<div dir="ltr">excellent deduction--Thanks!<div><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><font size="2"><font size="2"><span style="color:rgb(102,0,0)">Alan Abrams</span></font><b style="color:rgb(102,0,0)"><br></b><i><span style="color:rgb(102,102,102)">certified professional building designer, AIBD<br>certified passive house consultant, PHIUS</span></i></font><div><i><span style="color:rgb(102,102,102)">certified passive house builder, PHIUS</span></i><font size="2"><span style="color:rgb(102,0,0)"><font color="#666666"><i><br></i></font></span></font><font style="color:rgb(102,102,102)" size="1"><font size="2">cell </font></font><font style="color:rgb(102,102,102)" size="1"><font size="2">202-437-8583</font></font><font style="color:rgb(102,102,102)" size="1"><font size="2"><br>
<a style="color:rgb(102,102,102)" href="mailto:alan@abramsdesignbuild.com" target="_blank">alan@abramsdesignbuild.com</a><br style="color:rgb(102,102,102)"></font></font><a href="http://www.heliconworks.com/index2.html" target="_blank">HELICON WORKS <i>Achitecture and Education</i></a></div></div></div></div>
<br><div class="gmail_quote">On Mon, Dec 7, 2015 at 11:05 AM, Norbert Senf <span dir="ltr"><<a href="mailto:norbert.senf@gmail.com" target="_blank">norbert.senf@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div><div><div>Google says specific heat of concrete is approx 0.8 kJ/kg-K<br></div>1 MJ = 1000 kJ<br></div>Density of concrete = 2300 kg/m3<br><br></div>This gives you a specific heat of 0.8 x 1000/2300 = 0.35 MJ/m3-K<br><br></div>A normal concrete mix = 1:2:3 cement:sand:gravel.<br></div>The sand fills the voids in the gravel. Therefore, for concrete with 40% voids (ie., for gravel), the specific heat would be .14 MJ/m3-K<br><br></div>Norbert<br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Mon, Dec 7, 2015 at 10:06 AM, Alan Abrams <span dir="ltr"><<a href="mailto:alan@abramsdesignbuild.com" target="_blank">alan@abramsdesignbuild.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr"><div>a recent project required a lot of fill under an insulated slab. washed crushed bluestone (aka #57's) was used for the fill, at an average depth of 24"</div><div><br></div><div>any advice on how to calculate the following:<br><br>R-value of the crushed stone</div><div>Heat capacity " " " , expressed as MJ(m^3K)</div><div><br></div><div>?????</div><div><br></div><div>aa</div><span><font color="#888888"><div><br></div><br clear="all"><div><div><div dir="ltr"><font size="2"><font size="2"><span style="color:rgb(102,0,0)">Alan Abrams</span></font><b style="color:rgb(102,0,0)"><br></b><i><span style="color:rgb(102,102,102)">certified professional building designer, AIBD<br>certified passive house consultant, PHIUS</span></i></font><div><i><span style="color:rgb(102,102,102)">certified passive house builder, PHIUS</span></i><font size="2"><span style="color:rgb(102,0,0)"><font color="#666666"><i><br></i></font></span></font><font style="color:rgb(102,102,102)" size="1"><font size="2">cell </font></font><font style="color:rgb(102,102,102)" size="1"><font size="2"><a href="tel:202-437-8583" value="+12024378583" target="_blank">202-437-8583</a></font></font><font style="color:rgb(102,102,102)" size="1"><font size="2"><br>
<a style="color:rgb(102,102,102)" href="mailto:alan@abramsdesignbuild.com" target="_blank">alan@abramsdesignbuild.com</a><br style="color:rgb(102,102,102)"></font></font><a href="http://www.heliconworks.com/index2.html" target="_blank">HELICON WORKS <i>Achitecture and Education</i></a></div></div></div></div>
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