Chipseal vs Hotmix

**Big Dave** · 20th November 2008, 08:27

Originally Posted by Bass

What does PSV stand for?

Eindhoven.

_____

**Bass** · 20th November 2008, 09:56

Originally Posted by Big Dave

Eindhoven.

_____

It was actually a serious question, but I guess I asked for that.
I'm not a soccer fan (lawn snooker as my father used to call it) and so I even had to google it to find out what you were on about.

**sunhuntin** · 20th November 2008, 10:56

Originally Posted by The Stranger

20 trucks a day is a lot.
Sounds like the southern motorway, or perhaps Stanley st.

What's the problem?
The rougher the better, keeps you awake and on your toes. Means you have to work for your ride.

yes, 20 a day is a lot, but the factory must get at least that. so really its like 40 trucks, cos each truck that comes in also has to go out again. each truck is generally a truck and trailer. very few solo trucks come in.
i dont mind a bit of a rough road, but right on a corner like that could be dangerous, as there are usually large stones that have been flipped out of the holes by the trucks. im having to relearn that line to avoid the holes, which almost puts me on the footpath.

**jrandom** · 20th November 2008, 11:14

Roads are obviously dangerous things, and should be banned.

**slofox** · 20th November 2008, 11:54

One of my pet hates about chipseal is what I have dubbed "Road Eczema"...where the top layer of chipseal has parted company with the next layer down....so you get what are basically shallow potholes all over a road surface.....plays hell in corners, especially if you are moving along a little......one of the worst I hit was in a long sweeping left hander...didn't see it coming...the bike skipped closer and closer to the centre line and the oncoming traffic....fortunately the eczema ran out before I ran out of road.....but it did cause my knees to fell a little strange for a wee while afterwards.....

**cooneyr** · 20th November 2008, 11:56

Originally Posted by Ixion

They are both crap. The only decent thing to make a road out of is concrete. There are miles and miles of concrete road, laid down in the 1930s, with cars still driving on them. Except the idiots have covered the concrete with a thin layer of asphalt stuff.

Take a gander when they are doing repairs to some of the older roads, Mt Wellington Highway, Ellerslie Highway, Onewa Road, lots of others. When they strip the top couple of inches off, underneath is the old concretae raod.

Concrete. That's what we want. Or gravel. Why do the roads have to be sealed at all?

I agree with the gravel but I'm not so sure about the concrete. Yes concrete makes a good structural element of the pavement but it is damn expensive. The lifecycle costs are pretty high given the hugh upfront investment costs. Also concrete polishes pretty badly hence the hotmix over the top. Lastly bumpedy bumpedy bumpedy is bloody annoying - I'd rather ride on Chip seal (well gravel actually). This is another reason for mixing the surfacing.

There are a few sections of concrete road around Chch as well if you know where to look for them. Listen out for rythmic bumps next time you travel between Chch and Rolleston or between Kaiapoi and Pine Acres.

Cheers R

**Forest** · 20th November 2008, 18:15

If anyone is interested in doing some further reading, there is a huge amount of information at the following link:

http://www.transit.govt.nz/technical...cefriction.jsp

**Forest** · 20th November 2008, 18:19

Originally Posted by Bass

What does PSV stand for?

something something value presumably?

PSV = Polished Stone Value

This is a laboratory measurement of skid resistance for an individual aggregate. It is measured by subjecting the aggregate to a standard polishing process and then testing the aggregate with a Portable Skid Resistance Tester. The polishing procedure basically simulates what happens to aggregate that is laid on the road surface - so the PSV is basically a measurement of how much grip will be left after the road surface has been worn down by a couple of years worth of traffic.

The testing procedure and description of the testing process are set out in British Standard 812:Part 114.

**Bass** · 21st November 2008, 08:19

Originally Posted by Forest

PSV = Polished Stone Value

A sensible respose on KB.
It sometimes happens if I wait long enough.
Thanks mate

**slofox** · 21st November 2008, 13:45

So much for grip in wet or dry conditions.
Next question: Does the grip vary with temperature and if so, how so?

Over to you Forest.........

**Big Dave** · 21st November 2008, 13:52

Originally Posted by Bass

A sensible respose on KB.
It sometimes happens if I wait long enough.
Thanks mate

brown nose.

**Bass** · 21st November 2008, 14:10

Originally Posted by slofox

Does the grip vary with temperature and if so, how so?

Mate, there's an old riddle that claims that the difference between pink and purple is the grip.
So yeah, if she's hot................

**Bass** · 21st November 2008, 14:12

Originally Posted by Big Dave

brown nose.

Brown arms

**Forest** · 21st November 2008, 14:56

Originally Posted by slofox

So much for grip in wet or dry conditions.
Next question: Does the grip vary with temperature and if so, how so?

Over to you Forest.........

I am not an expert. But from what I've read, the temperature of the air/tyre/road-surface all combine to affect the level of surface grip.

Generally speaking, rubber softens as it warms up and this increases the level of grip.

However at some point (depending on which materials were used to build the road surface) the bitumen will start to liquefy and the grip will start to decrease.