n
第i组混凝
土的抗压强
度Mpa(Ri)
同批n组试件
强度的平均值
mfcu
Ri 2 ∑Ri 2 Rn2 δ fcu ,K
混凝土试块强度评定(公
870.2529.5
84129
864.3629.4
858.4929.3
852.6429.2
864.3629.4
823.6928.7
817.9628.6
795.2428.2
72927
723.6126.9
772.8427.8
84129
806.5628.4
823.6928.7
817.9628.6
806.5628.4
852.6429.2
894.0129.9
0.861718132 2043
876.16
25.7
29.6
660.49 34594.0928.35116279 803.7884316 1.6
0
712.8926.7
812.2528.5
800.8928.3
817.9628.6
756.2