7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
1,计算试配强度:7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
fm,o=f2+0.645δ=7.5×1.18×0.645=8.7Mpa.7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
2,确定水泥用量:7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
1000(fm.o-β)7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
1000(8.7+15.09)7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷ÎQC=7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
=7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
=242kg/m3 7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
α*fce7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
3.03×32.57²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
3,确定水用量:7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î查表确定用水量为260kg/m3 7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
4,确定砂的用量:7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î用砂在干燥状态下的堆积密度值1480 kg/m3 作为砂的用量.7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
7²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î
所以基准配合比确定为:水泥:砂:水=295:1480:2607²!uh³ÒÛZbbs.3c3t.com¿jDQá÷Î