Evaluating Applications of Field Spectroscopy Devices to Fingerprint Commonly Used Construction Materials (Phase IV–Implementation) (2014) / Chapter Skim
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Standard Practice for Identification of Water Reducing, Accelerating, and Retarding Chemical Admixtures in Fresh Portland Cement Concrete by Attenuated Total Reflection Infrared Spectrometer AASHTO Designation SP XX-14 1. SCOPE 1.1 This method covers the qualitative identification of the type of a chemical admixture for portland cement concrete (PCC)
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2. REFERENCED DOCUMENTS 2.1 ASTM Standards: C494, Standard Specification for Chemical Admixtures for Concrete C1017, Standard Specification for Chemical Admixtures for Use in Producing Flowing Concrete C260, Standard Specification for Air-Entraining Admixtures for Concrete 3.
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5.4 The ATR spectrometer should be connected to a data acquisition system (normally, a computer with an accompanying software) all the time during a test.
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vapor-related absorption bands from the sample spectrum. Store the ATR absorbance spectrum in numerical format for further processing as needed.
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8.1.1.2 Calcium nitrate is identified by a strong and wide band at 1330±5 cm-1 with distinctive shoulder at 1410±5 cm-1due to NO2 and two medium and sharp peaks at 1047±5 and 826±5 cm-1 associated with nitrate anion NO3. 8.1.2 Water Reducers (ASTM C494, Types A and D)
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Appendix A Example of chemical composition and spectral features for PCC admixtures Table A-1 summarizes classification and chemical composition of the admixtures described in this standard.
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FIGURE A-1. Composition of the ATR spectrum of PCC sample modified with High Range Water Reducer (HRWR)
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FIGURE A-3. Composition of the ATR spectrum of PCC sample modified with Water Reducer/Retarder (after Yut and Zofka, 2012)
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