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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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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成熟渣基CEM II混凝土中水合物的基本蠕变特性：微观力学分析

随着建筑行业转向生态高效材料，对渣基CEM II混凝土的准确表征的需求变得越来越重要。在这里，渣基CEM II混凝土的基本蠕变行为可以追溯到混合物不变的水合物特性。因此，实验验证的CEM I/ opc混凝土的三步微粘弹性模型与CEM II的power - acker型水化模型相补充，并扩展到长期蠕变，温度活化和水分敏感性。该模型用于基于应变率的老化粘弹性分析，对两种不同的CEM II混凝土进行蠕变试验；CEMⅱ水合物的剪切蠕变模量是普通硅酸盐水泥水合物的一半。这使得渣基CEM II混凝土特别适用于预制分段隧道衬砌等应用，在位移控制条件下，更快的应力松弛是有益的。

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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.