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早期推定混凝土强度试验方法 JGJ15--83Q-DKó5obbs.3c3t.comMBƦ#Ès
其中Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 剩余标准差(S*): Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 2.按换算系数方法建立混凝土强度关系式Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès R^=KBjQ-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 其中Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 关系式的标准差(S):Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 附录二 早期推定混凝土强度的示例Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 例1Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 某预制构件厂用相同的原材料生产300号和400号混凝土。采用热水法测定加速养护强度,据此推定标准养护28天强度。Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 1.混凝土强度关系式的建立Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 采用与生产相同的原材料,选择五种水灰比:0.40、0.45、0.50、0.55及0.60。每种重复六次,共30个试样,每一试样成型二组试件,试Q-DKó5obbs.3c3t.comMBƦ#Ès 验结果列于下表:Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 附表1Q-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 为便于计算,列表如下:Q-DKó5obbs.3c3t.comMBƦ#Ès 附表2Q-DKó5obbs.3c3t.comMBƦ#Ès 按附录一公式计算: Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès A=434.5-1.354×217.6=139.9Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 得混凝土强度关系式为:Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès R^28=139.9+1.354RjQ-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 此关系式的相关系数r和剩余标准差按附录一公式计算:Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès r=0.9483>0.85Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 因此,所建立的强度关系式可用于推定标准养护28天混凝土强度。Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 2.混凝土强度的推定Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 混凝土试样用热水法测得加速养护强度Rj=150公斤/厘,根据建立的强度关系式,推定标准养护28天的混凝土强度:Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès R^=139.9+1.354Rj=139.9+1.354×150=343公斤/厘Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 例2Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 某商品混凝土厂用同品种、同标号水泥生产300号混凝土。采用热水法测定加速养护强度,据此推定标准养护28天强度。由于生产单一标Q-DKó5obbs.3c3t.comMBƦ#Ès 号的混凝土,可用换算系数方法建立关系式推定混凝土强度Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 1.按换算系数方法建立强度关系式Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 用相同原材料,配制300号混凝土,制作12个试样。Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 试验结果如下表: Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 附表3Q-DKó5obbs.3c3t.comMBƦ#Ès 按附录一公式计算:Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 得强度关系式为:Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès R^28=2.228RjQ-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 为了便于计算,列表如下:Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 附表4Q-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 按附录一公式计算:Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès =23.63公斤/厘Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 因此,所建立的关系式可用于推定标准养护28天混凝土强度。Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 2.混凝土强度的推定Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 试样用热水法测得的加速养护强度Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès Rj=156公斤/厘Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès 根据建立的强度关系式,推定标准养护28天的混凝土强度:Q-DKó5obbs.3c3t.comMBƦ#ÈsQ-DKó5obbs.3c3t.comMBƦ#Ès R^28=2.228Rj=2.228×156=347.6公斤/厘 Q-DKó5obbs.3c3t.comMBƦ#Ès