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Author Topic: Physical properties of common building material  (Read 6445 times)

Sigert

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Physical properties of common building material
« on: February 23, 2009, 07:23:50 am »

Hi all,

I'm usually a silent observer, but one can't stay mute forever. I want to assemble a list of common building materials and their densities. But before I get into it, I thought I'd ask if maybe anyone already has such a list.

Second question: would there be other basic physical properties that would be of interest to a designer/acoustician? Properties that can be put into a relatively simple list.
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Thomas Jouanjean

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Re: Physical properties of common building material
« Reply #1 on: February 23, 2009, 09:54:54 am »

Welcome Sigert!

AFAIC, I bought the lists from Labs etc, or I got them included with the softwares (ODEON - Combined industrial and auditorium for ex). For some specific ones, I paid to have private measurements done.

They do tend to get a bit crowded and confusing...

Other interesting infos (when available) are of resilience / elasticity, density, Fire rated or not etc.

Lots of lists are available on the net I think, the problem being that the source is often omitted, which doesn't always make them very solid.



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Thomas Jouanjean
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Sigert

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Re: Physical properties of common building material
« Reply #2 on: February 23, 2009, 11:14:23 am »

I have some time on my hands next week, so in any case I was going to skim the www for relevant data. I want to maximize the return of my effort by knowing what to look for AND by making sure I'm not sucking eggs doing work already done by other forum users.

I contacted a friend at the physics department of Leuven University to help me gather data aswell.

So, thusfar the list of parameters-to-be-listed would be:
-density
-fire rating
-resillience/elasticity
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Sigert

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Re: Physical properties of common building material
« Reply #3 on: February 25, 2009, 08:47:46 am »

How about industry standard dimensions? That one sounds usefull aswell.
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Thomas Jouanjean

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Re: Physical properties of common building material
« Reply #4 on: February 25, 2009, 10:31:31 am »

It will vary with every type of material. And sometimes from one brand to the other.

This is just one of those things you need to deal with while drawing plans and on construction sites. You get to learn all this pretty fast anyway.

No big deal. There is always a solution.

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Thomas Jouanjean
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J.F.Oros

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Re: Physical properties of common building material
« Reply #5 on: February 25, 2009, 11:18:30 am »

Thomas Jouanjean wrote on Mon, 23 February 2009 16:54

[...] I got them included with the softwares (ODEON - Combined industrial and auditorium for ex)[...]

Thomas, if i don't ask too much with this, can u tell me if you use Odeon for small room projects LF prediction (i know its mainly designed for large room acoustics)? Or maybe you use some kind of FEM/BEM software for that ? Thank you!
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Thomas Jouanjean

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Re: Physical properties of common building material
« Reply #6 on: February 25, 2009, 12:37:37 pm »

J.F.Oros wrote on Wed, 25 February 2009 10:18

Thomas, if i don't ask too much with this, can u tell me if you use Odeon for small room projects LF prediction (i know its mainly designed for large room acoustics)? Or maybe you use some kind of FEM/BEM software for that ? Thank you!


Sorry, I don't wish to go into details - but Odeon gets it's fair share of use on almost all projects - it's a good software for many things. But I don't like the way of drawing surfaces in Odeon, and the transfer of CAD files is often a pain.

One thing, I don't design "in the software", I just do certain verifications on the models in the softwares.

Otherwise I use a pen and paper a lot too Smile ... and CAD.
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Thomas Jouanjean
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J.F.Oros

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Re: Physical properties of common building material
« Reply #7 on: February 25, 2009, 01:18:08 pm »

Thank you for answering Thomas. It wasn't my intention to make you enter on details of course (i'm myself a bit of studio designer too and i know that some things we have to keep them under radar Very Happy ), i was mainly trying to find your opinion/experiences on using Odeon for small room acoustics (I only used CATT a little for acoustics modeling).

But I got your point anyway, thank you again and sorry for hijacking the original topic  Smile

PS: pen & paper & CAD are my best friends too  Very Happy
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andrebrito

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Re: Physical properties of common building material
« Reply #8 on: February 25, 2009, 06:13:08 pm »

I think it is more important to use ODEON and other software in tracking rooms or large control roomsc where diffusion plays significant role.

I have only used them once in a small room but I will use it again in a project I'm doing for a small control room
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andrebrito

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Re: Physical properties of common building material
« Reply #9 on: February 26, 2009, 10:14:30 am »

About the initial question...

density, elasticity, maybe an Rw value or R or k if applicable, colour and method of application if particular

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andrebrito

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Re: Physical properties of common building material
« Reply #10 on: February 27, 2009, 04:51:21 pm »

I think placing thermal properties (R or k) is as important as acoustics. In building regulations both are mandatory and go hand in hand.

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Sigert

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Re: Physical properties of common building material
« Reply #11 on: February 27, 2009, 08:13:20 pm »

A quick (latenight) search tells me 'k' stands for Thermal conductivity and 'R' for Thermal resistance.

At first glance they seem totally usefull. Can anyone tell us more on these here factors?
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Thomas Jouanjean

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Re: Physical properties of common building material
« Reply #12 on: February 28, 2009, 06:35:40 am »

They are actually a good indicator of acoustical performance - when you get to know how to read them with that in mind. Not a rule, but a good overall guide.

It's often linked to density / resistance to flow properties.

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Thomas Jouanjean
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Sigert

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Re: Physical properties of common building material
« Reply #13 on: March 02, 2009, 11:52:28 am »

Conductivity and Resistance: sounds like direct opposites of eachother.

What is this Rw value you spoke about, Andre?

So, thusfar the list of parameters-to-be-listed would be:
-density
-fire rating
-resillience/elasticity
-Thermal conductivity
-Thermal resistance
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Thomas Jouanjean

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Re: Physical properties of common building material
« Reply #14 on: March 02, 2009, 12:53:25 pm »

Sigert wrote on Mon, 02 March 2009 10:52

Conductivity and Resistance: sounds like direct opposites of eachother.


http://en.wikipedia.org/wiki/Thermal_conductivity#Thermal_co nductance

Sigert wrote on Mon, 02 March 2009 10:52

 What is this Rw value you spoke about, Andre?


R(w) indicates reduction of aerial sound transmission. It's the difference between two measurements (with and without soundproofing) in a lab.

ΔR(w)= Measurement 1- Measurement 2

R(w)+C indicates measurements done with pink noise to compensate for the human hear sensitivity (see dB(A))
http://ccrma.stanford.edu/~jos/st/DBA_A_Weighted_DB.html

ΔL(w) is the equivalent but for solidian noises. So it's reduction of impact noise. L(n,w).

You can't compare those two directly. You could have a high R(w) with a low L(n,w) and vice versa.
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Thomas Jouanjean
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