2、用32.5等级矿渣硅酸盐水泥配制碎石混凝土,灌制100×100×100mm立方体试件三块,在标准条件下养护7天,

2025-03-15 05:41:00
推荐回答(3个)
回答1:

这个问题好像很难回答,缺少必要的条件。
1)由7d强度估算28d强度,需要回归好的公式。
2)水灰比计算,还需要水泥28d强度、混凝土强度等级。

试着推一下:
7d强度为13.3MPa,如按照60%左右的比例,推断28d强度为13.3/60%=22.1MPa.
水泥强度按1.13*32.5=36.7MPa。计算水灰比W/C=(0.47*36.7)/(22.1+0.47*0.07*36.7)=0.73

回答2:

试块的强度和你的水灰比和后来试块所养护的环境有关,水灰比理论上是固定的,但是实际上不一样,不同的水泥需水不一样,导致水灰比也会不一样,这要你做完水泥的需水比,如果使用减水剂,你还得计算出减水剂的减水率,这样才能测出对应的水泥的水灰比,在养护室,要保证湿度和温度,有条件的话,使用蒸汽养护,这对强度也有影响,而且影响不小,另外你用的原材料:石子对强度影响也不小,对石子的压碎值也要测定,这样才能全方面保证试块强度,但是也不能过超太多

回答3:

1、强度应该可以超过20,不太容易达到25
2、要看你是用泵送还是现浇了,一般水胶比在0.5左右
经验,感觉,以实际为准

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