ASTM C1105-08a (R2016) PDF Download

ASTM C1105-08a (R2016) is a standard test method for evaluating the length change of concrete due to alkali-carbonate rock reaction. This method specifically focuses on the alkali-carbonate reaction involving dolomite in certain calcitic dolomites and dolomitic limestones. It should be noted that this test method is not suitable for detecting combinations of aggregates susceptible to expansion due to alkali-silica reaction.

The purpose of this test method is to assess the potential for concrete expansion caused by alkali-carbonate rock reaction under prescribed laboratory curing conditions. However, it is important to acknowledge that the laboratory conditions may differ from actual field conditions, such as wetting and drying cycles, temperature variations, and other factors. Thus, the test results may not accurately represent the performance of concrete in real-world scenarios.

This test method is particularly valuable when evaluating samples of aggregate that have been determined to contain constituents that could participate in a potentially deleterious alkali-carbonate rock reaction. These constituents can be identified through petrographic examination, the rock cylinder test, by examining service records, or by a combination of these methods.

The results obtained from tests conducted according to this standard should be considered when making decisions about whether precautions should be taken to mitigate excessive expansion due to alkali-carbonate rock reaction. It is recommended to make these decisions before using a specific cement-aggregate combination in concrete construction. Additional elements and precautions that may be part of the decision-making process are described in Appendix X1.

In addition to evaluating specific cement-aggregate combinations, it is also useful to conduct control tests using the aggregate of interest with other cements or the cement of interest with other aggregates. This provides further insights into the behavior of the materials and helps in making informed decisions.