ASTM C1761 C1761M-2013b Standard Specification for Lightweight Aggregate for Internal Curing of Concrete《混凝土内部固化用轻集料的标准规格》.pdf
《ASTM C1761 C1761M-2013b Standard Specification for Lightweight Aggregate for Internal Curing of Concrete《混凝土内部固化用轻集料的标准规格》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1761 C1761M-2013b Standard Specification for Lightweight Aggregate for Internal Curing of Concrete《混凝土内部固化用轻集料的标准规格》.pdf(10页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1761/C1761M 13aC1761/C1761M 13bStandard Specification forLightweight Aggregate for Internal Curing of Concrete1This standard is issued under the fixed designation C1761/C1761M; the number immediately following the designation indicates theyear of original adoption or, in the case of re
2、vision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers lightweight aggregate intended to provide water for internal curing of c
3、oncrete. It includes testmethods for determining the absorption and desorption properties of lightweight aggregate.NOTE 1Internal curing provides an additional source of water to sustain hydration and substantially reduce the early-age autogenous shrinkage andself-desiccation that can be significant
4、 contributors to early-age cracking. Appendix X1 provides guidance on calculating the quantity of lightweightaggregate for internal curing.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivale
5、nts; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance. Some values have only SI units because the inch-pound equivalents are not used inpractice.NOTE 2Sieve size is identified by its standard designation in Specificat
6、ion E11. The alternative designation given in parentheses is for informationonly and does not represent a different standard sieve size.1.3 The text of this standardspecification references notes and footnotes that provide explanatory material. These notes andfootnotes (excluding those in tables and
7、 figures) shall not be considered as requirements of the standard.1.4 This standardspecification does not purport to address all of the safety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appropriate safety and health practices and dete
8、rmine the applicability ofregulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C29/C29M Test Method for Bulk Density (“Unit Weight”) and Voids in AggregateC40 Test Method for Organic Impurities in Fine Aggregates for ConcreteC87 Test Method for Effect of Organic Impurities
9、in Fine Aggregate on Strength of MortarC114 Test Methods for Chemical Analysis of Hydraulic CementC125 Terminology Relating to Concrete and Concrete AggregatesC128 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Fine AggregateC136 Test Method for Sieve Analysis of Fin
10、e and Coarse AggregatesC142 Test Method for Clay Lumps and Friable Particles in AggregatesC330/C330M Specification for Lightweight Aggregates for Structural ConcreteC641 Test Method for Iron Staining Materials in Lightweight Concrete AggregatesC702 Practice for Reducing Samples of Aggregate to Testi
11、ng SizeC1498 Test Method for Hygroscopic Sorption Isotherms of Building MaterialsC1608 Test Method for Chemical Shrinkage of Hydraulic Cement PasteC1698 Test Method for Autogenous Strain of Cement Paste and MortarD75 Practice for Sampling AggregatesE11 Specification for Woven Wire Test Sieve Cloth a
12、nd Test Sieves1 This specification is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.21 onLightweight Aggregates and Concrete.Current edition approved June 15, 2013Aug. 1, 2013. Published August 2013September 2013
13、. Originally approved in 2012. Last previous edition approved in 2013 asC1761/C1761M 13.C1761/C1761M 13a. DOI: 10.1520/C1761_C1761M-13a.10.1520/C1761_C1761M-13b.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of
14、 ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technicall
15、y possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C7
16、00, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this practice, refer to Terminology C125.3.2 Definitions of Terms Specific to This Standard:3.2.1 absorption, A72, nof lightweight aggregate, the increase in mass of a specimen of
17、 oven-dry lightweight aggregate dueto water penetrating into the permeable pores of the particles after being submerged for 72 h, expressed as percentage of oven-drymass.3.2.2 autogenous shrinkage, nreduction in volume due to chemical shrinkage of a sealed cementitious mixture, not subjectedto exter
18、nal forces and under constant temperature, measured from the time of final setting.3.2.2.1 DiscussionThe chemical shrinkage leads to emptying of the internal pores (see self-desiccation) that causes the formation of menisci in thepartially water-filled pores. The menisci in turn give rise to interna
19、l tensile stresses that cause bulk shrinkage. While autogenousshrinkage is due to the chemical shrinkage, the magnitude of autogenous shrinkage is less than the chemical shrinkage after settingoccurs, because the aggregate particles and the hydrated cement paste network restrain the shrinkage. The r
20、estraint may in turn leadto cracking.3.2.3 chemical shrinkage, nthe reduction in volume of cementitious paste that occurs during hydration because the hydrationproducts occupy less volume than the volume occupied originally by the water and unhydrated cementitious materials.3.2.4 density (OD), nof l
21、ightweight aggregate, the mass of oven-dry lightweight aggregate particles per unit volume ofaggregate particles, where the volume includes the permeable and impermeable pores within the particles but does not include thevoids between the particles.3.2.5 desorption, nof lightweight aggregate, the de
22、crease in mass of lightweight aggregate originally containing absorbedwater due to water leaving the permeable pores as the aggregate attains moisture equilibrium with the surrounding environmentmaintained at constant temperature and a relative humidity less than 100 %.3.2.6 internal curing, nsupply
23、ing water within a cementitious mixture using pre-wetted lightweight aggregate, or othermaterials that readily release water from within the particles, thereby mitigating self-desiccation and sustaining hydration.3.2.7 oven-dry (OD), adjrelated to lightweight aggregate particles, the condition in wh
24、ich the specimen of lightweightaggregate has been dried by heating in an oven at 110 6 5 C 230 6 10 F for sufficient time to reach a constant mass.3.2.8 relative density, (OD), nof lightweight aggregate, the ratio of the density (OD) of the lightweight aggregate to thedensity of water at a stated te
- 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
10000 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:
- ASTMC1761C1761M2013BSTANDARDSPECIFICATIONFORLIGHTWEIGHTAGGREGATEFORINTERNALCURINGOFCONCRETE 混凝土 内部 固化

链接地址:http://www.mydoc123.com/p-465759.html