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| 1931 |
| Committee C12 first organized |
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| 1937 |
| Reorganization meeting of Committee C12 provides first record of officers, scope, approved bylaws, and establishes subcommittee on methods of test. |
|
| 1938 |
Three additional standing subcommittees established:
Specifications for Mortar Sand, for Mortar Workability and Plasticity |
|
| 1939 |
| First tentative standard published: ASTM C 144-39T, Tentative Specification for Aggregate for Masonry Mortar |
|
| 1941 |
| First mortar specification published: ASTM C 161-41T, Tentative Specification for Mortar for Reinforced Brick Masonry, contained alternate property and proportion specifications |
|
| 1942 |
| All subcommittees except Workability and Plasticity discharged because of work connected with the war that was being done by members. |
|
| 1951 |
| ASTM C 270-51 T, Tentative Specification for Mortar for Unit Masonry, published, containing alternate property and proportion specifications and mortar type designations: A-1, A-2, B, C, and D. |
|
| 1954 |
Mortar type designations were changed for Specification
C 270-54T changed to M, S, N, O, and K. |
|
| 1957 |
ASTM C 404-57T, Tentative Specification for Aggregate
for Masonry Grout, published. |
|
| 1958 |
An informal symposium on mortars held in St. Louis
with around 100 in attendance. |
|
| 1961 |
ASTM C 476-61T, Tentative Specification for Mortar
and Grout for Reinforced Masonry. |
|
| 1968 |
ASTM C 270-64T, Tentative Specification for Mortar
for Unit Masonry becomes ASTM C 270-68, Standard
Specification for Mortar for Unit Masonry. |
|
| 1973 |
A short appendix providing guidance on selection
of mortar type added to ASTM C 270-73. |
|
| 1974 |
| First ASTM Masonry Symposium conducted jointly with C07 on Lime and C15 on Manufactured Masonry Units. ASTM Special Technical Publication of proceedings published in 1975. |
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| ASTM C 780-74, Method for Field Testing of Mortar, approved. |
|
| 1978 |
ASTM C 887-78, Specification for Packaged, Dry, Combined
Material for Surface Bonding Mortar approved. |
|
| 1980 |
ASTM C 270-80a includes additional information
in appendix on mortar selection. |
|
ASTM C 476-80 limits scope of standard to grout
for reinforced and non reinforced unit masonry.
|
|
| 1981 |
ASTM C 946-81, Practice for Construction of Dry-Stacked,
Surface-Bonded Walls approved. |
|
| 1982 |
| Subcommittee C12.98 Long Range Planning established |
|
| Significant revisions in ASTM C 270-82a clarify scope as including mortar for reinforced and nonreinforced masonry and distinguish between proportion and property specifications. |
|
| 1984 |
| ASTM C 1019-84 on Sampling and Testing Grout approved. |
|
| 1989 |
| An extensive explanatory appendix added to ASTM C 270-89. |
|
| 1990 |
ASTM C 1148-90, Test Method for Measuring
Drying Shrinkage of Mortar approved. |
|
| ASTM C 1142-90, Specification for Ready-Mixed Mortar approved. |
|
| 1991 |
| ASTM C 1180-91, Terminology of Mortar and Grout approved. |
|
| 1998 |
ASTM C 1384-98, Specification for Modifiers
for Masonry Mortars approved. |
|
| 1999 |
ASTM C 1403-99, Test Method for Rate of Water
Absorption of Masonry Mortars approved. |
|
| 2002 |
ASTM C 1324-02, Test Method for Examination
and Analysis of Hardened Mortar approved. |
|
| 2004 |
ASTM C 1586-04, Guide for Quality Assurance
of Masonry Mortars approved. |
