Hi,
I hope someone can enlighten me on what is the reason for ASTM to change the limit of heat of hydration value on Table 4 from 255kJ/kg @ 3days to 335kJ/kg @ 3days? This is a huge increase on the limit making the common type 1 cement compliant to type 2-MH as well. Will this change leads to...
We are planning to use a flowable fill as alternative backfill (subgrade level) on our utility trenched located on major roads. My major concerns are the following:
1. How long would it take (hours?days?) for the flowable fill to sufficiently harden before we can place a cement treated base on...
Is there any reference document that provides guideline on sizing of blow off assembly as per main water line diameter? Is there any reference computation? For example, can a 600mm dia. main line have the same size of blow assembly with a 2meter dia. main line?
Hi All,
I would like to ask the opinions of you guys on which is the better material to be used as sealant for the sluice gate in our wastewater treatment facilities. Is it EPDM (ethylene propylene diene monomer (M-class) rubber) or Polyurethane type? The thing is of course this will be exposed...
Hi everyone. My question concerns the backfill on our pipe trenches. Our Contractors always say that the reason they are not utilizing the native material as backfill to our trenches is the problem with rain. They are saying that when their compacted backfill is exposed to rain (I expect...
Hi All,
I am working as a Standards Manager in a water utility Company and currently we are having issues on the applicability of the backfill material we are using on our trenches and the right compaction method to be applied. I have attached a drawing of a typical trench section. As you can...
Hi to all,
I would like to ask if one can use gravel as bedding for a 900mm diameter steel pipe. If yes, what will be the size limit for the gravel to be used? Can you guys site any reference standards or documents to prove this usage? Thank you for those who can answer.
Hi all,
I am new in the design of bridges and I would like to ask for opinions regarding the design of longitudinal beams directly supporting the slab above. Is it fine to subject the longitudinal beam to the full load of an MS18 truck loading/ lane loading for example (i.e. 324kN gross...
Hi all,
We have a project regarding retrofitting of communication towers wherein I'll add an aditional angle bar to an existing diagonal member which is an angle bar as well of the same size. So the resulting section is a double angle. Now regarding the spacers to be place along the length of...
