ASTM D806-19 PDF Download

The ASTM D806-19 standard provides a method for determining the cement content in mixtures of cement with soil or aggregate through chemical analysis. This test method is specifically designed for samples that have undergone a significant degree of cement hydration or hardening. For freshly mixed soil-cement mixtures, other test methods such as ASTM D2901 or D5982 are recommended for determining cement content.

The test method is based on the determination of calcium oxide (CaO) content in the sample through chemical analysis. However, it may not be applicable for soil-cement materials containing soils or aggregates that release significant amounts of dissolved calcium oxide (CaO) during the test.

The standard emphasizes the importance of competent personnel and suitable equipment and facilities in producing reliable results. Compliance with Practice D3740 is recommended to ensure competent and objective testing and sampling. However, it should be noted that compliance with this practice does not guarantee reliable results as they depend on various factors.

Additionally, the standard mentions that analysis using X-ray fluorescence in accordance with ASTM C114 may also be used for determining the calcium oxide (CaO) content of hardened soil-cement.

In terms of guidelines for significant digits and rounding, the standard refers to Practice D6026. All observed and calculated values should conform to these guidelines when comparing them with specific limits. The procedures outlined in the standard represent industry standards for collecting, recording, and calculating data. It is important to note that these procedures do not consider material variation, the purpose of obtaining the data, special purpose studies, or the user's objectives. Therefore, it is common practice to adjust the significant digits of reported data based on these considerations. However, the standard does not address the significant digits used in analysis methods for engineering design.