C109/C109M - 20a Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using2-in."or [5o-mm] Cube Specimens)

Designation: C109/C109M - 20a Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using2-in."or [5o-mm] Cube Specimens)1 1. Scope@ 1.1 This test method covers determination of the compres-sive strength of hydraulic cement mortars，using 2-in. or[50-mm] cube specimens. NonE 1——Test Method C349 provides an altermative procedure for thisdetermination (not to be usod for acceptanoe tcsts). 1.2 This test method covers the application of the test usingeither inch-pound or Sl units. The values staed in either SIunits or inch-pound units are to be regarded separatcly asstandard. Within the text, the SI units are shown in brackets.The values stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in noncon-formance with the standard. 1.3 Values in SI units shall be obtained by measurement inSl units or by approprialte conversion, using the Rules forConversion and Rounding given in lEEE/ASTM SI-10.ofmeasurements made in other units. 1.4 This sianrdard does nor puarport to address all of thesafety concernas.if any. associcted wirhirs use.It is rhere sponsibility of the user of this standard to establish cppro-priate sefery， healsha. and erivironetal practices and deter-rinre the applicabiliry of regalatory lirisations prior to sese.( Warning-Fresha beyddrauulic cewievtitious vixreres are causricancd way cause cherical burnas ro skin and rissuee upowprolonged exposure.-) 1.5 This interncrional standard was developed inr accor-cance with inrernatiowally recognized principles ow standcrd-izatior established in the Decisiow onr Principles for theDevelopmenr of InxternetionalStandardls.Guides and Recom-sewddaiionas issued by the World Trade Organization TecIraicalBarriers ro Trade (TBTy Comnitsee.