98普考土木施工第二大題第二小題 - 土木

※ 引述《AlexChen (試煉石)》之銘言：
: 版上前輩們您好！
: 後學(百思不解)低想要詢問【98普考土木施工第二大題第二小題】該如何計算呢？
: 麻煩不吝嗇告知，謝謝！
: http://farm7.static.flickr.com/6092/6239699529_df5f1fa948_b.jpg

以下為小弟的解題過程，不知道是否正確？麻煩版上前輩們不吝嗇檢核，謝謝！

＊水單位重 = 1g/cm^3 = 1t/m^3

(1) 粗骨材
0.264 = 粗骨材單位重Ws / 0.001
Ws = 0.00264 kg/cm^3………………………Ans
ws = 21.7-5.2 = 16.5kg
Ws = ws / Vs
Vs = 16.5 / 0.00264 = 6250cm^3
V = (π/ 4 )*[(24.1)^2]*22 = 10035.68cm^3
孔隙Vv = 10035.68 – 6250 = 3785.68cm^3
孔隙比e = Vv / Vs = 3785.68 / 6250 = 0.6057………………...Ans

(2) 細骨材
0.262 = 細骨材單位重Ws / 0.001
Ws = 0.00262 kg/cm^3………………………Ans
ws = 8.1-2.4 = 5.7kg
Ws = ws / Vs
Vs = 5.7 / 0.00262 = 2175.57cm^3
V = (π/ 4 )*[(15.9)^2]*15.4 = 3057.77cm^3
孔隙Vv = 3057.77 – 2175.57 = 882.2cm^3
孔隙比e = Vv / Vs = 882.2 / 2175.57 = 0.4055………………...Ans

(2) 粗細混合骨材
0.263 = 粗細混合骨材單位重Ws / 0.001
Ws = 0.00263 kg/cm^3………………………Ans
ws = 24.5-5.2 = 19.3kg
Ws = ws / Vs
Vs = 19.3 / 0.00263 = 7338.403cm^3
V = (π/ 4 )*[(24.1)^2]*22 = 10035.68cm^3
孔隙Vv = 10035.68 – 7338.403 = 2697.277cm^3
孔隙比e = Vv / Vs = 2697.277 / 7338.403 = 0.3676………………...Ans

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