Question

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3.3. Amount of superplasticizer required for consistency improvement
The amount of superplasticizer required to restore the initial slump of each concrete mix at the end of each agitating period is illustrated in Fig. 3. As seen from Fig. 1, the slump loss of each concrete mix increases as the mixing time is elapsed. Therefore, it is quite straightforward that, even with different quantities, an increased
amount of super plasticizer is required for restoring the initial slump of each concrete mix. Based on this illustration, the quantities of super plasticizer required for restoring the initial slumps of concrete mixes with no mineral additive, 25 kg of fly
ash replaced and 10% silica fume added is relatively greater than those needed for concrete mixes of 20% and 30% fly ash added. For instance, the amount of superplasticizer required for consistency improvement of concrete mix of 25 kg of fly ash replaced at the end of 60 min of agitation is about three times the amount
required for concrete mix of 30% fly ash added. In other words, adding higher amount of fly ash to the concrete mix necessitates lesser amount of superplasticizer to restore the initial slump of the mix compared to mixes without mineral additive, with 7% fly ash replaced and 10% silica fume added. The amount of superplasticizer
used for restoring the initial slump of concrete mix of 10% silica fume added up to an agitating period of 60 min is almost the same amount as used for concrete mix with no mineral additive and for concrete of 25 kg of fly ash replaced. This might be attributed to the quick depletion of the mixing water in fresh concrete
due to hydration as greater amount of silica fume participated in
the reaction in unit time since the specific surface area of the silica
fume is relatively large [20]. At the end of 90 min of agitating, however,
the amount of superplasticizer needed for restoring the initial
slump of concrete mix of 10% silica fume added is lesser than the
amount of superplasticizer needed for concretes with no mineral
additive and with 25 kg fly ash replaced (7% fly ash replacement).
This clearly indicates that incorporating silica fume in concrete mix
is beneficial in relation with slump retention particularly when long delivery times are into consideration. It can also be seen from the same graph that as the amount of fly ash addition to the concrete increases the slump retention increases as well.

Answer 1

3.3。数量的高效减水剂要求的一致性的改进

高效减水剂的数量须恢复最初的衰退各项具体结合在一起的的两端各时期鼓动了图3。从图1看到坍落度、混合各种具体的损失随着混合时间发挥作用。因此,它很简单,即使不同数量,一个增加

数量的超级增塑剂,是需要恢复最初的衰退的每一个具体的组合。在此基础上说明,数量为恢复超级增塑剂要求初始下降的混凝土混合没有矿产添加剂,25公斤的飞

硅灰了,加10%相对比那些需要的混凝土和20%,30%粉煤灰补充说。例如,高效减水剂的数量需要提高混凝土的混合一致性粉煤灰25公斤取代60分钟的结束风潮是大约三倍的数量

混凝土结构需要30%粉煤灰补充说。换句话说,增加数量的粉煤灰混凝土掺量较小混合需要恢复最初的衰退和混合气体的相比,没有矿产添加剂、粉煤灰的7%和10%的硅取代补充道。高效减水剂的数量

用于恢复最初的衰退的混凝土混合10%硅灰加起来一个鼓动段60分钟几乎都是相同的金额用于混凝土混合没有矿产添加剂和具体的25公斤的粉煤灰更换。这可能是由于拌制水快速损耗的新鲜混凝土

由于水化大数量的硅灰的参与

反应在单位时间自比表面积的二氧化硅

熏的影响比较大[20]。最后90分钟,然而,第四天,

高效减水剂的数量需要恢复的字母

混凝土坍落度的混合加10%硅小于

所需金额石粉掺高效减水剂没有矿物质

添加剂和25公斤粉煤灰更换(7%粉煤灰置换)。

这表明在混凝土集硅组合

比较有利于关系保留特别是当长暴跌交货期是考虑进去。它也可以看到同样的图,当在一定数量的粉煤灰常献的混凝土坍落度增加保留增加

Answer 2

数量的高效减水剂要求的一致性的改进