ASTM C1585-2011 Standard Test Method for Measurement of Rate of Absorption of Water by Hydraulic-Cement Concretes《测量水硬水泥混凝土吸水率的标准试验方法》.pdf
《ASTM C1585-2011 Standard Test Method for Measurement of Rate of Absorption of Water by Hydraulic-Cement Concretes《测量水硬水泥混凝土吸水率的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1585-2011 Standard Test Method for Measurement of Rate of Absorption of Water by Hydraulic-Cement Concretes《测量水硬水泥混凝土吸水率的标准试验方法》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1585 11Standard Test Method forMeasurement of Rate of Absorption of Water by Hydraulic-Cement Concretes1This standard is issued under the fixed designation C1585; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the ye
2、ar of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method is used to determine the rate ofabsorption (sorptivity) of water by hydraulic cement concreteb
3、y measuring the increase in the mass of a specimen resultingfrom absorption of water as a function of time when only onesurface of the specimen is exposed to water. The specimen isconditioned in an environment at a standard relative humidityto induce a consistent moisture condition in the capillary
4、poresystem. The exposed surface of the specimen is immersed inwater and water ingress of unsaturated concrete is dominatedby capillary suction during initial contact with water.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard
5、.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced
6、Documents2.1 ASTM Standards:2C31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete Ag-gregatesC192/C192M Practice for Making and Curing Concr
7、eteTest Specimens in the LaboratoryC642 Test Method for Density, Absorption, and Voids inHardened ConcreteC1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hydraulic Cements3. Terminology3.1 For definitions of terms used in this sta
8、ndard, refer toTerminology C125.4. Significance and Use4.1 The performance of concrete subjected to many aggres-sive environments is a function, to a large extent, of thepenetrability of the pore system. In unsaturated concrete, therate of ingress of water or other liquids is largely controlled byab
9、sorption due to capillary rise. This test method is based onthat developed by Hall3who called the phenomenon “watersorptivity.”4.2 The water absorption of a concrete surface depends onmany factors including: (a) concrete mixture proportions; (b)the presence of chemical admixtures and supplementary c
10、e-mentitious materials; (c) the composition and physical charac-teristics of the cementitious component and of the aggregates;(d) the entrained air content; (e) the type and duration ofcuring; (f) the degree of hydration or age; (g) the presence ofmicrocracks; (h) the presence of surface treatments
11、such assealers or form oil; and (i) placement method includingconsolidation and finishing. Water absorption is also stronglyaffected by the moisture condition of the concrete at the time oftesting.4.3 This method is intended to determine the susceptibilityof an unsaturated concrete to the penetratio
12、n of water. Ingeneral, the rate of absorption of concrete at the surface differsfrom the rate of absorption of a sample taken from the interior.The exterior surface is often subjected to less than intendedcuring and is exposed to the most potentially adverse condi-tions. This test method is used to
13、measure the water absorptionrate of both the concrete surface and interior concrete. Bydrilling a core and cutting it transversely at selected depths, theabsorption can be evaluated at different distances from theexposed surface. The core is drilled vertically or horizontally.4.4 This test method di
14、ffers from Test Method C642 inwhich the specimens are oven dried, immersed completely in1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.66 on Concretes Resistance to Fluid Penetration.Current edi
15、tion approved July 1, 2011. Published August 2011. Originallyapproved in 2004. Last previous edition approved in 2004 as C1585041. DOI:10.1520/C1585-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMSta
16、ndards volume information, refer to the standards Document Summary page onthe ASTM website.3Hall, C., “Water Sorptivity of Mortars and Concretes: A Review,” Magazine ofConcrete Research, Vol. 41, No. 147, June 1989, pp. 51-61.1*A Summary of Changes section appears at the end of this standard.Copyrig
17、ht ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.water at 21C, and then boiled under water for 5 h. In this testmethod, only one surface is exposed to water at room tempera-ture while the other surfaces are sealed simulating waterabsorption i
18、n a member that is in contact with water on oneside only. Test Method C642, on the other hand, is used toestimate the maximum amount of water that can be absorbedby a dry specimen and therefore provides a measure of thetotal, water permeable pore space.5. Apparatus5.1 Pan, a watertight polyethylene
19、or other corrosion-resistant pan large enough to accommodate the test specimenswith the surfaces to be tested exposed to water.5.2 Support Device, rods, pins, or other devices, which aremade of materials resistant to corrosion by water or alkalinesolutions, and which allow free access of water to th
20、e exposedsurface of the specimen during testing. Alternatively, thespecimens can be supported on several layers of blotting paperor filter papers with a total thickness of at least 1 mm.5.3 Top-pan Balance, complying with Specification C1005and with sufficient capacity for the test specimens and acc
21、urateto at least 6 0.01 g.5.4 Timing Device, stop watch or other suitable timingdevice accurate to 6 1s.5.5 Paper Towel or Cloth, for wiping excess water fromspecimen surfaces.5.6 Water-Cooled Saw, with diamond impregnated blade tocut test specimens from larger samples.5.7 Environmental Chamber, a c
22、hamber allowing for aircirculation and able to maintain a temperature of 50 6 2C anda relative humidity at 80 6 3 %. Alternatively, an oven able tomaintain a temperature of 50 6 2C and a dessicator largeenough to contain the specimens to be tested is permitted. Therelative humidity (RH) is controlle
23、d in the dessicator at 80 60.5 % by a saturated solution of potassium bromide. Thesolubility of potassium bromide is 80.2 g/100 g of water at50C. The solution shall be maintained at the saturation pointfor the duration of the test. The presence of visible crystals inthe solution provides acceptable
24、evidence of saturation.5.8 Polyethylene Storage Containers, with sealable lids,large enough to contain at least one test specimen but not largerthan 5 times the specimen volume.5.9 Caliper, to measure the specimen dimensions to thenearest 0.1 mm.6. Reagents and Materials6.1 Potassium Bromide, Reagen
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