7.4x0.9-6.66;7.4x1.1-8.14,
抗折强度值均在(6.66~8.14)MPa范围内,故抗折强度取值为7.4MPa
抗压强度:
试件1:66.30x1000/(40x40)=41.4MPa
试件2:77.80x1000/(40x40)=48.6MPa,
试件3:76.98x1000/(40x40)=48.1MPa,
试件4:80.02x1000/(40x40)=50.0MPa
试件5:78.56x1000/(40x40)=49.1MPa
试件6:81.21x1000/(40x40)=50.8MPa
(41.4+48.6+48.1+50.0+49.1+50.8)/6=48.0MPa
;48.0x0.9=43.2,48.0x1.1=52.8,
试件抗压强度值41.4MPa不在(43.2-528)MPa范围内
故抗压强度均值为(48.6+48.1+500+49.1+508)/5=49.3MPa
标准P·042.5水泥28d抗折强度为7.4MPa>65MPa,49.3MPa>425MPa,故强度值合格;
(4)根据GB175-2007《通用硅酸盐水泥》该水泥化学指标、凝结时间、安定性和强度均合格可判定为该水泥为合格品。