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Questions related from Rajeev Roychand
Hi Everyone, Just wondering what's the best way to carry out the XRD of a surface of a 5mm thick round bar. Since the sample has to be flat for XRD analysis, the round surface may introduce...
10 October 2021 2,925 3 View
Hi everyone, My understanding is that pure carbon is highly stable at room temperature and does not react with alkaline solutions like that of Ca(OH)2. However i am struggling to find any...
02 May 2020 4,170 3 View
Hi everyone, I have a sample of bioash (produced from biosolids by heating in an oven at 550 deg centigrade - air environment). I have carried out x-ray fluoresence as well to identify the...
16 April 2020 6,315 3 View
Do all iron containing compounds show fluorescence in XRD with copper radiation or just the oxides of iron show this effect? Say for instance if i have pure tetracalcium aluminoferrite (C4AF) or...
09 June 2019 2,047 2 View
I did XRD on anhydrous sodium sulfate salt (purity>99%) which i bought couple of months ago. For some reason sodium sulpfate peaks from PDF database (anhydrous or hydrated) don't align with the...
27 March 2018 8,709 6 View
Just wondering if anybody has done thermogravimetric analysis on pure hemi and mono carboaluminate phases? I am looking for the mass loss of chemically bound water. Based on the references I have...
02 December 2016 7,839 2 View
What are the important factors to select chebychev polynomial order for background function in TOPAS. If am checking the degree of crystallinity and I start with modelling the amorphous hump, do I...
20 November 2016 9,507 4 View
I have a slag sample with following elemental oxide composition: CaO, SiO2, Al2O3, MgO, SO3 and also contains carbon (in calcite). I have managed to identify the following phases: Gypsum...
15 November 2016 1,448 9 View
I am using CIF files from ICSD database. In detailed view of the crystal structure file there are two options i.e. Published crystal structure data and Standardised crystal structure data. When...
30 July 2016 3,947 2 View
What is the best crystalline material that can be used for the XRD quantitative analysis for cementitious materials, with the instrument having Cu Anode. Also, does the particle size have to be of...
13 July 2016 7,599 4 View
I am trying to do quantitative analysis using Bruker TOPAS, I followed the following steps: Loaded scan Loaded emission profile: CuKa5_Berger Background Parameters: chebyshev polynomial 4 degree,...
08 July 2016 2,287 17 View
I am doing quantitative phase analysis of my hydrated cement paste sample at 7 day of curing. I have identified the following phases: Calcite, Larnite, Alite, Portlandite, Ettringite and...
16 June 2016 3,393 4 View
I am doing rietveld refinement of my hydrated cement paste samples and while varying various parameters I even sometime use flat plate absorption. That option brings about significant changes in...
05 May 2016 2,624 3 View
The major contribution towards strength development in OPC or blended cements containing SCMs is from C-S-H gel. Does C-A-H phases contribute towards strength development? If in calcium aluminate...
18 January 2016 1,053 7 View
Just wondering what is the best way to compare the hydration products of two mortar mix designs one with internally cured (25% SSD lightweight sand) and the other with 100% normal sand (control)?...
05 November 2015 1,214 1 View
The attached image shows a 28 day XRD spectra of a mix containing Cement, Fly ash, nano silica and alumina powder. There is an amorphous hump between 5 and 10 deg 2theta. The peak that i have...
26 July 2015 1,162 11 View
I am currently practicing image analysis software ImageJ so that I can use it in my experiment to quantify unreacted flyash and silica fume particles. My mix design contains cement, flyash and...
15 April 2015 1,044 6 View
Can anyone help me in providing me XRD peaks locations for C4AH12 (Calcium aluminate hydrate)? Also, i would highly appreciate if you could provide a reference article as well
22 January 2015 9,255 1 View
I have used Set accelerator in my blended cement mixes containing cement, flyash and nano silica. The strength of the mix containing SA is lower than the one without it. Set accelerator produced...
22 December 2014 1,830 1 View
I have got large amount of nano silica which i had ordered last year for my research, but after reading about risks associated with silica that can go into your body through breathing i'm bit...
22 July 2014 8,105 1 View
I have to perform an accelerated carbonation test on cylindrical mortar samples. I am wondering if anybody knows what sort of epoxy can be used for covering the flat surfaces, so that only the...
28 April 2014 5,204 1 View
Hi everyone, I have conducted an xrd on the waste tyre crumb rubber particles. It shows an amorphous hump centred around 20 degree two theta, few Zinc Oxide peaks and another two peaks (around...
01 January 1970 2,372 3 View
I have conducted XRD and TGA of powdered slag sample. XRF data shows about 4.5% of MgO. Derivative curve of the TG data (pic attached) show a mass loss between 290 and 480 °C, with the endothermic...
01 January 1970 8,171 8 View
