New insights on the basic creep mechanism of one-part alkali activated slag and fly ash paste

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2024-10-08 DOI:10.1016/j.cemconres.2024.107691

Han Gao , Igor Shikhov , Ehab Hamed , Ailar Hajimohammadi , Iman Al-Damad , Christoph Arns , Stephen J. Foster

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Abstract

In this paper, basic creep mechanism of ambient cured one-part alkali activated slag-fly ash (AASF) paste is examined at the microscopic level. A special mini creep rig is constructed enabling in-situ monitoring of water redistribution over time between high- and low-density (HD, LD) gel pores within the loaded paste specimens using ¹H NMR relaxometry. The results suggest that the contraction of C-(N)-A-S-H particles is accompanied by the reduction of water content in HD gel for loaded AASF paste. In contrast, in the loaded OPC paste a noticeable decrease of water residing in LD rather than HD C-S-H gel was observed, implying the presence of a distinct creep mechanism. In addition to the different water environment, the more crosslinked bonding structure of AASF could partially account for its lower creep response supported by ²⁹Si NMR measurement. The findings of this study provide evidence in understanding underlying basic creep mechanism of AASF.

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关于单组分碱激活炉渣和粉煤灰浆基本蠕变机理的新见解

本文从微观层面研究了常温固化单组分碱活性矿渣飞灰（AASF）浆料的基本蠕变机理。利用 1H NMR 驰豫测定法，构建了一个特殊的微型蠕变装置，可对加载浆糊试样中高密度和低密度（HD、LD）凝胶孔之间的水分随时间的重新分布进行原位监测。结果表明，在加载 AASF 浆料的高密度凝胶中，C-(N)-A-S-H 颗粒的收缩伴随着水分含量的减少。与此相反，在负载的 OPC 胶浆中，观察到 LD 而不是 HD C-S-H 凝胶中的水分含量明显减少，这意味着存在一种独特的蠕变机制。除了不同的水环境外，AASF 的交联键合结构也可能是其蠕变响应较低的部分原因，29Si NMR 测量证明了这一点。这项研究结果为了解 AASF 的基本蠕变机制提供了证据。

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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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.