Effect of superabsorbent polymers (SAPs) on rheological properties of fresh cement-based mortars - Development of yield stress and plastic viscosity over time
Effect of superabsorbent polymers (SAPs) on rheological properties of fresh cement-based mortars - Development of yield stress and plastic viscosity over time
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DOI：
10.1016/j.cemconres.2014.07.003
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发表时间：
2015-01-01
影响因子：
11.4
通讯作者：
Schroefl, Christof
中科院分区：
文献类型：
--
作者：
Mechtcherine, Viktor;Secrieru, Egor;Schroefl, Christof
高吸水性聚合物(SAP)是一种新型的、有发展前途的多功能混凝土化学外加剂。本文研究了SAP改性的新鲜水泥基砂浆的流变性。使用了两种不同吸水和解吸动力学的SAP。此外，其中一个等级是不同的。调查了三种参比迫击炮。用连续流动流变仪测试了这些新鲜砂浆90min的流变性。研究发现，SAP样品独特的化学结构决定了其独特的吸水动力学，这是决定新拌砂浆流变性的主要因素。此外，SAP级配对屈服应力和塑性粘度随时间的发展有明显的影响。特定的SAP外加剂对砂浆流变性的特殊影响取决于水胶比、高效减水剂的用量和硅灰的用量(如果存在)。(C)2014爱思唯尔有限公司。保留所有权利。
Superabsorbent polymers (SAPs) are a new, promising, multipurpose chemical admixture for concrete. This article addresses the rheological behaviour of fresh, cement-based mortars modified with SAP. Two types of SAP with differing water absorption and desorption kinetics were used. Additionally, for one the grading was varied. Three reference mortars were investigated. The rheological properties of these fresh mortars were tested for 90 min by continuous flow rheometry. It was found that the distinct kinetics of water uptake inherent in the SAP samples, as governed by their particular chemical structures, is the major factor that governs the rheological properties of fresh mortar. Furthermore, the grading of SAP distinctly affects the development of yield stress and plastic viscosity over time. The particular effects of specific SAP addition on the rheological characteristics of a mortar depend on the water-to-binder ratio, the dosage of superplasticizer, and the dosage of silica fume, if present. (C) 2014 Elsevier Ltd. All rights reserved.