Souradeep Gupta

12 Questions 15 Answers 0 Followers

Questions related from Souradeep Gupta

How does sulfur/sulfate incorporation in calcium carbonate affect its hardness and strength?

It is reported that sulfate can be incorporated in the vaterite polymorph of calcium carbonate. I am interested to know how the incorporation influences the physical properties, strength/hardness...

24 February 2024 2,639 2 View

Is there any investigation/knowledge into possible shrinkage of biochar pores due to desorption of absobed moisture?

I am wondering if there is any published literature that looks into dimensional stability of biochar pores, and whether such pores shrink when the previously absorbed moisture is released under...

23 December 2020 6,098 5 View

Is there any research linking rheology of cement paste/mortar to drying shrinkage?

Addition of fine fillers may lead to increase in drying shrinkage at early age. They also influence the rheology - viscosity and yield stress at fresh state. Is there any study investigating the...

24 April 2020 1,429 0 View

Can addition of filler of high surface area result in expansion of freshly cast cement mortar?

I added carbon based filler ( surface area > 230 m2/g) to cement mortar to replace some cement. The temperature of the fresh mixture felt slightly higher than previously cast control mixes with...

29 May 2019 3,725 9 View

Is there a chance of oil deposition on biochar surface, when (cooked food waste) is pyrolyzed in a muffle furnace?

Biochar was prepared from cooked food waste ( meat, vegetables and rice) n a sealed furnace at 500 degrees. However, I notice some oily residues on the surface. Is it because the oil from food is...

18 September 2017 7,934 2 View

If flexural strength test is performed under displacement control settings, would the peak load be significantly higher than load control results?

I did displacement controlled testing (0.05mm/min) of 40x40x160 mm mortar bar and the flexural strength result seems to be between 11-14 MPa, while other studies report only between 7-10 MPa for...

31 May 2017 9,084 2 View

What is the effect of alkali washing of biochar containing adsorbed/absorbed CO2?

If biochar containing adsorbed/absorbed CO2 is washed with alkali at room temperature ,would it result in generation of more pores in the biochar?

29 November 2016 2,060 17 View

What kind of carbonate polymorphs may be present in saw dust derived biochar prepared at 300 degrees?

I have prepared biochar from mixed wood saw dust at 300 degrees. XRD pattern show sharp peaks at 2-theta = 37.8 , 44.06, 64.38 and 77.5. Does it say anything about presence of calcium carbonate...

14 November 2016 5,932 8 View

How can we measure the percentage of C-S-H in hardened cement paste at a certain age by thermogravimetry (TGA)?

Is there any similar expression to measure percentage of C-S-H in hardened cement paste like that in case of CH and CaCO3 by TGA.

04 September 2016 9,737 5 View

If carbon dioxide saturated biochar is subject to alkaline environment ( temp about 50-60 degrees), would there be any change in its pore structure?

Biochar from saw dust is saturated by passing carbon dioxide over it. Then that char is subjected to high alkaline environment ( calcium/potassium hydroxide). SEM images show many pores in the...

20 August 2016 6,524 3 View

XRD to determine phases in hardened mortar : does lower peak of Calcium hydroxide (CH) and steeper peak of CSH necessarily mean higher hydration?

I conducted XRD for two samples, let's say M1 and M2 ,Strength of M1> Strength of M2 In XRD, M1 shows less intense peak of CH and steeper peak for CSH while M2 shows steeper peak of CH. Does...

29 June 2016 6,494 3 View

Is there any research that quantitatively states the impact of microfibers on rate cement hydration ?

For example, does addition of PP fibers by 2-4% volume fraction affect early hydration of concrete?

22 December 2015 6,724 1 View