Astm D4373 Jun 2026

: It is a primary tool for verifying the success of Microbially Induced Calcite Precipitation (MICP) —a green technology that uses bacteria to "cement" loose sand together to prevent erosion or liquefaction.

In techniques such as Microbially Induced Calcite Precipitation (MICP) or lime treatment, ASTM D4373 is used to measure how much strength-enhancing carbonate has been precipitated. astm d4373

Grind the dried sample into a fine powder. A finer powder ensures complete reaction with the acid. : It is a primary tool for verifying

One of the key strengths of ASTM D4373 is its reliance on simple, portable equipment. The core apparatus is a or a volumetric calcimeter (commonly a Chittick apparatus or a simple pressure gauge device). The procedure is methodical yet rapid. First, an oven-dried soil sample (typically passing a No. 40 or No. 200 sieve) is weighed and placed into a reaction vessel. Dilute hydrochloric acid (usually 3N or 6N) is placed in a separate, isolated container within the same sealed vessel. The system is then sealed, and the initial volume or pressure is recorded. Subsequently, the apparatus is tilted or agitated to bring the acid into contact with the soil, initiating the reaction. After the reaction ceases and the system returns to ambient temperature, the final volume of CO₂ (or the pressure change) is recorded. Using a calibration curve or a direct calculation based on the ideal gas law, the percent carbonate is determined. The entire test often takes less than 15 minutes per sample. A finer powder ensures complete reaction with the acid

) gas . The pressure of this generated gas is directly proportional to the amount of carbonate in the sample.

The Critical Role of ASTM D4373 in Geotechnical and Environmental Engineering