答案:答:抗折:3.83×1.5×1000/40³×100=9.0MPa。3.46×1.5×1000/40³×100=8.1MPa。2.38×1.5×1000/40³×100=5.6MPa。(9.0-7.6)/7.6×100%=18.4%。(5.6-7.6)/7.6×100%=-26.3%均超出10%,所以抗折强度为8.1MPa。抗压:74.56/1.6=46.6MPa(38.2-43.8)/43.8×100%=-12.8%。75.09/1.6=46.9MPa(40.0-44.9)/44.9×100%=-10.9%。61.13/1.6=38.2MPa超出10%,所以抗压强度无效。75.23/1.6=47.0MPa。70.29/1.6=43.9MPa。64.02/1.6=40.0M
答案:答:抗折:3.83×1.5×1000/40³×100=9.0MPa。3.46×1.5×1000/40³×100=8.1MPa。2.38×1.5×1000/40³×100=5.6MPa。(9.0-7.6)/7.6×100%=18.4%。(5.6-7.6)/7.6×100%=-26.3%均超出10%,所以抗折强度为8.1MPa。抗压:74.56/1.6=46.6MPa(38.2-43.8)/43.8×100%=-12.8%。75.09/1.6=46.9MPa(40.0-44.9)/44.9×100%=-10.9%。61.13/1.6=38.2MPa超出10%,所以抗压强度无效。75.23/1.6=47.0MPa。70.29/1.6=43.9MPa。64.02/1.6=40.0M
A. 净浆装入雷氏夹后应在养护箱内养护24h±3h
B. 试件需要进行沸煮
C. 沸煮时间为180min±5min
D. 沸煮时指针向下
A. 正确
B. 错误
解析:解析:<10%差值±0.5;10%~40%差值±1;>40%差值±2
A. 正确
B. 错误
A. 24
B. 48
C. 72
D. 168