be corrosion resistant and capable of withstanding 240 kPa (35 psi) pressure. The top plate shall have a vent such that the air can be forced out of the chamber as it is filled with water. The container sh

    10、all have an inlet at or near the base through which water is supplied. Note 1One such instrument that has been used successfully for this testing is shown in Figure 1. Note 2A clear pressure chamber will allow the operator to visually determine when all the entrapped air bubbles have been removed pr

    11、ior to pressurizing. 5.3. Chamber Pressure Control DeviceThe chamber pressure control device shall be capable of applying and controlling pressure to within 240 3 kPa (35 0.5 psi). The pressure shall be applied such that 240 3 kPa (35 0.5 psi) is achieved within 6 s for the chamber with water only a

    12、nd within 12 s for the chamber and the aggregate under test. The device may consist of a pneumatic pressure regulator, or any other device capable of applying and controlling pressures to the required tolerances. 5.4. Chamber Pressure Measurement DeviceThe chamber pressure measurement device shall b

    13、e capable of measuring the pressures to the tolerances given in Section 5.2. It may be a pressure manometer, electronic pressure transducer, or any other device capable of measuring pressures to the stated tolerances. 5.5. Chamber Volume Measurement DeviceThe chamber volume measurement device shall

    14、be capable of measuring volume change to a precision of at least 0.1 percent of the sample volume for the primary reading and 0.05 percent of the sample volume for the secondary reading. 5.6. TimerA timing device that can be read or can record elapsed time to the nearest second. 5.7. BalanceThe bala

    15、nce shall have a capacity of 5000 g and comply with M 231 class G 2. Figure 1Iowa Pore Index Unit 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-1c TP 120-3 AASHTO 6. STANDARDIZATION 6.1. The volume

    16、change in the chamber when pressurized must be determined and used to correct the test readings. This should be done at least once a day prior to performing a test. 6.2. Fill the chamber with room temperature water. Ensure that all entrapped air is removed from the chamber. 6.3. Apply the 240 kPa (3

    17、5 psi) pressure. Record the volume change at 60 s and 15 min. 6.4. The results from the standardization test should not vary by more than 10 percent from the previous standardization results. 7. PREPARATION OF TEST SPECIMEN 7.1. Sieve the sample over the 19.0 mm (3/4in.) sieve and the 12.5 mm (1/2in

    18、.) sieve. Obtain a sufficient amount of material retained on the 12.5 mm ( in.) sieve to provide for enough oven dried material for the test. Note 3Smaller sizes of aggregate have been used in the test. The pore index results are generally lower when aggregates smaller than the 12.5 mm (1/2in.) are

    19、used (Section 13.2). 7.2. Wash the material and dry it in an oven or a suitable pan or vessel to constant mass at a temperature of 110 5C (230 9F). Allow it to cool to room temperature. 8. PROCEDURE 8.1. Weigh out the desired test sample size and record the mass to the nearest 0.5 g. 8.2. Place the

    20、test sample in the pressure chamber and close and seal the lid. 8.3. Start the timer and begin filling the chamber with room temperature water. Make sure that all large entrapped air bubbles are removed by rocking the chamber or tapping the sides of the chamber. Some aggregates will release small ai

    21、r bubbles during the filling process. 8.4. Initialize or zero the volume measuring device. 8.5. Apply the pressure at 90 5 s from the time the chamber filling began. 8.6. Check for any water or air leaks. 8.7. Record the water volume change at 60 s and 15 min from the time the pressure was applied.

    22、Note 4Recording volume readings at more frequent intervals or for more than 15 min may provide additional useful information about the pore structure. 8.8. After the final reading, release the pressure and allow the sample to drain. 9. CALCULATIONS 9.1. The pore index values are calculated as follow

    23、s: 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-1c TP 120-4 AASHTO ( )1 1019000 Primary Pore Index Value V Vs VW= (1) ( )15 15 1 119000 Secondary Pore Index Value V Vs Vs VW= (2) where: W1 = Initia

    24、l sample mass, g; VS1 = Water volume reading at 60 s from the standardization test, mL; VS15 = Water volume reading at 15 min from the standardization test, mL; V0 = Initial water volume reading, mL; V1 = Water volume reading at 60 s, mL; and V15 = Water volume reading at 15 min, mL. 10. REPORT10.1.

    25、 Report the mass of the dry test sample to the nearest 0.5 g.10.2. Report the 60-s and 15-min standardization readings.10.3. Report the primary and secondary pore index values to the nearest whole number.11. PRECISION AND BIAS11.1. PrecisionNo precision has been established for this method.11.2. Bia

    26、sNo bias has been established for this method.12. KEYWORDS12.1. Aggregate durability; aggregate pores; concrete freeze-thaw; pore index.13. REFERENCES13.1. Myers, J. D., and W. Dubberke. Iowa Pore Index Test. Interim Report ML80-02. Iowa Departmentof Transportation, Ames, IA, 1980.13.2. Davis, C. P.

    27、 Influence of Particle Size and Specimen Preparation on the Iowa Pore Index. MastersThesis. Missouri University of Science and Technology, Rolla, MO, 2011.1This provisional standard was first published in 2016. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.


    注意事项

    本文(AASHTO TP 120-2016 Standard Method of Test for Pore Index for Carbonate Coarse Aggregate.pdf)为本站会员(livefirmly316)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开