1.1 This test method covers the determination of length change of mortar bars immersed in a sulfate solution at a temperature of 5.0 2.0 C [41.0 3.5 F]. Mortar bars made using mortar described in Test Method C109/C109M are cured until they attain a compressive strength of 20.0 1.0 MPa [3000 150 psi], as measured using cubes made of the same mortar, before the bars are immersed. 1.2 The purpose of this test method is limited to the evaluation of the resistance to thaumasite sulfate attack of cementitious binders containing more than 5% interground limestone.
The test method addresses a cool temperature form of thaumssite sulfate attack not covered by other test methods. It is needed as a result of the recent adoption of Type I-L cements in C595. It is expected that an expansion limit for this test will be specified in C595
Keywordsacceptability; expansion; fly ash; mortars; pozzolans; slag; thaumasite sulfate attack; sulfate-resisting cements;
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
R. Doug Hooton
Draft Under Development