Basic creep properties of hydrates in mature slag-based CEM II concretes: A micromechanical analysis

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

Cement and Concrete Research Pub Date : 2024-12-05 DOI:10.1016/j.cemconres.2024.107735

Maximilian Sorgner, Rodrigo Díaz Flores, Bernhard Pichler, Thomas Pilgerstorfer, Bernd Moritz, Christian Hellmich

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引用次数: 0

Abstract

The demand for accurate characterization of slag-based CEM II concretes is becoming increasingly important as the construction sector shifts towards eco-efficient materials. Here, the basic creep behavior of slag-based CEM II concretes is traced back to mixture-invariant hydrate properties. Therefore, an experimentally validated three-step micro-viscoelastic model for CEM I/OPC-concretes is complemented by a Powers-Acker-type hydration model for CEM II and extended towards long-term creep, temperature activation, and moisture sensitivity. This model is used for a strain rate-based, aging viscoelastic analysis of two creep tests on distinctively different CEM II concretes; revealing that the shear creep modulus of CEM II hydrates is half as large as the one of ordinary Portland cement hydrates. This makes slag-based CEM II concretes especially suitable for applications such as precast segmental tunnel linings, where a faster stress relaxation under displacement-controlled conditions is beneficial.

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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.