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From page 214... ... 214 Repeatability and Reproducibility of FTIR Spectra Evaluating the repeatability and reproducibility of the results produced by the portable Fourier transform infrared (FTIR) equipment was necessary before making any recommendations for the further use of this equipment in the field study in Phase 3. Read the entire page →
From page 215... ... 215 Table P.1. List of Materials Tested by Attenuated Total Reflectance FTIR in Reproducibility and Repeatability Study Material Category Brand/Material Name Composition Material State Test Objective Structural coatings Carbozinc 859 2Part A : 1Part B:10 Filler 1Part A : 1Part B Powder Reproducibility study Scotchkote 1Part A : 1Part B Solid Reproducibility study Pavement markings 3M White 100% Ready Liquid Reproducibility study Epoplex LS50 Yellow 2Part A : 1Part B Solid Reproducibility study Portland cement concrete with admixtures Lafarge Type 2 cement/ local aggregates/ Air 200/Retarder 75 8.0% Water 17% Cement 31.9% Stone 35.2% Sand 0.2% Air 200 Wet mix Repeatability study Lafarge Type 2 cement/ local aggregates/ Retarder 75 8.0% Water 17% Cement 31.9% Stone 35.2% Sand 0.3% Air 200 Wet mix Repeatability study Reproducibility study Polymer-modified asphalt binders PG 64-22 modified by Kraton SBS PG 64-22 East + 1% SBS PG 64-22 East + 3% SBS PG 64-22 East + 6% SBS PG 64-22 West + 1% SBS PG 64-22 West + 3% SBS PG 64-22 West + 6% SBS Viscous solid Repeatability study Table P.2. Read the entire page →
From page 216... ... 216 Table P.3. Between Variation of Major Band Absorbance for Paint Carbozinc 859 Major Bands (cm1) Read the entire page →
From page 217... ... 217 varied significantly because of the nonuniform thickness of samples in the KBr pellets, while in ATR refl ectance mode, the path length was set to a constant value of 1 µm. Because the path length of transmission IR samples remained unknown, it precluded a quantitative comparison of the concentrations of different functional groups as yielded by the two spectrometers. Read the entire page →
From page 218... ... 218 Figure P.1. Comparison of major absorbance bands identified by ATR and IR spectrometers for Carbozinc 859 Part A Read the entire page →
From page 219... ... 219 Variability in x-Ray Fluorescence Results A two-phase approach was adopted for all materials. Single measurements were first employed to establish proof of concept, that XRF can yield measurable results for each material. Read the entire page →
From page 220... ... 220 Several replicates of each mix were investigated for both the error associated with preparing different mixes and the variability within a single mix. Samples are named accordingly (i.e., Sample Mix # - Replicate #) Read the entire page →
From page 221... ... 221 The average Zn content was 74.3%, which is in reasonable agreement with the 81% quoted in the MSDS, given that the XRF was measured for the wet paint and not the dry film (drying of the paint will have a concentrating effect on the Zn content) Read the entire page →
From page 222... ... 222 Both materials exhibited significantly higher variability in their composition than all previous materials tested by XRF. This is expected because aggregates are natural materials. Read the entire page →
From page 223... ... 223 composition. However, the background and peak intensity of the various peaks differed, indicating variability in the quantitative distribution of the different phases. Read the entire page →
From page 224... ... 224 and the Terra XRD pattern, as well as the quantitative results for the first sample when the amorphous content was included in the analysis. The results showed that the low-resolution (LR) Read the entire page →
From page 225... ... 225 The exact same trends were obtained with the Lehigh cement as with the Lafarge cement. Again, both portable and stationary instruments yielded reasonable agreement with the expected mineral concentrations. Read the entire page →
From page 226... ... 226 portable equipment but remained within reasonable error. The major obstacle would be that software statistics showed that the signal-to-noise ratio of the Terra equipment was too low to trust the numerical goodness of fit. Read the entire page →
From page 227... ... 227 between the two identified phases. Thus, the error was not associated with the fitting itself; Figure P.6 shows that the obtained fitting was quite good. Read the entire page →
From page 228... ... 228 for strict mineralogical criteria) Read the entire page →
From page 229... ... 229 in two of the samples. They were calcite as a cement constituent and portlandite as a new phase derived from the hydration of portland cement. Read the entire page →

From page 214...

... 214 Repeatability and Reproducibility of FTIR Spectra Evaluating the repeatability and reproducibility of the results produced by the portable Fourier transform infrared (FTIR) equipment was necessary before making any recommendations for the further use of this equipment in the field study in Phase 3.