The purpose of this study is to develop standard reference materials that can simulate the flow characteristics of cement paste, which is the most basic constituent of concrete. To satisfy the required characteristics of the particulate standard reference material, the candidate composition of the standard reference material for cement paste was selected. Limestone, slag, silica and kaolin were selected as cement substitute and glycerol and corn syrup were selected as matrix fluid substitute. Distilled water was selected as the water substitute.
The selected candidates were analyzed for flow characteristics using rheological analysis. When analyzing the cement substitute, the combination of silica and kaolin showed non-linearity and was not satisfied with the required properties of the standard reference material. In addition, when observing the chemical changes over time, the chemical reaction occurred in the mixing using the slag, and the strength was exhibited. When analyzing the matrix fluid substitute, after about 15 days of mixing with corn syrup, chemical reactions such as mold were observed and were not satisfied with the standard material requirements. Thus, the constituents of the final standard reference material for cement paste were selected as a combination of limestone, glycerol and water. In order to use the composition of the selected standard reference material, we tried to determine the mixing ratios of the standard reference material that can simulate the mixing ratios of the cement paste aiming at on-site applicability and use. Firstly, the effect of each component of standard reference material on flow characteristics was analyzed. As a result, limestone affected the yield stress, and the ratios of water to glycerol affected the plastic viscosity. Based on these results, the mixing ratios of standard reference materials that can simulate the flow characteristics of cement paste were suggested. The flow characteristics values of all materials are most closely related to the temperature. In this study, the tendency of the flow characteristics of cement paste and standard reference materials with temperature in the range of 5℃ ∼ 40℃ was analyzed based on the construction conditions. As a result, the flow characteristics of the cement paste and the standard reference material showed a tendency to decrease with increasing temperature, and at the same time, the tendency to change the flow characteristics was similar. In conclusion, the combination of the developed standard reference materials for cement paste with limestone, glycerol, and water is a standard that can simulate the flow characteristics of cement paste with a constant quality under various construction environmental conditions and various mixing ratios of cement paste.