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 Post subject: Re: Sand op die teer pad na Olifants?
Unread postPosted: Wed Jul 25, 2012 8:47 am 
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I tend to agree with billyf's explanation. I was told that because of the high temperatures, the tar starts to melt. Sand is then strewn on the road to slow or prevent the melting. As said, this is not my explanation but what I have been told.

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Last edited by Rooies on Wed Jul 25, 2012 8:53 am, edited 1 time in total.

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 Post subject: Re: Sand op die teer pad na Olifants?
Unread postPosted: Wed Jul 25, 2012 9:15 am 
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DrPhil wrote:
I don't know if this is still the case but about 15 years ago my dad asked one of the most senior rangers in the park why there is sand on the tar roads during the summer months. We asked specifically why during summer because this was when the sand was on all the roads in the park, from about October.

The answer he gave made sense: It is to protect the feet of the animals that do not have hooves. With temperatures reaching the mid 40s the black roads get very hot and burns the feet of the animals.


I can go along with this, when I was much, much younger and when UK had a REAL summer :? it occasionally got so hot that it melted the tar on roads.
I was paddling in a brook and ran across such a road in my bare feet. What a mistake! I ended up with tar sticking to me feet and boy oh boy did it hurt! :(
So protecting animal's feet really makes sense.

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 Post subject: Re: Sand op die teer pad na Olifants?
Unread postPosted: Wed Jul 25, 2012 9:50 am 
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Rooies wrote:
I was told that because of the high temperatures, the tar starts to melt. Sand is then strewn on the road to slow or prevent the melting. As said, this is not my explanation but what I have been told.

And it is the correct one. It is to protect the road from damage.

And very handy as you can see spoor on the road now!

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 Post subject: Re: Sand op die teer pad na Olifants?
Unread postPosted: Wed Jul 25, 2012 10:31 am 
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I can understand the sand on the roads during summer, as that would achieve exactly the same result - sand is forced into the soft tar and helps to maintain the road. Am not so sure about protecting animal feet - most animals with padding on their feet, e.g. cats, have pretty tough feet and will leave the roads if they are uncomfortable. Maybe its to keep lions on the roads for us tourists?? :D

But the original query was about sand on the road in mid-winter, so even in Kruger the roads won't be hot enough for molten tar.

Can one of the mods direct a question to Sanparks, specifically the chief road Engineer in KNP and get the correct answer??? :hmz:

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 Post subject: Re: Sand op die teer pad na Olifants?
Unread postPosted: Wed Jul 25, 2012 10:51 am 
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Be interesting to get the correct answers.
I have actually seen them dumping the sand on the H3, think it was last year and they even have a machine with a type of brush that spreads it evenly on the road.
I was pretty sure its to help with road maintenance as the sand gets driven into the tar when its gets soft from the sun.

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 Post subject: Re: Sand op die teer pad na Olifants?
Unread postPosted: Wed Jul 25, 2012 1:10 pm 


Hi Guys.

Thanx for the replies on my question. I just want to ad something. If the answers about the animals feet or road maintenace is correct, why only on the road to olifants? That cant posible be the hottest part of the Kruger? There are no roads with sand on North in the Shingwedzi or Pafuria area where it gets hotter. And it cant be because there is no sand there is alot of dry river beds al the way up there.

:hmz:


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 Post subject: Re: Sand op die teer pad na Olifants?
Unread postPosted: Wed Jul 25, 2012 1:48 pm 
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There is (or has been in the past) sand on the road between Skukuza and Malelane, by the junction with the main road to Pretoriouskop.

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 Post subject: Re: Sand op die teer pad na Olifants?
Unread postPosted: Wed Jul 25, 2012 2:09 pm 
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I think they do it on a sort of rotational method, so not all roads will have sand on them all the time.
I do recall the road from Shingwedzi, H1-7 had sand on for many kms northwards last year and also the H10 has as well.
And as Sara and I have said the H3 down towards Malelane.
Also the H11 towards Kruger Gate at one time.

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 Post subject: Re: Sand op die teer pad na Olifants?
Unread postPosted: Wed Jul 25, 2012 2:20 pm 
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I have seen some of these roads developing corrugations with the sand on them.

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 Post subject: Re: Sand on the tar road near Olifants?
Unread postPosted: Wed Jul 25, 2012 8:17 pm 
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A few years ago they resurfaced the road near Punda and they rounded if off by spreading sand on the new surface so I would assume that it is done for maintenace purposes.


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 Post subject: Re: Sand on the tar road near Olifants?
Unread postPosted: Thu Jul 26, 2012 7:49 am 
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Hi 'mites :hello:

This is part of our road maintenance programme, it is done on all our roads from time to time as and when the need arises to stabilize the roads.

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 Post subject: Re: Sand on the tar road near Olifants?
Unread postPosted: Thu Jul 26, 2012 10:34 am 
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Thanks Lesego but, can someone be a bit more specific? In what way does the strewing of sand help with the maintenance? The sand must have some sort of effect on the tar, but what is that? One don't see this anywhere else where there are tarred roads.

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 Post subject: Re: Sand on the tar road near Olifants?
Unread postPosted: Thu Jul 26, 2012 10:39 am 
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North of Shingwedzi is also a heck of a lot of sand on the tar road!

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 Post subject: Re: Sand on the tar road near Olifants?
Unread postPosted: Thu Jul 26, 2012 11:00 am 
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I don't buy into this answer. I think it is just a quick SANP reply to a non important question. Sand is normally applied onto the road surface during summer months. It makes no sense to do so in winter and besides that, this particular road has had sand on it more often than not.

But whatever the reason is, I don't think it is important enough to have a whole topic about and SANP spending time on answering it.

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 Post subject: Re: Sand on the tar road near Olifants?
Unread postPosted: Thu Jul 26, 2012 12:05 pm 
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I have seen the tar melt due to the hot sun ( especially in the far north ) , and the sand would actually keep it cooler , stopping it from melting :tongue: .

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