Hi friends, today we are going to talk about
bulking of sand bulking of sand you guys must be familiar with this term if you
are not then what it means is the increase in increase in volume of sand due to
volume of sand due to presence of moisture due to presence of moisture okay so
how it happens the moisture develops a film around the particles of sand and
due to the surface tension push apart the sand particles occupying the larger
volume if this is the sand particle then here the water will come and push them
apart occupying larger problem okay so now let's see this happens during the
winter season mostly okay winter season so if you are on site you need to know
about this phenomena as this can be detrimental and if it is not rectified then
the resulting the mixer concrete mix will be honeycombed and even yield in some
cases okay so first we have to find by what factor the sound stand is bulked so
to find that you have to do you need a container any container of definite
regular shape container of okay so that's great container of regular shape
whose internal volume can be calculated easily columns can be calculated and in
on-site you mostly have the batch by volume so this is particularly very
dangerous. Maximum sand bulking can go up to the forty percent up to the 40 percent
and maximum bulking happens at two percent of moisture content at a moisture
content four percent of moisture contained so let's see how to determine this
okay let me show you all this and here we have here we have a container then fill
this container with sand okay fill this container with sand till top don't tamp
it don't tamp okay just fill it loosely as it is and then if you have the
volume of sand volume and let's say it's the Vm wet volume okay then
what you do is this is the soil okay so what you do is then add water and
saturate it okay saturate it okay with water so now bottom decreases and the
new volume will be hiked this one okay so height the same this one calculate the
volume let it be Vs okay so the factor by which the sand has Bulked
let's calculate the bulking
factor okay Bulking factor is ratio of moist volume divided by the saturated sand
volume okay as we saturate the sand volume decreases that means ratio greater
than 1. This may go a maximum bulking factor will be what I told you 40% is the
maximum bulking that can happen so the maximum bulking factor is 1.4 and occurs
at 4 percent up moisture content so this much for this video I will come up with
another video with similar things that can happen in the site okay and you please
comment on the video that what type of the tutorials you need thanks for
watching. 😊
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