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Questions related from San Ty
Hi All, I am checking curing of paste and for some paste there I no exothermic peak and only endothermic peak shown. Probably curing is complete however what does the endothermic peak indicate?...
18 June 2020 7,490 0 View
I'm relative new in this field and looking for experts in the area of food powders and liquid dispensing and processing. Particularly in the area of lab based research and characterisation for...
07 February 2019 10,045 2 View
I would like to know if extensometer is necessary to determine yield strength of nickel 718 alloy? Or using cross head movement to estimate the sample strain is sufficient? I'm using 0.2% offset.
14 January 2019 7,307 7 View
I would like to store hot nickel alloy such at in625 and in718 in nitrogen environment after heated to 200C. May I know if there is any potential reaction that might occur between the nitrogen gas...
13 October 2018 864 3 View
I have several samples that have been mounted however the sample height differs, which means the working distance will differ as well. May I know how this will influence the the image captured in...
26 March 2018 8,031 4 View
Signals collected by bse detector comes from materials penetrated by electron beam. The higher the kV the greater the penetration. So my question is, contrast in color seen in the image due to...
18 November 2017 4,409 3 View
Extensometer has to be removed before sample fails to prevent damage to the device. If that's the case how do I obtain the strain at failure (since extensometer is removed before failure)? Do I...
12 March 2017 7,092 3 View
Hi I have attached a DSC graph in this post. Based on my interpretation theres two Tg in this graph? Is my analysis correct? If not, how do I analyse this?
21 February 2017 6,776 10 View
There are two components of sulfate ions for acid rain, one from the sea and the other from pollution. Does the sulfate ions from the sea contribute acidity to the rain. Also based on the chemical...
24 October 2016 676 5 View
Based on the following standard ASTM C 39 and C 192, the 28 curing time does it include the time at which the concrete is inside the mold? If yes, which means it will be cured 1 day in the mold...
31 August 2016 838 17 View
I have been looking for method to increase hydroxyl group on epoxy resin surface. From what I know I can use acid or base to break the epoxide group to produce hydroxyl group? May I get your...
01 August 2016 9,817 4 View
When testing of fiber reinforced composite materials (esp for rebar used for concrete reinforcement) acid durability, is there a any available standard for it? Or any good literature that I can...
24 July 2016 2,300 1 View
Does testing material at different strain rate cause the elastic modulus to change?
12 July 2016 9,777 5 View
I have observed that for circular smooth or ribbed FRP rebar, requires steel tubings filled with epoxy to ensure proper gripping during tensile testing. How about smooth and ribbed steel? Do I...
27 June 2016 878 0 View
Hi all, i was looking through a standard for FRP tensile test, it was stated that the extensometers or LVDTs used should be capable of recording specimen elongation during testing with an accuracy...
21 May 2016 4,913 3 View
Other than achieving its maximum mechanical properties, at molecular level does it mean that all epoxide groups have underwent ring opening reaction with hardener? If yes, a fully cured epoxy will...
18 April 2016 6,269 7 View
I am planning to use aminosilane eg. APTMS, APS and etc. What I have read is that it needs to stored in cool, dark and dry place whereas for transferring of silane to beaker of water alcohol...
20 December 2015 2,422 6 View
As above. Or will it depend on the resin and hardener utilized? Any reading recommendations on cured epoxy? (I am more interested in the covalent bond and chemical structure of cured epoxy) Thank...
30 November 2015 4,747 8 View
