研究目的
To characterize lime-based mortar specimens containing oxblood using Fourier transform infrared (FT-IR) spectroscopy in transmission, reflection, and attenuated total reflection (ATR) modes, and to investigate the possible effects of oxblood addition on thermal decomposition, color change, as well as water repellency properties of mortars.
研究成果
The addition of oxblood into lime-based mortars leads to a preferential accumulation of proteins on the top surface, affecting the water repellency and color of the mortars. FT-IR reflection spectroscopy is recommended for non-destructive monitoring of compositional changes on the surface. The formation of amorphous calcium carbonate (ACC) is observed in specimens with oxblood addition, which could be stabilized through several mechanisms. However, the possibility of ACC transformation into crystalline phases over a longer period requires further research.
研究不足
The monitoring period of the mortars in this research is short compared to historic mortars, suggesting that the amorphous calcium carbonate (ACC) in the specimens with blood addition could transform into crystalline phases at a relatively longer period of time.
1：Experimental Design and Method Selection:
The study applied FT-IR spectroscopy in transmission, reflection, and ATR modes to analyze mortar specimens. Thermal analysis, color measurement, and static contact angle test were also used.
2：Sample Selection and Data Sources:
Mortar specimens were prepared based on a 19th-century Italian historic recipe. Fresh and dried oxblood were used as organic additives.
3：List of Experimental Equipment and Materials:
Equipment included a Konica Minolta CM-700d Spectrophotometer for color measurement, Thermo Scientific Nicolet iS50 FT-IR Spectrometer for transmission FT-IR, Alpha Bruker FT-IR portable spectrometer for reflection FT-IR, and Netzsch STA 409 PC instrument for TGA-DSC.
4：Experimental Procedures and Operational Workflow:
Mortar specimens were prepared by mixing lime with water/oxblood, then adding aggregate or inorganic additives. The mixed mortar paste was poured into molds and kept in laboratory conditions. Color, FT-IR, static contact angle, and thermal analyses were performed at various curing times.
5：Data Analysis Methods:
Data from FT-IR, color measurement, and static contact angle tests were analyzed to understand the effects of oxblood addition on mortar properties.
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