ASTM_C_1579_-_13.pdf

Designation:C157913Standard Test Method forEvaluating Plastic Shrinkage Cracking of Restrained FiberReinforced Concrete(Using a Steel Form Insert)1This standard is issued under the fixed designation C1579;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year 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 compares the surface cracking of fiberreinforced concrete panels with the surface cracking of controlconcrete panels subjected to prescribed conditions of restraintand moisture loss that are severe enough to produce crackingbefore final setting of the concrete.1.2 This test method can be used to compare the plasticshrinkage cracking behavior of different concrete mixturescontaining fiber reinforcement.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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.(Warningfreshhydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.2)2.Referenced Documents2.1 ASTM Standards:3C125 Terminology Relating to Concrete and Concrete Ag-gregatesC143/C143M Test Method for Slump of Hydraulic-CementConcreteC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC403/C403M Test Method for Time of Setting of ConcreteMixtures by Penetration ResistanceC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction Materials3.Summary of Test Method3.1 Panels of control concrete and fiber reinforced concreteare prepared in a prescribed manner and are exposed tocontrolled drying conditions after finishing.The drying condi-tions(see Note 1)are intended to be severe enough to induceplastic shrinkage cracking in test panels made of controlconcrete.The evaporation rate from a free water surface ismonitored by pans placed next to the panels in the environ-mental chamber.NOTE1An important parameter in this method is the rate ofevaporative water loss,which is controlled by the atmospheric conditionssurrounding the test specimens.Since the concrete specimens will notalways have the same rate of water evaporation as the pan of water(dueto evaporative and bleeding effects),the rate of evaporation of 1.0 kg/m2hfrom the pan of water represents the minimum evaporation rate that mustbe attained for this test(1).4The moisture loss from the concrete testpanels can also be monitored and reported,however,the rate of evapora-tion from the free surface of the water in the pan is the parameter thatshould be used to quantify the drying environment.3.2 The test is terminated at the time of final setting of theconcrete determined in accordance with Test Method C403/C403M.At 24 h from initial mixing,the average crack widthis determined.3.3 A cracking reduction ratio(CRR)is computed from theaverage crack width for the fiber-reinforced concrete panelsand the average crack width for the control concrete panels.4.Significance and Use4.1 The test method is intended to evaluate the effects ofevaporation,settlement,and early autogenous shrinkage on theplastic shrinkage cracking performance of fiber reinforcedconcrete up to and for some hours beyond the time of finalsetting(see Terminology C125).4.2 The measured values obtained from this test may beused to compare the performance of concretes with differentmixture proportions,concretes with and without fibers,con-cretes containing various amounts of different types of fibers,1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.42 on Fiber-Reinforced Concrete.Current edition approved April 1,2013.Published May 2013.Originallypublished in 2006.Last previous edition approved in 2012 as C1579 06(2012).DOI:10.1520/C1579-13.2Section on Safety Precautions,Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards,Vol 04.02.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4The boldface numbers in parentheses refer to the list of references at the end ofthis standard.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 and concretes containing various amounts and types of admix-tures.For meaningful comparisons,the evaporative conditionsduring te