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【简答题】
某混凝土经试拌调整后,得配合比为1:2.20:4.40,W/C=0.6,已知ρc=3.10g/cm 3 , ρ′s=2.60g/cm 3 ,ρ′g=2.65g/cm 3 。求1m 3 混凝土各材料用量。 2混凝土计算配合比为1:2.13:4.31,W/C=0.58,在试拌调整时,增加10%的水泥浆用量。求(1)该混凝土的基准配合比;(2)若已知以基准配合比配制的混凝土水泥用量为320kg,求1m 3 混凝土中其它材料用量 3水泥标号为425号,其富余系数为1.13。石子采用碎石,其材料系数A=0.46,B=0.07。试计算配制C25混凝土 的水灰比。(σ=5.0Mpa) 4己确定混凝土的初步配合比,取15升进行试配。水泥为4.6Kg,砂为9.9Kg,19Kg,2.7Kg,经测定和易性合格。此时实测的混凝土体积密度为2450Kg/m 3 ,试计算该混凝土的配合比(即基准配合比)
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