tailieunhanh - Designation: C 207 – 91 (Reapproved 1997) - Hydrated Lime for Masonry Purposes1

This standard is issued under the fixed designation C 207; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. | Designation C 207 91 Reapproved 1997 Standard Specification for Hydrated Lime for Masonry Purposes1 This standard is issued under the fixed d ii r atic n c 207 the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. 1. Scope This specification ct T v e íỉ foLir ttypcs of hydralcd lime. Types N and S are suitable for use in mortar in scratch and brown coats of cement plaster for stucco and for addition to portland-cement concrete. Types NA and SA are air-entrained hydrated limes that are suitable for use in any of the above uses where the inherent properties of lime and air-entrainment are desired. The four types of lime sold under this speci cation shall be designated as follows Type N Nomal hydrated iime oor maooniy pirrposcs. Type S Special hydrated iime oor maooniy purposes. Type NA Normal ai--cntraining hydrated iime oor masonry purposes. Type SA Special air-entraining hydrated iime oor masonry purposes. Note 1 Type s special hydraeed lime and Type SA. special arr-entraining hydrated lime are differentiated from Type N normal hydrated lime and Type NA normal air-entraining hydrated lime principally by their ability to develop high early plasticity and higher water retentivity and by a limitation on their unhydrated oxide content. Note 2 lòa normal Type N and sp cíal Type S finishing hydrated lime refer to SpeciN cníioi c 206. Note 3 Some l ulkin g codes poohibít the uee of air-ciltl aillillg malc-rials in mortar because of the accompanying reduction in bond and compressive strength. Where increased freeze-thaw resistance is important air-entraining may be bene cial. Air-entraining lime should not be used as a .