In cement suspensions, a part of the superplasticizers measured as adsorbed by solution depletion, is actually consumed uselessly by intercalation, coprecipitation, micellization and/or modification of early hydrate surface area. This amount is often referred to as lost, as it is not effective as a dispersant. Despite extensive research on the subject, mechanisms responsible for this remain unclear. With a focus on polycarboxylate superplasticizers (PCEs) and Ordinary Portland cement (OPC)-limestone blended cements, this paper proposes a “direct and delayed dosing (D3)” method to shed new light onto this age-old question. Thereby, the amounts of lost PCE are shown to be proportional to the amount of PCE included in the mixing water and to result directly from an increase in specific surface area.

中文翻译：

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D3 方法：直接和延迟给药：对超增塑剂比表面积改性的新见解


在水泥悬浮液中，通过溶液消耗而吸附的一部分超增塑剂实际上被插层、共沉淀、胶束化和/或早期水合物表面积的改性而无用地消耗。这个量通常被称为损失量，因为它作为分散剂是无效的。尽管对此主题进行了广泛的研究，但造成这一现象的机制仍不清楚。本文重点关注聚羧酸减水剂（PCE）和普通波特兰水泥（OPC）-石灰石混合水泥，提出了一种“直接和延迟配料（D3）”方法，为解决这个古老的问题提供新的思路。因此，PCE 的损失量与混合水中所含的 PCE 量成正比，并且直接由比表面积的增加导致。