Effect of superabsorbent polymers on microstructure and strength of blended cements mortars reinforced by polymeric fibre

CEMENT Pub Date : 2022-09-01 DOI:10.1016/j.cement.2022.100041

Rostami Rohollah , Klemm Agnieszka J． , Fernando C.R. Almeida

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引用次数: 3

Abstract

Superabsorbent polymers (SAPs) efficiently reduce total shrinkage and cracking susceptibility of fibre reinforced mortars (FRM). This paper discusses the effects of SAPs on the microstructure and mechanical properties of FRM containing fly ash (FA) and ground granulated blast-furnace slag (GGBS) during a period of 180 days. Three types of cement including CEM I, CEM II/B-V and CEM III/A and three types of SAP with different chemical compositions and particle gradings were studied. The paper argues SAP's contribution to hydration of FA and GGBS and a subsequent deposition of these products on the fibres surface and in pores below 20 nm diameter. The analysis confirmed that SAPs provide additional water for hydration (internal curing) but also a required space for later hydration products (additional refilling of collapsed SAPs), resulting in more homogenous internal microstructure. This improvement is more prominent in mortars containing finer SAP (around 80 μm), which can facilitate strength recovery of up to 50%. The strength recovering process in FRM-SCM samples is boosted after the 2nd week, and is more dominant for samples containing CEM III/A.

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高吸水性聚合物对聚合物纤维增强水泥砂浆微观结构和强度的影响

高吸水聚合物(sap)能有效降低纤维增强砂浆(FRM)的总收缩率和开裂敏感性。本文研究了在180天的时间里，SAPs对含粉煤灰和磨粒高炉渣的FRM的微观结构和力学性能的影响。研究了CEM I、CEM II/B-V和CEM III/A三种水泥以及不同化学成分和颗粒级配的三种SAP。本文认为SAP对FA和GGBS水化的贡献，以及随后这些产品在纤维表面和直径小于20纳米的孔隙中的沉积。分析证实，SAPs为水化(内部固化)提供了额外的水，但也为后来的水化产物提供了所需的空间(崩塌的SAPs的额外再填充)，从而使内部微观结构更加均匀。这种改善在含有更细SAP(约80 μm)的砂浆中更为突出，可促进强度恢复高达50%。FRM-SCM样品的强度恢复过程在第2周后加快，并且在含有CEM III/A的样品中更占优势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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CEMENT

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