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Zadanie projektowe z technologii betonu |
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Wykona³: Marek Hoffmann |
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Dane: |
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Cement CP 35 |
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mc= |
340 |
kg/m3 |
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TC= |
4 |
0C |
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mk= |
1467 |
kg/m3 |
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TK= |
5 |
0C |
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mw= |
259 |
kg/m3 |
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TW= |
3 |
0C |
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wk'= |
0,09 |
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I metoda: |
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Wilgotność kruszywa wk' = 0,05 |
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wk'=0,09 |
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Wk=mk*wk'*(1+wk') = |
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1467*0,09*(1+0,09)= |
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143,91 |
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Ilość wody zarobowej |
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Wz=mw - wk = 259,00 - 143,91 = |
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115,09 |
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Temperatura mieszanki betonowej |
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4,52 |
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Wydajność pompy Q=15 m3/h |
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Q= |
15,00 |
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Powierzchnia deskowania F= |
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5,00 |
m2 |
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Prędkość betonowania Vb =Q/F= |
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3,00 |
m/h |
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P'max wynosi wg nomogramu |
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135,00 |
kN/m2 |
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Współczynnik korekcyjny m= |
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1,09 |
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P= |
10,00 |
kN/m2 |
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P''max=P'max*m+P |
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P''max= |
157,15 |
kN/m2 |
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Głębokość na której występuje max parcie mieszanki betonowej |
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hm=P''max/(r*g) |
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2,38 |
t/m3 |
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hm= |
6,73 |
g= |
9,81 |
m/s2 |
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hm=6,73 m |
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tW=t*aw*at |
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t-początek wiązania mieszanki bet. w godz = |
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2 |
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aw- wsp. zal od stosunku w/c w/c=0,5 aw= |
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1,30 |
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at - wsp. zal od Tmb Tmb=4,52 at= |
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2,35 |
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tw= |
6,11 |
godz. |
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t1= |
0,17 |
godz |
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Wysokość deskowania h=(Q/V)*(tw-t1) |
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h= |
29,72 |
m |
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II metoda |
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Vb= |
3,00 |
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23,35 |
kN/m3 |
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Współczynnik poprawkowy zależny od składu mieszanki betonowej |
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mC= |
340,00 |
P=40% --punkt piaskowy= |
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0,40 |
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mK= |
1467,00 |
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- ilość piasku w kruszywie mp=mK*0,4 |
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mp= |
586,80 |
kg/m3 |
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- ilość żwiru w kruszywie mz=mK - mp |
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mz= |
880,20 |
kg/m3 |
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Wyznaczenie współczynników h1 ,h2 ,h3 |
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c:p:z=1:1:2 |
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1,40 |
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0,90 |
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Tmb=4,52 |
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1,27 |
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23,35 |
kN/m3 |
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Parcie mieszanki betonowej |
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Pmax = 1,62*gb*(gb)^0,333*h1*h2*h3 |
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Pmax= |
172,81 |
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hdesk = |
29,72 |
patrz metoda I |
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Głębokość na której występuje max parcie |
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hm= |
1,62*(Vb^0,3333) |
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Vb= |
3,00 |
patrz metoda I |
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hm= |
2,34 |
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-2,04 |
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