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首页> 外文期刊>Cement and Concrete Research >Efficiency of mineral admixtures in mortars: Quantification of the physical and chemical effects of fine admixtures in relation with compressive strength
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Efficiency of mineral admixtures in mortars: Quantification of the physical and chemical effects of fine admixtures in relation with compressive strength

机译：砂浆中矿物掺合料的效率：与抗压强度有关的精细掺合料的物理和化学作用的量化

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摘要

This work is the fourth part of an overall project the aim of which was the development of general mix design rales for concrete containing different kinds of mineral admixtures. The two first parts presented the separation and quantification, by means of an empirical model based on semi-adiabatic calorimetry measurements, of the different physical effects responsible for-changes in cement hydration (short terms) when chemically inert quartz powders were used in mortars. Part three dealt with an intensive experimental program, presenting and commenting more than 2000 compressive strength measurements. This program concerned 1 day to 6 months old mortars containing up to 75 percent of inert and pozzolanic admixtures. All these compressive strength results are analyzed in this fourth part and the influence of three effects, namely dilution, heterogeneous nucleation and the pozzolanic effect, are discriminated and quantitatively evaluated. An efficiency concept is proposed in order to take into account the effect of mineral admixture in mortars from both the physical and chemical points of view. It uses an efficiency function xi (p) that has notable properties: it is independent of time, independent of fineness and independent of the type of mineral admixture.
机译：这项工作是整个项目的第四部分，其目的是为包含不同种类矿物掺合料的混凝土开发通用混合设计规则。前两个部分通过基于半绝热量热法的经验模型，对在砂浆中使用化学惰性石英粉时，水泥水化变化（短期）变化的不同物理效应进行了分离和量化。第三部分处理了一个密集的实验程序，提出并评论了2000多个抗压强度测量值。该计划涉及1天至6个月大的砂浆，其中含有多达75％的惰性和火山灰掺合物。在第四部分中分析了所有这些抗压强度结果，并区分和定量评估了三种效应的影响，即稀释，异质成核和火山灰效应。提出了一种效率概念，以便从物理和化学角度考虑砂浆中矿物掺合料的影响。它使用具有显着特性的效率函数xi（p）：它与时间无关，与细度无关，并且与矿物掺合料的类型无关。

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