其中5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 剩余标准差(S*): 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 2.按换算系数方法建立混凝土强度关系式5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe R^=KBj5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 其中5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 关系式的标准差(S):5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 附录二 早期推定混凝土强度的示例5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 例15bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 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。5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 1.混凝土强度关系式的建立5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 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5bìè{dIbbs.3c3t.comØCêrçðÛe 验结果列于下表:5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 附表15bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 为便于计算,列表如下:5bìè{dIbbs.3c3t.comØCêrçðÛe 附表25bìè{dIbbs.3c3t.comØCêrçðÛe 按附录一公式计算: 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe A=434.5-1.354×217.6=139.95bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 得混凝土强度关系式为:5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe R^28=139.9+1.354Rj5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 此关系式的相关系数r和剩余标准差按附录一公式计算:5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe r=0.9483>0.855bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 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。5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 2.混凝土强度的推定5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 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:5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe R^=139.9+1.354Rj=139.9+1.354×150=343公斤/厘 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 例25bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 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5bìè{dIbbs.3c3t.comØCêrçðÛe 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5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 1.按换算系数方法建立强度关系式5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 用相同原材料,配制300号混凝土,制作12个试样。5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 试验结果如下表: 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 附表35bìè{dIbbs.3c3t.comØCêrçðÛe 按附录一公式计算:5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 得强度关系式为:5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe R^28=2.228Rj5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 为了便于计算,列表如下:5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 附表45bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 按附录一公式计算:5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe =23.63公斤/厘 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 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。5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 2.混凝土强度的推定5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 试样用热水法测得的加速养护强度5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe Rj=156公斤/厘 5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe 根据建立的强度关系式,推定标准养护28天的混凝土强度:5bìè{dIbbs.3c3t.comØCêrçðÛe 5bìè{dIbbs.3c3t.comØCêrçðÛe R^28=2.228Rj=2.228×156=347.6公斤/厘 5bìè{dIbbs.3c3t.comØCêrçðÛe |