SPECIAL TESTS
ASTM C1038
ASTM C150 Standard Specification for Portland Cement allows SO3 value to exceed the limit provided that the cement will not develop expansion exceeding 0.020% at 14 days by ASTM C1038 Standard Test Method for Expansion of Hydraulic Cement Mortar Bars stored in Water. When there is too much sulfate, expansion may become excessive.
ASTM C1012
In ASTM C1012, Standard Test Method for Length Change of Hydraulic Cement Mortars Exposed to a Sulfate Solution, the mortar bars made using Test Method C109 are cured until they attain 20.0MPa compressive strength using cubes, and then the bars are immersed in the sulfate solution. Subsequent determination of length change is done at certain intervals up to 6 months or 1 year. This method is used to assess the sulfate resistance of mortars made using Portland and Blended cements.
ASTM C1567
The test result of ASTM C1567 Standard Test Method for Determining the Potential Alkali-Silica Reactivity of Combinations of Cementitious Materials and Aggregates (Accelerated Mortar-Bar Method) is only valid for a specific combination of pozzolan, slag and reactive aggregates used. The mortar prepared using the graded aggregates, cement and pozzolan or slag are molded and placed in the moist cabinet for one day, then in the oven for another day, will be immersed in NaOH solution, placed in the oven, and subsequent measurements of expansion will be made within 14 days.
ASTM C1260
It is recommended to test the same aggregate and hydraulic cement (without the pozzolan or slag) using Test Method C1260 Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method). This method aims to detect the potential of an aggregate (for use in concrete) to undergo alkali-silica reaction resulting in potentially deleterious internal expansion. Result can be determined within 16 days following the same procedure as C1567.
